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29 March 2018 Feldspathic sandstone addition and its impact on hydraulic properties of sandy soil
Junchao Jia, Pingping Zhang, Xiaofeng Yang, Xingchang Zhang
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Feldspathic sandstone could be used as an effective conditioner to improve the physical quality of sandy soil, and increase the crop yield there. To determine the effects of feldspathic sandstone content on soil hydraulic properties in a sandy soil, the present study added 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% (no sandy soil) of feldspathic sandstone to sandy soil. Changes in hydraulic parameters were investigated and the results showed addition of feldspathic sandstone increased saturated water content by 37%–61% and field capacity by 29%–44%, and decreased saturated hydraulic conductivity from 10.19 to 0.58 cm h-1 of the sandy soil. Further data analysis demonstrated that with increasing content of feldspathic sandstone, the parameter n of soil water retention curve in Van Genuchten model dropped from 1.807 to 1.333. The same decreasing trend is detected in parameter a of infiltration rate (3.841–0.703) in Kostiakov formula (i = at-b) and parameter a1 of wetting front (6.901–1.174) in the empirical equation (X = a1tb1). In terms of hydraulic parameters, 40% feldspathic sandstone and 60% sandy soil, optimally matching indices of loess soil, were the best mixing ratio for sandy land restoration.

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Junchao Jia, Pingping Zhang, Xiaofeng Yang, and Xingchang Zhang "Feldspathic sandstone addition and its impact on hydraulic properties of sandy soil," Canadian Journal of Soil Science 98(3), 399-406, (29 March 2018).
Received: 6 October 2017; Accepted: 5 March 2018; Published: 29 March 2018

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feldspathic sandstone content
hydraulic properties
propriétés hydrauliques
sandy lands
teneur en grès feldspathique
terres sablonneuses
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