The moisture rate of soil above drip tube is higher than which under the drip tube, in vertical soil moisture is related soil depth with a nonlinear function.
滴灌带以下的含水率高于滴灌带以上的含水率，垂直方向含水率的分布与土壤深度之间符合二次函数关系。
The reflected GPS signal as a function of permittivity relates to the soil moisture.
反射gps信号功率是土壤介电常数的函数，而土壤介电常数又和土壤湿度有关。
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