Effects on growth and seed yield of small seed soybean [Glycine max]cultivars of flooding conditions in paddy field
2006
Cho, J.W.(Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Yamakawa, T.
Field studies were carried out on a commerce silt loam soil in a paddy field using three soybean (Glycine max L.) cultivars, Pungsan-namulkong, Sobaeg-namulkong and Saebyeolkong of determinate growth type, which have different productivity. The flood duration for 3, 5, 7 and 9 days, respectively when plants at the vegetative (V5 to V6) stages were filled with tap water to 2 cm above the level of the soil surface by irrigation. After removal of flooding, photosynthetic rate reduced in all flooding treatments except for 3 days' flooding. Reduction of photosynthetic rate was relatively lower in Saebyeolkong than any others. The number of pod and seed decreased as much as the flood period was prolonged. There was a significantly positive relationship (RE2=0.50, p0.01) between the ratio of seed yield on branch stem against that on main stem and the seed yield of three soybean cultivars treated with flooding. Also, the relationship between the seed yield and the relative yield of the flooded soybean to non-flooded one had a high positive significance, and there was more significant difference in relative yield of branch stem (RE2
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