Abdul-El-kader, A. A., Shaaban, S.M. and Abdul- El- Fattan, M.S. (2010). Effects of irrigation and organic compost on okra plants (Abelmoschus esculentus I.) grown in sandy cancerous soil. Agricultural Biology Journal of North America. 1(3): 225-231.
 Abou El-Magd, M.A., El-Bassiony, M. and Fawzy, Z.F. (2006). Effect of organic manure with or without chemical fertilizer on growth, yield and quality of some varieties of Broccoli plants. J. of Applied Science Res., 2(10): 791-798.
 Adeleye, E. O., Ayeni, L. S. and Ojeniyi, S. O. (2010). Effect of poultry manure on soil physico-chemical properties, leaf nutrient contents and yield of yam (Dioscorea rotundata) on Afisol soil in South Western Nigeria. Journal of American science, 6(10): 871-878
 Akanbi, W.B., Akande, M.O. and Adediran, J.A. (2005). Suitability of composted maize straw and mineral nitrogen fertilizer for tomato production. J. of Veg. Science. 11(1): 57-65.
 Akande, M. O., Oluwatoyinbo, F. I., Adediran, J. A., Buari, K. W. and Yusuf, I. O. (2003). Soil amendments affect the release of P from rock phosphate and the Development and yield of okra. Journal of Vegetable Crop Production. 9 (2):3–9
 Ayuso, M., J. A. Pascual, C. Garcia and T. Hernandez, (1996). Evaluation of Urban Waste for Agricultural Use. Soil Science Plant Nutrition, 42: 105-111.
 Babatola, L. A and Olaniyi, J.O (1999). Effect of N P K 15:15:15 level and plant spacing on performance and shelf-life of okra. Annal of Agricultural Sciences. (1): 24-29.
 Dademal, A.A., Dangale, J.H. and Mhaskar, N.V. (2004). Effect of manures and fertilizers content and uptake of nutrients by okra on laterilic soil of konkan. J. soils and crops. 14 (2): 262-268.
 Emeberi, L.C., Obiefuna, J.C., Abaniyi, M.S.C. and Ikpor, M.N. (1992). Growth, yield and yield components response of three okra cultivars (Abelmoschus esculentus) to nitrogen fertilization in humid tropics Acta Horticultural. 30(11): 47-58.
 Ibrahim, L., Amau, A. and Abubakar, I.U. (2002). Gowth indices and yield of tomato (Lycopersicon esculentus) Varieties as influenced by crop spacing at Samaru. Proccedings of the 8th Annual Conference of Horticultural Society of Nigeria. 40-47 p.
 Ibrahim, U. and Hamma, I. L. (2012). Influence of Farmyard Manure and Weeding Regimes on Growth and Yield of Okra (Abelmoschus esculentus L. Moench) in, Zaria. World Journal of Agricultural Sciences. 8 (5): 453-458.
 Katung, M.D., Olanrewaju, J.D. Gupta, U.S. and Kureh, I. (1996). Fruit and Seed yields of okra as influenced by Farm yard manure and Nitrogen fertilizer. In:Proc. 14th HORTSON Conf; Ago-Iwoye, 1 -4 April, 1996.
 Makinde, E.A., Agboola, A.A. and Oluwatoyinbo, F.I. (2001). The effects of organic and inorganic fertilizers on the growth and yield of maize in maize / melon intercrop. Moor journal of Agricultural Research. 2:15-20.
 Musa, M., Bashir, K. A., Tadda, S. A. (2017). Response of cowpea (vigna unguiculata l.
 Walp) varieties to phosphorus levels in Sudan savanna of Nigeria. International Multidisciplinary Research Journal. 7: 23-29.
 Ogunwale, J. A. (2003). Soil phosphorus and phosphate fixation. Third in the series, Faculty of Agriculture, University of Ilorin, Nigeria. 20 p.
 Olaniyi, J.O., Ogunrinde, J.O., Olabode, O.S. and Akanbi, W.B. (2005). Effect of organic mineral fertilizer Application on growth, yield and nutrient uptake of Maize. Journal of Applied Agricultural and Apicultural Research. 2(1):10-19.
 Oshunsanya, S.O. (2011). Improving the physical properties of a degraded alfisol in Nigeria using organic amendments for profitable okra production. Nigerian journal of Soil Sci-ence. 21 (2): 90-94.
 Prabhu, M., Veeraraghavathatham, D. and Srinivasan, K., (2003). Effect of nitrogen and phosphorus on growth and yield of brinjal hybrid COBH-1. South Indian Hortic., 51 (6): 152-156.
 Rajshree, M., Wandile, Maya, M., Raul, Swati, V. Washimakar and Bharti, S. B., (2005). Residual effect of long-term application of N, P, Zn and FYM on soil properties of Vertisols, yield, protein and oil content of soybean. J. Soils and Crops, 15(1): 155- 159.
 Senjobi, B. A., Peluola, A. C., Senjobi, C. T., Lawal, I. O. and Salam, B. T. (2010). Performance of Cochorus olitorius as influenced by soil type and organic manure amendments in Yewa North Local Government Area, Ogun state. African journal of Biotechnology, 9(33): 5309-531.
 Smil V. (2000). Phosphorous in the Environment National flows and Human interferences. Annual Review of Energy and Environment. 25: 53:88.
 Smith, M.A.K., Tolorun, T. P. and Aneji, O. S. (2001). Effect of combine mulch and fertilizer on weed growth and okra (Abelmoschus esculentus L. Moench) yield in the humid tropical environment, Proceedings of the 35th annual conference of the Agricultural society of Nigeria, University of Agriculture Abeokuta, Sep. 16-20, 2001, 43-50 p.