电介质型水分传感器测定栽培基质含水率的标定模型

土壤与基质的理化特性相差较大，土壤水分传感器测定基质含水率时有较大误差，不能直接用于基质含水率测定。为实现栽培基质水分快速检测，在不同配比的基质中采用电介质型EC-5土壤水分传感器进行了适应性测试。试验研究了温度、体积质量和电导率对传感器输出值的影响，采用多项式和线性回归处理方法，建立了基于温度、体积质量影响下的基质含水率标定模型。试验表明，经标定后，EC-5电介质型土壤水分传感器的测定含水率与实际含水率之间有较好的线性关系（R2＞0.9791），且最大误差小于13%，因此，EC-5电介质型土壤水分传感器经标定后可作为基质的快速检测设备。

Calibration method for dectection of matrix water content with dielectric-type moisture sensor

The physical and chemical properties of soil and substrate are different, so the moisture sensors can not be used directly for measuring the substrate moisture due to the great errors. To achieve rapid moisture detection of culture media, dielectric type EC-5 soil moisture sensor was used to make adaptive test with substrate in different proportions. The effect of temperature and bulk density on output value of the sensor was studied. And polynomial and linear regression methods were used to establish substrate moisture calibration models under the influence of temperature and bulk density. The experimental results demonstrated that the data from the EC-5 agreed reasonably well with the actual water content (R2>0.9791). And the maximum average error was less than 13%. Therefore dielectric type EC-5 soil moisture sensor can be successfully used as the rapid detection equipment after calibration in this study.