Effects of water management on inorganic arsenic concentration in rice grains in V-furrow direct seeding cultivation

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  • V溝直播栽培における出穂期前後の落水によるコメ中無機ヒ素低減効果
  • Vミゾ ジカマキ サイバイ ニ オケル シュッスイキ ゼンゴ ノ ラクスイ ニ ヨル コメ チュウ ムキ ヒソ テイゲン コウカ

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Abstract

<p>Inorganic arsenic (As) concentration in rice grains in transplanting paddy fields has recently been suggested by investigations to be lowered by draining. The process occurred for 4 days. It was repeated six times (6-drainage) over a total of 6 weeks, 3 weeks before and after the heading. We examined the effects of 4-day drainage repeated three times (3-drainage) on inorganic As in rice grains in V-furrow direct seeding cultivation. Decrease in the volumetric soil water contents and increase in soil redox potential were found during the drainage periods in the 6-drainage and 3-drainage plots, respectively. In both the plots, total As concentrations in the soil solution were lowered relative to those in the continuously flooded plots, resulting in a decrease in grain inorganic As. However, the grain yield and quality were negatively affected in the drainage plots. The distribution of rice roots in the V-furrow paddy field was concentrated on a soil depth of 0–5 cm, shallower than that typically found in the transplanting paddy field. We conclude that inorganic As concentration of rice grains in the V-furrow paddy fields can be lowered by the 4-day drainage repeated three times without decreasing the grain yield and quality in the absence of high-temperature conditions during the draining period.</p>

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