Introductionby Frank Humenik,
Abstract: Historically, animal waste was considered a valuable fertilizer and thus land was applied for sustainable on-farm production of crops and animals. However, with the shift to large production units that relied on grain imports and that had insufficient land for waste application at fertilizer rates, treatment processes that would increase flexibility and reduce amounts of nitrogen and phosphorus became necessary.
Subject Headings: Animals | Fertilizers | Waste management | Sustainable development | Crops | Grain (material) | Soil treatment
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