Full TGIF Record # 62826
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Ebdon, J. S.; Petrovic, A. M.; White, R. A.
Author Affiliation:University of Massachusetts and Cornell University
Title:Interaction of nitrogen, phosphorus, and potassium on evapotranspiration rate and growth of Kentucky bluegrass
Section:Turfgrass science
Other records with the "Turfgrass science" Section
Meeting Info.:Salt Lake City, UT: October 31 - November 4, 1999
Source:1999 Annual Meeting Abstracts [ASA/CSSA/SSSA]. Vol. 91, 1999, p. 123.
# of Pages:1
Publishing Information:[Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America
Keywords:TIC Keywords: Nitrogen; Phosphorus; Potassium; Evapotranspiration rate; Evapotranspiration; Growth; Poa pratensis; Application rates; NPK ratio; Shoot growth; Clipping weight
Cultivar Names:Majestic
Abstract/Contents:"Research is limited concerning the interactive effects of nitrogen (N), phosphorus (P), and potassium (K) on turfgrass evapotranspiration (ET) rate. Previous research has emphasized the influence of N on growth and ET. In this study, a central composite experimental design was used to investigate the interactive effects of N, P, and K on Kentucky bluegrass (Poa pratensis L. 'Majestic') water use and growth under field conditions. Using five treatment levels for each nutrient, N treatment levels ranged from 49 to 588 kg ha⁻¹ yr⁻¹, P from 0 to 86 kg ha⁻¹ yr⁻¹, and K from 0 to 348 kg ha⁻¹ yr⁻¹. Clipping yield and ET (measured using 25 cm diam. bucket-type lysimeters) were recorded on a weekly basis. A field study conducted in 1988 evaluated N, P, and K applied alone while in a 1989 field study N-P-K combinations and interactions were evaluated. Applied alone, P and K had no effect on ET or shoot growth independent of the rate applied. Unless a high level of N was applied (588 kg ha⁻¹ yr⁻¹), N had no affect on shoot growth or ET. Shoot growth (clipping yield) and ET were highly correlated (r=0.79, p≤0.001) in the single nutrient study. There was an interaction between N, P, and K on shoot growth and ET. Shoot growth response was highly correlated with ET response when fertilized in the normal range of P for the soil type evaluated (0, 21.5, 43 kg P ha⁻¹ yr⁻¹). Evapotranspiration rate response to N, P, and K applied in combination were distinctly different from nutrients applied alone. At medium to high levels of N and P (294 kg N and 43 kg P ha⁻¹ yr⁻¹ and higher), water use increased in response to increasing K applied. Conversely, at N and P levels routinely applied to this species and soil type (147 kg N and 21.5 kg P ha⁻¹ yr⁻¹ and lower), increasing K levels minimized water use. Further research is needed to study specific interactions."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ebdon, J. S., A. M. Petrovic, and R. A. White. 1999. Interaction of nitrogen, phosphorus, and potassium on evapotranspiration rate and growth of Kentucky bluegrass. Annu. Meet. Abstr. 91:p. 123.
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