Effects of Fertilizers and Preparation Methods after Harvesting Rice on Mineral and DCAD of Rice Straw

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  • 肥料および調製方法の違いが稲わらのミネラル含量とDCAD値に及ぼす影響
  • ヒリョウ オヨビ チョウセイ ホウホウ ノ チガイ ガ イネワラ ノ ミネラル ガンリョウ ト DCADチ ニ オヨボス エイキョウ

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Abstract

In order to obtain low DCAD (Dietary Cation-Anion Differences) of rice straw, mineral content and DCAD of rice straw were measured through using different fertilizers and preparation methods in the experiment. Under the same base fertilizer condition, ammonium sulfate or ammonium chloride were applied as additional fertilizers. After harvesting the full-ripe stage rice, they were put under the paddy field exposition (0, 7, 14, 30, 60 days) and paddy-sheaf racking (30 days), silage (30 days), the mineral content and DCAD of rice straw were measured again. In order to ascertain the effect of rainfall on mineral content and DCAD of rice straw, an artificial rainfall experiment was implemented. DCAD of rice straw applied ammonium sulfate was lower than that applied ammonium chloride. The K, Cl content and DCAD of rice straw showed a decreasing tendency after the paddy field exposition and paddy-sheaf racking. About the artificial rainfall experiment, the K, Cl content and DCAD of rice straw decreased sharply after 100mm rainfall. Through the experiment, low DCAD of rice straw could be obtained which applied ammonium sulfate and adopted paddy-sheaf racking and paddy field exposition methods at the same time exposed the rice straw in the rain moderately.

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