National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China;
National Engineering and Technology Research Center for Red Soil Improvement/Jiangxi Institute of Red Soil Nanchang 331717 P.R.China;
Institute of Plant Nutrition and Environmental Resources Science Henan Academy of Agricultural Sciences Zhengzhou 450002 P.R.China;
Institute of Agricultural Resource and Environment Jilin Academy of Agricultural Sciences Changchun 130033 P.R.China;
San Joaquin Valley Agricultural Sciences Center USDA Agricultural Research Service CA 93648-9757 USA;
Cultivated Land Quality Monitoring and Protection Center Ministry of of Agriculture and Rural Affairs Beijing 100125 P.R.China;
manure incorporation; C/N ratio; soil types; grain yield;