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

Elevated Co2 and Nitrogen Interaction in Photosynthesis and Productivity of Modern and Local Rice (oryza Sativa L.) Cultivars

M. A. Razzaque
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

M. Moynul Haque
Department of Agronomy, Bangabandhu Sheikh Mujibur Rohman Agricultural University, Gazipur 1706, Bangladesh.

A. Hamid
Department of Agronomy, Bangabandhu Sheikh Mujibur Rohman Agricultural University, Gazipur 1706, Bangladesh.

Abstract/ Executive Summary:

Photosynthetic rate and productivity of modern and local rice (Oryza sativa L.) cultivars were compared at different levels of nitrogen and elevated CO₂ concentrations. BRRIdhan 39 and Shakkorkhora representing modern and local cultivars, respectively were tested under the conditions of three nitrogen levels and three CO₂ concentrations. Nitrogen levels were (i) control (0 kg N ha^-1), (ii) optimum (90 kg N ha^-1 for modern and 60 kg N ha^-1 for local cultivar) and (iii) supra optimum (135 kg N ha^-1 for modern and 90 kg N ha^-1 for local cultivar). Conversely, the three CO₂ concentrations were (i) open top chamber (OTC) with elevated CO₂ (570 ± 50 ppm), (ii) OTC with ambient CO₂ (~360 ppm) and (iii) open field. It was observed that the elevated CO₂ independently increased the photosynthetic rates in both cultivars. While in interaction, elevated CO₂ and supra optimal nitrogen increased the photosynthetic rate in modern rice cultivar only. Productivity of two rice cultivars corresponded to that of photosynthetic rates. The highest yield (50.82 g plant^-1) was found in modern cultivar at supra optimal nitrogen and elevated CO₂ treatments. In contrary, the lowest yield (15.09 g plant^-1) was observed in local cultivar at zero kg nitrogen treatment. However, productivity of local rice cultivar was substantially increased either by applied optimum nitrogen or by CO₂ enrichment.

Keywords: Rice, Cultivar, Nitrogen, CO2, Photosynthesis, Yield

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Start Date: 00-00-2003

End Date: 00-00-2003

Program Area: Crop-Soil-Water Management

Commodity: Rice, Fertilizer

Objectives:

To compare the photosynthetic response and productivity of modern and local rice cultivars under elevated CO₂ and nitrogen levels.

Methodology:

Pot experiment was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during wet season of 2003. BRRldhan 39 and Shakkorkhora representing modern and local cultivars respectively were grown under three nitrogen levels and three CO₂ concentrations. Nitrogen levels were (i) control (0 kg N ha^-1), (ii) optimum (for modern variety 90 kg N ha^-1 and for local 60 kg N ha^-1) and (iii) supra optimum (for modern 135 kg N ha^-1 and for local variety 90 kg N ha^-1). Supra optimum was 1.5 time higher than their optimum dose. Supra optimum dose was applied to meet the higher nitrogen demand of the plants for better growth under elevated CO₂ concentration. Three CO₂ concentrations were (i) open top chamber (OTC) with elevated CO₂ (570 ± 50 ppm), (ii) OTC with ambient CO₂ (~360 ppm) and (iii) open field. Construction and operation of OTC were followed as per description of Uprety. Thirty days old rice seedlings were transplanted in plastic pots containing approximately 12 kg clayed soil on 2 August, 2003. The treatments were replicated thrice and each pot had one seedling. Except nitrogen, a common dose of fertilizer at the rate of 20 kg P, 60 kg K, 20 kg Sand 3.5 kg Zn ha^-1 was applied prior to transplanting while nitrogen was applied in three installments at 4, 21 and 52 days after transplanting (DAT). Weeding, irrigation and pest control measures were done as and when necessary. Flag leaf photosynthetic rates were measured during flowering stage. The measurements were taken under natural sunlight using portable photosynthesis measuring device (UCOR 6200, Lincon, Nebraska). In each treatment, the measurements were carried out on the fully expanded flag leaf of the mother shoot on clear sunny days during 1100 to 1300 hours. At maturity, yield attributes and yield of rice cultivars were recorded for each plant. Number of panicles per plant and spikelets per panicles per plant and spikelets per per panicle were counted. Filled sikelets were also separated and counted manually from all of the panicles of sampled plant. Thousand grains were randomly counted by multi auto Counters and weighed in an electronic balance (AND, Counting, FX-300). Grain Yield was recorded on per plant basis and adjusted at 14% moisture content. The data recorded on different parameters were statistically analyzed by partitioning the total variance with the help of computer using MSTAT-C program. Differences between the treatment means were Com pared using Duncan's Multiple Rang Test (DMRT).

Source of Information: The Agriculturists 7(1&2): 105-112 (2009), ISSN-1729-5211

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Elevated CO₂ increased leaf photosynthetic rates of both modern and local rice cultivars. But photosynthetic rate under the condition of enriched CO₂ and high nitrogen was pronounced only in modern rice cultivar. Thus, grain yield of modern rice cultivar can be increased by applying higher amount of nitrogcn under elevated CO₂concentration. In local rice cultivar, yield can be increased either by applying optimum nitrogen or by elevated CO₂ concentrations.

Knowledge Management: Journal