Three s-triazine herbicides (atrazine, simazine, and cyanazine) applied annually at 1.1 and 3.4 kg/ha to shortgrass range in northcentral Colorado, consistently increased protein concentration in range herbage for 3 years, 1970-72. Overall, herbage yields were not affected. Spring applications were slightly more effective than fall applications. Atrazine and simazine were about equally effective. However, herbage treated with simazine retained protein better into fall and winter than that treated with atrazine. Cyanazine was the least effective. Increases in protein from the three herbicides were additive to increases from N fertilizer applied at 22 and 45 kg N/ha, except in a drought year. During drought, 3.4 kg of atrazine or simazine combined with 45 kg N reduced herbage yields and yields of protein. The most practical treatment was a combination of 1.1 kg simazine and 22 Kg N/ha. Averaged over 3 years, this combination increased protein concentration 43% and yield of protein 35% in September. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.