Integrated Effects of Bio and Mineral Fertilizers and Humic Substances on Growth, Yield and Nutrient Contents of Fertigated Cowpea (Vigna unguiculata L.) Grown on Sandy Soils

Magdi. T. Abdelhamid, E. M. Selim and A. M. EL-Ghamry

Journal of Agronomy 10 ( 1 ): 34 - 39 , 2011