Abstract
A good understanding of nutrient release from manure or compost after application through mineralization is important to assure meeting the nutrient demand of crops, to secure timely fertilizer application and to enhance nutrient use efficiency. The current study was done to evaluate phosphorus (P) and sulphur (S) release patterns from different types of manures viz. cow dung, cow dung slurry, tricho-compost, vermicompost, poultry manure, poultry manure slurry and mungbean residues. The mineralization study was performed under aerobic (field capacity) and anaerobic (waterlogging) conditions for 180 days at 25 ± 1 °C in the laboratory. The release of P and S showed the highest values within 75–180 and 75–150 days, respectively, and was always higher in aerobic conditions than in anaerobic conditions. The first-order kinetic cumulative model was a good fit for mineralization, which was significantly influenced by manure type, soil moisture level and incubation period. Poultry manure slurry exerted the highest P and S release under both moisture conditions. Both slurries showed higher potential mineralization, with a lower rate constant for these elements compared to that in their manure states. Hence, appropriate manures should be chosen and applied in the proper quantity to provide exact amounts of nutrients, to increase crops nutrient use efficiency and to formulate correct fertilizer recommendations.
Highlights
IntroductionAgriculture is a key economic engine in Bangladesh, accounting for 14.23% of the country’s gross domestic product (GDP) [1] and employing 41% of the workforce [2]
The goal of this study was to look at the release kinetics of P and S in soils amended with different organic manures that varied in moisture levels over time, and to see whether these manures could be used as an organic source of nutrient supply and as an alternative to inorganic fertilizers in our farming system
The manures had a wide range of P concentration (0.50%, 1.23%, 2.33%, 2.49%, 1.76%, 0.52% and 0.45% in cow dung (CD), cow dung slurry (CDSL), poultry manure (PM), poultry manure slurry (PMSL), TC, VC and mungbean residues (MR), respectively) (Table 2)
Summary
Agriculture is a key economic engine in Bangladesh, accounting for 14.23% of the country’s gross domestic product (GDP) [1] and employing 41% of the workforce [2] Agriculture in this nation has evolved throughout time, with crop production skyrocketing as a result of new technology, mechanization, increased chemical usage, higher cropping intensity, adoption of contemporary varieties (high-yielding varieties and hybrids) and cultivation of high-biomass-potential crops, among other factors. It is not sufficient to just increase the use of inorganic fertilizers to prevent organic matter depletion and nutrient mining; organic sources of plant nutrients such as cow dung, chicken manure, bioslurry, compost, green manure and other organic sources of plant nutrients are important Organic manures such as crop wastes, animal manure and green manure have a direct influence on soil organic matter content, which can enhance physical, chemical and fertility characteristics; boost microbial activity and reduce metal toxicity through complexation with metals of a contaminated soil [5]. To achieve better and long-term soil fertility and crop output, a strategy of regular organic matter addition and balanced fertilizer management, which includes both organic and inorganic fertilizers, is required
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