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High Density Grain Panicles of Br3 in Dry Season Based on Thousand Grain Weight Under Different Plant Densities and Nitrogen Levels

A L Shah
Soil Science Division, BRRI, Gazipur-1701, Bangladesh.

M S Rahman
Soil Science Division, BRRI, Gazipur-1701, Bangladesh.

M Ishaque
Soil Science Division, BRRI, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Experiments were conducted at the BRRI Regional Station, Habiganj during the dry season of 1996 under different plant densities and N levels. The purpose were to identify high-density grains panicle based on the whole panicle grain weight. Filled grains weight increased with increasing specific gravity of the sodium chloride solution. Filled grains of BR3 - heavier than specific gravity of 1.18 (1000-grain weight >26.9 g) were considered as high density grain. The panicle produced within second week at 20 x 20 cm spacing or only first week at close spacing were considered as high density grain panicles. High-density grain panicles extended one week more in seedling number experiment than spacing experiment viewing same plant densities. Application of N extended high-density grain panicles production by one week, than no N ; but the response pattern was similar as spacing or seedling number per hill. Placing more number of hills per unit area rather than placing more seedlings per hill was observed to be effective in increasing grain yield.

Keywords: Rice, BR3, Dry season, 1000 grain weight, Plant densities, Nitrogen level

Location: Bangladesh Rice Research Institute, Regional Station, Habiganj

Start Date: 00-00-1996

End Date: 00-00-1996

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine whether the grain weight could be used as an indicator for identifying high yield potential plants
To determine the role of varying N levels at large competitive crop environment with a wide range of plant population/unit area

Methodology:

The experiments were conducted at the Bangladesh Rice Research Institute, Regional Station, Habiganj during 1996 dry season. Soil of the experimental field was clay with pH 5.2, organic C 0.73%, total N 0.07%, available P 12 ppm and Exchangeable K 0.2 meq/100 g soil. One experiment was done with three spacing (20 x 20 cm, 20 x 10 cm, and 10 x 10 cm) and three N rates (0, 60,120 kg/ha). The other study was conducted with three different seedling numbers (2, 4 and 8 seedlings/hill) with the same N rates. Both the experiments maintained 50-200 seedlings/m² by varying both spacing and seedling numbers/hill. The experiments were laid out in a randomized complete block design with three replications. The unit plot size was 4 x 4 m. One- third N as urea and all P and K (25 and 33 kg/ha as TSP and muriate of potash) were applied as basal doses and incorporated into soil before transplanting and rest of N was applied at 21 and 40 days after transplanting (DAT) in two equal splits. BR3 was used as the test crop. Forty-five day-old seedlings were transplanted. For spacing experiments two seedlings/hill were used and for seedling number/hill experiments hills were spaced 20 x 20 cm apart. All intercultural operations were done as and when necessary. Tillers produced were marked with iron rings number in a fixed hill (2 x 2 hill). At maturity the productive tillers of marked hills were counted. After counting, all the grains were weighed for 1000-grain. For conveniences of statistical analysis up to four-week productive tillers data were considered in present investigation. High density grain at maturity was determined from four hills in each replication of 20 x 20 cm spacing with NPK @ 60-25-33 kg/ha as standard treatment. Spikelets were collected and assessed at different specific gravity of sodium chloride solution. The specific gravity levels were prepared from 1.00 to 1.20 with a range of 0.02 measuring with hygrometer as per Padmaja Rao et ai. (1985). To adjust hygrometer reading first zero needs 20 g salt in a liter of tap water and then at each level 30 g of salt was required per liter to raise the next level of specific gravity. The necessary adjustment to maintain a specific gravity level was made with salt and standardized with hygrometer. All the spikelets harvested were first placed in 1.00 specific gravity solution and the content of the beaker was stirred. The floated ones like chaff and partially filled were separated with a plastic mesh and were counted by pressing them with finger. The filled spikelets submerged were heavier than the solution. Submerged spikelets were again transferred to 1.02 sp gravity solution, and the floated and submerged ones were separated. The floated ones are equal to 1.00 specific gravity levels. The test weight and the percentage of filled spikelets were determined at each specific gravity level. For yield data, 5 m² were harvested from each plot and grain yields were adjusted to 14% moisture content.

Source of Information: Bangladesh Rice J. 11(Special Issue) : 23-27, 2002

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results suggested that, placing more hills per unit area rather than placing more seedlings/hill was effective in increasing grain yield.

Knowledge Management: Journal