Annual Bluegrass Seedhead Emergence as Predicted by Degree-Day Accumulation
1984
Danneberger, T. K. | Vargas, J. M.
Seedhead production of annual bluegrass (Poa annua L.) during the spring reduces annual bluegrass root production and disrupts the aesthetic and playing qualities of the turf. A method of predicting when annual bluegrass seedheads visually emerge through maximum production would be a benefit to turf managers in that management practices such as vertical mowing and core cultivation could be suitably adjusted. A model to predict the number of seedheads from visual emergence through maximum production for a perennial annual bluegrass turf was developed from three field locations in Michigan. The proposed model is seedhead no. = −6249.4 + 41.099 (DD) − 0.08573 DD² + 0.0000575 DD³ where DD = degree-day accumulation above 286 K beginning April (R² = 0.65).
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