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Aboveground Responses of Cool-Season Lawn Species to Nitrogen Rates and Application Timings

^a Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-2054
^b USDA-ARS, 275 S. Russell St., West Lafayette, IN 47907-2054

View larger version (21K): [in this window] [in a new window]   Figure 1. Rainfall, air, and soil (grass cover, 10 cm) temperatures from September 2003 to December 2005.

View larger version (30K): [in this window] [in a new window]   Figure 2. Kentucky bluegrass mean study dry matter yield and canopy greenness as affected by eight N programs that varied by annual N rate and application timing. Months of application: September (S), October (O) November (N), April (A), May (M), and July (J); annual N rate is in kilograms per hectare.

View larger version (26K): [in this window] [in a new window]   Figure 3. Perennial ryegrass mean study dry matter yield and canopy greenness as affected by eight N programs that varied by annual N rate and application timing. Months of application: September (S), October (O) November (N), April (A), May (M), and July (J); annual N rate is in kilograms per hectare.

View larger version (29K): [in this window] [in a new window]   Figure 4. Turf-type tall fescue mean study dry matter yield and canopy greenness as affected by eight N programs that varied by annual N rate and application timing. Months of application: September (S), October (O) November (N), April (A), May (M), and July (J); annual N rate is in kilograms per hectare.