The average manure-recycling ratio is lower than 40% in China, implying that over half of the nutrients in manure are lost to the environment, leading to great pressures on environmental quality. Recoupling crop and livestock production has a big potential to mitigate environmental pollution. The aim of this study is to evaluate the environmental and economic costs and benefits of various spatial manure recycling strategies with the aim to optimise manure recycling in China. We focus on Quzhou city, consisting of six counties, as the study region, being a traditional livestock feeding city, in which manure, mainly of pigs and poultry has a big potential to be recycled. To achieve the above mentioned aim, the research activities in this study include 1) quantifying the spatial variability in crop nutrient demands and manure nutrient supplies under current crop production (base year 2020), 2) assessing the spatial manure nutrient supply and nutrient losses in response to changes in livestock numbers, manure recycling rates manure treatment technologies over the period 2011-2030, 3) quantifying the environmental impacts and economic costs and benefits of different manure recycling modes in terms of crop and livestock farmers’ income and losses of nitrogen (N), phosphorous (P) and greenhouse gases (GHG) to air and water and 4) developing a regional optimisation model to optimised manure allocation strategies considering the costs and benefits, accounting for different subsidy strategies.
|Effective start/end date||1/09/21 → …|
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