说明:本文2008-10-20在CCTA2008上宣读,全文发表于会议论文集: Shang Songhao, Mao Xiaomin. Data Envelopment Analysis on Efficiency Evaluation of Irrigation-Fertilization Schemes for Winter Wheat in North China . In: Li D., Zhao C. (eds.). Computer and Computing Technologies in Agriculture II, Vo ...