Ann, Y. C. “DETERMINATION OF THE EFFICIENCY AND EFFICACY OF BIO-CHEMICAL FERTILIZER ON THE SOIL, YIELD AND GROWTH PERFORMANCE OF BLACK PEPPER (Piper Nigrum L.)”. JOURNAL OF ADVANCES IN AGRICULTURE, vol. 4, no. 3, July 2015, pp. 460-8, doi:10.24297/jaa.v4i3.4278.