Growth Habit of Forage Crops in Conversion from Paddy Field of I11-Drained Cleyey Soil into Upland Field : II. Species differences of root growth and oxidation of soil

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  • 低湿重粘土水田の転換畑における飼料作物の生育特性 : II.転換初期における地下部生育の種間差と土層の酸化
  • 低湿重粘土水田の転換畑における飼料作物の生育特性-2-転換初期における地下部生育の種間差と土層の酸化
  • テイシツ ジュウネンド スイデン ノ テンカンバタ ニ オケル シリョウ サク

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Abstract

The characters and yearly changes in root growth of forage crops and soybean were examined for 4 years in conversion from paddy field of ill-drained cleyey soil into upland field. Species used were corn, sorghum, rhodesgrass, green panic and soybean. The methods of cultivation were same descrived in the former papper. The results are summarized as follows ; 1) In the first year of the conversion, the depth of root penetration was shallow and most of roots were confined to the upper 10cm layer of soil in all species. The root penetration rate was gradually improved with a lapse of time. 2) After the second year from the convertion, sorghum roots could penetrate through the traces of roots of rice which was planted before conversion, and the two tropical grasses roots could grow through there after three years, so the roots of such species distributed uniformly under the plow layer. Corn and soybean roots could grow through only the cracks of the soil. 3) In all years, sorghum roots could penetrate most deeply followed in decreasing order two tropical grasses, corn and soybean, and the soil oxidation was followed by development of root system. On the other hand, the depth of cracks in the soybean fields was deepest. 4) Water absorption from soil by the crops was measured with tensiometer. Sorghum absorped water strongly from lower soil. In bare ground, the soil moisture was kept higher than the ground by cultivation of upland crops.

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