Nitrate-nitrogen (NO3-N) accumulated in the soil during the spring, summer, and fall of a fallow year. NO3-N levels in the surface 6 inches in fall, 1967 and 1968, were similar and averaged 43 lb./acre on the atrazine fallow, 27 lb./acre on the mechanical fallow, and 5 lb./acre on the check. Above average precipitation during the winter of 1968-69 resulted in less NO3-N in spring, 1969 compared to spring, 1968. A comparison between the 2 years at one location showed the following NO3-N levels in the surafce 6 inches: spring, 1968-atrazine fallow 30 lb./acre, mechanical fallow 29 lb./acre, and check 13 lb./acre; spring, 1969-atrazine fallow 5 lb./acre, and check 2 lb./acre. 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.