3Topp G C, Davis J L, Annan A P. Electromagnetic determination of soil water content: Measurement in coaxial transmission lines [ J ]. Wate Resour. Res. ,1980,16(3) :574 -582.
4Paltineanu I C, Starr J L. Real-time soil water dynamics using muli- tisensor capacitance probes:Laboratory calibration [ J ]. Soil Sci. Soc. Am. J. ,1997,61(6) :1576 - 1585.