Minimizing phosphorous sorption and leaching in a tropical acid soil using Egypt rock phosphate with organic amendments
2016
Ch'ng, H.Y. | Ahmed, O.H. | Majid, N.M.A.
The study examined changes in the soil phosphorus sorption and desorption, pH buffering capacity, and phosphorus leaching upon application of organic amendments (chicken litter biochar and pineapple leaf residues compost). The phosphorous sorption data were fitted to the Langmuir equation. Results revealed that a phosphorous concentrations of less than 10 mg/L sorbed phosphorous was significantly increased under treatments with organic amendments whereas more phosphorous sorption was increasing phosphorous application rates (10 to 20 mg/L). The decrease in phosphorous sorption was due to the precipitation of exchangeable aluminum and extractable iron at the highly negatively charged humic substances functional group surfaces of the organic amendments. High pH buffering capacities were reported in the treatments with organic amendments at 60 d of leaching was higher than that of the treatment without organic amendments. This effect was due to the low sorption and binding energy of biochar and pineapple leaf residues compost. Amendment of Egypt rock phosphate with biochar and pineapple leaf residues compost imposed high pH buffering capacity and improved phosphorous availability, but did not significantly reduce phosphorous leaching in the acid soil used in this study.
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