Effects of excess moisture in the soil at different stages of development on the growth and seed yield of soybean
2000
Sugimoto, H. (Ehime Univ., Matsuyama (Japan). Faculty of Agriculture) | Koesmaryono, Y. | Nakano, R.
At the stages of flower bud differentiation and ripening, soybean plants grown in pots were treated with two levels of excess moisture in the soil; waterlogging (water table of 5 to 7 cm below the soil surface), and flooding (water table of 2 to 3 cm above the soil surface) for various days. Growth, seed yield, and yield components were investigated. At the flower bud differentiation stage, seed yield and vegetative growth were markedly depressed by both waterlogging and flooding treatments. The longer the duration of the treatment, the severer the effects on seed yield. In this case, the numbers of branches and nodes per plant were decreased, whilst the shedding of buds, flowers and pods were increased. The resultant decrease in the number of pods per plant was the major reason for the decreased, whilst the shedding of buds, flowers and pods were increased. The resultant decreased in the jumper of pods per plant was the major reason for the decrease in seed yield. At the ripening stage, soybean was more tolerant to excess moisture in the soil. Vegetative growth was not affected by either treatment of the water table. Further, seed yield was not decreased significantly from control, within 20 days waterlogging and 4 days' flooding; however, it decreased when the term of the treatment was longer than that,. The major reason for the decrease in seed yield was due to the decrease in the 100 seed weight.
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