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Growth and Carbohydrate Storage of Three Poa pratensis L. Strains as Influenced by Temperature¹

To determine if Poa pratensis strains of different origins would respond differently to a series of temperatures, ‘Merion,’ ‘0217,’ and ‘Newport’ cultivars were grown in controlled environment growth chambers at four different temperature regimes.

Top growth, density, and total available carbohydrates in stem bases were determined after 8 weeks in the growth chambers. Plants were clipped to 4 cm at weekly intervals during the treatment period.

A differential response to temperature among the three strains was demonstrated. Merion and 0217 had the highest density at the higher temperatures and Newport had the highest density at the lower temperature regimes. The 0217 strain had significantly greater density at all temperatures than did Merion or Newport. All strains accumulated more carbohydrate reserves at the lower temperatures, but Newport had signficantly lower reserves at all temperatures than did Merion or 0217. Only Merion had a significantly greater carbohydrate reserve at the lowest temperature compared to the next warmer regime. Clipping yields were greater at the warm temperatures compared to the cool temperatures for all strains.

Key Words: Kentucky bluegrass • turf • tillering • turf density

² Professor of Agronomy and Laboratory Technician, University of California, Riverside, Calif. 92502.

Received for publication February 17, 1968.

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