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AN APPLICATION OF POLYNOMICAL STEP-REGRESSION OPTIMUM MODEL IN THE STUDY OF PLANT-SOIL CORRELATION IN TIANTONG,ZHEJIANG,CHINA SELECTING ON THE OPTIMUM MODEL OF HARVESTING AND SKIDDING OPERATION IN CUTTING AREA IN OUR COUNTRY′S SOUTHERN COLLECTIVE FOREST REGIONS Optimum models for eco-agriculture in north Shandong Province-A case study from Matou Village,Zouping County