Nashmi Ahmed Hilal and Noor AL-Dean Mohammed 2021. The effect of the type of organic matter and a source of phosphorous on the growth, yield of corn (Zea mays L.) under different levels from phosphorous in gypsum soil. Al-Qadisiyah Journal of Pure Science. 26, 4 (Aug. 2021), 388-404. DOI:https://doi.org/10.29350/qjps.2021.26.4.1434.