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Influence of Simazine on Crude Protein and Cellulose Content and Yield of Forage Grasses¹

Conditions evaluated the influence of sub-herbicidal applications of 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine) on the crude protein content and yield of several forage cultivars. In the greenhouse significant increases in percent crude protein and, generally, decreases in both dry matter yield and percent cellulose occurred when ‘Kenwell’ and ‘Kentucky 31’ tall fescue (Festuca arundinacea Schreb.), ‘Climax’ timothy (Phleum pratense L.), common perennial ryegrass (Lolium perenne L.), annual ryegrass (Lolium multiflorum Lam.), an allotetraploid ryegrass (Lolium sp.), and several Lolium-Festuca synthetics were treated with simazine. Significant simazine x cultivar Interactions occurred. Tall fescue gave increased yields of crude protein without sacrificing yields of dry matter. Under field conditions reed canarygrass (Phalaris arundinacea L.), treated at five nitrogen (N) levels — O, 56, 112, 224, and 448 kg/ha — was sprayed with simazine at rates of O, 0.07, 0.14, 0.28, and 0.56 kg ai/ha on two dates. Three harvests were taken. Simazine and N effects were significant (P<0.01) with respect to dry matter yield. Increased levels of crude protein were evident as a result of simazine application in the first harvest and at the high N level in the second. Increased yields of crude protein were obtained at the 224 kg N/ha level as a result of simazine application compared to controls

Key Words: Tall fescue • Timothy • Perennial ryegrass • Annual ryegrass • Reed canarygrass • Cellulose • Nitrates • Sub-herbicidal

² Assistant Professor and Professor of Agronomy, respectively, Department of Plant Science.

Received for publication September 2, 1969.