Effect of plant density on yield and seed quality of mungbean [Vigna radiata (L.) Wilczek]
1992
Chanprasert, W. | Kaewpichit, S. | Chareonpanit, S. | Rujirawat, P. (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Effect of plant density on yield and seed quality was studied in 2 mungbean varieties, i.e. Kamphaeng Saen 1 and Kamphaeng Saen 2, using the systematic design type la of Nelder. The results revealed that pod number per plant decreased as plant density increased whereas seed yield per unit area increased as plant density increased. The optimum plant density that gave the highest seed yield of both varieties was 50 plants/square m (500,000 plants/ha). Plant density had little or no effect on seed number per pod, seed weight and seed quality at harvest. Seeds harvested at 75 days after planting (DAP) showed a lower quality than seeds harvested at 60 DAP regardless of the effect of plant density. Electrical conductivity of seed leachate was closely correlated with seed germination when harvested at 75 DAP. The observations on seed germination during storage revealed that seeds of high density planting performed a poorer storability than those of low density planting. These differences were due mainly to seed damage by bruchids (Collosobruchus spp.) which were found in a greater number in seeds of high density planting.
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