以实际蒸发蒸腾量、有效降雨量和土壤贮水量来预报未来灌水时间。
It is based on actual evapotranspiration capacity, effective rainfall and water reserve of soil to forecast irrigation time.
这个有效的样例应用程序可以用来比较两个城市的天气数据，具体方法是在LotusSymphony电子表格图表中以图形的方式显示平均降雨量数据。
This nontrivial sample application can be used to compare climate data for two cities through the visualization of their average rainfall data as graphs in a Lotus Symphony spreadsheet chart.
并在此基础上，以光合有效辐射、温度和降雨量作为气候指标，分析了它们与牧草长势之间的关系。
On this basis, this paper takes effective photosynthesis radiation, temperature and rainfall as climatic indexes, and analyzes their relations with pasture growth.
在黄土丘陵区要求林草与农作物地在轮作周期内的总耗水量与有效雨量（降雨量与径流深之差）持平。
It is necessery that the total consumptive use of water in the rotation period is equal to the total effective precipitation(pre- cipitation minus runoff depth)in the loess hilly region.
在黄土丘陵区要求林草与农作物地在轮作周期内的总耗水量与有效雨量（降雨量与径流深之差）持平。
It is necessery that the total consumptive use of water in the rotation period is equal to the total effective precipitation(pre- cipitation minus runoff depth)in the loess hilly region.
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