細粒質褐色低地土に生成した耕盤層が土壌水分動態およびテンサイ根系発達に及ぼす影響

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The effect of tillage pan formation on the growth of sugar beet was studied in the fine-textured Brown lowland soils with texture of SiC or SiCL. Chemical and physical properties of soils, soil water potential and sugar beet root distribution in the early, middle and latter growth periods were measured for each soil type of fine-textured Brown lowland soil with texture of SiC or SiCL, medium-textured Brown lowland soil, Andosol and Wet Andosol. Physical properties of soils were favorable in the order of medium-textured Brown lowland soil, Andosol, Wet Andosol and fine-textured Brown lowland soil. On the other hand, chemical properties of soils were favorable in the order of fine-textured Brown lowland soil, medium-textured Brown lowland soil, Andosol and Wet Andosol. It was clarified from the changes in soil water potential and percentage of gaseous phase that the movement of soil water in the fine-textured Brown lowland soil was controlled to a larger extent by the percentage of the pore filled with gravitational water than that in the other soils. Therefore, the decrease in the percentage of pore filled with gravitational water due to the formation of tillage pan is considered to influence to the deterioration of drainage and to the restriction of water uptake by the crop root. Root penetration in the early growth period showed no significant difference among soil types, where the root was distributed in the plowed layer. In the middle growth period, the root penetrated to the plowed layer and middle layer in the fine-textured Brown lowland soil. In the other soils, the root was distributed below the middle layer. In the latter growth period the root in the fine-textured Brown lowland soil penetrated below the middle layer. The growth and yield of sugar beet were the worst defective in the fine-textured Brown lowland soil. The growth in the middle growth period influenced the growth in the latter growth period. It is considered that, in fine-textured Brown lowland soil, soil water environment was deteriorated and the root penatrartion was restricted due to the formation of tillage pan. Therefore, the water uptake by root was suppressed until the middle growth period due to the deteriorated soil water condition. As a result, it is considered that the formation of tillage pan is responsible for the inferior growth and yield of sugar beet in the fine-textured Brown lowland soil.
日本ペドロジー学会の論文
1999-06-30

細粒質褐色低地土に生成した耕盤層が土壌水分動態およびテンサイ根系発達に及ぼす影響

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