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Effect of N Rates on Yield of Br8417-2-1-2, Br7528-2r-19-hr10, Br7830-16-1-5-3, Weed Tolerant Rice, Br7671-37-2-2-3-7 and Br7833-11-1-1-2-1-2b5

Md. Nazrul Islam
Scientific Officer
Soil Science Division, BRRI Gazipur

Fahmida Alam
Scientific Officer
Soil Science Division, BRRI Gazipur

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

Abstract/ Executive Summary:

An investigation was done at BRRI Gazipur T. Aman 2013 and Boro 2014 to determine N response behavior of promising lines compared to BRRI rice varieties. The tested promising lines and varieties in T. Aman were BR8417-2-1-2, BR7528-2R-19-HR10, BRRI dhan39 (Ck) and BRRI dhan49 (Ck). The fertilizer dose for Aman was 0, 40, 80 and 120 kg N/ha. In Boro season, promising lines BR7830-16-1-5-3, weed tolerant rice, BR7671-37-2-2-3-7 and BR7833-11-1-1-2-1-2B5 were tested with BRRI dhan28 (Ck) under four N doses (0, 60, 120 and 180 kg N/ha). At 120 kg N/ha, BR7528-2R-19-HR10 gave significantly higher grain yield than BRRI dhan49. In Boro, BR7830-16-1-5-3 gave significantly higher grain yield at 180 kg N/ha compared to 120 kg N/ha. One hundred twenty kg N/ha was sufficient to produce maximum grain yield for weed tolerant rice, BR7671-37-2-2-3-7 and BR7833-11-1-1-2-1-2B5. 15-16 kg N in T. Aman and 14-17 kg N in Boro seasons required to produce one ton rice grains. In T. Aman season, BR7528-2R-19-HR10 showed higher nitrogen RE (36%) than others. In Boro season, 47% of nitrogen RE was found in weed tolerant rice compared to other tested varieties.

Keywords: Promising lines, Nitrogen rate, Rice advanced lines

Location: BRRI farm, Gazipur

Start Date: 00-00-2013

End Date: 00-00-2014

Program Area: Variety and Species

Commodity: Fertilizer

Objectives:

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

Methodology:

An investigation was undertaken to determine N response behavior of promising lines compared to BRRI rice varieties. The experiment was conducted in T. Aman and Boro season, 2013-14 at BRRI farm, Gazipur (AEZ28, land type-MHL). In T. Aman season, four N doses were tested against four MV rice. The N doses were 0, 40, 80 and 120 kg N/ha. Nitrogen was applied in three splits as 34% at basal, 33% at 20 DAT and rest 33% at 7 days before PI stage. The tested promising lines and varieties were BR8417-2-1-2, BR7528-2R-19-HR10, BRRI dhan39 (Ck) and BRRI dhan49 (Ck). In Boro season, promising lines BR7830-16-1-5-3, weed tolerant rice, BR7671-37-2-2-3-7 and BR7833-11-1-1-2-1-2B5 were tested with BRRI dhan28 (Ck) under four N doses (0, 60, 120 and 180 kg N/ha). Nitrogen was applied in three splits as 34% at basal, 33% at 25 DAT and rest 33% at 5-7 days before PI stage. The treatments were assigned in a split-plot with N doses in the main plots and varieties in the sub-plots. Phosphorus, K, S and Zn were applied @ 12-42-10-2 kg/ha and 20-60-10-2.2 kg/ha in T. Aman and Boro seasons, respectively as STB at final land preparation.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2013-2014

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Grain yields of rice were significantly influenced by N levels and genotypes. BR8417-2-1-2 and BRRI dhan39 (Ck) produced about 3.0 t/ha grain, while BR7528-2R-19-HR10 and BRRI dhan49 (Ck) produced about 4.0 t/ha without N fertilizer. BR7528-2R-19-HR10 produced comparatively higher grain yield than BRRI dhan39 at all N levels but it produced higher grain yield than BRRI dhan49 at N₈₀ and N₁₂₀ levels. However, yield difference between BR7528-2R-19-HR10 and BRRI dhan49 was significant at N₁₂₀ level. BR8417-2-1-2 produced comparatively lower grain yield at all N levels than other genotypes. Each level of N application significantly increased grain yield of BR7528-2R-19-HR10 and BRRI dhan49. Application of N @ 120 kg/ha significantly increased grain yield of all tested rice genotypes in T. Aman season. In Boro season, BR7830-16-1-5-3 produced significantly higher grain yield than other tested genotypes under native N condition. Application of 60 to 120kg N/ha significantly improved grain yield of all tested genotypes. All genotypes produced the highest grain yield at 180 kg N/ha. However, application of 180 kg N/ha significantly increased rice yield compared to 120 kg N/ha only in BR7830-16-1-5-3. So, 120 kg N/ha was sufficient for weed tolerant rice, BR7671-37-2-2-3-7 and BR7833-11-1-1-2-1-2B5 to produce maximum yield. At this N level, weed tolerant rice gave significantly higher grain yield than other genotypes. BR7833-11-1-1-2-1-2B5 did not show any yield advantage over check variety irrespective of N application. BR7528-2R-19-HR10 uptake significantly higher amount of N compared to others at N₁₂₀. At Boro season, the highest amount of N absorbed by rice plants at N₁₈₀ varied from 76 to 93 kg N/ha. BR7830-16-1-5-3 absorbed more N compared to others. The highest RE was in BRRI dhan49 (49%) followed by BR7528-2R-19-HR10 (48%) while in Boro, the highest RE (54%) was recorded with BR7833-11-1-1-2-1-2B5.

Knowledge Management: Report/Proceedings