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Spring Growth of Reed Canary grass (Phalaris arundinacea L.) and Climax Timothy (Phleum pratense L.) Under Different Harvesting Systems¹

During the spring of 1965 and again in 1966 measurements were recorded at 2- to 4-day intervals on the growth rate of reed canarygrass and ‘Climax’ timothy as influenced by the residual effect of the previous year's treatments. The 1965 results of these treatments were: reed canarygrass — significantly lower rate of growth when clipped at the 4-cm vs 9-cm height; Climax timothy — no significant difference. The growth measurements recorded in the spring of 1966 reflected the residual influence on spring growth of clipping height as it interacted with plant maturity at the first harvest. Comparing the 4- and 9-cm clipping heights over the maturity stages showed the following: reed canarygrass — slower growh rate at 4- than at 9-cm heights if the first harvest was removed when the growing point was 5, 10 or 20 cm above the soil (Systems 1,2, and 3), but no difference if 30 cm above the soil or heads had emerged (Systems 4 and 5); Climax timothy — slower growth rate at the 9-cm height it the first harvest was removed under Systems 2 or 3, but not under the other systems. Considering only the residual effect of the stage of maturity at which the first harvest was removed, harvesting under System 2 was detrimental to growth of reed canarygrass. No significant effect of management system on growth rate was noted for Climax timothy.

Key Words: Perennial grasses • Growth rate • Clipipng height • Stage of maturity

² Formerly Graduate Assistant (now Assistant Professor of Agronomy at the University of Missouri at Columbia, 65201) and Professor of Agronomy at The Pennsylvania State University.

Received for publication November 23, 1968.