Circular Economy in Vietnam’s agriculture, the Potential Substitute of Chemical Fertilizers by Animal Wastes and Crop Residues

Mai Van Trinh

Objectives of study is to calculate the potential of plant nutrients from animal wastes and crop residues. Animal population data was collected from Ministry of agriculture and Rural development report and crop residue data were collected by Institute for Agricultural Environment project of current use of crop residues. Annual amount of equivalent fertilizers can be calculated from massive wastes and residues from the current agricultural production. Crop residues contain equivalent to 43.40 million tons of organic matter, 1.86 million tons of urea, 1.68 million tons of single super phosphate and 2.23 million tons of potassium sulfate, while animal wastes contain the equivalent of 42 million tons of organic matter, 1.20 million tons of urea, 3.10 million tons of single super phosphate and 2.40 million tons of potassium sulfate. In total, wastes and residues from both sub-sectors contain an equivalent of 85.40 million tons of organic matter, 3.06 million tons of urea, 4.78 million tons of single super phosphate and 4.63 million tons of sulfate potassium. However, the current used wastes and residues are very low, not taking advantage of resources, causing emissions, and polluting the environment. The circulation of these wastes and residues needs to have a combination of both crops, livestock sides and aquaculture as well as other kinds of agricultural production. Some current practices of circular systems are production of organic fertilizers from animal wastes and crop residues, incorporate rice straw into the soil, stove gasification and carbonization for renewable energy and biochar, organic agriculture and circulated farm. These practices showing many advantages of effectively use animal wastes and crop residues for agricultural production to reduce environmental pollution, enhance soil fertility, generate clean energy and reducing synthetic fertilizers as well as reducing GHG emission.

Keywords: Animal wastes, crop residues, fertilizers, sustainable farming.