Influence of biosolids application on growth, nitrogen uptake, and photosynthesis of two desert grasses

dc.creatorMata-Gonzalez, Ricardo
dc.date.available2011-02-18T19:06:07Z
dc.date.issued1999-12
dc.degree.departmentRange Scienceen_US
dc.description.abstractThis research is an evaluation of the effects of different rates and dates of biosolids application, as well as irrigation levels on biomass production, nitrogen absorption, and gas exchange characteristics of blue grama {Bouteloua gracilis) and tobosagrass {Hilaria mutica) in the Chihuahuan Desert, Individuals of blue grama and tobosagrass were transplanted into pots and grown under greenhouse conditions, Biosolids were applied in March (spring application) or Jime (summer application) at rates of 0, 7, 18, 34, and 90 dry Mg ha"'. Plants were irrigated at 40 or 80% soil field capacity. Treatments were combined in a factorial experiment and plants were arranged in a completely randomized block design. Application of biosolids produced an increase in available soil nitrogen, which favored an increase in shoot biomass of blue grama and tobosagrass. As biosolids rates and irrigation levels increased, biomass allocation increased in the shoots of the grasses. As biosolids rates and irrigation levels decreased, biomass allocation to the roots increased. Spring application of biosolids promoted greater soil nitrogen availability and higher plant growth than summer application of biosolids. Biosolids promoted higher nitrogen uptake and higher nitrogen concentrations in the shoots. Higher plant nitrogen concentrations were particularly favored by biosolids application when irrigation was not a limiting factor. Plant nitrogen concentrations were not strongly correlated with photosynthetic rates in both species. Leaf area, nitrogen concentrations, and photosynthesis rates in tobosagrass irrigated at 80% field capacity increased as biosolids rates increased. Increasing rates of biosolids in tobosagrass under the low irrigation level and in blue grama irrespective of irrigation level produced increases in leaf area, which corresponded with decreases in stomatal conductance and photosynthetic rates. Except for tobosagrass at high levels of irrigation, blue grama and tobosagrass seemed to have a mechanism of stomatal regulation to avoid excessive water loss in response to increments in leaf area.
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2346/9411en_US
dc.language.isoeng
dc.publisherTexas Tech Universityen_US
dc.rights.availabilityUnrestricted.
dc.subjectSewage sludge as fertilizer -- Case studiesen_US
dc.subjectChihuahuan Desert (N.M.)en_US
dc.subjectTobosa grassen_US
dc.subjectCrops and nitrogenen_US
dc.subjectPlants -- Photorespirationen_US
dc.subjectPlants -- Effect of sewage onen_US
dc.subjectBlue grama grassen_US
dc.subjectGrowth (Plants)en_US
dc.titleInfluence of biosolids application on growth, nitrogen uptake, and photosynthesis of two desert grasses
dc.typeDissertation
thesis.degree.departmentRange Science
thesis.degree.departmentNatural Resources Management
thesis.degree.disciplineRange Science
thesis.degree.grantorTexas Tech University
thesis.degree.levelDoctoral
thesis.degree.namePh.D.
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