UPENDRA VERMA and O.P. RAJPUT, “ Effect of N, P and K on productivity and soil fertility in pearlmillet (Pennisetum glaucum)-wheat (Tritkum aestivum) cropping system”, IJA, vol. 44, no. 3, p. 44_3 , Oct. 2001, doi: 10.59797/ija.v44i3.3540.