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Published online 1 January 2005
Published in Crop Sci 45:259-265 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Turfgrass Reflectance Measurements, Chlorophyll, and Soil Nitrate Desorbed from Anion Exchange Membranes

Salvatore S. Mangiafico and Karl Guillard*

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


Figure 1
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  		Fig. 1. Linear response plateau plots of turfgrass color and yield measurements to NO3–N desorbed from AEMs across two growing seasons. Data are shown for AEMs used in situ at a depth of 0 to 7.6 cm. Vertical lines to the x-axes in the plots indicate the critical level of AEM-desorbed NO3–N, above which there is no change in turfgrass color to increasing AEM-desorbed NO3–N. No linear plateau model is shown for dry matter yield because the model is not applicable.

 

Figure 2
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  		Fig. 2. Mean AEM desorbed soil NO3–N for fall-fertilized treatments versus sampling date. Data is presented for turfgrass across two growing seasons.

 

Figure 3
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  		Fig. 3. Relationships among color measurements on turfgrass across two growing seasons. Linear response plateau models are shown for plots A and B. Power relationships are shown for plots D, E, and F. No model is shown for plot C because no significant model was found.

 




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