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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. Nazrul Islam
Scientific Officer
Soil Science Division, BRRI Gazipur

Farjana Alam
Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

Objective of this study was to determine the N response behavior of promising lines compared with BRRI modern rice varieties. The experiment was conducted in T. Aman season, 2012 at BRRI farm, Gazipur (AEZ-28, land type-MHL). Four N fertilizers doses were tested on fourteen MV rice. The N doses were 0, 27, 54 and 81 kg N/ha. A significant interaction effect was observed between varieties /tested lines and applied N levels. In the T. Aman season, the tested promising lines and varieties produced maximum grain yield at 81 kg/ha N, while in Boro season, yield responses were observed from 120 -180 kg/ha applied N.

Keywords: Advanced lines, N response, Economic doses

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2012

End Date: 30-06-2013

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

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, 2012 at BRRI farm, Gazipur (AEZ-28, land type-MHL). Four N fertilizers doses were tested on fourteen MV rice. The N doses were 0, 27, 54 and 81 kg N/ha. The test promising lines and varieties were IR83377-B-B-93-3, IR82635-B-B-75-2, IR83383-B-B-141-2, IR82635-B-B-145-1, IR82589-B-B-84-3, BRRI dhan56 (ck), BR7611-9-3-2-1, BR7611-17-2-2-2, BR7611-31-5-3-2, BRRI dhan44 (ck), IR83140-B-11-B, SAGC-06, ZHONGZU 14 and HUA 565. The experimental design was split-plot with N fertilizer doses in main plot and varieties in sub-plots. Nitrogen was applied in two splits i.e. 50% at basal and 50% at 25 DAT. A blanked dose of P, K, S and Zn were applied @ 12-42-10-2 kg/ha as STB at the time of final land preparation. The experiment was conducted at Boro season, 2012-13 at the same land. The promising lines BR7830-16-1-5-3, IR83294-9-1-3-2-3-Gaz1, BR7840-54-3-1 and BR7840-54-1-2-5 were tested with BRRI dhan28 and BRRI dhan55 (ck) under four N doses (0, 60, 120 and 180 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.

Source of Information: Proceedings of BRRI Annual Internal Review for 2012- 2013

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the T. Aman season, a significant interaction effect was observed between varieties and N level. The tested promising lines IR83377-B-B-93-3, BR7611-9-3-2-1 and variety BRRI dhan44 (CK) produced more than 4.0 t/ha grain yield without N fertilizer. The promising lines IR83377-B-B-93-3, IR82635-B-B-75-2, IR83383-B-B-141-2, IR82635-B-B-145-1, IR82589-B-B-84-3, BR7611-9-3-2-1, BR7611-17-2-2-2, BR7611-31-5-3-2, IR83140-B-11-B, ZHONGZU 14 and HUA 565 had produced comparatively higher grain yield at all levels of N than the BRRI dhan56 (CK). Similar trend was found in case of straw yield. All promising lines and varieties were produced maximum grain yield at 81 N kg/ha. IR83377-B-B-93-3 produced higher grain yield than other promising lines and varieties at all levels of N. A significant interaction effect was observed between varieties and N level. From the Table 3 it indicates that the tested lines BR7830-16-1-5-3, IR83294-9-1-3-2-3-Gaz1, BR7840-54-3-1 and BR7840-54-1-2-5 produced higher yield than check varieties BRRI dhan28 and BRRI dhan55 under the BRRI farm soil condition at most levels of N. The promising lines BR7830-16-1-5-3, IR83294-9-1-3-2-3-Gaz1 and BR7840-54-3-1 produced maximum grain yield at N levels of 180, 120 and 180 kg/ha, respectively. The promising lines BR7830-16-1-5-3, IR83294-9-1-3-2-3-Gaz1 and BR7840-54-3-1 produced maximum straw yield at N levels of 180 kg/ha.

Knowledge Management: Report/Proceedings