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Nitrogen Fertilization Mv Rice in Boro Season

N. I. Bhuiyan
Chief Scientific Officer and Head
Soil Science Division, BRRI, Gazipur-1701

G. M. Panaullah
Chief Scientific Officer and Head
Soil Science Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

A field experiment was conducted at BRRI farm, Gazipur in Boro season 1996 with 0, 40, 80, 120, 160 and 200 kg N/ha. The test rice variety was BR3. Objective of the study was to determine the maximum and economic optimum of N fertilizer for Boro rice. The experimental design was RCB with four replications. The rice grain yield increased consistently with an increase in the applied N rate up to 160 kg/ha. The relationship between N rates and grain yields of Boro rice was quadratic in nature. The calculated optimum N rates for maximum grain yield of BR3 was 166.44 kg/ha. The calculated economic optimum dose of N was 156.8 kg/ha and expected rice yield at that level of applied N was 5.14 t/ha. Nitrogen fertilization increased the concentration of N in both straw and grain. The total N uptake was the highest (99.46 kg/ha) at 160 kg/ha applied N level. With an increase in the N dose, N recovery decreased gradually and the lowest, 25.33%, was obtained at 200 kg N/ha.

Keywords: Nitrogen, Rice, Economic and Optimum dose of fertilizers

Location: Bangladesh Rice Research Institute (BRRI) farm, Gazipur

Start Date: 01-11-1996

End Date: 30-06-1997

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To determine the maximum and economic optimum of N fertilizer for Boro rice

Methodology:

A field experiment was conducted at BRRI farm, Gazipur in Boro season 1996 with 0, 40, 80, 120, 160 and 200 kg N/ha. Soil of the experimental field was a clay loam with pH 6.7, organic carbon 1.08% and total N 0.12%. Nitrogen fertilizer was applied into 3 splits for. All other fertilizers (PKS and Zn) were applied at land preparation. The test rice variety was BR3. Two to three rice seedling/hill were transplanted at 20 x 20 cm spacing. The experimental design was RCB with four replications. The crop was harvested from 5 m² area at the center of each plot and rice grain weight was adjusted to 14% content. The relationship between N doses and grain yield could be expressed by the quadratic equation-

Y = a + bx + cx² where, Y = yield of rice (t/ha), x = N doses (kg/ha), a is regression constant, b and c regression coefficients. The N rates for maximum rice yield was calculated by differentiating the regression equation, when dy/dx = 0, the expected optimum N rates for maximum yield was calculated by the equation,

N_max = -b/2c. The economic optimum dose of N fertilizer was calculated using the equation –

N_opt = 1/2c[Pf/Py – b] when, Pf = price of N (Tk. 10/kg) anf Py = price of grain (Tk. 6000/t). Data on N content (%), uptake (kg/ha) and N recovery (%) were recorded.

Source of Information: Proceedings of the BRRI Annual Internal Review for 1996-1997.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

An experiment was conducted at BRRI farm, Gazipur in Boro season 1996 with six N levels (0, 40, 80, 120, 160 and 200 kg/ha). Tested variety was BR3. Application of N increased rice yield considerably. The rice yield of BR3 increased consistently with an increase in the applied N rate up to 160 kg/ha. The relationship between the N dose and grain yield fit well in quadratic equation (R² = 0.951). The calculated optimum N rates for maximum yield of BR3 was 166.44 kg/ha. The economic optimum dose of n was 156.8 kg/ha. Nitrogen fertilization increased the concentration of N in both straw and grain. In N control plot concentration in straw was 0.81% which increased up to 1.25% in N₁₆₀ level. The N concentration in grain varied from 0.45% in N control plot to 0.70 in N₁₆₀ level. The total N uptake by BR3 increased considerably due to N fertilization. The highest N uptake (99.46 kg/ha) was observed in N₁₆₀ level. The apparent recovery of added N was the highest (55.75%) at 80 kg N/ha. Nitrogen recovery decreased gradually with an increasing N rate and the lowest recovery, 25.33% was obtained at 200 kg N/ha.

Knowledge Management: Report/Proceedings