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利用吉林省中西部21个市县30年(1961～1990年)5～9月份的平均降水量、蒸发量、土壤含水量资料,计算出玉米在生育期内逐月需水量及缺水量,计算了因缺水引起的玉米减产率.并以长春地区为例对不同时段的水分增产潜力进行初步分析.分析结果表明:吉林省中西部地区玉米生育前期大都表现为缺水,但西部地区缺水状况较中部地区更为突出.在这一时期增加该地区土壤的供水能力、可以较大幅度提高玉米产量.图1,表3,表4
By using the data of average precipitation, evaporation and soil water content in 21 cities and counties of central and western Jilin province from January to September from 1961 to 1990, the monthly water demand and water deficit of maize during the growth period were calculated. The rate of corn yield reduction caused by water shortage was calculated and the potential of water potential increase in different periods was analyzed with Changchun as an example.The results showed that most of the early maize growth in central and western Jilin Province was water deficit, Water conditions are more pronounced than those in the central part of the world, where increasing the water supply capacity of the soil during this period can significantly increase the yield of maize Figure 1, Table 3, Table 4