3Adam C A.Relations between PH,clay,organic matter and CEC and heavy metal concentrations in soils and tobacco[J].Tobacco Science,1989,33:96-100.
4Carter M R.Soil quality for sustainable land managemement:Organic matter and aggregation interactions and maintal soil functions[J].AgronomyJotual,2002,94:38-47.
5Collins W K.Principles of Flue-cured Tobaceo Production[M].North Carolina:State University Press,1993:24-86.
6Janardhan K V.Nitrogen and Potassium nutrition of flue-euredtobaeco in transitional light soils of Kamataka[J].Potassium Research,1989(5):164-170.