Crop Science Journal of Natural Resources and Life Sciences Education
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Published online 20 May 2008
Published in Crop Sci 48:1178-1186 (2008)
© 2008 Crop Science Society of America
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Phosphorus Requirements of St. Augustinegrass Grown in Sandy Soils

Min Liua, J.B. Sartainb,*, L.E. Trenholmc and G.L. Millerd

a College of Resources and Environment Science, China Agricultural Univ., Beijing, China, 100094
b Soil and Water Science Dep., Univ. of Florida, 414 Newell Hall, P.O. Box 110510, Gainesville, FL 32611-0510
c Environment Horticultural Dep., Univ. of Florida, Gainesville, FL 32611-0670
d Crop Science Dep., North Carolina State Univ., Raleigh, NC 27695

* Corresponding author (sartain{at}ufl.edu).

Phosphorus fertilization of St. Augustinegrass [Stenotaphrum secondatum (Walt.) Kuntze] is performed on the basis of soil tests designed for agronomic crops. The objectives of this study were to determine the critical minimum P application rate and soil and tissue P concentration of St. Augustinegrass grown in sandy soils. Three studies were conducted in a glasshouse using a Pomona sand, two Tavares sands, and a Pottsburg sand. Established pots of ‘Floratam’ St. Augustinegrass received P at 0, 0.14, 0.27, 0.54, and 1.09 g m–2 every four weeks for 16 weeks for Study 1 and 12 weeks for Studies 2 and 3. Critical minimum tissue P concentration was determined to be 1.8 g kg–1 on dry weight basis. Minimum P application rate was 0.14 g m–2 4-wk–1 to obtain acceptable turfgrass quality and growth rate. Additional growth was not observed when Mehlich-1 P level was greater than 7, 8, 9, and 5 mg kg–1 for Pomona sand, Tavares sand (a), Pottsburg sand, and Tavares sand (b), respectively. Phosphorus fertilization would not be recommended if soil Mehlich-1 P concentration is above 10 mg kg–1 for sandy soils or tissue P level is beyond 1.8 g kg–1 on dry weight basis. Phosphorus application of 0.14 g m–2 4-wk–1 is recommended when P is required.

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Received for publication December 27, 2007.




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