抄録
The effects of early defloration on the growth, flowering and fruiting in peanut were studied. Variety “Java” was used. The seeds were sown on 6 th, May and on 6 th, June. All buds just before anthesis were removed during 15, 30 and 45 days from the beginning of flowering both in the two sowing dates. In the check plots no buds were removed. The results obtained were as follows:
(1) As the defloration period became longer, the growth was more vigorous and the branching increased.It may be due to the fact that no nutrition was consumed for flowering and fruiting during the defloration periods.
(2) The defloration increased the number of flowers per plant. For example, in the series sown in May, the number of flowers of plants deflorated during 30 days was about 1.5 times as much as that of check plants, and that of 45-days defloration was about 3 times indeed. The increased number of flowers in the plots of longer defloration periods may depend upon the increased number of nodes which is caused by the increased branching and also upon the increased number of flowers per node.
(3) As the defloration period was longer, the number of flower set increased, but at the same time the number of flowers increased also, and thus the set percentage did not show the same tendency as the number of flower set.
(4) The longer the defloration period, the worse the fertility of ovules in pod. That is, the percentage of normal seeds decreased and that of incomplete seeds and aborted ovules increased. On the other hand, the plants deflorated longer had the larger number of pods, and so the total weight of seeds per plant showed little differences among each plot, except the plot of 45 days defloration sown in June which showed very low yield of seeds.
