Outflow Characteristics of Total Nitrogen and Total Phosphorous of an Andisol Paddy Field in the Cool-temperate Zone during a Cropping Period

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  • 稲作期における冷温帯地黒ボク土水田の窒素とリンの流出特性
  • イナサクキ ニ オケル レイオンタイ チ クロボクド スイデン ノ チッソ ト リン ノ リュウシュツ トクセイ

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Abstract

We investigated the water budget and outflow characteristics of total phosphorous (T-P) and total nitrogen (T-N) of an irrigated paddy field on an Andisol in the cool-temperate zone area. Total effluent flux of water from the paddy field during one cropping period was 2192 mm, 1490 mm (ca. 70%) of which flowed out through the downward percolation. The net discharge of T-P and T-N from the paddy field during one cropping period was 0.47 kg/ha and 35.9 kg/ha, respectively, most of which flowed out through downward percolation. Amounts of T-P and T-N discharged through sublayer soil to the ground water with the downward water percolation corresponded to 23% and 80% of those leached out from the plow layer soil, respectively.

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