SHASHI PAL SINGH, VINAY SINGH, and RhM LAKHAN, “ ~ f f e c t of phosphorus and farmyard manure application on yield, content and uptake of nitrogen, phosphorus and sulphur by potato (Solanum tuberosum)”, IJA, vol. 41, no. 4, p. 41_4 , Oct. 2001, doi: 10.59797/ija.v41i4.3719.