AL. Makhlof, H. .; Abd El-mawla Mohammed, H.; L. Ahmed, G. Effect of Organic (Biochar, Compost and Chicken Manure) and Mineral Fertilization on Available NPK on Sandy Soil. JOPAS 2019, 18 (4), 86–91. https://doi.org/10.51984/jopas.v18i4.392.