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

Water Stress Effects on Water Relations of Rice Grown in Nutrient Film Technique

Dr. K P Halder
CSO and Head
Farm Management Division, BRRI, Gazipur, Bangladesh

Dr. S. W. Burrage
Ex. Senior Lecturer
Dept of Agricultural Sciences Imperial College at Wye (University of London) Wye, Ashford, Kent, UK

Abstract/ Executive Summary:

Rice plants grown in nutrient film technique (NFT) to evaluate the effect of intermittent water stress on water relations, transpiration rate and leaf temperature. It was observed that the total water uptake by the plant, leaf relative water content (RWC), leaf water potential and rate of transpiration were decreased with increasing water stress. The transpiration rate was also decreased with increasing water stress but leaf temperature increased. There was a positive correlation between (R²=0.81) leaf temperature and RWC and between leaf temperature and transpiration (R²=0.68).

Keywords: Drought stress, NFT, Oryza sativa L., Water relations

Location: Glass house unit, Imperial College at Wye, University of London, UK

Start Date: 00-05-1998

End Date: 00-10-1998

Program Area: Crop-Soil-Water Management

Commodity: Water management

Objectives:

To know the better understanding about drought stress effects on water relations i.e. total water uptake by the plants, leaf water potential, relative water content, and net photosynthetic rate in rice, this experiment was conducted in nutrient film technique (NFT) and drought stressed period was considered until the plants received a set amount of solar radiation.

Methodology:

The experiment was carried out in the glasshouse of Imperial College at Wye, University of London, UK during May to October, 1998. Rice (Oryza sativa L. cv. BR24) seeds were germinated in an incubator at constant temperature of 30^oC for 48 hours. The individual germinated seeds were placed in small wetted rock wool cubes. The cubes were placed in trays in a glasshouse at a temperature of 26^o C day and night. After 5 days, the seedlings were given equal amount of mixture of 1% stock solution A and 1% stock solution B of Wye nutrient solution. After 10 days, at 15-16 cm height of plants, they were transferred to larger rock wool cubes in the NFT system. Each gully contained 12 plants. Tap water was circulated through the gullies for three days to encourage root growth before adding the nutrient solution. The EC) and P^H of the nutrient solution was maintained 3.0 mS cm^-1 and 5.5-6.5, respectively. The plant spacing was 20cm X 20cm . Day and night temperatures were set at 27 and 21^O C, respectively. Ventilation of the cubicle was set at 29^OC. Water stress was imposed in relation to solar radiation received by the plant because the water loss by a plant through transpiration depends upon the availability of solar energy received. The greater amount of

Treatments

Treatments	From 15 days after Pl to panicle emergence	From panicle emergence to maturity
T1= Minimal stress	Continuous circulation (Control)	Continuous circulation (Control)
T2= Low stress	0.30 MJ m^-2 solar radiations received then 15 minutes nutrient solution circulation	0.60 MJ m^-2 solar radiation received then 15 minutes nutrient solution circulation
T3 = Medium stress	0.60 MJ m^-2 solar radiation received then 15 minutes nutrient solution circulation	1.20 MJ m^-2 solar radiation received then 15 minutes nutrient solution circulation
T4= High stress	1.20 MJ m^-2 solar radiation received then 15 minutes nutrient solution circulation	2.40 MJ m^-2 solar radiation received then 15 minutes nutrient solution circulation

radiation received before irrigation ( nutrient solution circulation) was applied. The water stress treatments were adjusted by controlling the period between recirculation of the nutrient solution by means of computer connected to a tube radiometer. The total radiation received within the glasshouse was integrated and the pumps were switched on for fifteen minutes after a fixed amount of energy had been received. T₁ plants received continuous circulation of nutrient solution during day and night. The other treatments did not receive any circulation of nutrient solution at night. The treatments were laid out in a RCB design with four replication. Total water uptake by the plants, leaf water potential, relative water content, and net photosynthetic rate were measured.

Source of Information: Pak.J. Biol. Sci., 6 (5); 441-444, 2003

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The relative water content (RWC), leaf water potential and transpiration rate decreased with increasing water stress and leaf temperature increased with increasing water stress.

Knowledge Management: Journal