Studies of bunch analysis 2 “ bunch sampling to estimate oil yield

Corley R. H. V., . Studies of bunch analysis 2 “ bunch sampling to estimate oil yield. pp. 206-218. ISSN 1511-2780

To estimate oil yield in research trials fresh fruit bunch (FFB) yield is multiplied by the oil/bunch determined on a sample of bunches but there is no standard method for sampling bunches. Data from palms in which all bunches were analysed for seven years allowed actual mean oil/bunch (O/B) and oil yields to be calculated and compared with estimates from samples. Samples of five bunches per palm gave poor precision with 95 confidence limits of about 4 O/B. Increasing the number of bunches to 10 per palm gave confidence limits of about 2.5 O/B. Alternatives include analysing more bunches only if the coefficient of variation (CV) for five bunches is large or measuring fruit/bunch and oil / mesocarp on 10 bunches and mesocarp / fruit which is less variable on only two or three bunches. The mean O/B of five bunches may give acceptable estimates of oil yield per palm. For progeny or treatment mean oil yields the mean of 50 bunches per progeny gives a CV of about 10. Precision is increased if a bunch is sampled from every palm rather than at random from the progeny. When considering mechanisation of bunch analysis a method in which the bunch components are determined on different bunches has no disadvantages.

Full text available from: Official URL: http://jopr.mpob.gov.my/studies-of-bunch-analysis-...

Abstract

To estimate oil yield in research trials fresh fruit bunch (FFB) yield is multiplied by the oil/bunch determined on a sample of bunches but there is no standard method for sampling bunches. Data from palms in which all bunches were analysed for seven years allowed actual mean oil/bunch (O/B) and oil yields to be calculated and compared with estimates from samples. Samples of five bunches per palm gave poor precision with 95 confidence limits of about 4 O/B. Increasing the number of bunches to 10 per palm gave confidence limits of about 2.5 O/B. Alternatives include analysing more bunches only if the coefficient of variation (CV) for five bunches is large or measuring fruit/bunch and oil / mesocarp on 10 bunches and mesocarp / fruit which is less variable on only two or three bunches. The mean O/B of five bunches may give acceptable estimates of oil yield per palm. For progeny or treatment mean oil yields the mean of 50 bunches per progeny gives a CV of about 10. Precision is increased if a bunch is sampled from every palm rather than at random from the progeny. When considering mechanisation of bunch analysis a method in which the bunch components are determined on different bunches has no disadvantages.

[error in script]

Item Type:	Article
AGROVOC Term:	Oil palm
AGROVOC Term:	Elaeis guineensis
AGROVOC Term:	Fruit
AGROVOC Term:	Yields
AGROVOC Term:	Oils
AGROVOC Term:	Mesocarp
AGROVOC Term:	Progeny
AGROVOC Term:	Size
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/24099

Actions (login required)

View Item