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Yield of Modern Irrigated Rice Varieties Under Different Population Dynamics

M. A. Mannan
Agronomy Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

M. B. Rahman
Agronomy Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

A. A. Choudhury
Agronomy Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

S. B. Siddique
Agronomy Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

Experiments were conducted at the Bangladesh Rice Research Institute (BRRI) farm, Cazipur, during 1986 and 1988 Boro seasons. Modern rice varieties, BRl,BR3, BR12, BR14, and BR20, were planted at 25cmx30cm, 25cmx20cm, 25cmx15cm, 25cmx10cm and 15cmx10cm spacings. The objective was to determine the optimum population density for a higher yield. The number of tillers, panicles and grain yield per unit area increased with the increase in plant densities. Planting at 25cmx10cm and 15cmx10cm spacing gave identical and significantly higher grain yield. Among the tested varieties, BR14 yielded the highest grain with 150-155 days growth duration.

Keywords: Yield, Modern irrigated rice varieties, Population dynamics

Location: BRRI farm, Gazipur

Start Date: 00-00-1986

End Date: 00-00-1988

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the response of modern irrigated rice varieties to yield under varied population densities.

Methodology:

Experiments were conducted at the BRRI farm, Gazipur. BR1, BR3, and BR14 were planted on 01 January, 1986, at 25cmx30cm, 25cmx15cm and 25cmx10cm spacings, while BR1, BR3, BR12, BR14, and BR20 were transplanted on 07 February, 1988, at 25cmx30cm, 25cmx10cm and 15cmx10cm spacings with 2-3 seedilings per hill. The treatments were distributed in a split plot design with three replications. The varieties were placed in the main plot and spacing in the sub-plot. The unit plot size was 3mx2m. Fertilizer at the rate of 60-40-lO kg/ ha of P₂0₅ K₂0 and S were applied during final land preparation. Eighty kg/ha was applied in three equal splits, the first topdress was made on 20 days after transplanting (DAT), the second at the maximum tillering stag and the third at 7-5 days before the panicle initiation stage. All other intercultural operations were done as and when necessary. Data on grain yield were recorded from a sampling area of 5m² from each plot and were adjusted at 14% moisture content. The collected data were analyzed following standard statistical procedure and the means were compared following DMRT.

Source of Information: Bangladesh Rice J. 2 (1 & 2) :59-62, 1991

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The number of tillers, panicles and grain yield per unit area increased with the increase in plant densities. Planting at 25cmx10cm and 15cmx10cm spacings gave identical and significantly higher grain yield. Among the tested varieties, BR14 yielded the highest grain with 150-155 days growth duration.

Knowledge Management: Journal