STUDIES ON THE MINERALIZATION OF P AND S IN CONCENTRATED ORGANIC FERTILIZER IN ANAEROBIC CONDITION UNDER LABORATORY INCUBATION

Abstract

Having a comprehensive comprehension of the process by which nutrients are released from manure or compost after being applied through mineralization is crucial in order to ensure that the nutritional requirements of crops are fulfilled, to ensure the timely application of fertilizers, and to improve the efficiency of nutrient utilization. The current study was done at the laboratory of the Department of Soil Science of Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur, Bangladesh to study the mineralization of N and S in concentrated organic manures in anaerobic condition under laboratory incubation. In this experiment, T1= Mustard oil Cake, T2= Fish meal, T3= Bone meal, T4= Biochar enriches organic fertilizer, T5= Vermicompost and T6= control was used as treatments. The physicochemical properties of the available P and available S, pH and EC was assessed by standard protocol. The mineralization study was performed under anaerobic conditions for 180 days at 25 0C in the laboratory. The release of P, S, pH and EC showed significant variation in anaerobic conditions. The mustard Oil cake exerted the highest S, P, pH and EC release under anaerobic conditions. pH release vary among the treatments over the study periods. Fish meal gave the second highest result in most of the cases. However, appropriate organic manures should be chosen and applied in the proper quantity to provide exact amounts of essential nutrients, to increase crops nutrient use efficiency and to formulate correct fertilizer recommendations for getting maximum use of different organic manures.