Effects of ammonium nitrogen and nitrate nitrogen on the root system development of different rice [Oryza sativa] varieties
2006
Noma, T.(Saga Univ. (Japan). Faculty of Agriculture) | Hirose, D. | Arima, S.
As a part to elucidate the influence that the chemical combination forms of nitrogen fertilizer gave to root system of different rice ecotypes, with nitrate nitrogen and ammonium nitrogen as nitrogen source, nine varieties has compared in water culture. As a result, better root system development was accepted in fertilizer nitrate nitrogen in three foreign rice varieties. Therefore the root system development of a case variety (IR24) and a control variety (Koshihikari) was examined and compared more in detail. The growth of IR24 was significantly higher compare to Koshihikari in nitrate and vice versa in ammonium until 75th day, In addition it was suggested that the nodal root number and degree of branching causes the total root length differences. Furthermore, it was shown that the difference of root system development was influenced by chemical form of nitrogen. However, a constant tendency was not seen in an ecotype and differences in root system formation and plant growth was suggested.
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