Effects of organic matters' application and deep tillage on lowland rice following wheat crop in northern Kyushu fertile plain [Japan]
1989
Manabe, H. (Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Sato, H. | Koya, I.
The problem of "soil productivity" was argued again in the early 1980's, when nationwide poor crops continued, and the importance of "soil productivity" was insisted in this country. From 1984 to 1987, the effects of organic matters application and deep tillage on lowland rice following wheat crop were investigated in fertile lowland in Mizuma, Fukuoka, area. In fertile lowland, grain production efficiency of rice and the yield in a unit area were increased by continuous application of 900 kg/10a of rice straw or 2 ton/10a of barnyard manure and additional improvement of tillage depth of 15 cm rather than 10 cm. At the third to forth rice cropping, the yield increased in the range of 50 to 60 kg/10a, that is 8 to 10% of the control yield. This proportion of increment was higher than that attributed to 2 to 3% of spikelet number increment. The yield increment resulting from continuous application of rice straw or barnyard manure at the third or forth cropping was largely caused by the elevation of ripening ability, and that resulting from improvement of tillage depth was caused by spikelet number increment. It was found that the decrement of spikelet number and yield, resulting from decreasing the amount of nitrogen of basal dressing, was minimized by the improvement of tillage depth of 15 cm
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