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

Fahmida Rahman
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

ATM Sakhawat Hossain
Senior Scientific officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The soil having clay loam in texture, pH 5.92, organic C 0.84 %, total N 0.08%, available P 5.08 mg kg-1 , exchangeable K 0.23 meq/100 g soil, available S 5.39 mg/kg and available Zn 3.69 mg/kg required N dose for BRRI dhan28 is 174 kg N/ha (estimated economic optimum dose), while the N dose for BRRI dhan29, BRRI dhan36 and BRRI dhan45 was 129, 145 and 148 kg/ha, respectively.

Keywords: Rice, Hybrid entries, MVs, N response,

Location: Bangladesh Rice Research Institute farm, Gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

1. to study the N response behavior of MVs and hybrid entries

Methodology:

In T. Aman 2008, two inbred (BRRI dhan30 and BRRI dhan49) and two hybrid entries (Hybrid-EH1 and Hybrid-EH2) were tested with six N fertilizers doses- 0, 40, 60, 80, 100 and 120 kg N/ha. In Boro 2009, four popular BRRI modern varieties BRRI dhan28, BRRI dhan29, BRRI dhan36 and BRRI dhan 45 were grown 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 while in Boro P- K- S @ 32-26-24 kg/ha as STB was applied .The experiments were laid out in a split plot design having N fertilizer in the main plots and varieties in sub-plots. The treatments were repeated in thrice. Urea-N was applied in three 3 equal splits i.e 1/3 N at basal, 1/3 N at active tillering stage and 1/3 N at 5-7 days before PI 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 day old seedlings using 2-3 seedlings/hill were transplanted in T. Aman and Boro season, respectively. All intercultural operations were done as and when required. At maturity, the crop was harvested 5 m2 areas at the centre 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. Nitrogen content from plant samples were determined by micro Kjeldahl method.

Source of Information: Proceedings of BRRI Annual Internal Review, 2008-2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In T.Aman, the grain yield increased with increasing the N doses up to 40kg/ha in tested genotypes and above that the yield was declined. Among the tested genotypes, hybrid EH1 produced the highest grain yield of 4.44t/ha. But when further increased the rates of N, the yield was decreased. BRRIdhan49 performed better than BRRIdhan30 in terms of grain yield even at lower doses of N. Hybrid lines EH1 was superior to EH2. In Boro season, all the varieties responded up to 160 kg N/ha and further increase in N doses yield decreased to some extent. Among the rice varieties the highest grain yield (5.45 t/ha) was obtained with BRRIdhan28 followed by BRRI dhan36 and BRRI dhan45 (4.74 t/ha). The performance of BRRIdhan29 was not so good due to some unknown reasons. Similar trend was also obtained in case of straw yield. Regression analysis indicated that the estimated response function between N rates and grain yield for all the values was quadratic in nature. The values of R2 was highly significant only for hybrid lines for T. Aman season while in the Boro season the values of R2 was highly significant for all the tested varieties. Nitrogen uptake was significantly higher with increasing the rates of N fertilizer. The highest N uptake was noted by BRRI dhan28 (117 kg/ha) followed by BRRI dhan45 (108 kg/ha) and BRRI dhan36 (104 kg/ha). In Boro season, irrespective of varieties the highest net additional income/ha was obtained when N was applied @ 160 kg/ha. Among the varieties BRRIdhan28 gave the highest net additional income (Tk. 66630/ha). In T.Aman season, net additional income of Tk. 8506/ha was obtained when N was applied @ 40 kg/ha with BRRIdhan30. Between the hybrid entries, the EH2 gave highest economic return at 40 kg N/ha compared to other N doses.

Knowledge Management: Report/Proceedings