条件筛选
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Why is the nutrient return rate of livestock and poultry manure to fields in China less than 50%?
Vice Minister of Agriculture Zhang Taolin said on the 23rd that due to the massive use of chemical fertilizers, insufficient rural environmental protection investment and other factors, composting is becoming increasingly rare in rural areas, and the nutrient return rate of livestock and poultry manure to fields in China is now below 50%. Zhang Taolin made the remarks at the 2015 International Composting Conference