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Effect of Integrated Nitrogen Application on the Yield of Two Boro Rice Varieties: BRRI Dhan29 and BRRI Dhan74

Mst. Shirin Akter
Department of Agronomy, Bangladesh Agricultural University, Mymenshingh-2202, Bangladesh

Sabina Yeasmin
Department of Agronomy, Bangladesh Agricultural University, Mymenshingh-2202, Bangladesh

Ahmed Khairul Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymenshingh-2202, Bangladesh

Abstract/ Executive Summary:

This study aimed to evaluate the effect of integrated nitrogen (N) application on the yield of Boro rice. The experiment was composed of two rice varieties: BRRI dhan29 and BRRI dhan74, and eleven N management approaches: control (without N), 100% varietal recommended dose (RD) of N from urea, 75% of RD from urea + 25% of RD from poultry manure (PM), 50% of RD from urea + 50% of RD from PM, 25% of RD from urea + 75% of RD from PM, 75% of RD from urea + 25% of RD from vermicompost (VC), 50% of RD from urea + 50% of RD from VC, 25% of RD from urea + 75% of RD from VC, 75% of RD from urea + 25% of RD from cowdung (CD), 50% of RD from urea + 50% of RD from CD and 25% of RD from urea + 75% of RD from CD. Performance of BRRI dhan74 was better compared to BRRI dhan29 in terms of yield. For both verities, application of 75% of RD from urea + 25% of RD from PM produced the highest grain yield (BRRI dhan74: 3.30 t ha^-1and BRRI dhan29: 3.08 t ha^-1) and the lowest with control among the N management approaches. Thus, it can be suggested that integrated N application with 75% of varietal RD from urea and 25% from PM in Boro rice cultivation will produce appreciable grain yield and also expected to have positive effect on soil health.

Keywords: Inorganic fertilizer, Integrated nutrient management, Manure, Recommended dose, Vermicompost

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-12-2016

End Date: 00-05-2017

Program Area: Crop-Soil-Water Management

Non-commodity: Evaluation

Objectives:

1. To evaluate the differential varietal response on integrated N management practices,

2. To determine the effect of integrated N application on growth and yield of rice and

3. To determine the best combination of integrated N management for Boro rice cv. BRRI dhan29 and BRRI dhan74.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh (located at 24°75^’N latitude and 90°5^’E longitude) belonging to the Old Brahmaputra Floodplain agro-ecological zone of Bangladesh (AEZ- 9) during December 2016 to May 2017. The topography of the experimental field was low to medium with moderate drainage facilities having non-calcareous dark gray floodplain soil (UNDP and FAO, 1988). The texture of the soil was loamy in nature with more or less neutral (pH 6.8) in reaction and low in N (0.1%) and exchangeable K (0.14%) contents. Available P and S were 26.0 and 13.9 ppm, respectively and general fertility level was also low. The climate of experimental site was sub- tropical in nature which is characterized by high temperature, high humidity and heavy precipitation with occasionally gusty wind during Kharif season (April to September) and scanty rain- fall associated with moderately low temperature during Rabi season (October to March). The experiment consisted of two factors: A) two varieties and B) eleven N management approaches as follows: BRRI dhan29 was developed by Bangladesh Rice Research Institute (BRRI) in 1994, by crossing of BG-902 and BR51-45-5. The cultivar of BRRI dhan29 matures in 155-160 days. The grain is medium sized and golden yellow in color. Harvesting time is mid-April to early May and the average yield of the cultivar is 7.5 t ha^-1. This cultivar has the resistance against leaf blight and sheath blight. BRRI dhan74 was developed by BRRI through hybridization method in 2014. BRRI dhan74 matures in 145-147 days. The aver- age yield of the cultivar is 7 t ha^-1. The special quality of this variety is the protein (8.3%) and amylose (24.2%) contents of the grains. Control (without N application) (N₁), 100% varietal recommend- ed dose (RD) of N from urea (N₂), 75% N of RD from urea + 25% N of RD from poultry manure (PM) (N₃), 50% N of RD from urea + 50% N of RD from PM (N₄), 25% N of RD from urea + 75% N of RD from PM (N₅), 75% N of RD from urea + 25% N of RD from vermicompost (VC) (N₆), 50% N of RD from urea + 50% N of RD from VC (N₇), 25% N of RD from urea + 75% N of RD from VC (N₈), 75% N of RD from urea + 25% N of RD from cowdung (CD) (N₉), 50% N of RD from urea + 50% N of RD from C (N₁₀) and 25% N of RD from urea + 75% N of RD from C (N₁₁). [Here, for urea: 100% = 263 kg ha^-1; 75% = 197 kg ha^-1; 50% = 131 kg ha^-1; 25% = 66 kg ha^-1; for PM: 75% = 4323 kg ha^-1; 50% = 2882 kg ha^-1; 25% = 1440 kg ha^-1; for VC: 75% = 6052 kg ha^-1; 50% = 4035 kg ha^-1; 25% = 2017 kg ha^-1 and CD: 75% = 7566 kg ha^-1; 50% = 5044 kg ha^-1; 25% = 2521 kg ha^-1]. The experiment was conducted in Randomized Complete Block Design (RCBD) with three replications. The size of each unit plot was 5 m² (2.5 m × 2 m). The space between block to block and plot to plot was 1m and 0.5 m, respectively. The experimental land was opened with a power tiller and then puddled thoroughly by ploughing. Weeds and stubble of the previous crop were collected and removed from the field. Both organic and inorganic fertilizers were applied according to the treatments. Urea was applied into three equal splits. The first split of urea, triple super phosphate (TSP), muriate of potash (MoP), gypsum and other organic manure (PM, VC and CD) were at the time of final land preparation as per treatment. The second split of urea was top dressed at 30 days after transplanting (DAT) and third split of urea was top dressed at 60 DAT (Panicle initiation stage). Organic manures were analyzed (micro Kjeldahl method) in the laboratory for N content and found 2.1%, 1.5% and 1.2% N in PM, VC and CD, respectively. Thirty-five days old seedlings were then transplanted in rows in the main field at the rate of three seedlings hill^-1 with 25 cm × 15 cm spacing. Intercultural operations- gap filling, weeding, irrigation and drainage have been done as when necessary. The crop was harvested at full maturity. The harvested crop of each plot was separately bundled, properly tagged and the fresh weights of grain straw were recorded plot wise. The grains were cleaned and sun dried to a moisture content of 14%. Five random hills of each plot were selected to record plant height, total tillers hill^-1, effective tillers hill^-1, number of sterile spikelet panicle^-1 and grains panicle^-1; and 1000-grain weight, grain + straw yields, biological yield and harvest index of each plot were recorded from the whole plot at harvest. The record- ed data on yield and yield contributing characters were statistically analyzed using “Analysis of Variance” technique following two factors RCBD computer package MSTAT. The mean differences among treatments means were tested by Duncan’s New Multiple Range Test (DMRT).

Source of Information: Archives of Agriculture and Environmental Science 3(4): 410-415 (2018)

Article Link (Online Journal): DOI: 10.26832/24566632.2018.0304014

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study concluded that BRRI dhan74 performed better than BRRI dhan29 in terms of yield. Integrated application of 75% N of RD from urea + 25% N of RD from PM was the best N management approach for Boro rice cv. BRRI dhan29 and BRRI dhan74 to obtain highest grain yield. However, this approach needs to be tested in different locations of Bangladesh before making final inference.

Knowledge Management: Journal