Improving quality of compost by using rock phosphate, sulphur and sulphur oxidizing bacteria

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Research Paper 01/10/2018
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Improving quality of compost by using rock phosphate, sulphur and sulphur oxidizing bacteria

Ghazanfar Naeem, Tanveer Iqbal, Ghulam Jilani, Arshad Nawaz Chaudhry, Muhammad Rashid Hameed, Muhammad Rasheed, Irfan Ali
Int. J. Biosci.13( 4), 8-17, October 2018.
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Phosphorous (P) is essential macronutrient for plant growth. Pakistani soils are deficient in available P. To overcome this P deficiency enriched compost was prepared by combining different organic and inorganic amendments. Organic amendments included farm yard manure (FYM), green waste (GW) and sulfur oxidizing bacteria (SOB), while inorganic amendments included rock phosphate (RP) and sulfur (S). The aim of this study was to enhance the solubility of RP by composting it aerobically in different combinations with farm yard manure (FYM), green Waste (GW), sulfur (S) and sulfur oxidizing bacteria (SOB). The treatments included control, FYM (80%) + GW (20%), FYM (80%) + GW (20%) + R (4%) and FYM (80%) + GW (20%) + RP (4%) + S (0.5%). There were two sets of above treatments with and without SOB. Compost samples were collected after 30, 60 and 90 days of composting. Parameters to be studied were temperature, EC, pH, total P, Olsen P citric acid soluble P (CSP), water soluble P (WSP), total potassium (K) and total nitrogen (N). Analysis of compost samples revealed higher total P content (4.51%) in   RP amended treatment while higher soluble P content (99 mg kg-1) was recorded in RP + S + SOB. Higher total K content (1.20%) was noted in FYM + GW+SOB and higher total N content (2.53%) was noted in FYM + GW + RP + S + SOB. Addition of S and SOB along with RP proved to be very effective regarding dissolution of RP. The results revealed that P content of final compost can be increased by using suitable amendments.


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