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中文摘要：
运用比较优势理论,选取了11种作物作为天津市代表性作物。根据天津市1956-2000年45年长系列气象资料、当地作物系数及Penman-Monteith公式,逐日计算天津市代表性作物需水量。确定出各代表性作物可利用的有效降水量,并得出天津市耕地年综合ET值为524 mm。从作物需用水特征和作物比较优势分析,将天津市代表性作物分为4类：重点发展的作物为葡萄、玉米和棉花;维持现有种植规模,重点提高单产的作物为向日葵;根据水情适当压缩种植面积的品种为冬小麦;而水稻、大豆、高粱和瓜类仅在特别需求和受土地条件限制时种植。
英文摘要：
This paper applies the comparative superiority theory to select 11 kinds of crops as the representative crops in Tianjin. This study calculates the water requirements of crops and the effective precipitation and elicits that the comprehensive field ET of Tianjin is 524 ram. Finally, this article analyses the water use condition and the comparative priority index of each representative crop and classifies the crops as four kinds. Grape, maize and cotton are the significant corps of Tianjin. Heliotrope＇s growth dimensions could be maintained and put emphases on how to increase the output. The growth dimensions of wheat should be compressed. Rice, soybean , broomcorn, fruit tree and melon are the common corps which should not be considered as the key crops to develop in Tianjin.
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