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

Optimizing Seedling Age of Promising Rice Genotypes in Rainfed Environment

Biswajit Karmakar
Senior Scientific Officer
BRRI Regional Station, Rajshahi

Md Abdur Rahman Sarkar
Professor
BAU, Mymensingh

Abstract/ Executive Summary:

The experiment was conducted during wet season of 2010 and 2011 at BRRI Rajshahi. Strip plot design was followed with 3 replications, placing treatments (seedling age such as 14, 21, 28 and 35-d old) in vertical plots and genotypes (BRRI dhan56, BRRI dhan57, IR83377-B-B-93-3, IRRI123, IR83381-B-B-6-1 and Binadhan-7) in horizontal plots. Transplanting of 14-d old seedlings gave the highest grain yield that was at par with 21-d old seedling, however, significantly higher than 28 and 35-d old seedlings. Mean grain yield were increased by 21.9, 20.5 and 12.2% in transplanting of 14, 21 and 28-d old seedlings over 35-d old seedlings across the cropping years and genotypes. Across the seedling ages, the genotype IR83377-B-B093-3 produced the highest mean grain yield (4.88 t ha-1) which was at par with IRRI 123 (4.82 t ha-1) and the lowest was in BRRI dhan57 (3.73 t ha-1). Interaction between genotypes and seedling ages showed that BRRI dhan56, BRRI dhan57 and IR83381-B-B-6-1 produced higher yield from 14 to 21-d old seedlings while Binadhan-7 gave at par yield from 14 to 28-d old seedling. In contrast, grain yield of IR83377-B-B-93-3 and IRRI 123 was statistically similar throughout the seedling age from 14 to 35-d old. Days to flowering and maturity increased 12 to 14 days from 14 to 35-d old seedlings. Spikelet sterility also increased by 18 to 23.1% from 14 to 35-d old seedlings. In contrast, Plant height, tillers and panicles m^-2, grains panicle^-1, 1000-grain weight, straw yield and total above ground biomass were declined with increased seedling age.

Keywords: Biomass, Grain yield, Panicle, Rainfed environment, Seedling age

Location: Experimental farm, BRRI Regional Station, Rajshahi

Start Date: 01-07-2010

End Date: 30-11-2011

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the optimum seedling age at transplanting in varying rice genotypes under rainfed environment; and
To characterize the effect of seedling age on the performance of the different genotypes.

Methodology:

The experiment was conducted during wet season (June to November) of 2010 and 2011 at the Experimental Farm of Bangladesh Rice Research Institute (BRRI), Regional Station, Rajshahi (24°22" N latitude, 88°40" E longitude, 21 above msl). Experimental soils are silty loam to silty clay loam, calcareous and slightly alkaline in reaction. Six genotypes, namely, IR74371-70-1-1 (Released as BRRI dhan56 in 2011), BR7873-*5(NIL)-51-HR6 (Released as BRRI dhan57 in 2011), IR83377-B-B-93-3, IRRI 123, IR83381-B-B-6-1 and Binadhan-7 were used in the experiment with four seedling ages (14, 21, 28 and 35-d old). The experiment was laid out in a strip-plot design with 3 replications, placing seedling age treatments in vertical plots and genotypes in horizontal plots. Unit plot size was 12 m². Seeds of the genotypes were sown at 4 dates with 7 days interval according to the treatments, but seedlings of all treatments were transplanted on the same day. Seedlings of different ages based on treatment schedule were transplanted on 5 August 2010 and 1 August 2011, at 3 seedlings hill-1 spaced at 20 cm x 15 cm. Uniform crop management practices were followed for each treatment. From the center of each plot, a 5 m² area was harvested for the determination of grain and straw yields at maturity. After harvest, grains were sun-dried, and weight and moisture content were measured. Grain yield was adjusted to 14% moisture content, and expressed in t ha^-1. Data gathered in the experiments were statistically analyzed following procedures described by Gomez and Gomez (1984). Analysis of variance (ANOVA) was done using statistical software CropStat7.2. Means were compared with least significant difference (LSD) test.

Source of Information: J. Crop and Weed. 11(Special Issue):149-160. MAR 2015.

Article Link (Online Journal):

Funding Source:

1.	Budget: 20000/-

Total Budget (Tk.) : 20000/-

Achievement/Findings:

It can be concluded that transplanting of younger seedlings at an age of 14 or 21-d produced at par grain yield, which was significantly higher than 28 and 35-d old seedlings. Interaction of seedling ages and genotypes showed that BRRI dhan56, BRRI dhan57, IR83381-B-B-6-1 and Binadhan-7 produced highest grain yield at 14-d old seedlings that was at par with 21-d old seedlings and thereafter yield significantly declined. In contrast, Binadhan-7 gave at par yield from 14 to 28-d old seedlings while the genotypes IR83377-B-B-93-3 and IRRI 123 gave at par yield from 14 to 35-d old seedling albeit the best yield obtained at 14-d old seedling. BRRI dhan56, BRRI dhan57 and IR83381-BB-6-1 could be transplanted at 14 to 21-d old seedling while the other genotypes IR83377-B-B-93-3, IRRI 123 and Binadhan-7 could be transplanted 14-35-d old seedling to conquer better yield and performance.

Knowledge Management: Journal