Effect of Vermicompost and Molasses on the Phosphorus Adsorption Characteristics of Cow Dung Amended Soil
Keywords:
Cow dung amended soil, molasses, vermicompost, phosphorus adsorption capacityAbstract
Long term but steady-control release of phosphorus is crucially important for phosphorus fertiliser management and plant growth. In the present study, we aimed to explore the effects of vermicompost and molasses on the phosphorus adsorption characteristics of cow dung amended soil. To achieve this goal, four treatments: control (soil + 10% cow dung), T1: SCV (soil + 9% cow dung + 1% vermicompost), T2: SCM (soil + 10% cow dung + 0.1% molasses), and T3: SCVM (soil + 9% cow dung + 1% vermicompost + 0.1% molasses) with three replicates were investigated. The treatments were incubated for 21 days at room temperature (~30 °C) and the samples were collected at seven days intervals. Phosphorus adsorption behaviour was examined by measuring maximum phosphorus adsorption capacity (MPAC), phosphate bonding energy (PBE) and maximum phosphate buffering capacity (MPBC)with some related physico-chemical parameters e.g., pH, electrical conductivity (EC), organic matter (OM) content. Physico-chemical studies revealed that both vermicompost and molasses have positive impact on pH, EC, and OM confirming the relatively better nutrient availability to plants. Initially, the MPAC values of both vermicompost and molasses amended samples (T1: SCV, T2: SCM and T3: SCVM) showed the highest MPAC (696.18 ± 52.625, 703.94 ± 92.386 and 670.17 ± 33.786 mg/kg respectively) followed by gradual decrease to 436.15 ± 16.346, 448.61± 24.221, and 430.78 ± 6.871 mg/kg respectively with time while cow dung amended control soil showed increasing trend starting from the value 321.52 ± 56.462 to 592.65 ± 53.657 mg/kg. Study of the PBE and MPBC of all amended samples followed the same pattern of change.
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