GROWTH, NODULE ACTIVITY AND YIELD OF SOYBEANS AS AFFECTED BY THE FORM AND APPLICATION METHOD OF COMBINED NITROGEN
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概要
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A pot experiment was conducted to investigate the effect of the form and application method of combined nitrogen on growth, nitrogen fixation and yield of soybean plant. Nitrate, ammonium, or urea was applied as surface, homogeneous, or deep application. Spraying technique was also used with urea. All treatments increased the dry matter accumulation in plant at initial flowering as well at initial pod filling. At pod filling, N treatments increased the number but not the weight of pods. Surface application of different nitrogen forms was the most promotive treatment on dry weight particularly with nitrate. Concerning the nodule dry weight, at initial pod filling, surface N applications had no depressive effect. At pod filling stage, surface application of nitrate was the most promotive treatment. Basal dressing of ammonium or urea was slightly promotive, while urea spray was repressive. Concerning the acetylene reducing activity of nodules, all N treatments were almost repressive on both total and specific nodule activities. With respect to the nitrogen accumulation in plant, at initial flowering, all N treatments were almost promotive, and the same was almost true at initial pod filling, particularly with surface application. At pod filling, surface applications of combined nitrogen were promotive. Concerning the yield, except for the surface application of ammonium which increased the seed yield and pod number per plant, all N treatments were either not effective or depressive.
- 社団法人日本土壌肥料学会の論文
著者
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Rabie Raafat
Department Of Agricultural Chemistry Univerisy Of Tokyo
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Rabie Raafat
Department Of Agricultural Chemistry The University Of Tokyo
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Arima Yasuhiro
Department Of Agricultural Chemistry Univerisy Of Tokyo
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Arima Yasuhiro
Department Of Agricultural Chemistry The University Of Tokyo
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Kumazawa Kikuo
Department Of Agricultural Chemistry Univerisy Of Tokyo
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Kumazawa Kikuo
Department Of Agricultural Chemistry The University Of Tokyo
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