Hu, Wei, Lei Zhang, Binglin Chen, and Zhiguo Zhou. “Quantitative Evaluation of Soil Ion Content Using an Imaginary Part Model of Soil Dielectric Constant”. Scientia Agricola 76, no. 4 (April 17, 2019): 299-304. Accessed November 12, 2019. http://www.journals.usp.br/sa/article/view/157012.