Growth, nodule activity and yield of soybeans as affected by the form and application method of combined nitrogen
| Autor: | Raafat K. Rabie, Yasuhiro Arima, Kikuo Kumazawa |
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| Rok vydání: | 1979 |
| Předmět: | |
| Zdroj: | Soil Science and Plant Nutrition. 25:417-424 |
| ISSN: | 1747-0765 0038-0768 |
| DOI: | 10.1080/00380768.1979.10433182 |
| Popis: | 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 an... |
| Databáze: | OpenAIRE |
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