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《Winter cover crops in a vegetable cropping system: Impacts on nitrate leaching, soil water, crop yield, pests and management costs》
http://ucce.ucdavis.edu/files/filelibrary/5472/21426.pdf
《Impact of soil health management practices on soilborne pathogens, nematodes and root diseases of vegetable crops》
http://search.nal.usda.gov/bitstream/10113/934/1/IND22068650.pdf