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Scirj Volume II, Issue XI, November 2014 Edition
ISSN: 2201-2796

Oil palm (Elaeis guineensis Jacq.) Block Sex Ratio

HENDERSON William J., PURBA Olivia., PURBA Hana Immanuella, TJEUW Juliana

Abstract: Block Sex Ratio (BSR) is an operational or commercial measure of the number of palms producing fruit relative to palm planting density for any given period. It is different to the oil palm sex ratio which is a biological measure that calculates the number of female inflorescences relative to the total number of inflorescences. Three blocks were assessed and compared; two younger, adjacent blocks (A and B) and one older block (C). Block A had a BSR average of 29.9 (40 bunches) calculated over four years, BSR maximum of 48 (65 bunches), and BSR minimum of 14 (19 bunches). Block B had a BSR average of 19 (26 bunches) also calculated over four years, BSR maximum of 32 (44 bunches), and BSR minimum of 13 (18 bunches). Block C had a BSR average 10.3 (14 bunches) calculated over 21 years, BSR maximum of 13.4 (18 bunches) and BSR minimum of 6.6 (9 bunches). Effectively this means that for block C on average only 14 palms per hectare out of a possible 136 palms were productive during a harvest round. The differences between blocks A/B and C are likely due to improved breeding; however their different ages, planting material and locations will be contributing factors and must be considered carefully. While increases in BSR are significant, in general they fall well short of theoretical. Maintaining a BSR48 could theoretically produce 57.29 t/ha, at least in block A. These results highlight the degree of variation within and between blocks. It is therefore important that managers, researchers and breeders are aware of, and understand palm growth and development from a commercial perspective. Increasing BSR and minimising fluctuations in yield have distinct commercial and logistical advantages.

Reference this Paper: Oil palm (Elaeis guineensis Jacq.) Block Sex Ratio by HENDERSON William J., PURBA Olivia., PURBA Hana Immanuella, TJEUW Juliana published at: "Scientific Research Journal (Scirj), Volume II, Issue XI, November 2014 Edition, Page 19-22 ".

Search Terms: Block Efficiency Indicator (BEI), Bunch harvesting, Frond production rate, Harvest rounds, Improving agronomic performance, Increasing yield, Palms per hectare

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