Effect of plant density on yield, seed quality and seed storability of soybean (Glycine Max (L.) Merrill)
1991
Arunwan Wongmaneroj
Soybean seeds were planted in rainy season 1989 at the National Corn and Sorghum Research Center, Pakchong, Nakhon Ratchasima to determine the effect of plant density on seed yield and seed quality in soybean cv. NW1 and SJ4. The plant densities used in this study were 200,000, 400,000 and 600,000 plants per hectare plant height, plant dry weight, number of leaf, yield and yield components were collected. Seed quality was also determined which included germination, vigor, moisture content, seed health, greenness of seed and breakage susceptibility. Consequently, seeds were stored for 8 months in ambient condition to evaluate changes in seed germination, vigor and seed moisture content. The experiment was repeated in rainy season 1990, at Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom but only yield, yield components and seed quality were studied. Seed yield increased as plant density increased from 200,000 to 400,000 plants per hectare but did not significantly increase when the density increased from 400,000 to 600,000 plants per hectare. For the results at Kamphaeng Saen in 1990, the highest seed yield was obtained at 400,000 plants per hectare. NW1 soybean gave a higher seed yield than SJ4 soybean in both experiments. In laboratory, none of germination, vigor and storability of seeds was significantly affected by plant density. SJ4 cultivar gave higher quality seeds than NW1 cultivar in both experiments. In conclusion, the suitable plant density for both soybean cultivars studied was 400,000 plants per hectare because it gave the highest seed yield and seed quality that was not significantly different comparing to seed quality from 200,000 and 600,000 plants per hectare.
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