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Effect of Paraquat on the Nitrogen Content and Regrowth of Coastal Bermudagrass (Cynodon dactylon (L.) Pers.)¹

The nitrogen content and regrowth potential of 'Coastal' bermudagrass (Cynodon dactylon) was investigated following treatment with paraquat. Two rates of fertilizer, 73.7 kg /ha and 1.5 kg/ha, were applied before paraquat application. Five weeks later paraquat was sprayed at the rate of 0.45 kg/ha.

Grass samples were collected at intervals and freezedried, and nitrogen content was determined. Regrowth was evaluated as height and number of new shoots developed from cut stubble of paraquat-treated plants.

High nitrogen fertilizer applications significantly increased the nitrogen content of Coastal bermudagrass. When these plants were sprayed with paraquat, loss of nitrogen occurred less rapidly than in control plants. Seven weeks following paraquat treatment, the number of shoots produced in regrowth was only about half that of controls. However, there was no difference in the total fresh weight. These results suggest the possibility of using high rates of nitrogen fertilization and the subsequent curing of foliage with paraquat to maintain protein content for an extended period.

Key Words: fertilizer rate • protein • bleaching • field drying • curing

Received for publication April 13, 1967.