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10 July 2019 Influence of crop residues and nitrogen fertilizer on soil water repellency and soil hydrophobicity under long-term no-till
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Crop residues and N fertilizer under no-till may increase soil water repellency (SWR) and soil hydrophobicity, but few studies have examined these two treatment factors and their interaction. A laboratory study was conducted using a long-term (since 1999) field experiment on a clay loam soil to determine the effect of three crop residues and two N fertilizer levels on SWR and soil hydrophobicity under no-till within the Dark Brown soil zone of the semi-arid Canadian prairies. The three residue treatments were residues removed from soil (Rx0), residues returned to soil (Rx1), and residues supplemented to soil (Rx2). The two fertilizer N treatments were 0 (N0) and 45 kg N ha-1 (N1). Surface (0–10 cm) soil samples were taken in the spring of 2017 after 17 yr. Laboratory measurements were conducted on air-dried and sieved (<2 mm) soil to determine SWR using the repellency index method (RI), soil organic C, hydrophobic CH and hydrophilic CO functional groups, and soil hydrophobicity (CH/CO ratio). Mean RI values ranged from 2.19 to 2.75, indicating subcritical (RI > 1.95) SWR. Similar (P > 0.05) RI values were found for the three residue and two N fertilizer treatments, but the trend was for greater RI with increased residue addition (by 12%–26%) and N fertilizer (by 8%). Soil hydrophobicity was significantly greater by 47%–82% for straw returned or supplemented than straw removed treatments, and by 33% for fertilized than unfertilized treatments. Overall, greater residues and N fertilizer had no effect on SWR, but significantly increased soil hydrophobicity.

© Her Majesty the Queen in right of Canada 2019. Permission for reuse (free in most cases) can be obtained from RightsLink.
J.J. Miller, M.L. Owen, B.H. Ellert, X.M. Yang, C.F. Drury, and D.S. Chanasyk "Influence of crop residues and nitrogen fertilizer on soil water repellency and soil hydrophobicity under long-term no-till," Canadian Journal of Soil Science 99(3), 334-344, (10 July 2019).
Received: 11 January 2019; Accepted: 26 June 2019; Published: 10 July 2019

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