Effects of Deep Plowing with a Chisel Plow Before Wheat Seeding on Rate of Soil Pulverization, Soil Physical Properties, Drainage, growth and Yield During Soybean Cultivation in an Upland Field Converted from Paddy Field with Three-Crop Rotation of Rice, Wheat, and Soybean in Two Years

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  • KAWARADA Naoya
    Mie Prefecture Agricultural Research Institute Mie Prefectural Government
  • TABATA Shigeki
    Mie Prefecture Agricultural Research Institute Mie Prefecture Agricultural Central Extension Center
  • UCHIYAMA Yusuke
    Mie Prefecture Agricultural Research Institute Mie Prefecture Agricultural Central Extension Center

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Other Title
  • 小麦前のチゼルプラウによる深耕が水稲-小麦-大豆の2年3作で輪作される水田転換畑における大豆作時の砕土率，土壌物理性，排水性，生育，収量に及ぼす影響
  • コムギ マエ ノ チゼルプラウ ニ ヨル シンコウ ガ スイトウ-コムギ-ダイズ ノ 2ネン 3サク デ リンサク サレル スイデン テンカンバタケ ニ オケル ダイズサクジ ノ サイドリツ,ドジョウ ブツリセイ,ハイスイセイ,セイイク,シュウリョウ ニ オヨボス エイキョウ

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Abstract

<p>This study compared a work system consisting of deep plowing with a chisel plow (deep plowing→soil pulverization→wheat seeding→shallow tillage→soybean seeding, hereinafter referred to as “chisel deep plowing system”) with a conventional seeding system consisting of shallow tillage with a rotary tiller (shallow tillage→wheat seeding→shallow tillage→soybean seeding) to investigate the effects of soil moisture and rate of soil pulverization during seeding-related operations, soil physical properties, drainage, growth and yield during soybean cultivation, in an upland field converted from paddy field with three-crop rotation of rice, wheat, and soybean in two years without underdrain construction. The results showed that the chisel deep plowing system reduced soil moisture during shallow tillage before soybean seeding, and increased the work speed and rate of soil pulverization, and slightly improved the soil pulverization rate during seeding. In addition, the porosity, gas phase ratio, available water, and saturated hydraulic conductivity were increased in the subsoil, and these effects were maintained until soybean harvest. Furthermore, drainage of the plow layer during soybean growth was improved by the improvement of physical properties in the subsoil. The results showed that soybean yield was increased by 11-13％ with increases in number of branches, total number of pods, and number of ripening pods under the chisel deep plowing system. However, without underdrain construction and with poor water permeability of the subsoil, and with intermittent heavy rainfall before soybean seeding, seeding may be delayed and soybean yield may be decreased, even with the chisel deep plowing system. Therefore, the chisel deep plowing system should be combined with drainage technology in the subsoil, if necessary for stable introduction of the system to a production site.</p>

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