Effects of weed control and added nitrogen were evaluated in terms of basal area growth, number of reproductive culms, seed yields, and test weight and germination of seed from individual plants of squirreltail (Sitanion hystrix) and Thurber needlegrass (Stipa thurberiana) from 1974 to 1979. Basal-area growth of Thurber needlegrass plants continued during the study period but at a reduced rate during dry years. Parts of squirreltail crowns died during dry periods. A reduction in competition by weed control and added nitrogen stimulated basal area growth of Thurber needlegrass, enhanced germination of squirreltail seed, and increased the number of reproductive culms and seed yield of both species, particularly in years of high precipitation. Germination of squirreltail was much greater than that of Thurber needlegrass. Results are discussed in relation to community ecology, range improvement practices, and seed production for commerce. 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.