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Nitrogen Increases Evapotranspiration and Growth of a Warm-Season Turfgrass

School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia

View larger version (27K): [in this window] [in a new window]   Fig. 1. Influence of N rate on dry matter produced (kg dry clippings ha–1 wk–1) for (a,b) younger and (c,d) older Kikuyu turfgrass in (a,c) 2005–2006 and (b,d) 2006–2007 summers. The values are for 10 m2 plots for the weeks during which evapotranspiration (ET) measurements were also taken using lysimeters in the plots, with means (and standard errors as bars) of three values. Growth measured as dry mass of clippings, at a cutting height of 15 mm. The LSD for comparing treatments with time in 2005–2006, 38 (except when comparing means with the same turfgrass age and N rate, then use 28); LSD for comparing treatments with time in 2006–2007, 96 (except when comparing means with the same turfgrass age and N rate, then use 62). Note different vertical scale in part d.

View larger version (15K): [in this window] [in a new window]   Fig. 2. Influence of N supply on dry matter production (average weekly clippings) for younger and older Kikuyu turfgrass in (a) 2005–2006 and (b) 2006–2007. The values are for 10 m2 plots for the weeks during which evapotranspiration (ET) measurements were also taken using lysimeters in the plots, with means (and standard errors as bars) of three values. Growth measured as dry mass of clippings, at a cutting height of 15 mm. Note different vertical scales.

View larger version (15K): [in this window] [in a new window]   Fig. 3. The relationship beUtween growth and daily evapotranspiration (ET) for Kikuyu turfgrass during (a) 2005–2006 and (b) 2006–2007 summers. Values represent the average weekly growth of turfgrass plots for the week during which ET measurements were taken, and the average daily ET for each lysimeter. Growth measured as dry mass of clippings, at a cutting height of 15 mm. Daily ET measured using weighing lysimeters installed in turfgrass plots. Note different horizontal scales.

View larger version (14K): [in this window] [in a new window]   Fig. 4. The relationship between (a) green leaf dry mass and daily evapotranspiration (ET) and (b) green leaf area and daily ET for Kikuyu turfgrass in the final week of the 2006–2007 measurements. Leaves collected from lysimeters with a surface area of 330 cm2. Values represent the ET for each individual lysimeter. The open symbol is an outlier and not included in the regression analysis.