Abstract
Sixteen minilysimeters were used in a study to determine the effect of preconditioning to shade on evapotranspiration (ET) by Kentucky bluegrass (Poa pratensis L. var ‘Merion’). Grass that had been preconditioned to 100, 71, 51, and 27% of possible photosynthetically active radiation (PAR) was subjected to full sun (100% PAR) or full shade (2% PAR) for one day periods. Canopy temperature and ET were measured and compared for grass from differing preconditioning treatments. Live biomass was later clipped, dried and weighed. Dry weight increased by a factor of nearly 3 as pretreatment PAR increased from 27 to 100%. In spite of this difference in the 20 mm high canopy densities, ET and canopy temperature were equal for grasses from all preconditioning treatments when placed in full sun or full shade. It was concluded that ET is not influenced by preconditioning to shade as long as complete ground cover is maintained.
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