Dr. N.K. RanaJanardan Prasad2024-07-082024-07-081999https://krishikosh.egranth.ac.in/handle/1/5810211594. Bulk of the residual in neid soil unavailable Lime or organic manure application plant- help maintain high amount of phosphorus in plant available form in such soils. 2. Residual value of single large application of rockphosphate in acid soil was comparable to direct effect of DAP for at least sir crops grown continuously. 3. Soils initially high in available Pean withstand P- depletion due to cropping better than soila with lot medium available status.EnglishThesis