Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils
The major problem of rice cultivation is low efficiency of N fertilizer and increasing production costs due to the rising price of N fertilizer. Nitrogen fertilizer inputs constitute a high proportion of the price of production. The biological nitrogen fixation technology by inoculating plants wi...
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
2002
|
| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10587/1/FP_2002_11.pdf |
| _version_ | 1825944800620183552 |
|---|---|
| author | Neo, Sye Peng |
| author_facet | Neo, Sye Peng |
| author_sort | Neo, Sye Peng |
| collection | UPM |
| description | The major problem of rice cultivation is low efficiency of N fertilizer and
increasing production costs due to the rising price of N fertilizer. Nitrogen
fertilizer inputs constitute a high proportion of the price of production. The
biological nitrogen fixation technology by inoculating plants with diazotrophic
rhizobacteria is an alternative that would subsequently reduces cereal
production cost.
The study consisted of two experiments. Experiment I was the isolation
of microaerophilic rhizobacterial strains from rice soil. Experiment II was a
glasshouse experiment to study the effect of selected microaerophilic
rhizobacteria on rice nutrient uptake under glasshouse condition.
From the isolation procedures, 62 rhizobacterial isolates were collected
from different rice soils. Twenty-six or 41.93% isolates showed positive results
in nitrogen-free media test. Among the positive strains, six isolates (designated as E 1 8, E23, E38, E40, E44 and E47) with comparatively the
highest c.f.u. were studied under the microscope and applied as inoculant in
subsequent glasshouse experiment.
In the glasshouse experiment, a factorial experiment comprising 6
strains X 5 concentrations of nitrogen input with 5 replications were set up
giving a total of 1 50 pots.
Rice plants inoculated with rhizobacteria E44 showed the tendency to
increase nitrogen content, rhizobacteria E38 tends to increase plant
phosphorus content, and rhizobacteria E40 inoculation tends to increase dry
weight of rice plants. Meanwhile, inoculation of rhizobacteria E40 showed the
tendency to increase shoot magnesium content while rhizobacteria E23 tends
to increase root magnesium content. There was no obvious result that shows
either potassium and calcium uptake of rice plant were promoted by
inoculation with the isolated rhizobacteria.
In conclusion, rhizospheres of rice cultivation areas were found to have
high populations of microaerophilic rhizobacteria that have the potential to be
diazotrophs. The selected rhizobacterial strains respectively showed the trend
to promote plant growth (in term of total dry weight) and nutrient (nitrogen,
phosphorus, potassium, calcium and magnesium) uptake of rice plants.
Therefore, they could have the potential to be applied as biofertilizer or
bioenhancer. |
| first_indexed | 2024-03-06T07:21:36Z |
| format | Thesis |
| id | upm.eprints-10587 |
| institution | Universiti Putra Malaysia |
| language | English English |
| last_indexed | 2024-09-25T03:31:09Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | upm.eprints-105872024-04-23T01:01:05Z http://psasir.upm.edu.my/id/eprint/10587/ Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils Neo, Sye Peng The major problem of rice cultivation is low efficiency of N fertilizer and increasing production costs due to the rising price of N fertilizer. Nitrogen fertilizer inputs constitute a high proportion of the price of production. The biological nitrogen fixation technology by inoculating plants with diazotrophic rhizobacteria is an alternative that would subsequently reduces cereal production cost. The study consisted of two experiments. Experiment I was the isolation of microaerophilic rhizobacterial strains from rice soil. Experiment II was a glasshouse experiment to study the effect of selected microaerophilic rhizobacteria on rice nutrient uptake under glasshouse condition. From the isolation procedures, 62 rhizobacterial isolates were collected from different rice soils. Twenty-six or 41.93% isolates showed positive results in nitrogen-free media test. Among the positive strains, six isolates (designated as E 1 8, E23, E38, E40, E44 and E47) with comparatively the highest c.f.u. were studied under the microscope and applied as inoculant in subsequent glasshouse experiment. In the glasshouse experiment, a factorial experiment comprising 6 strains X 5 concentrations of nitrogen input with 5 replications were set up giving a total of 1 50 pots. Rice plants inoculated with rhizobacteria E44 showed the tendency to increase nitrogen content, rhizobacteria E38 tends to increase plant phosphorus content, and rhizobacteria E40 inoculation tends to increase dry weight of rice plants. Meanwhile, inoculation of rhizobacteria E40 showed the tendency to increase shoot magnesium content while rhizobacteria E23 tends to increase root magnesium content. There was no obvious result that shows either potassium and calcium uptake of rice plant were promoted by inoculation with the isolated rhizobacteria. In conclusion, rhizospheres of rice cultivation areas were found to have high populations of microaerophilic rhizobacteria that have the potential to be diazotrophs. The selected rhizobacterial strains respectively showed the trend to promote plant growth (in term of total dry weight) and nutrient (nitrogen, phosphorus, potassium, calcium and magnesium) uptake of rice plants. Therefore, they could have the potential to be applied as biofertilizer or bioenhancer. 2002-02 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/10587/1/FP_2002_11.pdf Neo, Sye Peng (2002) Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils. Masters thesis, Universiti Putra Malaysia. Ingestion - Rice - Rhizobacteria - Case studies English |
| spellingShingle | Ingestion - Rice - Rhizobacteria - Case studies Neo, Sye Peng Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils |
| title | Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils |
| title_full | Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils |
| title_fullStr | Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils |
| title_full_unstemmed | Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils |
| title_short | Nutrient Uptake by Rice Plant Inoculated with Microaerophilic Rhizobacteria Isolated from Selected Rice Soils |
| title_sort | nutrient uptake by rice plant inoculated with microaerophilic rhizobacteria isolated from selected rice soils |
| topic | Ingestion - Rice - Rhizobacteria - Case studies |
| url | http://psasir.upm.edu.my/id/eprint/10587/1/FP_2002_11.pdf |
| work_keys_str_mv | AT neosyepeng nutrientuptakebyriceplantinoculatedwithmicroaerophilicrhizobacteriaisolatedfromselectedricesoils |