Decomposition of roots and nodules of centrosema pubescens benth

A modified technique involving incubation of moistened Serdang Series soil samples with segments of radicle and lateral roots as well as portions of nodules of Centrosema was used to study release of nitrogen into the soil as well as the biology of decompositon of roots and nodules of this legum...

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Main Author: Hashim, Azizah
Format: Thesis
Language:English
English
Published: 1979
Subjects:
Online Access:http://psasir.upm.edu.my/id/eprint/8540/1/FSAS_1979_1_IR.pdf
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spelling my-upm-ir.85402023-12-07T01:42:02Z Decomposition of roots and nodules of centrosema pubescens benth 1979-07 Hashim, Azizah A modified technique involving incubation of moistened Serdang Series soil samples with segments of radicle and lateral roots as well as portions of nodules of Centrosema was used to study release of nitrogen into the soil as well as the biology of decompositon of roots and nodules of this legume. The samples were incubated for various lengths of time under optimum temperature and moisture content. At weeks 0, 1, 2, 4 , 8, 12 and 16, the respective soil samples were cleared of undecomposed legume tissues and analysed for total N, ammonium, nitrate, organic carbon and soil pH. At the same time the extracted laterals, radicle and nodule tissues were respectively plated on Czapek-Dox and potato dextrose agar media for isolation and enumeration of the decomposer mycoflora. The amount of ammonium nitrogen released from the different soil treatments was much higher than the levels of nitrate nitrogen released throughout the experiment. This could probably be due to the slightly acidic nature of the soil media used. The organic carbon content however decreased with increase in incubation time. This ultimately reSUlted in the narrowing of the C/N ratio to < 10 for all treatments under study. Accumulation of the ammonium nitrogen in the soil apparently resulted in the slight increase in soil pH. Soils amended with nodules varied significantly for all analyses when compared to the other treatments. The number of decomposer mycoflora isolated from the three tissue types increased with advanced tissue decay. For all the three tissue types used: laterals, radicles and nodules, five fungal genera were isolated frequently throughout the sampling period. The different gen era isolated were Fusarium, Trichoderma, Curvularia, Gliocladium and Penicillium. Total number of fungal genera and total isolates from decaying nodules were significantly higher when compared to results obtained from either decaying laterals or radicles. Roots (Botany) 1979-07 Thesis http://psasir.upm.edu.my/id/eprint/8540/ http://psasir.upm.edu.my/id/eprint/8540/1/FSAS_1979_1_IR.pdf text en public masters Universiti Pertanian Malaysia Roots (Botany) Faculty of Science Waid, J. S. English
institution Universiti Putra Malaysia
collection PSAS Institutional Repository
language English
English
advisor Waid, J. S.
topic Roots (Botany)


spellingShingle Roots (Botany)


Hashim, Azizah
Decomposition of roots and nodules of centrosema pubescens benth
description A modified technique involving incubation of moistened Serdang Series soil samples with segments of radicle and lateral roots as well as portions of nodules of Centrosema was used to study release of nitrogen into the soil as well as the biology of decompositon of roots and nodules of this legume. The samples were incubated for various lengths of time under optimum temperature and moisture content. At weeks 0, 1, 2, 4 , 8, 12 and 16, the respective soil samples were cleared of undecomposed legume tissues and analysed for total N, ammonium, nitrate, organic carbon and soil pH. At the same time the extracted laterals, radicle and nodule tissues were respectively plated on Czapek-Dox and potato dextrose agar media for isolation and enumeration of the decomposer mycoflora. The amount of ammonium nitrogen released from the different soil treatments was much higher than the levels of nitrate nitrogen released throughout the experiment. This could probably be due to the slightly acidic nature of the soil media used. The organic carbon content however decreased with increase in incubation time. This ultimately reSUlted in the narrowing of the C/N ratio to < 10 for all treatments under study. Accumulation of the ammonium nitrogen in the soil apparently resulted in the slight increase in soil pH. Soils amended with nodules varied significantly for all analyses when compared to the other treatments. The number of decomposer mycoflora isolated from the three tissue types increased with advanced tissue decay. For all the three tissue types used: laterals, radicles and nodules, five fungal genera were isolated frequently throughout the sampling period. The different gen era isolated were Fusarium, Trichoderma, Curvularia, Gliocladium and Penicillium. Total number of fungal genera and total isolates from decaying nodules were significantly higher when compared to results obtained from either decaying laterals or radicles.
format Thesis
qualification_level Master's degree
author Hashim, Azizah
author_facet Hashim, Azizah
author_sort Hashim, Azizah
title Decomposition of roots and nodules of centrosema pubescens benth
title_short Decomposition of roots and nodules of centrosema pubescens benth
title_full Decomposition of roots and nodules of centrosema pubescens benth
title_fullStr Decomposition of roots and nodules of centrosema pubescens benth
title_full_unstemmed Decomposition of roots and nodules of centrosema pubescens benth
title_sort decomposition of roots and nodules of centrosema pubescens benth
granting_institution Universiti Pertanian Malaysia
granting_department Faculty of Science
publishDate 1979
url http://psasir.upm.edu.my/id/eprint/8540/1/FSAS_1979_1_IR.pdf
_version_ 1794018765529153536