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Behavior and availability of ammonium in flooded soils / Mongkorn Somsud.

By:

Somsud, Mongkorn [author]

Contributor(s):

Tilo, Santiago N [adviser]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna : 1980. Cavite State University- Main Campus,Description: 80 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

631.4 So5 1980

Online resources:

Click here to view thesis abstract and table of contents

Abstract: SOMSUD, MONGKORN, University of the Philippines at Los Banos, June, 1980. Behavior and Availability of Ammonium in / Flooded Soils. Major Professor: Dr. Santiago N. Tilo The studies were conducted to find out the native fixed-Ni;, the extent and magnitude of ammonium fixation of some Philippine and Thai soils, ammonium volatilization, availability of native fixed-NHy and recovery of applied ammonium in the presence of a growing lowland rice. The values of native fixed-Buy varied from 5 to 200 ppm of nitrogen, there appeared to have no definite trend in the distri of fixed-NH, with soil depths, The amounts of native fixed-NH, were related to the Orders of soil. The amounts of fixation of applied ammonium ranged from 3 to 108 ppm of nitrogen. Oven- drying tended to fix more applied ammonium than air-drying treatment. The average ammonia volatilization ranged from 1.79% to 11.06% and 0.13% to 1.97% of applied ammonium without and with rice plant, respectively. The volatilization was related to the amounts of exchangeable Ca, initial soil pH, and a standing rice crop caused to decrease the volatilization. Volatilization rate was rapid at first, then it slowed down during the second week. Fixation of applied ammonium at different periods of submergence varied from 0.42% to 85.83% and 10 to 17% of applied ammonium without and with a crop, respectively. The fixation decreased with time of submergence. The availability of native fixed-NH, ranged from 2 to 8% and from 5 to 26% without and with rice crop, respectively. Recovery of applied ammonium by the rice plant ranged from 0.7 to 4.2%. The percentages were quite low owing to the immaturity of the plants.

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	631.4 So5 1980 (Browse shelf(Opens below))		Link to resource	Room use only	T-1523		00002365

Thesis (Ph.D. - - Soil Science) University of the Philippines, College, Laguna.

Includes bibliographical references.

SOMSUD, MONGKORN, University of the Philippines at Los Banos, June, 1980. Behavior and Availability of Ammonium in / Flooded Soils. Major Professor: Dr. Santiago N. Tilo

The studies were conducted to find out the native fixed-Ni;, the extent and magnitude of ammonium fixation of some Philippine and Thai soils, ammonium volatilization, availability of native fixed-NHy and recovery of applied ammonium in the presence of a growing lowland rice.

The values of native fixed-Buy varied from 5 to 200 ppm of nitrogen, there appeared to have no definite trend in the distri of fixed-NH, with soil depths, The amounts of native fixed-NH, were related to the Orders of soil. The amounts of fixation of applied ammonium ranged from 3 to 108 ppm of nitrogen. Oven- drying tended to fix more applied ammonium than air-drying treatment.

The average ammonia volatilization ranged from 1.79% to 11.06% and 0.13% to 1.97% of applied ammonium without and with rice plant, respectively. The volatilization was related to the amounts of exchangeable Ca, initial soil pH, and a standing rice crop caused to decrease the volatilization.

Volatilization rate was rapid at first, then it slowed down during the second week. Fixation of applied ammonium at different periods of submergence varied from 0.42% to 85.83% and 10 to 17% of applied ammonium without and with a crop, respectively. The fixation decreased with time of submergence. The availability of native fixed-NH, ranged from 2 to 8% and from 5 to 26% without and with rice crop, respectively. Recovery of applied ammonium by the rice plant ranged from 0.7 to 4.2%. The percentages were quite low owing to the immaturity of the plants.

Submitted to the University Library 01/07/1994 T-1523