Effects of Humic Acid on Livestock Manure and/or Crop Straw Compost
The increase of livestock manure and/or crop straw production in our country poses serious challenges to agricultural development and ecological environment.Composting is an effective way to resource,harmless,and low-carbon livestock manure and/or crop straw.However,traditional composting technology has problems such as slow composting process,significant nutrient loss,and excessive emission of harmful gases.Therefore,in practice,external substances are often added to improve composting efficiency.Humic acid is used in livestock manure and/or crop straw composting due to its structure containing various active functional groups such as carboxyl,hydroxyl,methoxy,amino,carbonyl,etc.,which enable it to have adsorption,complexation,chelation,ion exchange and other functions.In this paper,the effects of humic acid on composting of livestock manure and/or crop straw were summarized from five aspects:reducing nitrogen loss,passivating heavy metals,accelerating composting process,promoting composting humification,and improving the removal efficiency of antibiotic resistance genes.The main effects of humic acid on composting of livestock manure and/or crop straw were summarized,in order to provide reference for the application of humic acid in composting.
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