Khan, M. N. ., Afridi, G. S. ., Bibi, H. ., Shah, H., & Taj, S. . (2019). Evaluation of a Training Program on Soil Fertility and Crop Yield Improvement Techniques: Soil Fertility and Crop Yield Improvement Techniques. Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences, 56(1), 57–65. Retrieved from http://ppaspk.org/index.php/PPAS-B/article/view/186