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Rice cultivation under the natural farming system without chemicals and farmyard manure. X. Chemical characteristics of the soil and root system formation in rice in well- and poorly-drained paddyfields. A case study in Kumamoto Prefecture



Rice cultivation under the natural farming system without chemicals and farmyard manure. X. Chemical characteristics of the soil and root system formation in rice in well- and poorly-drained paddyfields. A case study in Kumamoto Prefecture



Proceedings of Faculty of Agriculture, Kyushu Tokai University 6: 5-15



In field trials with rice grown without the use of chemicals, grain yields from well-drained fields averaged 459-524 g/msuperscript 2 while poorly-drained fields yielded 269 g. During flooding the soil pH was lower and total soil P and available silica were higher in well-drained than in poorly-drained fields. The root system reached its greatest size sooner and more roots penetrated the subsoil and more crown roots elongated in the well-drained fields.

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