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The Interrelationship Among Nutrient Elements Applied to Calcareous Sand Greens¹

A field study designed to observe the interacting effects of applied N, P, and K on the growth and quality of creeping bentgrass (Agrostis palustris Huds. ‘Penncross’) was conducted on highly calcareous, experimental, sand greens at Ohio State Univ. in 1977 and 1978. Application rates of N and K ranged from 0 to 10.8 kg/are/year (1 are = 100 m², 1 kg/are is approximately 2 lbs./1,000 ft²) and application rates of P ranged from 0 to 5.4 kg/are/year. Data were also collected on the effects of applied nutrients on a number of soil test measurements. Potassium test levels ranged from 52 to 252 kg/ha after the 2nd year of the study. Increasing rates of N and K interacted in their effect on K soil test levels. Potassium test level in plots receiving 10.8 kg/are/year were 125 kg/ha higher in plots receiving no N than in plots receiving the highest level of applied N. Nitrogen and K were also observed to interact in their effects on tissue growth. At lower levels of applied N, tissue production increased with increasing levels of applied K. At high levels of applied N, tissue growth decreased slightly with increasing levels of K. Evidence is presented which would indicate that Mn may have been limiting to growth at high rates of N and K. Highest tissue chlorophyll content and quality were observed at N application rates of approximately 6 kg N/are/year. This is nearly double the rate normally recommended for greens in temperate regions.

Key Words: Fertility • Agrostic palustris • Turfgrass • Creeping bentgrass

² Graduate research associate, Agronomy Dep., Ohio State Univ., and OARDC (presently assistant professor, Iowa State University, Dep. of Horticulture, Ames, IA); associate professor, Agronomy Dep., Ohio State Univ. and OARDC, (presently Regional Agronomist, ChemLawn Corporation); and assistant professor, Agronomy Dep., Ohio State Univ. and OARDC, respectively.

Received for publication December 18, 1980.

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