Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Effect of Soil Nutrients on Total and Beneficial Microbial Population in Wetland Rice Cultivation

Umme Aminun Naher
Principal Scientific Officer
Soil Science Division, BRRI Gazipur

Md. Imran Ullah Sarkar
Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The study was conducted at BRRI Gazipur to determine the effect of long term absence of major nutrient elements on total and beneficial microbial population in wetland rice cultivation system. Soil samples were collected from Long term missing element trial, Continuous double cropping pattern (Boro- Fallow-T. Aman) and Continuous wetland intensive rice cropping experiment. There were significant variations of microbial population found in different long term experiments. The long term missing element trial experiment data showed that lower number of total bacterial populations in –P and -K plot. Population of free living NFB was higher in Cow dung 3 t/ha + IPNS, Poultry manure (2 t/ha) + IPNS, NPK₆₀SZn, NPK₄₀SZn and control treatments. There was no N fixing and P solubilizing bacteria in N and P missing plots. Moreover, fungal population was not affected by missing nutrients. Microbial populations in continuous Boro-Fallow-T. Aman pattern showed total microbial populations were high in continuous double cropping pattern experiment. In this experiment, presence of free living NFB was found in all treatments while, PSB was completely missing. Comparatively higher bacteria population was found compared to fungal in the continuous wetland intensive rice cropping system. There was no free living NFB and PSB in this long term experiment.

Keywords: NFB, PSB, Long term experiment, Total bacteria, Fungi

Location: BRRI farm, Gazipur

Start Date: 00-00-2013

End Date: 00-00-2014

Program Area: Crop-Soil-Water Management

Commodity: Bio fertilizer

Objectives:

To determine the effect of long term absence of major nutrient elements on total and beneficial microbial population in wetland rice cultivation system

Methodology:

Total microbial populations were enumerated from long term missing element trial (-N, -P, -K) and compared with control and complete fertilizer treatments. Continuous double cropping pattern (Boro- Fallow-T. Aman) and continuous wetland intensive rice cropping experiments were considered for this purpose. Invitro studies were conducted at BRRI soil microbiology laboratory, Gazipur during T. Aman, 2013. Soil samples were collected between four hills and kept in 4^oC temperature until analyses. One gm soil sample was taken into 95 ml sterile distil water and shaken for 15 minutes. A series of 10 fold dilutions were prepared up to 10^-8 and 0.1 ml of each dilution was spread on the media plates. Nutrient agar for total bacterial population, nitrogen free medium (NfB) for NFB, NBRIP for PSB and potato dextrose agar (PDA) for fungal population were used. After 5 days of incubation, microbial population was counted following spread plate technique.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2013-14

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The long term missing element trial experiment data showed that bacterial populations were higher than to fungi. Among treatments, lower number of total bacterial populations were noticed in –P and -K plot. Population of free living NFB was higher in Cow dung 3 t/ha + IPNS, Poultry manure (2 t/ha) + IPNS, NPK₆₀SZn, NPK₄₀SZn and control treatments. Cow dung applied as IPNS basis supported higher total bacteria, free living NFB and PSB compared to other treatments. There was no N fixing and P solubilizing bacteria in N and P missing plots. Moreover, fungal population was not affected by missing nutrients. Microbial populations in continuous Boro-Fallow-T. Aman pattern showed total bacteria and fungi populations were high in continuous double cropping pattern experiment. However, higher number of total bacteria and fungi population was found in STB treatment. In this experiment, presence of free living NFB was found in all treatments while, PSB was completely missing. Comparatively higher bacteria population was found compared to fungal in the continuous wetland intensive rice cropping system. There was no free living NFB and PSB in this long term experiment. There was no significant variation on microbial population due to treatment effects is recorded in continuous wetland intensive rice cropping system.

Knowledge Management: Report/Proceedings