CollegeofHumanitiesandSocialSciences,NanjingAgrlcuituralUnlversityNanjing210014,P.R.China;
CollegeofHumanitiesandSodalSciences,NanjingUniversityofAeronauticsandAstronautics,Nanjing210003,P.RChina;
instituteofIndustrialDevelopmentResearch,NanjingUniversityofFinanceandEconomy,Nanjing210003,P.R.China;
大豆生产; 中国; 大豆贸易; 播种面积; 粮油流通体制; 大豆价格; 市场供求;