Nitrate Leaching from Kentucky Bluegrass Soil Columns Predicted with Anion Exchange Membranes
- Salvatore S. Mangiafico and
- Karl Guillard *
Ideal nitrogen (N) management for turfgrass supplies sufficient N for high-quality turf without increasing N leaching losses. A greenhouse study was conducted during two 27-wk periods to determine if in situ anion exchange membranes (AEMs) could predict nitrate (NO3–N) leaching from a Kentucky bluegrass (Poa pratensis L.) turf grown on intact soil columns. Treatments consisted of 16 rates of N fertilization, from 0 to 98 kg N ha−1 mo−1 Percolate water was collected weekly and analyzed for NO3–N. Mean flow-weighted NO3–N concentration and cumulative mass in percolate were exponentially related (pseudo-R 2 = 0.995 and 0.994, respectively) to AEM desorbed soil NO3–N, with a percolate concentration below 10 mg NO3–N L−1 corresponding to an AEM soil NO3–N value of 2.9 μg cm−2 d−1 Apparent N recovery by turf ranged from 28 to 40% of applied N, with a maximum corresponding to 4.7 μg cm−2 d−1 AEM soil NO3–N. Turf color, growth, and chlorophyll index increased with increasing AEM soil NO3–N, but these increases occurred at the expense of increases in NO3–N leaching losses. These results suggest that AEMs might serve as a tool for predicting NO3–N leaching losses from turf.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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