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Yield and Grain Protein Content of Aromatic Boro Rice (cv. BRRI Dhan50) as Influenced by Integrated Fertilizer and Weed Management

P. Roy
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

M.A.R. Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

S.K. Paul*
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during December 2014 to May 2015 to study the effect of integrated fertilizer and weed management on the yield and gain protein content of aromatic Boro rice (cv. BRRI dhan50). The experiment comprised six sets of fertilizer managements. 1. Negative control having no fertilizers and no manures, 2. Recommended dose of inorganic fertilizers (i.e. Urea, TSP, MoP, Gypsum, ZnSO4 @ 250, 120, 120, 100, 10 kg ha^-1, respectively), 3. 50% of recommended dose of inorganic fertilizers + cowdung @ 5 t ha^-1, 4. 75% of recommended dose of inorganic fertilizers + cowdung @ 5 t ha^-1, 5. 50% of recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-1, 6.75% of recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-1. Fourweed managements 1. Control(no weeding), pre-emergence herbicide, 2. Panida 33 EC + one hand weeding at 35 DAT, 3. Post-emergence herbicide, Granite 240 SC + one hand weeding at 35 DAT and4. Pre-emergence herbicide, Panida 33 EC + post-emergence herbicide, Granite 240 SC. The highest grain yield (6.40 t ha^-1), grain protein content (7.79%) and benefit cost ratio (2.20) were obtained from 75% of recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-1with pre-emergence herbicide, Panida 33 EC @ 2.5 l ha^-1+ post-emergence herbicide, Granite 240 SC @ 93.70 ml ha-¹ while their corresponding lowest values were found in weedy check without fertilization. Weed infestation reduced 58.28% grain yield in control plots due to crop-weed competition compared to plot receiving pre-emergence herbicide + post-emergence herbicide. It can be concluded that 75% of recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-¹ combined with pre-emergence herbicide, Panida 33 EC @ 2.5 l ha^-1+ post-emergence herbicide, Granite 240 SC @ 93.70 ml ha^-¹ may be used to obtain the highest grain yield and grain protein content of aromatic Boro rice (cv. BRRI dhan50).

Keywords: Aromatic Boro rice; Integrated fertilizer, Weed management; Yield; Grain protein

Location: Bangladesh Agricultural University, Mymensingh

Start Date: 00-12-2014

End Date: 00-05-2015

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Weed management, Rice

Objectives:

The present study was undertaken to evaluate the effects of integrated fertilizer and weed management on the yield and grain protein content of aromatic Boro rice (cv. BRRI dhan50).

Methodology:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from December 2014 to May 2015 to study the effect of integrated fertilizer and weed management on the growth, yield and quality of aromatic Boro rice (cv. BRRI dhan50). The experimental site belongs to the Sonatola series of the dark grey floodplain soil type under Old Brahmaputra Floodplain Agro-Ecological Zone (AEZ-9). The field was a medium high land with well drained silty-loam texture having pH 6.5 and 1.29% organic matter content. The experiment comprised six sets of fertilizer managements. 1. Negative control having no fertilizers and no manures, 2. Recommended dose of inorganic fertilizers (i.e. Urea, TSP, MoP, Gypsum, ZnSO4@ 250, 120, 120, 100, 10 kg ha^-¹, respectively), 3. 50% of recommended dose of inorganic fertilizers + cowdung @ 5 t ha^-¹, 4. 75% of recommended dose of inorganic fertilizers + cowdung @ 5 t ha^-1, 5. 50% of recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-¹, 6. 75% of recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha^-¹. Fourweed managements viz. control (no weeding), pre-emergence herbicide, Panida 33 EC + one hand weeding at 35 DAT, post-emergence herbicide, Granite 240 SC + one hand weeding at 35 DAT, pre-emergence herbicide, Panida 33 EC + post-emergence herbicide, Granite 240 SC. The experiment was laid out in a factorial randomized complete block design with three replications.The nursery beds were puddled with country plough, cleaned and leveled with ladder. Then the sprouted seeds were sown in the nursery beds on 07 December 2014. At the time of final land preparation, respective unit plots were amended with organic and inorganic fertilizers according to treatment specification. Urea was top dressed in three equal splits at 15, 35 and 55 DAT (panicle initiation stage). Full dose of triple super phosphate, muriate of potash, gypsum and zinc sulphate were applied at final land preparation. Thirty five-day old seedlings were transplanted on 10 January 2015 in the well puddled plot. Three seedlings were transplanted hill^-¹ with a spacing of 25 cm × 15 cm.The weed density and biomass of infesting weeds were recorded at 60 DAT with the help of a plant quadrate measuring 1 m × 1 m from each plot. The collected weeds were dried in an electric oven for 72 hours at a temperature of 85 ± 5°C. After drying, the dry weight of each plot was recorded by an electrical balance. Prior to harvest, five hills plot-1 were randomly selected excluding border hills and central 1 m2area from each unit plot for recording data on yield components. The crop of central 1 m² harvest area of each plot was harvested at full maturity when 85% of the grain became golden yellow in color on 07 May 2015. The harvested crop of each plot was separately bundled, properly tagged and then threshed. Grains were then cleaned and sun dried to a moisture content of 14%. Finally the grain and straw yields plot^-¹ were recorded and converted into t ha^-1. Estimation of protein (%) in grains was done by Micro-Kjeldahl Method (AOAC, 1984). Collected data were analyzed following the analysis of variance (ANOVA) technique and mean differences were adjudged by Duncan's Multiple Range Test (DMRT) (Gomez and Gomez, 1984).

Source of Information: (2017) Int.J.Appl.Sci.Biotechnol.Vol 5(1): 51-58

Article Link (Online Journal): DOI: 10.3126/ijasbt.v5i1.17008

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the present study, it can be concluded that application of 75% is the recommended dose of inorganic fertilizers and poultry manure @ 2.5 t ha^-¹ along with pre-emergence herbicide. Panida 33 EC @ 2.5 l ha^-¹ + post-emergence herbicide, Granite 240 SC @ 93.70 ml ha^-1 may be used to obtain the highest grain yield and grain protein content of aromatic Boro rice (cv. BRRI dhan50).

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