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.
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.
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.
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