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Nitrogen Response of Mv in Rice-fellow-rice Cropping Pattern in Gazipur

Md. Abu Saleque
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

Umme Aminun Naher
Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The study was conducted at BRRI farm Gazipur in T. Aman 2005 and Boro 2006 with six N fertilizers doses; 0, 40, 80, 120, 160 and 200 kg N/ha to know the N response behavior of rice varieties and lines. BRRI dhan41 has given significantly higher grain yield at 40 kg N/ha than the rest three varieties. This indicates that BRRI dhan41 has more capability to utilization on N at low soil N condition as because of higher N content in both grain and straw. The higher N content in the plant might help to produce higher yield. In Boro season, BRRI dhan28 and BR 4828 line gave identical and significantly higher grain yield than BRRI dhan29 and BR6144. But the grain and straw yield of rice exhibited increasing trend with the increasing N doses up to 160 kg/ha for all tested genotype. However, the increase of grain yield beyond 120 kg/ha was significant except BRRI dhan29. Therefore, N@120 kg/ha may be optimum for rice production in Boro season at Gazipur.

Keywords: Nitrogen, N response, Cropping pattern, Rice

Location: BRRI farm, Gazipur

Start Date: 01-07-2005

End Date: 30-06-2006

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To know the N response behavior of rice varieties and lines

Methodology:

The study was conducted at BRRI farm Gazipur in T. Aman 2005 and Boro 2006 with six N fertilizers doses; 0, 40, 80, 120, 160 and 200 kg N/ha. The soil of the experimental field was slightly acidic. Four T. Aman varieties (BRRI dhan31, BRI dhan34, BRRI dhan41 and BRRI dhan44) and four Boro varieties/lines (BRRI dhan28, BRRI dhan29, BR6144-36-5-2 and BR 4828-54-4-1-4-9) were tested in split plot design in 3 replications. N fertilizer doses were in the main plot and varieties were in sub-plot. A flat dose of PKS (kg/ha) @ 19-17-14 were applied as STB. The native soil N was 0.08%. Urea was applied in three splits as 34% at basal, 33% at 25 DAT and rest 33% at 5-7 days before PI stage. At maturity the crop was harvested manually from 5 m² area at 15 cm above ground. However, 16 hills from each plot were harvested at ground level for straw yield data. Grain yield was recorded at 14% moisture content and straw yield as oven dry basis.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2005-2006

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

BRRI dhan41 produce grain yield of (4.38 t/ha) at 40 kg N/ha thus it can produce high grain yield at low N dose compared to BRRI dhan31, BRI dhan34 and BRRI dhan44 at T. Aman season. In the Boro season 120 kg/ha N is sufficient to produce BRRI modern rice varieties.

Knowledge Management: Report/Proceedings