Ammonia volatilization from soils with surface rice straw residue /
(NH4)2SO4 VS- urea, and single vs. two equal split
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (NH4)2SO4 VS- urea, and single vs. two equal split (NH4)2SO4 VS- urea, surface broadcast vs. deep placement of activity. Subsurface application of N virtually eliminated affected grain yield. A high urease activity (1 980 mg urea alkaline Lake Charles clay (pH 7.4). The treatments in the and field experiments were conducted to determine the effect applications of the N. The presence of surface straw applied N). The only variable to affect grain yield was the Beaumont field study, but decreased it in the Lake Charles environment for NH3 volatilization of surface-applied N, following variables: surface rice straw vs. no straw, greenhouse and lab consisted of all possible combinations of greenhouse. No variable affected N uptake in the field, in NH3 loss. Factors specific to each field may have in the field consisted of all possible combinations of the increased NH3 loss in all studies on both soils. Urea tended kg-' (pH unit)-') of rice straw created a conducive kg-' hr'), pH (7.2), and H-ion buffering capacity (73 mmol N application method. Split-applied N increased yield in the N, immediate flooding vs. delayed flooding. The treatments NH3 1oss. Generally,a delayed flood increased NH3 loss- NH4+ from deep-applied N before volatilization could occur. of surface rice residue and related factors on NH3 other residue on the soil surface which may enhance NH, particularly urea. Soil CEC's of over 50 cmol kg-' bound possibly due to low NH3 losses in the field (O to 6% of Reduced tillage rice production can result in rice straw and study. Reduction in grain yield was not related to increase Subsurface N application increased N uptake in the the following variables: surface rice straw vs. no straw, to volatilize more than (NH4)2SO4 due to greater straw urease volatilization from an acid Beaumont clay (pH 5.4) and an volatilization of surface-applied N. Laboratory, greenhouse, |
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| Item Description: | "Major subject: Soil Science". Vita. |
| Physical Description: | xv, 114 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |