论述了作物需水量的概念及其计算模式。
The concept of crop water requirements was discussed, based on which the calculation model of crop water requirements was established.
作物系数是计算作物需水量必不可少的参数。
Crop coefficient is the basic parameter for determining crop water requirement.
作物需水量估算是实施农业灌溉管理的重要环节之一。
To estimate crop water requirements is one important part of agricultural irrigation management.
基于地统计学方法分析了灌区作物需水量的空间变异性。
Spatial variation of crop water requirement was studied basis on the geo-statistics.
要进行科学、高效的灌溉管理，必须准确地计算和预测作物需水量。
In order to carry through scientific and efficient irrigation management, crop water requirements must be calculated and forecasted accurately.
提供了作物需水量计算、灌水定额计算，并且介绍了各种灌水方法。
The system provides calculation of crop evapotranspiration and irrigation quota, and introduces many irrigation methods.
分析了现有作物需水量测定方法与计算方法在我国应用于灌溉预报时的局限性。
The present measuring and computing methods of crop water requirements have some limitations when they applied to irrigation prediction in China.
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；
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;
分析了现有作物需水量测定方法与计算方法在我国应用于灌溉预报时的局限性。
Research advance for the real-time irrigation technology based on the crop water requirements;
在田间条件下，设计作物需水量时还应考虑地表径流和水分的渗漏与下渗的情况。
Under field conditions, surface runoff, water infiltration, and drainage should be taken into consideration when designing water demand for crops.
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。
Crop water requirement is not only an important factor for water resource management, but also a major reference for the irrigation planning.
将优选出的模型应用于疏勒河灌区的作物需水量预测，为灌区作物灌溉提供指导。
The optimized model is applied to predict the crop water requirements of Shulehe irrigation area to provide guidance for crop irrigation in the irrigation area.
结果表明，在生育期内浑蒲灌区参考作物需水量的变化规律表现为先增大后逐渐减小。
The results showed that the reference crop evapotranspiration in Hunpu irrigation district increased first and then decreased gradually.
评述了作物需水量的计算，并着重分析了基于参考作物蒸发蒸腾量计算作物需水量的方法。
This paper reviewed the methods for computing crop water requirements and emphasized the method based on reference crop evapotranspiration.
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。
In other time crops coefficient between the two crops of change, it is to produce a crop of the main reason rop water requirement.
单作物系数法比双作物系数法简单，建议在进行生育期作物需水量计算时采用单作物系数法；
Single crop coefficient approach is simpler than dual crop coefficient approach. It is suggested to using single crop coefficient approach for calculating crop water requirements of growth stages.
从作物需水量的基本概念出发，以水量平衡原理为基础，建立了模拟农田根层土壤水循环的计算机模型- IS AREG。
ISAREG is an irrigation scheduling simulation model based on the concept of crop water requirements and soil water balance.
许多人试图通过减少灌溉频率或改种需水量更少的作物来节约用水。
Many have been attempting to conserve water by irrigating less frequently or by switching to crops that require less water.
因此，许多农场主让土地休耕，或不再种植棉花一类需水量大的作物，而改种那些需水量更小的作物。
As a result, many farmers are letting their fields lie fallow or switching from thirsty crops, such as cotton, to those that need less.
人类理所当然地认为使用水是人与生俱来的权利，所以亚利桑那州的市镇广场上公共喷泉还冒着泡、那里农民们选择种植需水量大的农作物。
But such is the human inclination to take water as a birthright that public fountains still may bubble in Arizona's town squares and farmers there raise thirsty crops.
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。
The synthetic crop coefficients are evaluated by analyzing the experiment data on water requirement of rice in plastic film mulched dryland (RPFMD).
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。
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。
Based on the data collected in this study, net irrigation water requirement of main crop in china has been gotten.
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