P. RAMESH, N. R. PANWAR, and A. B. SINGH, “Crop productivity, soil fertility and economics of soybean (Glycine max), chickpea (Cicer arietinum) and blond psyllium (Plantago ovata) under organic nutrient management practices”, Indian J Agri Sci, vol. 80, no. 11, Nov. 2010, doi: 10.56093/ijas.v80i11.1725.