University of Khartoum

Impact of Organic Residues and Mineral Fertilizer Application on Soil–Crop System: II Soil Attributes

Impact of Organic Residues and Mineral Fertilizer Application on Soil–Crop System: II Soil Attributes

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Title: Impact of Organic Residues and Mineral Fertilizer Application on Soil–Crop System: II Soil Attributes
Author: Rezig, F.A.M.; Mubarak, A.R.; Ehad, Elsadig A.
Abstract: The effects of crop residues alone (Crþ) or combined with inorganic fertilizer (FCrþ) sewage sludge (SS) and humentos (H) on soil properties were studied in a five-season wheat–guar rotation. Incorporation of Crþ and SS significantly decreased pH by 5–9%. Highest organic carbon (OC) was observed in SS plots, whereas Crþ resulted in values threefold that of the control. The added effect of Crþ (46%) combined with fertilizer on total nitrogen (TN) was greater than Crþ by 28%. The fraction of total residue N mineralized was 71%, whereas net N mineralized in Crþ, SS, H and FCrþ plots at 0–20 and 20–40 cm depths were 39.8, 52.3, 11.4, 66.7 mg kg71 and 21.2, 27.9, 8.2, 41.2 mg kg71, respectively. Integrated application of Crþ with fertilizer had a synergistic effect on P content (3.49–3.69 units), but soil levels has never exceeded 13 mg P kg 71. Sole Crþ significantly increased topsoil cation-exchange capacity (CEC) compared with the control treatment (9.39–21.59%). Application of SS, FCrþ and Crþ significantly increased water-holding capacity and decreased bulk density by 9–15% and 8–9%, respectively, suggesting that such practice can restore the productivity of degraded soils and improve crop yields.
URI: http://khartoumspace.uofk.edu/123456789/25151
Date: 2013


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