Direct and residual effect of mussoorie rock phosphate related to the crop species in an acid soil

Marwaha, B.C.; Kanwar, B.S.; Tripathi, B.R.

Journal of the Indian Society of Soil Science 29(3): 349-355


Accession: 005164470

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The response of 2 leguminous (peas and berseem) and 2 non-leguminous (wheat and potato) crops to ground Mussoorie rock phoshpate alone and along with superphosphate, farmyard manure and low grade pyrites or its partial acidation with H3PO4 at 10% in an acidic soil (pH 5.7) is reported. The yield and P uptake in all the crops, except berseem, increased significantly with rock phosphate application, but it proved only 41.6% as effective as superphosphate for potatoes, 32.7% for peas, 23.7% for wheat and 3.2% for berseem. The effectiveness of rock phosphate, however, increased greatly when it was used in conjunction with small amounts of superphosphate or farmyard manure or was partially acidulated with H3PO4, the effect of later treatment being highest and comparable to an equal dose of superphosphate both on the basis of direct and residual effect on crop yields and P uptake. The use of low grade pyrites seems undesirable in acid soils with pH < 6.0. All the phosphatic treatments exhibited considerable residual effect which was proportionately higher than their direct effect. The residual effect of rock phosphate alone was 48.7-74.1% as effective as that of superphosphate for corn and it was highest under berseem and lowest under potatoes.