The dynamic of the agricultural soil water is the key issue to regulate the crop water requirement.
农田土壤水分动态是作物需水管理的关键。
Crop coefficient is the basic parameter for determining crop water requirement.
作物系数是计算作物需水量必不可少的参数。
The synthetic crop coefficients are evaluated by analyzing the experiment data on water requirement of rice in plastic film mulched dryland (RPFMD).
分析了覆膜旱作水稻需水量试验资料，得出覆膜旱作水稻各生育阶段综合作物系数。
Based on the analysis of field experimental data, crop water requirement and crop coefficient of straw-mulched summer maize are evaluated with dual coefficient approach recommended by FAO.
采用FAO推荐的双作物系数法计算了秸秆覆盖条件下夏玉米的作物系数。
Based on the data collected in this study, net irrigation water requirement of main crop in china has been gotten.
根据收集到的资料，计算得出全国主要作物的净灌溉需水量。
Spatial variation of crop water requirement was studied basis on the geo-statistics.
基于地统计学方法分析了灌区作物需水量的空间变异性。
It is pointed out that the worsening of soil moisture states inthe level terraced fields cover two parts, i. e. the decrease in soil moisture storage rate, and increase in crop water requirement;
指出，水平梯田水分状况的恶化包括蓄墒率的减小和作物需水量的增大两部分；
In other time crops coefficient between the two crops of change, it is to produce a crop of the main reason rop water requirement.
在其他时间里作物系数均在两种作物系数之间变化，这是产生作物需水量降低的主要原因。
Crop water requirement is not only an important factor for water resource management, but also a major reference for the irrigation planning.
作物需水量的掌握不但是水资源规划利用的重要因子，更是拟定灌溉计划的依据。
Then by analysing the relationship between crop climatic yield and precipitation we obtained the water requirement index in different growth durations.
用降水与分离的气候产量进行回归分析得到需水量，进而评价其满足程度。
Then by analysing the relationship between crop climatic yield and precipitation we obtained the water requirement index in different growth durations.
用降水与分离的气候产量进行回归分析得到需水量，进而评价其满足程度。
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