A Brief Study On Using PHH2O To Predict PHKCl For Acid Soils

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Agricultural Sciences > Vol.10 No.2, February 2019 A Brief Study on Using pHH2O to Predict pHKCl for Acid Soils Anqi Wang1,2, Decheng Li1*, Biao Huang3, Yin Lu4 1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.2University of the Chinese Academy of Sciences, Beijing, China.3Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nan-jing, China.4College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China. DOI: 10.4236/as.2019.102012 PDF HTML XML 1,414 Downloads 6,516 Views Citations

Abstract

pHKCl and pHH2O are two basic necessary indexes to reflect the acidity of asoil. Predicting pHKCl directly from pHH2O could save the cost of laboratory work. In this study, the values of pHKCl and of 442 and 310 horizon samples from 126 and 98 soil profiles (0 - 120 cm in depth) surveyed from 2014 to 2015 in Guangxi and Yunnan were used to establish the optimal correlation model between pHKCl and pHH2O. The results showed that: 1) pHKCl is lower than pHH2O, pHKCl was 0.07 - 1.99 units with a mean of 0.99 units lower than for Guangxi, while 0.03 - 1.90 units with a mean of 0.89 lower than pHH2O for Yunan. 2) There is significant positive correlation between pHKCl and pHH2O, the optimal correlation models between pHKCl (y) and pHH2O (x) for Guangxi and Yunnan are y = 0.1963x2

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