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Yield Response of Bermudgrass and Bahiagrass to Applied Nitrogen and Overseeded Clover

Agricultural Engineering Dep., Univ. of Florida, Gainesville, FL 32611
USDA-ARS Southern Piedmont Conserv. Res. Center, Watkinsville, GA 30677
Texas Agric. Exp. Stn., Overton, TX 75684

^* Corresponding author.

Models can be used to describe yield response of grasses to applied N and other management factors. This analysis was performed to show interactions between applied N and overseeded clover on dry matter yield, and to estimate equivalent N supplied by clover. Data from three locations were used. At Watkinsville, GA both ‘Coastal’ and common bermudagrass [Cynodon dactylon (L.) Pers.] were overseeded with crimson clover (Trifolium incarnation L.). At Eagle Lake, TX, both Coastal bermudagrass and ‘Pensacola’ bahiagrass (Paspalum notatum Flugge) were overseeded with ‘Yuchi’ arrowleaf (Trifolium vesiculosum Savi) and 'Mt. Barker* subterranean {Trifolium subterranean L.) clovers. At Jay, PL both Coastal bermudagrass and Pensacola bahiagrass were overseeded with crimson clover. The logistic model described dry matter response to applied N and contained three parameters (A, b, c). It was shown that the presence of clover affected only the b coefficient, which related to yield at zero applied N. It was also shown that overseeded clover provided equivalent N of approximately 120 kg ha^–1 for bermudagrass and 90 to 220 kg ha^–1 for bahiagrass. Most of the increased yield of the bennudagrass-clover combination over bermudagrass without clover was due to the clover production; only about 25 kg ha^–1 of equivalent N was carried over to the bermudagrass under conditions where top growth of clover was removed. The model allows quantitative estimates of equivalent N supplied by clover.

Received for publication December 13, 1991.

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