福岡県北部の黒ボク土と灰色低地土の理化学性の差異が稲体および産米の食味関連成分に及ぼす影響

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  • Nitrogen and Mineral Contents of Rice Grown on Two Paddy Soils with Different Cation Exchange Characteristics
  • フクオカケン ホクブ ノ クロボクド ト ハイイロ テイチド ノ リカガクセイ

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We grew rice plant (Oriza sativa japonica) on a Gray Lowland soil (GL) and an Andosol (AN), which have been reported to produce rice of different quality, and monitored the soil solution composition during the growing period. We also analyzed the harvested rice straw, brown rice and milled rice for N, Ca, Mg and K. The Ca^<2+>, Mg^<2+> and NH_4^+ concentrations in the soil solution were significantly higher in GL than those in AN, whereas the K^+ concentration was higher in AN throughout the growing season. There was no simple correlation between the soil solution cation composition and the exchangeable cation composition, but the former could be predicted from the latter based on the separately-determined cation exchange selectivity of the soils. Reflecting the soil solution composition, the N, Ca and Mg contents of the rice straw from GL were significantly higher than those from AN, whereas the K content was lower. The difference in N and mineral contents of the brown rice and milled rice from GL and AN, on the other hand, could not be explained by the soil solution composition, indicating that they were under larger influence of translocation physiology in the rice plant.

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