Studies on the response of various crops to four major nutrients on a volcanic-ash soil in Kuroishibaru.

Dei, Y.; Fukumoto, U.; Obama, S.

Bull. Kyushu agric. Exp. Sta 5: 193-211


Accession: 014210596

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Volcanic-ash soil of andesitic origin supplied nutrients in the order: K <P <N <Ca. Supplies of soil K decreased rapidly during cultivation. Upland rice and sweet potato as summer crops were least responsive to fertilizers. Responses of soyabeans and millet were negligible to N, marked to K and moderate to P and Ga. Wheat, buckwheat and rape as winter crops showed higher response to fertilizers than summer crops did.