Effect of rock phosphate enriched FYM on wheat (Triticum aestivum L.) -rice (Oryza sativa L.) cropping sequence in an acid alfisol

Thakur, S.K.; Sharma, C.R.; Jagdev Sharma

Himachal Journal of Agricultural Research 25(1/2): 13-18

1999


Accession: 003421077

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Abstract
The direct and residual effect of rock phosphate enriched FYM in a wheat (T. aestivum)-rice (O. sativa) cropping system was studied during 1994-95 and 1995-96. Enrichment of cow dung with rock phosphate at 12.5 and 25.0% significantly decreased water soluble P and increased citrate soluble and total P. Azotobacter inoculation at 30 and 60 days of decomposition significantly increased NH+4, NO-3 and total N. Application of 12.5% rock phosphate enriched FYM at 2.5 t ha-4 produced wheat yield statistically at par with 25.8-38.7 kg P ha-1 as single superphosphate. However, by using 25.0% rock phosphate even higher yield than 25.8-38.7 kg P ha-1, was obtained. Residual effect of both these treatments on rice was similar to residual effect of 38.7 kg P ha-1 as single superphosphate.