AuthorCordell, Susan Chapman.
Nitrates -- Environmental aspects.
Soils -- Leaching.
Cotton -- Irrigation.
Committee ChairWatson, Jack
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractA field experiment was conducted for the purpose of analyzing the movement of water fronts and NO3-N leaching. A four-acre irrigated cotton field was divided into 12 sections with 2 plots in each. Each section represented a unit in an randomized complete block design, using two N treatments, two irrigation treatments and two samples sites. Cl⁻ and Br were used as conservative tracers to measure depth of water movement. At the conclusion of the growing season, twenty-four 10 ft. soil cores were removed from the field and analyzed for concentrations of NO3-N, Cl⁻ and Br⁻. Correlations existed between 15-bar water-holding capacity and chloride concentrations. The depth of the bromide front was significantly greater (p<5%) for the 70% irrigation efficiency than for the 90% efficiency. The concentration of nitrate-N below 5 feet was significantly lower for the 70% efficiency than for the 90% efficiency.
Degree ProgramSoil and Water Science