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Nitrogen Response of Mvs and Hybrid Entries in a Rice–fallow-rice Cropping Pattern

Fahmida Rahman
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

A.T.M.Sakhawat Hossian
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The economic return was comparatively higher in Boro than T.Aman season at different N rates with different rice genotypes. In T.Aman season, net additional income of Tk. 11,782/ha was obtained when N was applied @ 40 kg/ha with BRRI dhan 49. Between the hybrid entries, the EH3 gave the highest economic return at 40 kg N/ha compared to other N doses. In Boro season, irrespective of varieties highest net additional income/ha was obtained when N was applied @ 160 kg/ha. Among the varieties BRRI dhan45 gave the highest net additional income (Tk. 65,454/ha)

Keywords: N response, Hybrid rice, Cropping pattern.

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Variety and Species

Commodity: Fertilizer

Objectives:

To study the N response behavior of high yield group varieties and lines.

Methodology:

In T. Aman 2009, two inbred (BRRI dhan49 and BR 7594) and two hybrid entries (Hybrid-EH3 and Hybrid-EH4) were grown with six N fertilizers doses- 0, 40, 60, 80, 100 and 120 kg N/ha. In Boro 2010, there were also two inbred (BRRI dhan45 and BRRI dhan50) and two hybrid entries (Hybrid-EH5 and Hybrid-EH6) were tested with 0, 40, 80,120,160 and 200 kg N/ha. A flat dose of P- K- S @19-17-14 kg/ha as STB was applied in T.Aman season and in Boro season P-K-S @ 32-26-24 kg/ha as STB was applied. The experiments were laid out in a split plot design with 3 replications. In main plots N fertilizer doses and in sub-plots varieties were tested. The treatments were repeated in thrice. Urea N was applied in three equal splits i.e. 1/3 N at basal, 1/3 at active tillering and 1/3 at 5-7 days before panicle initiation stage. Phosphorous, K and S fertilizers were applied at final land preparation .The unit plot size was 12 m x 4 m. Thirty and forty days old seedlings were transplanted in T. Aman and Boro season respectively. All intercultural operations were done as requirement. At maturity, the crop was harvested from 5 m² areas at the centre of each plot and 16 hills were collected for straw yield. The grain field was recorded at 14% moisture content and straw yield was as on dry basis.

Source of Information: Proceedings of BRRI Annual Internal Review for 2009- 2010

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In T. Aman season, significant yield difference was observed at lower dose of nitrogen compared to higher N doses. All the tested rice genotypes gave higher grain yield at the rate of 40 kg N/ha. Among the tested genotypes BRRI dhan49 gave highest grain yield (4.49 t/ha), but further increased the nitrogen doses yield decreased. Among the hybrids, hybrid EH4 (4.0 t/ha) is superior to hybrid EH3 (3.74 t/ha). Similar trend was also observed in case of straw yield. In Boro season, significant result was obtained by applying different rates of N. The grain yield increased with increasing the rates of N fertilization irrespective of varieties. All the varieties responded upto 160 kg N/ha and further increase in N doses yield decreased to some extent. Among the rice varieties the highest grain yield (5.35 t/ha) was obtained with BRRI dhan45 followed by EH5 (5.26 t/ha) and EH6 (5.0 t/ha). BRRI dhan50 gave the lowest yield (4.28 t/ha) among the tested genotypes. Similar trend was also obtained in case of straw yield.

Knowledge Management: Report/Proceedings