Direct and residual effects of mussoorie rock phosphate applied in conjunction with pyrites or super phosphate in maize wheat zea mays triticum aestivum rotation on submontane soils

Mishra, B.; Mishra, N.P.; Sharma, R.D.

Indian Journal of Agricultural Sciences 50(9): 691-697


ISSN/ISBN: 0019-5022
Accession: 005164475

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In field trials the response of maize (Z. mays Linn.) to Mussoorie rock phosphate was poor, but spectacular improvement in its efficacay occurred when it was mixed with pyrites in 1 + 2.5 ration. A mixture of Mussoorie rock phosphate and superphosphate in equal proportion on total P basis was 83.1% as effective as superphosphate in 1974 and 62.4% as effective in 1975 for increasing the grain yield of maize. In regard to residual effect on wheat (T. aestivum Linn. emend. Thell.) the differences among P sources were much less compared with direct effect on maize. Mussoorie rock phosphate mixed with pyrites or superphosphate was comparable with superphosphate in terms of the response of grain yield of wheat during both years. Mussoorie rock phosphate alone was significantly inferior to other 3 P sources tested.