“EFFECT OF ENRICHMENT BIOCHARE BY NITROGEN AND USED AS SLOW RELEASE FERTILIZER ON NITROGEN AVAILABILITY AND YIELD OF OKRA (Ablemoscus Esculentus L. Moench) PLANT”. University of Thi-Qar Journal of Agricultural Research, vol. 11, no. 1, Aug. 2022, pp. 94-100, https://doi.org/10.54174/utjagr.v11i1.165.