The soil fertility status and soybean productivity in paddy-upland rotation fields in Japan's Chikugo River basin

ODAHARA Koji, FUKUSHIMA Yusuke, ARAKI Masato, KANEKO Akira, ARAMAKI Kouichiro

doi:10.20710/dojo.83.4_405

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Other Title

筑後川流域の田畑輪換圃場における土壌肥沃度とダイズ子実収量性の実態
チクゴガワリュウイキノタハタリンカンホジョウニオケルドジョウヒヨクドトダイズシジツシュウリョウセイノジッタイ

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Abstract

Continuous cropping has led to declining soybean productivity. We investigated the relationship between soybean yield and soil fertility in fields with different histories of upland and paddy rice cultivation in Japan's Chikugo River basin to identify the primary factors that influence soybean productivity. The total soil carbon (C) and nitrogen (N) contents and the available N content decreased with repeated soybean cropping. The air-filled pore ratio of the soil at a water potential of -3.1 kPa decreased as the soil's C content decreased. Available N decreased during soybean cultivation, but partially recovered within half a year. Soybean yield decreased with increasing number of soybean crops; it was weakly but significantly correlated with available N (P<0.05), but was strongly and significantly correlated (P<0.01) with the soil's air-filled pore ratio at a water potential of -3.1 kPa. These results suggest that soybean productivity could be improved primarily by increasing soil porosity and secondarily by increasing available N.

Journal

Japanese Journal of Soil Science and Plant Nutrition

Japanese Journal of Soil Science and Plant Nutrition 83 (4), 405-411, 2012

Japanese Society of Soil Science and Plant Nutrition

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