But in practical operating, the quantity and the timing of fertilization and irrigation can not be controlled exactly and optimally.
但是在实际操作中灌溉量、施肥量与灌溉和施肥的时机都不容易实现最优化控制。
Irrigation timing is important due to light rather shallow soils.
由于土壤轻松，土层又浅，及时灌溉是很重要的。
IlThe subsystem of autumn irrigation decision-making management included two aspects of forecasting irrigation quota and irrigation timing.
秋浇决策预报子系统包括秋浇灌水定额和灌水时间预报两个方面。
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