SOOD, ANIL, I M CHHIBBA, V K VERMA, P K SHARMA, and V K NAYYAR. 2014. “Soil-Fertility Constraints in Different Physiographic Units in Aridic Areas of Bathinda, Punjab”. The Indian Journal of Agricultural Sciences 72 (6). https://epubs.icar.org.in/index.php/IJAgS/article/view/40890.