Effects of Harvesting dates on different characters and quality of groundnut seed
1994
Sarat Sattayarak | Paisan Laosuwan (Prince of Songkla Univ., Songkhla (Thailand))
This study was aimed at investigating the effect of harvesting periods on various characters of groundnut grown in Phatthalung and Songkhla provinces. A split-plot design was used in which six groundnut varieties including Tainan 9, Khon Kaen 60-1, Lampang, Tainung 2, RCM 387 and S.K. 38 were grown in the main-plots and different harvesting dates including 88, 98, 108, 118 and 128 days after planting were applied in the sub-plots. The experiment showed that groundnut variety RCM 387 gave the highest pod yield of 307 kg/rai (1 rai = 0.16 ha). Among recommended varieties, Tainan 9 gave the highest pod yield of 240 kg/rai. Harvesting dates exhibited certain effects on yield, 100 seed weight, shelling percentage, oil and protein contents of groundnut. The highest yield was obtained from groundnut harvested at 98 days after planting. The most suitable harvesting dates for most varieties were 98-108 days with the exception of RCM 387 which should be havested at 118 days. In this experiment, groundnut pods were classified into four development stages : very young pods, immature pods, mature pods and over-mature pods. The suitable harvesting periods for most varieties of groundnut in which the proportion of mature pods was highest were 98 days after planting. The highest germination rates of groundnut was found for most varieties to be in between 88 and 98 days after planting. These findings indicate that immature seeds of groundnut can be used as seeds.
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