Soil moisture probabilistic density function 土壤湿度概率密度函数
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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