| Project/Area Number |
02660016
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
作物
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| Research Institution | Ehime University |
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Principal Investigator |
SUGIMOTO Hideki Ehime University, College of Agriculture, Associate Professor, 農学部, 助教授 (40112255)
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| Co-Investigator(Kenkyū-buntansha) |
SATOU Tooru Ehime University, College of Agriculture, Professor, 農学部, 教授 (50036315)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Application of Nitrogen Fertilizer / Excessive Soil Moisture / Photosynthesis / Seed Yield / Soybean / 葉位 / 窒素固定 / 物質生産 |
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| Research Abstract |
1. The first purpose of this experiment was to examine whether the application of nitrogen (N) fertilizer as ammonium sulfate is effective as a countermeasure against excess moisture injury to soybeans[Glycine max (L.) Merr. ]. Soybeans (C. V. Tamahomare) were grown in an upland field converted from paddy. Flooding treatment was conducted in the furrows to a depth of 5 to 8 cm for 10 days at flower-bud differentiation stage and subsequently fertilizer was applied at 12g N per m^2.
In the non-flooding plot, seed yield did not increased due to the supplemental- N, however in the flooding plot, it was increased by about 20%. The increase in seed yield was brought about the increase in the number of pods.
2. The second purpose of this experiment was to examine how the number of pods increased due to the supplemental N. At the flower-bud differentiation stage, soybean plants cultivated in pots were treated with tree soil moisture conditions for 7 days : excess moisture (water table of 5 to 7. cm below the soil surface), flooding (water table of 2 to 3 cm above the soil surface) and control, and subsequently ammonium sulfate was applied at 5g per pot.
In the excess moisture and flooding plots without the supplemental N, the total number of nodes per plant and the number of pods per node decreased. The resultant decrease in. the number of pods brought about decrease in seed yield. However, in those plots with the supplemental N, the number of pods per node increased and the resultant increase of the number of pods brought about increase in seed yield. It was assumed that increase in the number of pods per node was attributed to increase in photosynthetic rate.
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