Improvement of lime alkaline paddy field soil, 2: Improvement of lime alkaline paddy field in Kawara area [Japan] by soil dressing
1989
Toyoda, M. (Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Nagao, T.
The soil of lime alkaline paddy field in Kawara showed pH values of 8.0 to 9.0, the highest, and 7.0 to 8.0 around factories and their outer periphery, respectively. Such kind of soil contained an excess amount of lime and was in poor condition generally for the growth of paddy rice. Therefore, we tried to improve the lime alkarin field by soil dressing. Thertiary shale uncultivated soil (pH 4.80) and granite uncultivated soil (pH 5.6 to 5.8) were dressed into the paddy field to decrease the pH value and lime content, but an expected result was no decreases in the used field due to its higher lime content. When the former soil was dressed in tertiary shale uncultivated soil stepwisely, the pH value just after soil dressing became 7.5 or less as the increase in an amount of soil mixed thereinto. Alter the mixed soil was air dried, a pH value of 7.0 or less was achieved at a soil dressing rate of 90%, while it increased over 8.0 at 80% or less. This indicates that much more amount of soil dressing is necessary to improve the pH value of alkaline soil. Though the growth and yield of paddy rice in improved field decreased because of its poorer capability, basal application and top dressing at formation stage in amount of 50 to 100% and 10 to 50%, respectively, gave a normal yield
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