Poa trivialis Overseeding Rates on FloraDwarf and Tifdwarf and the Transitional Spring Growth Response

Grady L. Miller

This study was initiated in the fall to evaluate influence of overseeding rates on stand density and spring transition performance. There seems to be some confusion in the industry in how lighter overseeding rates perform compared to heavier overseeding rates. Most superintendents indicated to me at a fall meeting that they were using rates between 10 and 25 pounds of Poa trivialis seed per thousand square feet. Superintendents rationalized that with higher rates, the plants stay immature and then transition better in the spring. This research was designed to evaluate plant performance at various overseeding rates. Both Floradwarf and Tifdwarf bermudagrasses will be overseeded for additional transition comparisons. At this time the data processing has not been completed. Preliminary data from one replication is graphed below. The trend toward higher plant density with higher seeding rates is evident in the top graph. As the number of plants increased (bottom graph), there was a decrease in the number of tillers per plant. Obviously, the added shoot density reduced the plant’s ability to put out more tillers. Additional information on this project will be available later this spring.