水稲の収穫量と施肥量からみた下流環境への負荷

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  • Downstream Environmental Impact Evaluation from Rice Yield and Fertilizer Application Aspect
  • スイトウ ノ シュウカクリョウ ト セヒリョウ カラ ミタ カリュウ カンキョウ エノ フカ カホクガタ エンガン テイヘイ スイデン チタイ ノ タンイ スイデン ニ オケル T N T P シュウシ ノ ジレイ

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The purpose of this research is to clarify the actual phenomena and evaluation of the nitrogen and phosphorus input/output balance in a paddy field located in the lowlands of Kahokugata. The authors found that the amount of chemical fertilizer that was applied to this field accounts for a high percentage in the N and P input. The authors also found the amount of yield with husk taken out from this field accounts for a high percentage in the N and P output. Because the amount of N and P in the yield was greater than the applied fertilizer, these two elements, N and P, could be supplied from acidic oxide fallout, nitrogen fixation and irrigation water. We clearly demonstrated that rice in a paddy is “a crop purifier” or “a cleaning crop” and plays an important role on the purification of the paddy system environment absorbing nitrogen pollution. With this point of view, we concluded that rice production in the lowlands of Kahokugata is environmentally-friendly agriculture.

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