Concentrations of nutrient content in rice variety Koshihikari Kan No.1 and risk estimation of incidence of brown spot disease in different paddy fields

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  • 異なる水田土壌におけるコシヒカリ環1号の無機成分含有率とごま葉枯病罹病リスクの評価
  • コトナル スイデン ドジョウ ニ オケル コシヒカリカン 1ゴウ ノ ムキ セイブン ガンユウリツ ト ゴマハガレビョウリビョウ リスク ノ ヒョウカ

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Abstract

<p>This study was conducted to assess the effect of rice variety Koshihikari Kan No.1, which is a mutant with nearly cadmium-free grains produced by irradiation with heavy-ion beams, on the incidence of rice brown spot disease in different paddy fields, including Akiochi. We also investigated the effects of Mn-bearing materials on brown spot disease and rice productivity. A summary follows.</p><p>(1) Brown spot disease tended to occur under soil conditions with low P, Si, and exchangeable cation (Ca, Mg, K, and Mn) availability.</p><p>(2) Brown spot lesions in flag leaves were induced by low K, Si, Mn, and Fe contents in shoots.</p><p>(3) Koshihikari Kan No. 1 rice showed a higher ratio of brown spots than the Koshihikari variety, but it recovered by applying the Mn-bearing material.</p><p>(4) Koshihikari Kan No.1 rice contained low levels of Mn and high levels of Fe in its shoots compared to the Koshihikari variety.</p><p>(5) The rice grain yield of Koshihikari Kan No.1 rice was lower than that of the Koshihikari variety in paddy fields where brown spot disease has occurred. However, the yield of Koshihikari Kan No.1 was improved by applying Mn-bearing material.</p>

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