当前在新修梯田上作试验，由于缺乏田间设计规范，成果误差偏大，影响推广应用。
Due to insufficient specifications for field design, the result obtained from experiments of newly built terraces has a bigger error, effecting popularization and application.
最后通过遗传优化得到所要求的最优的喷头组合间距，借以指导喷灌系统的田间设计工作。
In the end, get the best combinatorial space between through ga optimize to supervise design work in field of sprinkler irrigation system.
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.
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