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TURFGRASS SCIENCE

Anion Exchange Membrane Soil Nitrate Predicts Turfgrass Color and Yield

Dep. of Plant Science, Unit 4067, University of Connecticut, 1376 Storrs Road, Storrs, CT 06269-4067

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

Desirable nitrogen (N) management practices for turfgrass supply sufficient N for high quality turf while limiting excess soil N. Previous studies suggested the potential of anion exchange membranes (AEMs) for predicting turfgrass color, quality, or yield. However, these studies suggested a wide range of critical soil nitrate-nitrogen (NO₃–N) values across sample dates. A field experiment, in randomized complete block design with treatments consisting of nine N application rates, was conducted on a mixed species cool-season turfgrass lawn across two growing seasons. Every 2 wk from May to October, turfgrass color was assessed with three different reflectance meters, and soil NO₃–N was measured with in situ AEMs. Cate-Nelson models were developed comparing relative reflectance value and yield to AEM desorbed soil NO₃–N pooled across all sample dates. These models predicted critical AEM soil NO₃–N values from 0.45 to 1.4 µg cm^–2 d^–1. Turf had a low probability of further positive response to AEM soil NO₃–N greater than these critical values. These results suggest that soil NO₃–N critical values from AEMs may be applicable across sample dates and years and may serve to guide N fertilization to limit excess soil NO₃–N.

Abbreviations: AEM, anion exchange membrane • CIE, Commission Internationale de l'Eclairage

This article has been cited by other articles:

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