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2018 | 102 | 173-179
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Phosphorous transformation as influenced by different levels of phosphorous alone and in combination with humic acid

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An incubation experiment was carried out in completely randomized design (CRD) at the laboratory of soil and environmental sciences, the university of Agriculture Peshawar, Pakistan to investigate changes in AB-DTPA extractable soil Phosphorous (P) with the addition of Humic acid (HA) and added P levels as single super phosphate (SSP). Two levels of HA including control (H0: control and H1: 500 g ha-1) and four levels of P as single super phosphate (SSP) including control (P0: control, P1: 60 kg ha-1, P2: 90 kg ha-1, and P3: 150 kg hectare) were utilized. Soil treated with different levels of SSP alone or reinforced with HA showed an initial decline in AB-DTPA extractable P in first 14 days and then rapid mineralization up to 56 days of incubation in the laboratory. HA increased mean available P by 44.93, 16.08 and 7.25 % at 0, 60 and 90 kg P205 ha-1. Weekly turnover of P ranged from 0.19 to 0.43 mg P kg-1 soils for soils treated with different levels of SSP alone or reinforced with HA. HA increased weekly turnover by 40 and 8.82 % at 60 and 90 kg P205 ha-1 as SSP respectively. HA applied alone or reinforced with 60 and 90 kg P205 ha-1 increased mean available P, weekly turnover of P as well as mineralization potential.
Physical description
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