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Effect of N Rates on the Yield of Some Newly Released BRRI Varieties/ Promising Lines

Pranesh Kumar Saha
Principal Scientific Officer
Soil Science Division, BRRI Gazipur

M Sajidur Rahman
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

A. Latif Shah
Cheif Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

In T. Aman season, a significant interaction was observed between varieties and N level. All the tested varieties (BRRI dhan51, BRRI dhan52, BRRI dhan53 and BRRI dhan54) did not response beyond 30 kg N/ha. In contrast all the tested four varieties produced more than 4.0 t/ha yield without N fertilizer indicating the fertility of this experimental plot was very high. So the experiment needs to repeat in soil with low fertility to see the actual response of these varieties to N rates. The tested line at season, BR7358-5-3-2-1 yielded 0.22 t/ha and BR7358-30-3-1 yielded 0.08 t/ha higher than check variety BRRI dhan50 (4.34 t/ha) at 150 N kg/ha under the BRRI farm soil condition. Agronomic use efficiency of BRRI dhan50 and line BR7358-30-3-1 were higher than BR7372-18-3-3.

Keywords: N response, Promising lines, N response, Rice

Location: BRRI farm, Gazipur

Start Date: 01-07-2011

End Date: 30-06-2012

Program Area: Variety and Species

Commodity: Rice

Objectives:

To determine the N response behavior of promising lines compared with BRRI modern rice varieties.

Methodology:

The experiment was conducted in T. Aman season, 2011 at BRRI farm, Gazipur (AEZ-28, land type-MHL). Six N fertilizers doses were tested on four MV rice. The N doses were 0, 30, 60, 90, 120 and 150 kg N/ha. The test varieties were BRRI dhan51, BRRI dhan52, BRRI dhan53 and BRRI dhan54. A flat STB dose of PKS @ 9-17-14 kg/ha were applied. The experimental design was split-plot with N fertilizer doses in main plot and varieties in sub-plots. At Boro season, the promising lines BR7372-18-3-3, BR7358-30-3-1 and BR7358-5-3-2-1 were tested with BRRI MV rice (BRRI dhan50) under five N doses (0, 50, 100, 150 and 200 kg N/ha).The experiment was laid out in a split-plot design with 3 replications. Nitrogen doses were accommodated in the main-plots and the varieties in the sub-plots. Nitrogen was applied in three splits i.e. 34% at basal, 33% at 25 DAT and rest 33 % at 7 days before PI stage. A blanked dose of P, K and S were applied at the rate of 12-36-13 kg/ha at the time of final land preparation. All intercultural operations were done when it was necessary. For grain yield the crop was harvested from 5 m² areas at the centre part of each plot and 16 hills were collected for straw yield. The grain yield was recorded at 14% moisture content and straw yield as oven dry basis.

Source of Information: Proceedings of BRRI Annual Internal Research Review, 2011- 2012

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The grain yield of BRRI dhan51, 52, 53 & 54 increased yield up to 30 kg N/ha in T. Aman season while in Boro season BRRI dhan50 and promising lines (BR7358-30-3-1, BR7358-5-3-2-1) produced maximum yield at the rate of 150 kg N/ha.

Knowledge Management: Report/Proceedings