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Cool-Season Turfgrass Color and Growth Calibrated to Leaf Nitrogen

^a Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521
^b Dep. of Plant Science, Unit 4067, Univ. of Connecticut, 1376 Storrs Rd., Storrs, CT 06269-4067

View larger version (26K): [in this window] [in a new window]   Figure 1. Deviations from plateau turfgrass clipping yield, Commission Internationale de l' Eclairage (CIE) hue, and CM1000 in relation to leaf N concentration for a mixed cool-season species lawn in Connecticut. Data are pooled from 10 sample dates across two growing seasons. Linear plateau models are shown. Critical conc. and vertical lines to the x axes indicate critical concentrations from linear plateau models. Gray boxes on the x axes indicate the extent of approximate 95% confidence intervals for the critical concentrations. Number of observations per plot is indicated by n.

View larger version (25K): [in this window] [in a new window]   Figure 2. Mean turfgrass clipping yield, Commission Internationale de l' Eclairage (CIE) hue, and CM1000 in relation to leaf N concentration for greenhouse grown Kentucky bluegrass (Poa pratensis L.). Clipping yield, CIE hue, and CM1000 data are averaged from 24 sample dates across two growing seasons, and leaf N was determined on samples composited from 24 sample dates across two growing seasons. Linear plateau models are shown. Critical conc. and vertical line to the x axis indicate critical concentrations from quadratic plateau models. Gray boxes on the x axes indicate the extent of approximate 95% confidence intervals for the critical concentrations. Number of observations per plot is indicated by n.

View larger version (36K): [in this window] [in a new window]   Figure 3. Leaf N concentration in relation to N fertilizer application rate for a mixed cool-season species turfgrass lawn in Connecticut by sample date. N was applied in 6 mo each growing season, May through October, for a total of between 0 and 587 kg ha–1 yr–1. Linear plateau models are shown for sample dates for which significant (p < 0.05) models were found. Plateau indicates the plateau value from linear plateau models. On sample dates for which a satisfactory linear plateau model could not be found, a significant linear model is shown.

View larger version (19K): [in this window] [in a new window]   Figure 4. Leaf N concentration in relation to N fertilizer application rate for a greenhouse grown Kentucky bluegrass (Poa pratensis L.) turf. Leaf N was determined on samples composited from 24 sample dates across two growing seasons. N was applied in 6 mo each growing season, May through October, for a total of between 0 and 587 kg ha–1 yr–1. A linear plateau model is shown. Plateau indicates plateau value from linear plateau model.