University of Khartoum

Impact of Organic Residues and Mineral Fertilizer Application on Soil–Crop Systems I: Yield and Nutrients Content

Impact of Organic Residues and Mineral Fertilizer Application on Soil–Crop Systems I: Yield and Nutrients Content

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Title: Impact of Organic Residues and Mineral Fertilizer Application on Soil–Crop Systems I: Yield and Nutrients Content
Author: Rezig, F. A. M.; Elhad, Elsadig A.; Mubarak, A R.
Abstract: A five-season experiment was initiated to study the effects of the recycling of some organic residues on a soil–crop system of a guar–wheat rotation in a sandy clay loam soil located in the semi-arid tropics of Sudan. Treatments included: incorporation of crop residues alone after harvest (Crþ), with (FCrþ) or without (FCr7) inorganic fertilizer, sewage sludge (SS) and humentos (H). Grain yield of wheat in FCrþ and Crþ treatments was significantly higher than that obtained in FCr7 and control plots by *22762% and 1167119%, respectively. When crop residues were incorporated with inorganic fertilizer, the priming effect of crop residues on straw yield (106%) was almost double that of the priming effect of inorganic fertilizer (56%). The sustainable yield index of wheat straw dry matter for the control, crop residue, humentos, inorganic fertilizer, combined fertilizer and crop residue and sewage sludge was 28, 27, 8, 35, 21 and 38%, respectively. In general, N, P and K of straw dry matter (SDM) was in the order of FCrþ 4 FCr74SS4Crþ4H4C. The findings suggest that repeated incorporation of crop residues with inorganic fertilizer and applications of SS could both sustain wheat performance in the dryland ecosystems.
URI: http://khartoumspace.uofk.edu/123456789/25150
Date: 2013


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