ARTICLE IN PRESS

APPLICATION OF ACTIVATED CARBON IN THE TREATMENT OF PALM OIL MILL EFFLUENT: A COMPREHENSIVE REVIEW

NICKY RAHMANA PUTRA¹*; AHMAD SYAHMI ZAINI²; JUMAKIR JUMAKIR³; WALUYO WALUYO³; SUPARWOTO SUPARWOTO³; MOHAMMAD IRWAN FATKHUR ROZY⁴ and BRAMANTYO AIRLANGGA⁴*
DOI: https://doi.org/10.21894/jopr.2026.0023  |   Published Online: 21 May 2026
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HIGH-YIELD OPTIMISATION OF LIPASE-CATALYSED TRANSESTERIFICATION FOR SUCROSE ESTER PRODUCTION FROM PALM KERNEL OIL METHYL ESTER IN A SOLVENT-FREE SYSTEM

EKA KURNIASIH¹*; RAHMI RAHMI²; DARUSMAN DARUSMAN³* and MUHAMMAD DANI SUPARDAN⁴
DOI: https://doi.org/10.21894/jopr.2026.0022  |   Published Online: 7 May 2026
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GENETIC VARIABILITY OF CAMEROON AND ANGOLA OIL PALM GERMPLASM FOR TROPICAL BREEDING PROGRAMME

HERI ADRIWAN SIREGAR^1,2; REDI ADITAMA2; DINY DINARTI²; WILLY BAYUARDI SUWARNO²; DEWI SUKMA²; EDY SUPRIANTO¹ and SUDARSONO²*
DOI: https://doi.org/10.21894/jopr.2026.0021  |   Published Online: 21 April 2026
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AUTOMATIC OIL PALM TREE COUNTING AND HEIGHT ESTIMATION USING DIRECT GEOREFERENCING PHOTOGRAMMETRY, CANOPY HEIGHT MODELLING, AND TEMPLATE MATCHING

ZAINAL RIO ADITIA¹; NAUFAL SETIAWAN¹* and DEHA AGUS UMARHADI²
DOI: https://doi.org/10.21894/jopr.2026.0020  |   Published Online: 15 April 2026
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EMERGING POLLUTION CONTROL TECHNOLOGIES FOR THE TREATMENT OF PALM OIL MILL EFFLUENT (POME) THROUGH MICROBIAL BIODEGRADATION USING FUNGI: CHALLENGES AND FUTURE PERSPECTIVES

MUZZAMMIL MOSZAKIR¹*; NUR SYAMIMI ZAIDI^1,2 and EE LING YONG^1,2
DOI: https://doi.org/10.21894/jopr.2026.0019  |   Published Online: 9 April 2026
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ARTICLE IN PRESS

FEASIBILITY OF CIRCULAR BLADE FOR CUTTING OIL PALM FRONDS

MOHD KHAIRUL FADZLY MD RADZI¹*; MOHD IKRAM RAMLI²; SANJAAV SOMASUNDARAM²; NISHATA ROYAN RAJENDRAN ROYAN²; MEOR AHMAD FARIS MEOR TAJUDIN³; NUR SAIFUL AZMI NOR AZHAR¹; MOHD IKMAL HAFIZI AZAMAN¹; AMINULRASHID MOHAMED¹; MOHD RAMDHAN MOHD KHALID¹ and MOHD AZWAN MOHD BAKRI¹
DOI: https://doi.org/10.21894/jopr.2026.0018  |   Published Online: 2 April 2026
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ARTICLE IN PRESS

UNLOCKING THE POTENTIAL OF POME AS SOIL AMENDMENT TO ENHANCE GROWTH AND YIELD PERFORMANCE OF MAIZE CULTIVATED ON BRIS SOIL

NOORSUHAILA, A B¹*; ILLANI ZURAIHAH, I²; NOOR HASLIZAWATI, A B²; MUHAMMAD ZAMIR, A R²; FARIDAH, M²; THEEBA, M²; NOR HAZLINA, M S³; FARAH HUDA, S S³; TAUFIKURAHMAN, B⁴ and MOHD HADI AKBAR, B⁵
DOI: https://doi.org/10.21894/jopr.2026.0017  |   Published Online: 10 March 2026
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OIL PALM LEAF DAMAGE CLASSIFICATION USING HYPERPARAMETER TUNING OF XCEPTION MODEL

DWIKA KARIMA WARDANI¹*; MUHATHIR²; MAHARDIKA ABDI PRAWIRA TANJUNG³; MUHAMMAD HARIS³ and VITRI RENNY TRIYANTI⁴
DOI: https://doi.org/10.21894/jopr.2026.0016  |   Published Online: 26 February 2026
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COMPARATIVE ANALYSIS OF OIL PALM LEAF EXTRACTS AND VITAMIN C ON OSTEOBLASTIC ACTIVITY AND MINERALISATION IN MC3T3-E1 CELLS AS POTENTIAL ANTI-OSTEOPOROTIC AGENTS

PARASTOO SAFA¹*; PATIMAH ISMAIL²; SABARIAH MD NOOR³ and NIZAR ABD MANAN¹*
DOI: https://doi.org/10.21894/jopr.2026.0015  |   Published Online: 19 February 2026
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ARTICLE IN PRESS

OPTIMISATION OF MULTI-STAGE SILICA-ASSISTED LIQUID-LIQUID EXTRACTION OF PALM STEARIN-BASED EMULSIFIERS AND THEIR PREDICTIVE APPLICATIONS IN FOOD PRODUCTS

GINA LIBRIA NADJAMOEDDIN^1,5*; DIDAH NUR FARIDAH^1,2*; NURI ANDARWULAN^1,2; PURWIYATNO HARIYADI^1,2 and MOHAMMAD KHOTIB^3.4
DOI: https://doi.org/10.21894/jopr.2026.0014  |   Published Online: 13 February 2026
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CONCEPTUAL ALTERNATIVE MILLING FOR 3-MCPD MITIGATION

ANDREW YAP KIAN CHUNG¹*; FATAH YAH ABD. MANAF¹ and ROHAYA MOHAMMED HALIM¹
DOI: https://doi.org/10.21894/jopr.2026.0013  |   Published Online: 13 February 2026
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ARTICLE IN PRESS

SOIL CO₂ FLUX ACROSS MANAGEMENT ZONES IN AN OIL PALM PLANTATION ON PEAT IN PAHANG, MALAYSIA

IZZATI MOHAMAD NOOR¹*; NIK SASHA KHATRINA KHAIRUDDIN¹ and NUR MAISARAH JANTAN¹
DOI: https://doi.org/10.21894/jopr.2026.0012  |   Published Online: 11 February 2026
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VERTICAL DISTRIBUTION OF OIL PALM (Elaeis guineensis) ROOTS IN SOIL AFTER ORGANIC MATTER AMENDMENTS USING BIOPORE INFILTRATION HOLES AND PILE TECHNIQUES

ODIT FERRY KURNIADINATA¹*; JEVON JETHRO MILLARD¹; HADI PRANOTO¹; ELLOK DWI SULICHANTINI¹ and ELIYANI¹
DOI: https://doi.org/10.21894/jopr.2026.0011  |   Published Online: 11 February 2026
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FIRST REPORT OF Diaporthe phaseolorum AND Neopestalotiopsis clavispora CAUSING LEAF SPOT DISEASE ON OIL PALM (Elaeis guineensis)

NUR AIN IZZATI MOHD ZAINUDIN^1,2*; NURÁIN AZHAR¹; NOOR AISYAH MD NOORDIN¹ and HARUNA USMAN BAITA³
DOI: https://doi.org/10.21894/jopr.2026.0010  |   Published Online: 3 February 2026
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ARTICLE IN PRESS

CRITICAL REVIEWS OF 3-MCPDE DETECTION: ADVANCES IN ANALYTICAL TECHNIQUES

MUHAMMAD QAYYUM OTHMAN¹*; MOHD HAFIZ ABU BAKAR²; NUR HIDAYAH AZEMAN³; NADHRATUN NAIIM MOBARAK⁴ and AHMAD ASHRIF A BAKAR^1,3*
DOI: https://doi.org/10.21894/jopr.2026.0009  |   Published Online: 29 January 2026
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ARTICLE IN PRESS

THE WATER FOOTPRINT OF OIL PALM PLANTATION IN THE KAMPAR CATCHMENT, RIAU, INDONESIA

PRIMA WAHYU TITISARI¹*; ELFIS¹; INDRY CHAHYANA² and TIKA PERMATASARI³
DOI: https://doi.org/10.21894/jopr.2026.0008  |   Published Online: 28 January 2026
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ARTICLE IN PRESS

IMPACT OF FROND MOISTURE CONTENT ON CUTTING FORCES IN OIL PALM HARVESTING

UMESH GANESH¹; ZAIDI MOHD RIPIN¹; WAN MOHD AMRI WAN MAMAT ALI¹; AMIRUL AMZAR JA’FAR¹ and MOHAMAD IKHWAN ZAINI RIDZWAN¹*
DOI: https://doi.org/10.21894/jopr.2026.0007  |   Published Online: 26 January 2026
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ARTICLE IN PRESS

ANALYTICAL TECHNIQUES FOR THE DETECTION OF PALM OIL ADMIXTURE – A REVIEW

FARAH KHUWAILAH AHMAD BUSTAMAM^1,2*; MOHD SUKRI HASSAN²; YEOH CHEE BENG¹; SYAZA AZHARI² and NAJWA SULAIMAN¹
DOI: https://doi.org/10.21894/jopr.2026.0006  |   Published Online: 21 January 2026
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ARTICLE IN PRESS

SUSTAINABLE OIL PALM BIOMASS VALORISATION FOR ACTIVATED CARBON: A REVIEW OF INTEGRATED CARBONISATION-ACTIVATION PATHWAYS

NAHRUL HAYAWIN, Z¹*; IBRAHIM, M F²; BIDATTUL SYIRAT, Z³; JENOL, M A⁴; NOORSHAMSIANA, A W¹; NOR FAIZAH, J¹ and NASRIN, A B¹
DOI: https://doi.org/10.21894/jopr.2026.0005  |   Published Online: 19 January 2026
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ARTICLE IN PRESS

IMAGE-SCANNING APPROACH IN MONITORING OIL PALM ROOT PRODUCTION ON PEAT

ELISA RUMPANG¹*; NIK SASHA KHATRINA KHAIRUDDIN¹; TIARA NALES NYAWAI¹; IZZATI MOHAMAD NOOR¹; NUR MAISARAH JANTAN¹; LAW MEI CHING¹; NORLIYANA ZIN ZAWAWI¹ and SIM SIONG FONG²
DOI: https://doi.org/10.21894/jopr.2026.0004  |   Published Online: 13 January 2026
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ARTICLE IN PRESS

INCREASING THE POPULATION OF OIL PALM WEEVIL (Elaeidobius kamerunicus) USING HATCH AND CARRY BOX TECHNIQUE IN OIL PALM CULTIVATION ON TROPICAL PEAT SOIL

MOHD KHAIRIL JAMAHURI^1,3 and MOHD HADI AKBAR BASRI^1,2*
DOI: https://doi.org/10.21894/jopr.2026.0003  |   Published Online: 13 January 2026
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ARTICLE IN PRESS

EFFECT OF ZWIEBACK, A CRISP BREAD CONTAINING RED PALM OIL, ON SERUM ANTIOXIDANT AND INFLAMMATORY BIOMARKERS IN WOMEN WITH BENIGN BREAST TUMOURS

RIMBAWAN RIMBAWAN¹*; SRI ANNA MARLIYATI¹; ANGGA RIZQIAWAN² and KHAERUL FADLY³
DOI: https://doi.org/10.21894/jopr.2026.0002  |   Published Online: 8 January 2026
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ARTICLE IN PRESS

THE IMPACT OF Elaeidobius kamerunicus FAUST POPULATION DENSITY AND SEX RATIO ON OIL PALM FRUIT SET IN INDONESIA

AGUS EKO PRASETYO^1,2*; EDHI MARTONO²; ANDI TRISYONO²; ALAN SOFFAN² and ROCH DESMIER DE CHENON³
DOI: https://doi.org/10.21894/jopr.2026.0001  |   Published Online: 8 January 2026
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ARTICLE IN PRESS

EFFECTS OF DIFFERENT COVER CROPS ON SOIL CO₂ EMISSION UNDER OIL PALM PLANTATION ON TROPICAL PEATLAND

NUR WAKHID¹*; ENI MAFTU’AH²; NURHAYATI³; MASGANTI²; MUHAMMAD NOOR²; YIYI SULAEMAN²; VICCA KAROLINOERITA⁴ and SRI NURYANI HIDAYAH UTAMI⁵
DOI: https://doi.org/10.21894/jopr.2025.0057  |   Published Online: 23 December 2025
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ARTICLE IN PRESS

REGENERATION OF Dura PALM FROM RAMET VIA SOLID AND LIQUID TISSUE CULTURE SYSTEMS

ABANG MASLI DAYANG IZAWATI¹*; NOOR AZMI SHAHARUDDIN^2,3; MEILINA ONG-ABDULLAH¹; JANNA ONG ABDULLAH²; SITI RAHMAH ABDUL RAHMAN¹; GHULAM KADIR AHMAD PARVEEZ¹ and MAT YUNUS ABDUL MASANI¹
DOI: https://doi.org/10.21894/jopr.2025.0056  |   Published Online: 19 December 2025
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ARTICLE IN PRESS

HARNESSING THE ROLE OF EPIGENETICS IN OIL PALM IMPROVEMENT

NORASHIKIN SARPAN¹ and SIEW-ENG OOI¹*
DOI: https://doi.org/10.21894/jopr.2025.0055  |   Published Online: 14 November 2025
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ARTICLE IN PRESS

CALCIUM NUTRITIONAL EFFECTS ON SUPPRESSION OF BASAL STEM ROT (BSR) DISEASE IN OIL PALM SEEDLINGS IN NURSERY AND FIELD TRIALS

NURUL MAYZAITUL AZWA JAMALUDIN¹*; NUR SHUHADA MUHAMAD TAJUDIN² and MOHAMED HANAFI MUSA³
DOI: https://doi.org/10.21894/jopr.2025.0054  |   Published Online: 30 October 2025
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ARTICLE IN PRESS

FIELD EVALUATION OF MORPHOLOGICALLY CHARACTERISED NORMAL AND OFF-TYPE OIL PALM PLANTLETS REGENERATED VIA SOMATIC EMBRYOGENESIS

KARYANTI¹*; DWINITA WIKAN UTAMI²; HAYAT KHAIRIYAH¹; FARIDA ROSANA MIRA³; CATUR SRIHERWANTO⁴; TATI SUKARNIH³; YAYAN RUDIYANA³; ANDI ROCHANDI³; FAJAR PRAKOSO MAWASID⁵ and CAHYO SRI WIBOWO⁵
DOI: https://doi.org/10.21894/jopr.2025.0053  |   Published Online: 29 October 2025
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ARTICLE IN PRESS

THE EFFECTS OF FERMENTATION USING CELLULOLYTIC MICROBES ON PALM OIL FRUIT DETACHMENT AND CHEMICAL PROPERTIES OF CRUDE PALM OIL

ELISA JULIANTI¹*; ZULKIFLI LUBIS¹; HOTNIDA SINAGA¹, SENTOSA GINTING¹, and PRETTY PERONIKA SINAGA¹
DOI: https://doi.org/10.21894/jopr.2025.0052  |   Published Online: 29 October 2025
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ARTICLE IN PRESS

MOLECULAR MARKER SCREENING OF OIL PALM TO IDENTIFY PALMS WITH LOW LIPASE ACTIVITY

CHEAH TEAD WENG¹*; SENG TZER YING¹; NUR HADIRAH SHAMSUDDIN¹; GOH HUA LEK²; CHEW TIONG DAR³; NOOR AZIZAH MD JENAL³ and JOSHUA MATHEWS⁴
DOI: https://doi.org/10.21894/jopr.2025.0051  |   Published Online: 30 September 2025
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ARTICLE IN PRESS

GENETIC VARIATION IN THE STEAROYL-ACYLCARRIER- PROTEIN DESATURASE (SAD) GENE AMONG AFRICAN AND AMERICAN OIL PALM SPECIES AND THEIR HYBRIDS

RISMAYANTI¹*; SUDARSONO²; WAHYU PURBOWASITO³; NADIRMAN HASKA⁴ and ANDI ROCHANDI⁴
DOI: https://doi.org/10.21894/jopr.2025.0050  |   Published Online: 30 September 2025
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ARTICLE IN PRESS

BIOSYNTHESIS OF SILVER NANOPARTICLES USING PALM OIL MILL EFFLUENT (POME) EXTRACT

ABDULRAHMAN SANI ALIERO^1,2; NURLIYANA AHMAD ZAWAWI¹*; NIK AHMAD NIZAM NIK MALEK^1,3; MUHAMMAD HARIZ ASRAF¹; IQBAL JALALULDIN⁴; MOHD FIRDAUS ABDUL WAHAB¹ and MUSTAPHA ISAH¹
DOI: https://doi.org/10.21894/jopr.2025.0049  |   Published Online: 23 September 2025
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ARTICLE IN PRESS

EFFECT OF PHYTOADDITIVE MIXTURE OF Curcuma longa AND Ocimum sanctum WITH OR WITHOUT PALM OIL ON GROWTH, INTESTINAL HEALTH AND ECONOMIC PERFORMANCE OF LOW BODY CONDITION BLACK BENGAL GOATS (BBG)

AMIT KUMAR SINGH¹*; CHAMPAK BHAKAT¹; UPALI KISKU²; TAPAS KUMAR DUTTA³; MUTHUPALANI KARUNAKARAN⁴; AJOY MANDAL⁵ and ASIF MOHAMMAD²
DOI: https://doi.org/10.21894/jopr.2025.0048  |   Published Online: 19 September 2025
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ARTICLE IN PRESS

COMPARISON OF EVAPOTRANSPIRATION OF OIL PALM HYBRID OxG AND Elaeis guineensis Jacq. AT THE NURSERY STAGE

ARLEY ZAPATA-HERNÁNDEZ¹* and NOLVER ARIAS²
DOI: https://doi.org/10.21894/jopr.2025.0047  |   Published Online: 2 September 2025
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ARTICLE IN PRESS

SPRAY COVERAGE AND EFFECTIVENESS OF UNMANNED AERIAL VEHICLE POINT-TOPOINT SPRAYING TECHNOLOGY FOR THE CONTROL OF Oryctes rhinoceros IN IMMATURE OIL PALM

MEOR BADLI SHAH AHMAD RAFIE¹* and SAMSUDIN AMIT¹
DOI: https://doi.org/10.21894/jopr.2025.0046  |   Published Online: 2 September 2025
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ARTICLE IN PRESS

LEGUMINOUS COVER CROPS IN MALAYSIAN OIL PALM FIELDS: THE SPECIES, SEED TECHNOLOGY, FIELD PRACTICES AND FUTURE TRENDS

FUI YING TSAN¹*
DOI: https://doi.org/10.21894/jopr.2025.0045  |   Published Online: 26 August 2025
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ARTICLE IN PRESS

PREDICTION OF OIL PALM YIELD USING MACHINE LEARNING: COMPARISON OF LINEAR AND NON-LINEAR ALGORITHMS WITH MULTIVARIATE TIME SERIES DATA

NUZHAT KHAN^1,2; MOHAMAD ANUAR KAMARUDDIN¹*; USMAN ULLAH SHEIKH²; AB AL-HADI BIN AB RAHMAN² and MUHAMMAD PAEND BAKHT³*
DOI: https://doi.org/10.21894/jopr.2025.0044  |   Published Online: 20 August 2025
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NITROGEN CONCENTRATION, ACCUMULATION, EXPORTATION AND EFFICIENCY IN OIL PALM (Elaeis guineensis Jacq.) GROWN ON OXISOLS OF THE AMAZON

ISMAEL DE JESUS MATOS VIÉGAS¹; JESSIVALDO RODRIGES GALVÃO²*; SONIA MARIA BOTELHO ARAÚJO³; MILTON GARCIA COSTA⁴; ALESSANDRA MARIE OHASHI²; MÁRIO DAVI COUTINHO DOS SANTOS²; ODETE KARINY SOUZA SANTOS² and BRUNO KLEIDSON DA SILVA MAIA⁴
DOI: https://doi.org/10.21894/jopr.2025.0043  |   Published Online: 20 August 2025
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ARTICLE IN PRESS

SSR MARKERS FACILITATE TESTING OF GENETIC PURITY AND PREDICTION OF BIOLOGICAL PARENTS FOR BREEDING CROSSES OF OIL PALM

NORHALIDA MOHAMED SERDARI^1,3*; TING NGOOT-CHIN¹; RAJINDER SINGH¹; KANDHA SRITHARAN²; MARYAM MOHAMED REHAN³; JALANI BIN SUKAIMI³ and MAIZURA ITHNIN¹
DOI: https://doi.org/10.21894/jopr.2025.0042  |   Published Online: 19 August 2025
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PREDICTION OF OIL PALM BUNCHES PRODUCTION USING ARTIFICIAL NEURAL NETWORK

EMANUELLY CANABRAVA MAGALHÃES¹*; CARLOS ALBERTO ARAÚJO JÚNIOR²; HELIO GARCIA LEITE¹; GIANMARCO GOYCOCHEA CASAS¹; JULIANA MACHADO LISBOA³; CARLOS HENRIQUE GARCIA³ AND RODRIGO RABE SALES BICALHO³
DOI: https://doi.org/10.21894/jopr.2025.0041  |   Published Online: 13 August 2025
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CONSERVED TRANSCRIPTIONAL RESPONSES TO SALT AND WATER STRESS IN OIL PALM (Elaeis guineensis Jacq.) LEAF TISSUES

FERNANDA FERREIRA SALGADO¹; THALLITON LUIZ CARVALHO DA SILVA¹; ANDRÉ PEREIRA LEÃO²; ROBERTO COITI TOGAWA³; CARLOS ANTÔNIO FERREIRA DE SOUSA⁴; PRISCILA GRYNBERG³ and MANOEL TEIXEIRA SOUZA JÚNIOR^1,2,*
DOI: https://doi.org/10.21894/jopr.2025.0040  |   Published Online: 11 August 2025
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THE GENETIC INFLUENCE ON OIL PALM PHENOLOGY-RELATED TRAIT INHERITANCE IN CAMEROON ACCESSION

TRININGSIH¹*; SUJADI¹; HERI ADRIWAN SIREGAR¹ and YURNA YENNI¹
DOI: https://doi.org/10.21894/jopr.2025.0039  |   Published Online: 29 July 2025
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LOWERING THE COSTS OF BIO-HYDROGEN PRODUCTION FROM EMPTY FRUIT BUNCH (EFB) WITH SOLAR GASIFICATION – TECHNOECONOMIC AND THERMODYNAMIC ANALYSIS

ZHAO CHEN¹ and ZAIDI MOHD RIPIN¹*
DOI: https://doi.org/10.21894/jopr.2025.0038  |   Published Online: 23 July 2025
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REVIEW ARTICLE
Vol. 38 (2) June 2026, p. 229-249

PARADIGMS AND KNOWLEDGE GAPS IN OIL PALM STEM ROTS CAUSED BY Ganoderma

JULIE FLOOD¹*; PAUL BRIDGE¹ and CARMEL PILOTTI²
DOI: https://doi.org/10.21894/jopr.2025.0020  |   Published Online: 28 March 2025
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ARTICLE IN PRESS

BIOGENIC SILICA FROM OIL PALM BIOMASS: A REVIEW ON THE POTENTIAL, EXTRACTION METHODS AND PROPERTIES

HOERUDIN HOERUDIN¹; TATANG HIDAYAT¹; ATON YULIANTO¹*; SITI AGUSTINA¹; FAJRIYAN¹; KARNADI¹; ABDUL MAJID¹; AHMAD SUHENDRA¹; EDDY SAPTO HARTANTO¹ and ACHMAD KAMIL¹
DOI: https://doi.org/10.21894/jopr.2025.0036  |   Published Online: 22 July 2025
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ARTICLE IN PRESS

MAIN QUALITY PARAMETERS AND DIFFERENT FATS INCORPORATION IN COMMERCIAL PLANT-BASED MEAT ANALOGUES (PBMA): MAPPING THE PATH FOR PBMA FORMULATIONS

HAZRATI WAZIR¹*; NORAZURA AILA MOHD HASSIM¹; TECK-KIM TANG¹; MEI-HUEY SAW¹; NUR HAQIM ISMAIL¹; SOON-SEN LEOW¹ and SIVARUBY KANAGARATNAM¹
DOI: https://doi.org/10.21894/jopr.2025.0035  |   Published Online: 22 July 2025
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ARTICLE IN PRESS

CYTOTOXIC AND ANTI-ACNE ACTIVITY OF SUGAR FATTY ACID ESTERS (SFAE) FROM CPO AND PALM OIL HYDROLYSATE

TUTI WUKIRSARI¹*; ADE ANDRIANI²; OBIE FAROBIE³; SRI HANDAYANI¹ and SUMI HUDIYONO¹
DOI: https://doi.org/10.21894/jopr.2025.0034  |   Published Online: 16 July 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 250-261

ESTIMATING INSECT PEST CONSUMPTION BY THE ORIENTAL MAGPIE-ROBIN AND YELLOW-VENTED BULBUL IN OIL PALM PLANTATIONS FROM A FEEDING EXPERIMENT

MUHAMMAD SYAFIQ YAHYA¹; DZULHELMI MUHAMMAD NASIR²; HELDA TANGINANG³; KAMIL TOHIRAN⁴; AHMAD AFANDI MURDI⁴; SYARI JAMIAN⁵; AHMAD RAZI NORHISHAM¹; ALEX M LECHNER⁶ and BADRUL AZHAR^1,7,8*
DOI: https://doi.org/10.21894/jopr.2025.0017  |   Published Online: 19 March 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 262-271

In Planta EFFICACY OF LOCAL Trichoderma ISOLATES AND SELECTED COMMERCIAL BIOLOGICAL AGENTS AGAINST Ganoderma boninense IN OIL PALM

JUMIATI ASIS¹; NUR AAINAA HASBULLAH¹; MOHAMADU BOYIE JALLOH¹; PALANIVELL PERUMAL^2,3; PETER MOJIUN² and MOHD RASHID MOHD RAKIB¹*
DOI: https://doi.org/10.21894/jopr.2025.0007  |   Published Online: 19 February 2025
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REVIEW ARTICLE
Vol. 37 (2) June 2025, p. 187-208

OIL PALM ECONOMIC PERFORMANCE IN MALAYSIA AND R&D PROGRESS IN 2024

GHULAM KADIR AHMAD PARVEEZ¹*; RAZMAH GHAZALI¹; NUR AIN MOHD HASSAN¹; AHMAD ZAIRUN MADIHAH¹; ABRIZAH OTHMAN¹; PARTHIBAN KANNAN¹; TEH SOEK SIN¹; VOON PHOOI TEE¹; ZAINAB IDRIS¹ and RAMLE MOSLIM¹
DOI: https://doi.org/10.21894/jopr.2025.0031  |   Published Online: 13 June 2025
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ARTICLE IN PRESS

MIXTURE DESIGN OPTIMISATION OF RED PALM OIL IN CANDY: EFFECTS ON HARDNESS AND FRIABILITY

TECK-KIM TANG¹*; NORAZURA AILA MOHD HASSIM¹; SOON-SEN LEOW¹; SIVARUBY KANAGARATNAM¹; RADHIKA LOGANATHAN¹; HAZRATI WAZIR¹; NUR HAQIM ISMAIL¹ and MEI-HUEY SAW¹
DOI: https://doi.org/10.21894/jopr.2025.0030  |   Published Online: 13 June 2025
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POSTPRANDIAL INVESTIGATION ON PLANT AND ANIMAL DERIVED PALMITIC ACID VERSUS OLEIC ACID-RICH HIGH FAT DIETS ON ENDOTHELIAL DYSFUNCTION BIOMARKERS IN HEALTHY MEN: A PILOT STUDY

GOWRI NAGAPAN¹* and TENG KIM-TIU¹
DOI: https://doi.org/10.21894/jopr.2025.0029  |   Published Online: 13 June 2025
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GENETIC PERFORMANCE OF 3-WAY (MPOB-NIGERIA × DELI) Dura × Pisifera OIL PALM CROSSES

NOR AZWANI, A B¹*; ZULKIFLI YAAKUB¹; NORAZIYAH ABD AZIZ SHAMSUDIN²; MARHALIL MARJUNI¹ and FADILA AHMAD MALIKE¹
DOI: https://doi.org/10.21894/jopr.2025.0028  |   Published Online: 5 June 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 272-281

APPLICATION OF OLD OIL PALM TRUNKS AFFECTS THE GROWTH PERFORMANCE OF OIL PALM SEEDLINGS

AYAKA UKE¹*; ALISA HANIS²; KUMAR SUDESH² and AKIHIKO KOSUGI^1,3*
DOI: https://doi.org/10.21894/jopr.2025.0009  |   Published Online: 20 February 2025
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SUSTAINABLE INNOVATIONS IN PALM OIL EXTRACTION: A COMPREHENSIVE OVERVIEW OF GREEN TECHNOLOGIES

NICKY RAHMANA PUTRA¹*; YUSTISIA YUSTISIA²; R. BAMBANG HERYANTO²; NI WAYAN TRISNAWATI³; DAMASUS RIYANTO⁴; NYOMAN NGURAH ARYA⁵ and BRAMANTYO AIRLANGGA⁶*
DOI: https://doi.org/10.21894/jopr.2025.0027  |   Published Online: 5 June 2025
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GENETIC ANALYSIS OF HEIGHT INCREMENT (HINC) IN ELMINA-ULU REMIS OIL PALM USING SNP MARKERS

CHEAH TEAD WENG ¹*; SENG TZER YING¹; GOH HUA LEK² and JOSHUA MARTHEWS³
DOI: https://doi.org/10.21894/jopr.2025.0025  |   Published Online: 17 April 2025
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PERFORMANCE OF B11/B20 USAGE IN HEAVY-DUTY GAS VEHICLES

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OPTIMISATION OF BOMBARDMENT PARAMETERS IN OIL PALM EMBRYOGENIC CALLI BASED ON TRANSIENT EXPRESSION OF RFP GENE

A RAHMAN NURFAHISZA¹*; MAT YUNUS ABDUL MASANI¹*; SUBHI SITI MASURA¹; MD PIJI MOHD AL AKMARUL FIZREE¹; OMAR ABD RASID¹ and GHULAM KADIR AHMAD PARVEEZ¹
DOI: https://doi.org/10.21894/jopr.2025.0024  |   Published Online: 11 April 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 282-295

SOIL CHARACTERISTICS INFLUENCE THE DISTRIBUTION OF BORON FRACTIONS IN SOILS OF OIL PALM PLANTATIONS

PREMALATHA, R P¹*; MANORAMA, K¹; SURESH, K¹ and RAMACHANDRUDU, K¹
DOI: https://doi.org/10.21894/jopr.2025.0016  |   Published Online: 19 March 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 296-306

TRUE-TO-TYPE VERSION 2 – HIGH RESOLUTION GENOTYPING PLATFORM FOR PARENTAL IDENTIFICATION IN OIL PALM

TING NGOOT-CHIN¹; LESLIE LOW ENG-TI¹; JAAP BUNTJER²; MEILINA ONG-ABDULLAH¹; CHAN PEK-LAN¹; ZULKIFLI YAAKUB¹; JARED ORDWAY² and RAJINDER SINGH¹*
DOI: https://doi.org/10.21894/jopr.2025.0018  |   Published Online: 25 March 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 307-315

IMPROVING OIL PALM BREEDING EFFICIENCY VIA MIXED POLLINATION AND PATERNITY DETERMINATION USING SINGLE NUCLEOTIDE POLYMORPHISM (SNP) PANEL

ZULKIFLI YAAKUB¹*; SUZANA MUSTAFFA¹; MARHALIL MARJUNI¹; FATIN MOHD NASIR¹; WAN NOR SALMIAH TUN MOHD SALIM¹; TING NGOOT CHIN¹; JAAP BUNTJER²; JARED ORDWAY² and RAJINDER SINGH¹
DOI: https://doi.org/10.21894/jopr.2025.0026  |   Published Online: 18 April 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 316-325

CONSERVATION OF PREDATORY ANTS Myopopone castanea SMITH (HYMENOPTERA: FORMICIDAE) IN AN OIL PALM PLANTATION IN NORTH SUMATERA

MARYANI CYCCU TOBING¹*; LISNAWITA¹ and WIDIHASTUTY²*
DOI: https://doi.org/10.21894/jopr.2025.0021  |   Published Online: 28 March 2025
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REVIEW ARTICLE
Vol. 38 (1) March 2026, p. 1-34

CLIMATE VARIABILITY AND WATER STRESS EFFECTS ON OIL PALM (Elaeis guineensis Jacq.) PRODUCTIVITY IN MALAYSIA

SANI IDRIS^1,2; CHRISTOPHER TEH BOON SUNG¹*; SYAHARUDIN ZAIBON¹ and SIM CHOON CHEAK³
DOI: https://doi.org/10.21894/jopr.2024.0054  |   Published Online: 26 November 2024
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 326-337

STUDY OF THE ANATOMICAL STRUCTURE ALONG THE OIL PALM FRUIT BUNCH STALK AND ITS IMPACT ON CUTTING PRESSURE

AZHAR ARIFF¹; CHONG WU YI¹*; HARITH AHMAD¹; MOHAMMAD FAISAL ISMAIL¹; WAN RUSYDIAH WAN RUSIK²; BATRISYIA AHMAD NAZRI³; AMIRUL AL HAFIZ ABDUL HAMID⁴; HARIKRISHNA KULAVEERASINGAM⁴; MOHAMMAD ZULFAHMI MOHAMMAD YUSOFF⁴ and MOHAMMAD SHIRAZ ARIS⁴
DOI: https://doi.org/10.21894/jopr.2025.0022  |   Published Online: 28 March 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 338-345

CHEMICAL PROPERTIES AND BIOCOMPATIBILITY OF MICROCRYSTALLINE CELLULOSE REINFORCED DENTURE BASE RESIN MATERIAL: AN In Vitro STUDY

JACOB JOHN^1,6*; AMIRA ALI ABDEL RAHAMAN ALI²; SHANI ANN MANI³; ARIEF CAHYANTO^1,7; AEMAN HH ELKEZZA¹; FATIHA ISMAIL⁴ and AIED MOHAMMED ALABASI⁵
DOI: https://doi.org/10.21894/jopr.2025.0023  |   Published Online: 28 March 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 346-361

EVALUATION OF LAMINATED PANELS FROM SEMANTAN BAMBOO AND OIL PALM TRUNKS FOR SUSTAINABLE COMPOSITE MANUFACTURING

BALKIS FATOMER A. BAKAR^1,2*; YAP XIA JIAN¹; NURUL AIDA OTHMAN¹; AISYAH HUMAIRA ALIAS³; ALIA SYAHIRAH YUSOF⁴ and MOHD KHAIRUN ANWAR UYUP⁴
DOI: https://doi.org/10.21894/jopr.2025.0032  |   Published Online: 8 July 2025
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 362-375

PHOTOCATALYTIC DEGRADATION OF ANAEROBIC TREATED PALM OIL MILL EFFLUENT BY MODIFIED ZnO WITH LEMONGRASS AND KINETIC STUDIES

DILAELEYANA ABU BAKAR SIDIK¹*; NUR HANIS HAYATI HAIROM^2,3; AIDA MUHAMMAD¹; NORASIKIN OTHMAN^4,5; NORELA JUSOH⁴; SITI FATIMAH MOHD NOOR¹; HAFSA MOHAMMAD NOOR¹ and DZULHILMI KAMARUDIN SOHAMI⁶
DOI: https://doi.org/10.21894/jopr.2025.0037  |   Published Online: 23 July 2025
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Vol. 37 (4) December 2025, p. 581-597

PREVALENCE OF WORK-RELATED MUSCULOSKELETAL DISORDERS (WMSDs) AND RECENT INITIATIVES TO ADDRESS THEM IN THE OIL PALM INDUSTRY: A SYSTEMATIC REVIEW

‘UMAR MOHAMAD NOOR¹ and MOHAMAD IKHWAN ZAINI RIDZWAN¹*
DOI: https://doi.org/10.21894/jopr.2024.0048  |   Published Online: 17 October 2024
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REVIEW ARTICLE
Vol. 38 (1) March 2026, p. 35-52

PRECISION AGRICULTURE IMPLEMENTATION TO IMPROVE SUSTAINABILITY AND PRODUCTIVITY OF OIL PALM PLANTATIONS IN INDONESIA: A REVIEW

HASBI MUBARAK SUUD¹*; ANGGA DEFRIAN²; AGUNG NUGROHO PUSPITO³ and AGUS SUSANTO GINTING⁴
DOI: https://doi.org/10.21894/jopr.2025.0013  |   Published Online: 5 March 2025
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 53-64

GENETIC DIVERSITY OF MPOB-ZAIRE OIL PALM (Elaeis guineensis Jacq.) GERMPLASM POPULATION BY MULTIVARIATE ANALYSIS

FATIN MOHD NASIR¹; SUZANA MUSTAFFA¹; MARHALIL MARJUNI¹; WAN NOR SALMIAH TUN MOHD SALIM¹ and ZULKIFLI YAAKUB¹*
DOI: https://doi.org/10.21894/jopr.2024.0050  |   Published Online: 8 November 2024
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 65-77

ANTIFUNGAL ACTIVITY OF ETHANOLIC EXTRACT FROM INDIGENOUS BACTERIUM Bacillus subtilis STRAIN MN704394.1 CULTURE CONTAINING EICOSANE AND ETHYL STEARATE AGAINST Ganoderma boninense

BEDAH RUPAEDAH¹*; RAISADIBA PUTRI BOVANI²; INDRI HANDAYANI¹; ZHAFIRA AMILA HAQQA¹ and CATUR SRIHERWANTO¹
DOI: https://doi.org/10.21894/jopr.2024.0058  |   Published Online: 20 December 2024
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 78-87

THE USE OF FACTORIAL MATING DESIGN FOR ESTIMATION OF COMBINING ABILITIES IN COMMERCIAL OIL PALMS

PATCHARIN TANYA¹; PUNTAREE TAEPRAYOON²; SURAKITTI SRIKUL³; ANEK LIMSRIVILAI⁴ and PEERASAK SRINIVES^1,5*
DOI: https://doi.org/10.21894/jopr.2024.0057  |   Published Online: 20 December 2024
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RESEARCH ARTICLE
Vol. 38 (2) June 2026, p. 376-383

SMALL SCALE FIELD EVALUATION OF A NOVEL PALM-BASED INSECTICIDE FORMULATION USING COLD AND THERMAL FOGGING AGAINST Aedes aegypti

SUMAIYAH MEGAT NABIL MOHSIN¹*; NORASHIKIN AHMAD¹ and YUSRABBIL AMIYATI YUSOF¹
DOI: https://doi.org/10.21894/jopr.2025.0015  |   Published Online: 19 March 2025
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RESEARCH ARTICLE
Vol. 37 (3) September 2025, p. 377-396

DISCOVERING THE GLOBAL LANDSCAPE OF WOOD PRESERVATIVES

NUR AZREENA, I¹*; ZAWAWI, I¹ and NOORSHAMSIANA, A W¹
DOI: https://doi.org/10.21894/jopr.2024.0018  |   Published Online: 21 February 2024
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Vol. 38 (2) June 2026, p. 384-390

PROCESSING OF UNDER AND OVERRIPE OIL PALM FRUITS AND ITS EFFECTS ON YIELD AND OIL QUALITY

MUHAMAD RODDY RAMLI¹*; ABDUL NIEFAIZAL ABDUL HAMMID¹ and ZULKIFLI YAAKUB¹
DOI: https://doi.org/10.21894/jopr.2025.0033  |   Published Online: 8 July 2025
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 88-98

EVALUATION OF DIFFERENT SEED DORMANCY BREAKING METHODS INCLUDING ENZYMATIC ASSAYS FOR GERMINATION IMPROVEMENT IN OIL PALM (Elaeis guineensis Jacq.)

MOHD NORSAZWAN GHAZALI¹*; UMA RANI SINNIAH¹ and PARAMESWARI NAMASIVAYAM²
DOI: https://doi.org/10.21894/jopr.2025.0011  |   Published Online: 3 March 2025
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 99-116

PRICE TRANSMISSION IN THE SUPPLY CHAIN OF INDEPENDENT OIL PALM SMALLHOLDERS IN WEST SUMATERA, INDONESIA: A CASE STUDY IN DHARMASRAYA DISTRICT

LISA NESTI¹*; KHAIRUN NADIYAH² and AHMAD FUDHOLI^3,4
DOI: https://doi.org/10.21894/jopr.2025.0005  |   Published Online: 19 February 2025
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 117-126

MATERIAL AND CURVATURE OF THE OIL PALM HARVESTING KNIFE AND THEIR EFFECTS ON FORCE AND ENERGY REQUIREMENTS

SUTHAKAR B¹*; JANY GILES A¹ and DINESH PANDI M¹
DOI: https://doi.org/10.21894/jopr.2024.0059  |   Published Online: 20 December 2024
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Vol. 38 (1) March 2026, p. 127-135

A PRELIMINARY EVALUATION OF A RADIO-CONTROLLED HYDROSTATIC TRANSMISSION MOWER FOR OIL PALM PLANTATION

MOHD AZWAN BAKRI¹*; NABILAH KAMALIAH MUSTAFFA¹ and MOHD RIZAL AHMAD¹
DOI: https://doi.org/10.21894/jopr.2025.0003  |   Published Online: 19 February 2025
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REVIEW ARTICLE
Vol. 37 (4) December 2025, p. 598-616

GREENING THE PALM OIL INDUSTRY: PROSPECTS AND BARRIERS OF SUPERCRITICAL CO₂ EXTRACTION

DWILA NUR RIZKIYAH¹; NICKY RAHMANA PUTRA^1,2; LAILATUL QOMARIYAH³*; MOHD AZIZI CHE YUNUS¹; HASMADI MAMAT^4,5; AHMAD HAZIM ABDUL AZIZ^4,5; JUMAKIR JUMAKIR⁶; WALUYO WALUYO⁶ and SUPARWOTO SUPARWOTO⁶
DOI: https://doi.org/10.21894/jopr.2024.0038  |   Published Online: 3 July 2024
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 136-146

BIO-OIL AND BIO-HYDROGEN PRODUCTION USING RED MUD CATALYST FROM OIL PALM BIOMASS WASTE

ARIF HIDAYAT¹*; CHOLILA TAMZYSI¹ and MUFLIH ARISA ADNAN¹
DOI: https://doi.org/10.21894/jopr.2025.0001  |   Published Online: 7 January 2025
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Vol. 38 (1) March 2026, p. 147-154

DUAL APPLICATION OF PALM OIL MILL EFFLUENT (POME) AND BENEFICIAL MICROBE ISOLATES FOR Oryza sativa GROWTH UNDER GLASS HOUSE CONDITION

NURUL AIN NAJIHAH MUSA¹; NUR MAIZATUL IDAYU OTHMAN^1,2*; AIDA SORAYA SHAMSUDDIN³; MAISARAH ABDUL MUTALIB⁴; NUR ADIBAH ROSLAN¹; NUR AZALINA SUZIANTI FEISAL⁵ and NOR AZMA YUSUF¹
DOI: https://doi.org/10.21894/jopr.2025.0004  |   Published Online: 19 February 2025
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 155-165

PERFORMANCE OF B10/B20 USAGE IN HEAVY-DUTY DIESEL VEHICLES

DARYL JAY THADDEUS¹*; HARRISON LAU LIK NANG¹; NURSYAIRAH JALIL¹; NUR SULIHATIMARSYILA ABD WAFTI¹; ASTIMAR ABDUL AZIZ¹; CHENG XINWEI ²; GAN SUYIN ² and NG HOON KIAT ²
DOI: https://doi.org/10.21894/jopr.2025.0012  |   Published Online: 5 March 2025
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Vol. 38 (1) March 2026, p. 166-173

SYNTHESIS OF LAURIC-RICH MEDIUM-CHAIN TRIGLYCERIDES FROM PALM KERNEL OIL AND LAURIC ACID BY ENZYMATIC ACIDOLYSIS

AGNES IMELDA MANURUNG¹; ELISA JULIANTI¹*; JANSEN SILALAHI² and DONALD SIAHAAN³
DOI: https://doi.org/10.21894/jopr.2025.0010  |   Published Online: 21 February 2025
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Vol. 37 (4) December 2025, p. 617-626

EFFECT OF PLANTING DENSITY, PROGENY LINEAGE AND NITROGEN FERTILISER ON OIL PALM PERFORMANCE ON ALLUVIAL SOIL

AFANDI, A M¹; NORLIYANA, Z Z¹*; NORDIANA, A A¹; MARHALIL, M¹; MEILINA, O A¹; FARAWAHIDA, M D¹ and HALIMATUL, S A¹
DOI: https://doi.org/10.21894/jopr.2024.0031  |   Published Online: 14 May 2024
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 627-634

LIFE CYCLE, FOLIAR CONSUMPTION RATE, NATURAL ENEMIES AND POPULATION FLUCTUATION OF Phobetron hipparchia CRAMER, 1777 (LEPIDOPTERA: LIMACODIDAE): AN EMERGING PEST OF OIL PALM IN COLOMBIA

CARLOS ENRIQUE BARRIOS-TRILLERAS¹; ROBERTO JOSÉ DIAZ-CASTRO¹; LEIDY JOHANNA CONTRERAS-ARIAS¹ and ANUAR MORALES-RODRÍGUEZ¹*
DOI: https://doi.org/10.21894/jopr.2024.0046  |   Published Online: 20 September 2024
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RESEARCH ARTICLE
Vol. 38 (1) March 2026, p. 174-189

DELVING INTO THE SYNERGISTIC BEHAVIOURS OF TRIBOLOGICAL ADDITIVES IN MINERAL AND VEGETABLE OILS VIA THERMODYNAMIC ANALYSIS

CHUNG-HUNG CHAN¹*; AHMAD SYAFIQ AHMAD HAZMI¹; NOOR KHAIRIN MOHD¹; WEN HUEI LIM¹ and SIN YEE GAN¹
DOI: https://doi.org/10.21894/jopr.2025.0006  |   Published Online: 19 February 2025
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Vol. 37 (2) June 2025, p. 209-223

SPENT BLEACHING EARTH AS VALUE-ADDED MATERIAL TO MATERIAL CONSTRUCTION APPLICATIONS: A REVIEW

FARDIN HASIBUAN^1*; MOHD KAMEL WAN IBRAHIM¹ and NUGROHO PRATOMO ARIYANTO²
DOI: https://doi.org/10.21894/jopr.2024.0028  |   Published Online: 26 April 2024
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 635-645

GENOME SURVEY AND PRELIMINARY GENOMIC CHARACTERISATION OF A KEY OIL PALM POLLINATOR, Elaeidobius kamerunicus

NABEEL ATA¹; MOHD AMIN AB HALIM¹; MUHAMMAD NURUL YAQIN SYARIF¹; SAHARUL ABILLAH MOHAMAD¹; MUHAMMAD DZULHELMI MUHAMMAD NASIR²; SIEW-ENG OOI¹ and MEILINA ONG-ABDULLAH¹*
DOI: https://doi.org/10.21894/jopr.2024.0039  |   Published Online: 21 August 2024
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Vol. 38 (1) March 2026, p. 190-200

GC/Q-TOF-MS-BASED METABOLOMICS: UNVEILING THE TEMPORAL METABOLIC PATHWAYS IN Ganoderma boninense USING PATHWAY ANALYSIS TOOLS

ZAIN NURAZAH¹*; NUR AIN ISHAK¹; NURUL LIYANA ROZALI¹; SHAHIRAH BALQIS DZULKAFLI¹; JAYANTHI NAGAPPAN¹; SHAMALA SUNDRAM¹; ABU SEMAN IDRIS¹ and ABRIZAH OTHMAN¹
DOI: https://doi.org/10.21894/jopr.2025.0019  |   Published Online: 26 March 2025
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 646-657

MULTIDIMENSIONAL ANALYSIS SUSTAINABILITY OF CORN-SOYBEAN INTERCROPPING MODEL IN SMALLHOLDER OIL PALM REPLANTING

SRI AMBAR KUSUMAWATI¹; AGUSTINUS N KAIRUPAN²*; RACHMIWATI YUSUF³; NURHAYATI⁴; IDA NUR ISTINA⁵; F FATHURRAHMAN⁵; HERY WIDYANTO⁶; PARLIN HALOMOAN SINAGA³; TENGKU HARUNUR RASYID⁷ and MEVIE LINTANG⁸
DOI: https://doi.org/10.21894/jopr.2024.0055  |   Published Online: 27 November 2024
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 658-669

QUANTIFYING THE EFFECT OF FERTILISER APPLICATION ON NITROUS OXIDE PULSES IN OIL PALM PLANTATION

NORLIYANA ZIN ZAWAWI¹*; KHO LIP KHOON²; AHMAD AFANDI MURDI¹ and TEH YIT ARN³
DOI: https://doi.org/10.21894/jopr.2024.0032  |   Published Online: 14 May 2024
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 670-683

SEPARATION AND THERMAL MODIFICATION OF MONTMORILLONITE FROM TANAH DATAR CLAY AND ITS CATALYTIC APPLICATION IN BIODIESEL PRODUCTION FROM WASTE FRYING OILS

ZARNIDA WIDIA NENGSIH¹; RAHAYU RAHAYU¹; SYUKRI ARIEF¹; UPITA SEPTIANI¹; MATLAL FAJRI ALIF¹ and SYUKRI SYUKRI¹*
DOI: https://doi.org/10.21894/jopr.2024.0041  |   Published Online: 2 September 2024
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 684-695

A BIOMECHANICAL ANALYSIS ON WORKRELATED MUSCULOSKELETAL DISORDERS USING A MECHANISED CHAINSAW FOR OIL PALM HARVESTING

UMESH GANESH¹; ZAIDI MOHD RIPIN¹; WAN MOHD AMRI WAN MAMAT ALI¹; YEO YING HENG¹; MITCHELLE LAW JYY JINN¹; JEEVINTHIRAN KARUNAGARAN¹ and MOHAMAD IKHWAN ZAINI RIDZWAN¹*
DOI: https://doi.org/10.21894/jopr.2024.0045  |   Published Online: 19 September 2024
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 696-706

ENCAPSULATED ACIDIC ASPIRIN-BASED EUTECTIC SOLVENTS FOR ESTERIFICATION OF FREE FATTY ACID

ADEEB HAYYAN^1,2*; JIAN LING LEONG¹; ANDREW T H YEOW^1,2; HANEE F. HIZADDIN^1,2; YOUSEF MOHAMMED ALANAZI³; JEHAD SALEH³; BARUN KUMAR CHAKRABARTI⁴; CHEE TONG JOHN LOW⁵ and SHARIFAH SHAHIRA SYED PUTRA¹
DOI: https://doi.org/10.21894/jopr.2024.0047  |   Published Online: 30 September 2024
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REVIEW ARTICLE
Vol. 37 (3) September 2025, p. 397-420

ENHANCING CORROSION RESISTANCE IN BIODIESEL DISTRIBUTION AND TERMINAL OPERATIONS: A COMPREHENSIVE MATERIALS COMPATIBILITY REVIEW

NUR NAQIUDDIN MDD NORDIN^{1 *}; MOHD NASHRUL MOHD ZUBIR^{1 *}; SALIM NEWAZ KAZI¹ and NURIN WAHIDAH MOHD ZULKIFLI¹
DOI: https://doi.org/10.21894/jopr.2024.0033  |   Published Online: 27 May 2024
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RESEARCH ARTICLE
Vol. 37 (3) September 2025, p. 421-429

EFFECT OF OIL PALM FROND UTILISATION AS GREEN ROUGHAGE FEED ON KATJANG GOAT’S BODY WEIGHT

MD ZAINAL RASYIDI MAT RODI¹*; KAMIL AZMI TOHIRAN¹ and RAJA ZULKIFLI RAJA OMAR¹
DOI: https://doi.org/10.21894/jopr.2024.0020  |   Published Online: 13 March 2024
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RESEARCH ARTICLE
Vol. 37 (4) December 2025, p. 707-718

INVESTIGATION ON MECHANICAL AND CORROSION CHARACTERISTICS OF ASME SA 516 GRADE 70 CARBON STEEL USED IN A BIODIESEL STORAGE FACILITY

NUR NAQIUDDIN MDD NORDIN¹*; MOHD NASHRUL MOHD ZUBIR¹*; SALIM NEWAZ KAZI¹ and NURIN WAHIDAH MOHD ZULKIFLI¹
DOI: https://doi.org/10.21894/jopr.2024.0044  |   Published Online: 9 September 2024
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REVIEW ARTICLE
Vol. 37 (1) March 2025, p. 1-15

A PICTURE OF RIPENESS: INVESTIGATING IMAGE-BASED TECHNIQUES FOR OIL PALM FRUIT GRADING

MUNIRAH ROSBI¹*; ZAID OMAR¹ and MARSYITA HANAFI²
DOI: https://doi.org/10.21894/jopr.2024.0015  |   Published Online: 14 February 2024
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