Methods for an investigation of urea-N loss in Arizona agriculutral waters due to urease activity

Persistent Link:
http://hdl.handle.net/10150/191651
Title:
Methods for an investigation of urea-N loss in Arizona agriculutral waters due to urease activity
Author:
Fitch, Alanah,1953-
Issue Date:
1977
Publisher:
The University of Arizona.
Rights:
Copyright © 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.
Abstract:
Four different methods were analyzed for the study of N loss from aqueously applied urea due to urease activity in irrigation waters. The Watt and Chisp method was found to be less sensitive than required. The Douglas and Bremner Test was found to be variable in the results obtained. A bubbler constructed for lab use assayed nitrogen volatilized from urease activity but is not adaptable for field studies. An acid trap designed for field studies lacked accuracy. Two tests of six different Arizona agricultural waters both revealed no urease activity. The results obtained with the Douglas and Bremner Test must be interpreted carefully since the urease may have been inactivated by the buildup of end products of the urea decomposition reaction.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Urease.; Urea as fertilizer.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Soils, Water and Engineering; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Stroehlein, Jack L.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleMethods for an investigation of urea-N loss in Arizona agriculutral waters due to urease activityen_US
dc.creatorFitch, Alanah,1953-en_US
dc.contributor.authorFitch, Alanah,1953-en_US
dc.date.issued1977en_US
dc.publisherThe University of Arizona.en_US
dc.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.en_US
dc.description.abstractFour different methods were analyzed for the study of N loss from aqueously applied urea due to urease activity in irrigation waters. The Watt and Chisp method was found to be less sensitive than required. The Douglas and Bremner Test was found to be variable in the results obtained. A bubbler constructed for lab use assayed nitrogen volatilized from urease activity but is not adaptable for field studies. An acid trap designed for field studies lacked accuracy. Two tests of six different Arizona agricultural waters both revealed no urease activity. The results obtained with the Douglas and Bremner Test must be interpreted carefully since the urease may have been inactivated by the buildup of end products of the urea decomposition reaction.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshUrease.en_US
dc.subject.lcshUrea as fertilizer.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineSoils, Water and Engineeringen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairStroehlein, Jack L.en_US
dc.identifier.oclc213330863en_US
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