AS  Vol.10 No.2 , February 2019
A Brief Study on Using pHH2O to Predict pHKCl for Acid Soils
Abstract: pHKCl and pHH2O are two basic necessary indexes to reflect the acidity of asoil. Predicting pHKCl directly from pHH2could 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 pHH2for Yunan. 2) There is significant positive correlation between pHKCl and pHH2O, the optimal correlation models between pHKCl (y) and pHH2(x) for Guangxi and Yunnan are y = 0.1963x2 &minus; 1.0512x + 4.338, R2 = 0.836, p < 0.01 and y = 1.5882e0.1859x, R2 = 0.769, p < 0.01, respectively, and the values of MAE and RSME of the models are 0.13 and 0.36 for Guangxi, 0.08 and 0.28 for Yunnan, respectively. There are significant negative correlations between pHKCl with exchangeable H+ and Al3+ (R2 = 0.487, 0.716, p < 0.01), and pHKCl is dominated by exchangeable Al3+, followed by exchangeable H+, and their contribution to pHKCl were 71.1% and 28.7%, respectively.
Cite this paper: Wang, A. , Li, D. , Huang, B. and Lu, Y. (2019) A Brief Study on Using pHH2O to Predict pHKCl for Acid Soils. Agricultural Sciences, 10, 142-149. doi: 10.4236/as.2019.102012.

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