A green house experiment was conducted to compare the availability of P and S from Mussoorie rock phosphate (MRP) enriched single (PM I) and double sulphitation press-mud (PM II) with single superphosphate (SSP) at 30 and 60 mg Kg−1 levels of P in mung bean. The results showed that 35.8 and 29.7% of insoluble P from rock phosphate got solubilked and converted into microbial biomass during 8th week of aerobic decomposition of both pressmuds treated with mussoorie rock phosphate (MRP) in the ratio of 8:1. The application of MRP enriched single sulphitation pressmud to sandy loam soil, gave singificantly higher yield of grain and straw of mung bean over MRP enriched double sulphitation pressmud and single superphosphate at both levels of P. The relative uptake of both P and S was also found higher with MRP enriched single sulphitation pressmud. The status of available P and SO4-S in the soil after harvest of the crop increased with application of pressmud either in any form but the highest concentration remained again with MRP enriched single sulphitation pressmud.
