SHIVRAN, P L, I P S AHLAWAT, and D R SHIVRAN. 2014. “Productivity, Nutrient Uptake and Soil Fertility As Influenced by Phosphorus and Sulphur in Pigeonpea (Cajanus Cajan )-Wheat (Triticum Aestivum) Cropping System *”. The Indian Journal of Agricultural Sciences 71 (12). https://epubs.icar.org.in/index.php/IJAgS/article/view/40513.