Mohamad M. A. H. and Manal F. Tantawy ( 2012). Effect of partial replacement for mineral fertilizers with biogas manure on soil properties, fertility and productivity of sweet potato Minufiya J. Agric. Res. Vol.37 No. 6(2):1583-1596 (2012)
Abstract: A field experiment was carried out at Experimental Farm Barrage, Horticultural Res. Inst., Agric. Res. Center, through two successive grown seasons of 2011 and 2012 to study the effect of partial replacement for mineral fertilizers by biogas manure on soil physical and chemical properties and its content of available macro and micronutrients. Several vegetative, tuber roots, yield parameters and chemical and mineral composition of sweet potato (Ipomoea batata L.), Minufiya 6/96 cv. were determined. The obtained data showed that:-
The increase of added biogas manure was associated by decrease of soil bulk density, pH and the content of CaCO3 and increase of soil total porosity, EC (dS m -1), CEC, the content of OM and available macro and micronutrients, except available N which increased with the increase of added mineral nitrogen. Also, the high values of the measured vegetative, tuber roots and yield parameters were resulted obtained from the treatment of 50 % mineral fertilizers + 50 % biogas manure. Except tuber roots content of N and protein, the contents of total carbohydrates, total sugar, carotein, vitamin C, P and K of tuber roots were increased with the increase of added biogas manure.
Keywords: (Sweet potato, Mineral fertilizer, Biogas manure, Soil properties, Growth , yield parameters Chemical , mineral composition. )
