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| dc.contributor.author | Andualem, Misganew | |
| dc.date.accessioned | 2022-04-30T06:16:54Z | |
| dc.date.available | 2022-04-30T06:16:54Z | |
| dc.date.issued | 2021-10 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/13615 | |
| dc.description.abstract | Phosphorus(P) sorption is the main limiting factor for P availability in acidic soils and requires large application of inorganic fertilizers to attain maximum crop yield, which is not environmentally friendly and economically feasible for smallholder farmers. This study was conducted to investigate the effect of vermicompost (VC) and biochar (BC) on P sorption characteristics and chemical properties of Nitisols of Pawe District, Northwestern Ethiopia. Composite surface (0-20cm) soil samples were collected from three villages selected purposively for the study. The experiment had seven treatments consisted of three levels of BC and VC (5,10, and 15 t ha -1 ) and one control laid out in completely randomized design (CRD) with three replications. The effect of BC and VC on soil properties and P sorption characteristics were determined after incubating the samples for 30 days in green house. For sorption study 3g of soil from each sample were equilibrated with 30 ml of 0.1M CaCl 2 solution containing 0,1,5,10,20,30,40, and 50 mg l -1 P as KH 2 PO 4 . The concentration of P in the solution was determined by ascorbic acid method after equilibrating for 24hrs at room temperature. The P-sorption indices were calculated by fitting the data in to Langmuir and Freundlich equations. The result showed the sorption data of soils were fitted well with both Langmuir (r 2 =0.99) and Freundlich (r 2 =0.98) models. Application of BC and VC improves the soil chemical properties, including pH, P, TN, OC, EEC, and exchangeable bases and decreases the exchangeable acidity and exchangeable aluminum. The result also showed the maximum P sorption capacity of soils were increased but the bonding energy (K L ) and maximum buffering capacity (MBC) decreased as the rate of application of BC and VC increased. The external P requirement (EPR) of the study sites were less than 150 mg kg -1 P, and were classified as low P sorbing soils. However, after the addition of BC and VC the EPR of the soil in all sites were decreased. Application of 15 t ha -1 BC better decreased the EPR up to 29.40%. From this study, it can be suggested that application of BC and VC are effective amendments to increase the availability of plant nutrients and decrease the external P fertilizer requirements by alleviating P-fixation problems. The result further indicated the current P fertilizer application rate 20 kg ha -1 P used by farmers across the study area needs to be revised after validating the current finding both in the green house and under field condition. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Soil Science | en_US |
| dc.title | Effects of Organic Amendments on Phosphorus Sorption Characteristics of Nitisols of Pawe District, Northwestern Ethiopia | en_US |
| dc.type | Thesis | en_US |
