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NUTRIENT MANAGEMENT & SOIL & PLANT ANALYSIS

Nitrate Leaching from Kentucky Bluegrass Soil Columns Predicted with Anion Exchange Membranes

Dep. of Environmental Sciences, Univ. of California, Riverside, CA, 92521

Karl Guillard^*

Dep. of Plant Science, Unit 4067, Univ. of Connecticut, 1376 Storrs Rd., Storrs, CT 06269-4067

^* Corresponding author (karl.guillard{at}uconn.edu).

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-R² = 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.