Improvement of N. P and K Levels of Liquid Fertilizers made using waste milk & Waste Milk Product Using Wood Ash

Abstract

The utilization of biogas slurryr, a by-product of anaerobic digestion, has gained significant attention for its potential in sustainable agriculture. This study focuses on evaluating the chemical composition, particularly the nitrogen (N), phosphorus (PzOs), and potassium (KzO; levels, of biogas slurry produced from a mixture of cattle waste manure and dairy by-products, including waste mitrk and yogurt. Additionally, the study investigates the impact of incorporating mango wood ash into the slurry at various ratios. The study employs a weighted average approach to calculate the resultant chemical composition of the slurry-wood ash mixtures. At a2:l rctio, the pH increased to 8.07, with N, PzOs, and llzO levels reaching 0.040033%,0.95yo, and0.4l2%y respectively. The 4:l ratio yielded apH of 7.68, N at 0.39%, PzOs at}.2l%o,and KzO at0.28o/o.The 1:0.15 ratio resulted in a pH of 7 .478,N at 0.24o/o, Pzos at 0.018yo, and llzo at 0.r9o/o. This study contributes to the body of knowledge on the use of biogas slurry as an organic ferlllizer by demonstrating how the addition of wood ash can significantly alter its chemical properties. The findings highlight the potential of biogas slurry enriched with dairy by-products and wood ash to enhance soil fertility and support sustainable agricultural practices. Moreover, this research underscores the importance of optimizing the ratios of slurry to wood ash to achieve desired nutrient levels, which can vary based on specific agricultural needs. In conclusion, the integration of waste milk, yogurt, and wood ash into biogas slurry offers a promising approach to recycling organic waste and improving the nutrient profile of organic fertilizers. Future research should focus on long-term field studies to assess the agronomic benefits and environmental impacts of using such enriched biogas slurry in various cropping systems.