“EFFECT OF ENRICHMENT BIOCHARE BY NITROGEN AND USED AS SLOW RELEASE FERTILIZER ON NITROGEN AVAILABILITY AND YIELD OF OKRA (Ablemoscus esculentus L. Moench) PLANT”, UTJagr, vol. 11, no. 1, pp. 94–100, Aug. 2022, doi: 10.54174/utjagr.v11i1.165.