Effects of agrochemicals and wastes on soil environment and food safety Effect of agrochemicals and bio-control productions on soil nematode community dynamics Effects of Tobacco Garlic Crop Rotation and Tobacco Garlic Crop Intercropping on Soil Agrochemical Characters and Tobacco Yield APPLICATIONS OF ISOTOPIC TRACER IN ANALYSIS OF RESIDUAL SULFONYLUREA HERBICIDE BEHAVIOR OF ~(137)Cs IN SOILS AND POTASSIUM COUNTERMEASURES Response of soil nematode community to excessive application of agrochemicals The Use of Agrochemicals in Liaoning Province