水田における滲透性の意義について(第2報) : 滲透速度の差による流出アンモニア量の変化

概要

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The influence of percolating velocity of water stagnated in a paddy soil during a period of paddy planting, on the amount of NH_4 produced in or leached out from a cultivated surface layer was investigated. The greater the percolating velocity, in a certain range, the more the NH_4 was formed or leached out. We consider that there may be the most suitable percolating velocity for the best growth of paddy plants, at which the total amount of produced NH_4 is as enough as the concentration of NH_4 in a percolating water is always higher than a constant concentration caused by the increased percolation to a certain limit. In reference to the above consideration, the concentration of NH_4 seems not to be less than 10 ppm, otherwise the tellering of the plant may be injured. It may be said that a best percolating velocity may be such that water decreases its depth in the range between 2.5 cm and 3.0 cm a day. From the amount of NH_4 leached out from a surface layer to the subsoil and the concentration of NH_4 in the percolating water, we can realize that the significance of permeability or the condition of porosity of soils for the utilization of nutrient in a percolating water by the paddy roots.
社団法人日本土壌肥料学会の論文
1956-05-05