organic manur

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Shehata, S. A., A. A. Hassan, A. A. Tawfik, and M. F. Farag, "Influence of commercial biofertilizers; organic manure, nitrogen and phosphorus minerals fertilizer on growth and yield of potato (Solanum tuberosum, L.)", .). Annals of Agric. Sci. Moshtohor,, vol. 3, issue 44, pp. 1095-1113., 2006.