Journal of Oil Palm Research Vol. 29  March 2017 p.  11-22
DOI:

STATISTICAL GUIDELINES FOR COMPARING COMMERCIAL OIL PALM VARIETIES

Author(s): BREURE, C J*

Sam­ples of 42 dura x pisifera prog­e­nies of Ekona, AVROS, Ghana and Nige­ria oil palm vari­eties, each involv­ing six pisifera, were used to deter­mine the min­i­mum sam­ple size of their par­ents for obtain­ing sta­tis­ti­cal yield dif­fer­ences between vari­eties. The 95% con­fi­dence inter­val of dif­fer­ences between vari­eties decreased sharply and, hence, the pre­ci­sion of the test improved, when increas­ing the num­ber of prog­e­nies from 6 to 30 and pisifera (involved) from 1 to 4 and then lev­elled off to a steady decre­ment. As a test of dif­fer­ences the con­fi­dence inter­val has only a power of 50%, being the prob­a­bil­ity that a false null hypoth­e­sis of zero dif­fer­ence between vari­eties is rejected. With a power of 80%, a sam­ple of 60 prog­e­nies in three repli­ca­tions detects, depend­ing on the vari­ance of the pisifera par­ents, a sig­nif­i­cant yield dif­fer­ence of 4.5% between Nige­ria and AVROS and 7% between Ghana and Ekona with 6 and 9 pisifera in the sam­ple, respec­tively. The arti­cle argues to incor­po­rate opti­mal plant­ing den­sity as a cru­cial trait in select­ing oil palm vari­eties. This study offers a method to obtain unbi­ased prog­eny sam­ples, along with a field lay out for bulk record­ing of prog­eny plots.

Keywords: , , ,

Author Information
* Malaysian Palm Oil Board, 6 Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia. E-mail:


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