“EFFECT OF ENRICHMENT BIOCHARE BY NITROGEN AND USED AS SLOW RELEASE FERTILIZER ON NITROGEN AVAILABILITY AND YIELD OF OKRA (Ablemoscus esculentus L. Moench) PLANT” (2022) University of Thi-Qar Journal of agricultural research, 11(1), pp. 94–100. doi:10.54174/utjagr.v11i1.165.