Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)

Rhizobia are frequently used in the agriculture sector to enhance legume growth and improve soil fertility. There is growing interest in utilizing biological nitrogen fixation as a means of increasing the potential for sustainable intensification of food production whilst simultaneously reducing env...

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Main Author:	Asilah Abdul Mutalib
Format:	thesis
Language:	eng
Published:	2018
Subjects:	QH Natural history
Online Access:	https://ir.upsi.edu.my/detailsg.php?det=4727
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spelling	oai:ir.upsi.edu.my:47272020-02-27 Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR) 2018 Asilah Abdul Mutalib QH Natural history Rhizobia are frequently used in the agriculture sector to enhance legume growth and improve soil fertility. There is growing interest in utilizing biological nitrogen fixation as a means of increasing the potential for sustainable intensification of food production whilst simultaneously reducing environmental damage caused by overuse of chemical fertilisers. Biochar, a recalcitrant carbon-rich product of pyrolysis which may be added to soil as a fertilizer or as a soil improver, alters soil physico-chemical properties usually by acting as a liming agent, by increasing water holding capacity or by modifying cation exchange capacity. The effects of biochar on the soil microbial community are not fully understood. Therefore, the main aim of this investigation was to evaluate the effects of biochar on the Rhizobium-legume relationship and determine whether biochar could increase legume growth. To achieve this aim, a series of growth experiments were carried out under controlled conditions in which broad bean (Vicia faba) was grown with Rhizobium /eguminosarum and the symbiosis tested against three concentrations of biochar applied as a soil amendment and with two different char particle sizes. Beans responded well to Rhizobium under char-free conditions but the effects of biochar on the symbiosis were variable and depended on char particle size, concentration and Rhizobium strain (commercial or indigenous). Powdered char inhibited plant growth when in the presence of the commercial rhizobia, but not with indigenous strains. This is an important finding since commercial inocula are commonly used in agronomic situations. Plant available soil nutrients were modified by biochar and surprisingly by an interaction between char concentration and the two rhizobia strains. When beans were co-cropped with wheat, beans performed better when grown with powdered char than without. This is in contrast to the response of bean plants to powdered char in the absence of any competition. Since wheat was generally the superior competitor, powdered char amendment enabled the bean to take advantage of the N-limiting environment that powdered char created and perform better than in the soils that advantaged the wheat. The investigation highlighted the complexity of the system, but identified the importance of char particle size and Rhizobium strain selection. 2018 thesis https://ir.upsi.edu.my/detailsg.php?det=4727 https://ir.upsi.edu.my/detailsg.php?det=4727 text eng closedAccess Doctoral Universiti Pendidikan Sultan Idris Fakulti Teknikal dan Vokasional N/A
institution	Universiti Pendidikan Sultan Idris
collection	UPSI Digital Repository
language	eng
topic	QH Natural history
spellingShingle	QH Natural history Asilah Abdul Mutalib Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)
description	Rhizobia are frequently used in the agriculture sector to enhance legume growth and improve soil fertility. There is growing interest in utilizing biological nitrogen fixation as a means of increasing the potential for sustainable intensification of food production whilst simultaneously reducing environmental damage caused by overuse of chemical fertilisers. Biochar, a recalcitrant carbon-rich product of pyrolysis which may be added to soil as a fertilizer or as a soil improver, alters soil physico-chemical properties usually by acting as a liming agent, by increasing water holding capacity or by modifying cation exchange capacity. The effects of biochar on the soil microbial community are not fully understood. Therefore, the main aim of this investigation was to evaluate the effects of biochar on the Rhizobium-legume relationship and determine whether biochar could increase legume growth. To achieve this aim, a series of growth experiments were carried out under controlled conditions in which broad bean (Vicia faba) was grown with Rhizobium /eguminosarum and the symbiosis tested against three concentrations of biochar applied as a soil amendment and with two different char particle sizes. Beans responded well to Rhizobium under char-free conditions but the effects of biochar on the symbiosis were variable and depended on char particle size, concentration and Rhizobium strain (commercial or indigenous). Powdered char inhibited plant growth when in the presence of the commercial rhizobia, but not with indigenous strains. This is an important finding since commercial inocula are commonly used in agronomic situations. Plant available soil nutrients were modified by biochar and surprisingly by an interaction between char concentration and the two rhizobia strains. When beans were co-cropped with wheat, beans performed better when grown with powdered char than without. This is in contrast to the response of bean plants to powdered char in the absence of any competition. Since wheat was generally the superior competitor, powdered char amendment enabled the bean to take advantage of the N-limiting environment that powdered char created and perform better than in the soils that advantaged the wheat. The investigation highlighted the complexity of the system, but identified the importance of char particle size and Rhizobium strain selection.
format	thesis
qualification_name
qualification_level	Doctorate
author	Asilah Abdul Mutalib
author_facet	Asilah Abdul Mutalib
author_sort	Asilah Abdul Mutalib
title	Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)
title_short	Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)
title_full	Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)
title_fullStr	Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)
title_full_unstemmed	Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)
title_sort	interactions between plant growth promoting microorganisms (pgpm) and biochar (ir)
granting_institution	Universiti Pendidikan Sultan Idris
granting_department	Fakulti Teknikal dan Vokasional
publishDate	2018
url	https://ir.upsi.edu.my/detailsg.php?det=4727
_version_	1747833140904198144

Interactions between plant growth promoting microorganisms (pgpm) and biochar (IR)

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