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Effect of Age of Seedlings at Staggered Transplanting and Weed Management on the Growth and Yield of Aromatic Boro Rice (cv. BRRI Dhan50)

Tama Sinha
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Swapan Kumar Paul
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Abdur Rahman Sarkar
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 2015 to May 2016 to study the effect of age of seedlings at staggered transplanting and weed management on the growth and yield of aromatic Boro rice (cv. BRRI dhan50). The experiment comprised four seedling ages at staggered transplanting viz. 30, 45, 60 and 75-day old seedlings with five different weed management treatments viz. unweeded controls, two hand weeding at 20 and 35 DAT (days after transplanting), pre-emergence herbicide (Pendimethaiin, Panida 33EC) applied at 3 DAT + one hand weeding at 35 DAT, post-emergence herbicide (Penoxsulam, Granite 240 SC) applied at 12 DAT + one hand weeding at 35 DAT, pre-emergence herbicide (Panida 33 EC) applied at 3 DAT + post-emergence herbicide (Granite 240 SC) applied at 12 DAT. It was observed that the experiment was laid out in a randomized complete block design with three replications. The highest plant height and total dry matter hill^–1 were recorded in 30-day old seedlings with pre-emergence herbicide (Panida 33EC) applied at 3 DAT + post-emergence herbicide (Granite 240 SC) applied at 12 DAT. Younger seedlings (30-day old) produced the highest number of total tillers hill–1 (11.08), effective tillers hill^–1 (8.47), grains panicle^–1 (80.76) and grain yield (3.94 t ha–1) compared to aged seedlings at staggered transplanting. In case of weed management, pre-emergence herbicide (Panida 33EC) applied at 3 DAT + post-emergence herbicide (Granite 240 SC) applied at 12 DAT produced the highest number of effective tillers hill-1 (8.89), grains panicle^–1 (81.66), 1000-grain weight (18.44 g), grain yield (4.47 t ha^–1) and straw yield (5.13 t ha^–1). Grain yield was reduced by 59.82% in unweeded control compared to pre-emergence herbicide (Panida 33EC) applied at 3 DAT + post-emergence herbicide (Granite 240 SC) applied at 12 DAT. In interaction, 30-day old seedlings combined with pre-emergence herbicide (Panida 33 EC) applied at 3 DAT + post-emergence herbicide (Granite 240 SC) applied at 12 DAT produced the highest effective tillers hill^–1 (9.58), grains panicle^–1 (89.47), 1000-grain weight (18.93g), grain yield (5.31 t ha^–1) and straw yield (5.75 t ha^–1). Therefore, 60-day old seedlings at staggered transplanting with pre-emergence herbicide (Panida 33EC) applied at 3DAT + post-emergence herbicide (Granite 240 SC) applied at 12 DAT appears as the promising technique for aromatic Boro rice cultivation.

Keywords: Age of seedlings, staggered transplanting, Weed management, Growth, Yield

Location: At the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-12-2015

End Date: 00-05-2016

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

The present study was undertaken with a view to delineating the performance of aromatic Boro rice (cv. BRRI dhan50) with age of seedlings at staggered transplanting and weed management.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from December 2015 to May 2016. The experimental site is located at 24.75° N latitude and 90.50°E longitude at an altitude of 18 m. The site belongs to the noncalcareous dark grey floodplain soil under the Agroecological Zone Old Brahmaputra Floodplain (AEZ-9) (UNDP and FAO, 1988).The soil of the experimental field was silty loam in texture having pH 6.8 with 1.29 % organic matter. BRRI dhan50 (Banglamoti), a modern aromatic fine rice variety, was used as the test variety. The experiment comprised four ages of seedlings at staggered transplanting viz. 30, 45,60 and 75 days; five weed management viz. unweeded control, two hand weeding at 20 DAT and 35 DAT, pre-emergence herbicide (Pendimethaiin, Panida 33EC) @ 2.5 l ha^–1) applied at 3 DAT +one hand weeding at 35 DAT, post emergence herbicide (Penoxsulam, Granite 240 SC) @ 93.70 ml ha^–1 ) applied at 12 DAT + one hand weeding at 35 DAT, pre-emergence herbicide (Panida 33 EC @ 2.5 l ha^–1) applied at 3 DAT + post emergence herbicide (Granite 240 SC 93.70 ml ha^–1) applied at 12 DAT. The experiment was laid out in a randomized complete block design with three replications. The size of unit plot was 4.0m × 2.5m. Seeds were sown in the nursery on 5 December with proper care. Seedlings were transplanted on 5 January, 20 January, 5 February and 20 February as per different ages of seedlings at staggered transplanting viz. 30, 45, 60 and 75 days, respectively in the well puddled plot. Transplanting was done by using two seedlings hill^–1 with 25 cm ×15 cm spacing. Data collection at vegetative stage Five hills were randomly selected after 10 days of transplanting and marked with bamboo sticks in each plot excluding border rows to record the data on plant height and number of tillers hill^–1 at 15-day intervals beginning 15 DAT up to 45 DAT. To determine the total dry matter, two plants were randomly uprooted from each plot excluding border rows and central 1 m² harvest area at 15, 30, and 45 DAT. Data collection for weeds Weed density was calculated species-wise at 65 DAT using 1 m² quadrate as per method described by Cruze et al. (1986) from three spots in each plot at random and converted to number m^–2. After determining the weed density, the weeds inside each quadrate were uprooted and cleaned. The collected weeds were dried in an electric oven for 72 hours at a temperature of 85 ± 5° C and their dry weights recorded by an electrical balance. Data collection at harvest At maturity (when 90 % of the grains became golden yellow in color) counted one square meter prefixed area from each plot was harvested to record grain and straw yields. Four hills were randomly selected from each plot (excluding boarder rows and central 1 m² harvest area) for recording data on crop characters and yield components. Transplanted seedlings of 30-day-old and 45-day-old were matured earlier and harvested on 7 May and 11 May 2016, respectively. Crops which were transplanted on 60 and 75-day old seedlings matured later and harvested on 16 May 2016. The harvested crop was threshed manually. The grain was cleaned and dried to a moisture content of 14 %. Straws were sun dried properly. Finally grain and straw yields plot^–1 were recorded and converted to t ha^–1. Harvest index was also calculated. Statistical analysis All the 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: J Bangladesh Agril Univ 16(1): 5–11, 2018 ISSN 1810-3030 (Print) 2408-8684 (Online)

Article Link (Online Journal): doi: 10.3329/jbau.v16i1.36472

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this study it can be concluded that 30-day old seedling with pre-emergence herbicide (Panida 33 EC) applied at 3 DAT + post-emergence herbicide (Granite 240 SC) applied at 12 DAT is the best one for grain yield of aromatic Boro rice cv. BRRI dhan50 under normal transplanted condition. In case of staggered transplanting, 60-day old seedlings in combination with pre-emergence herbicide (Panida 33EC @2.5 l ha^–1) applied at 3DAT + post-emergence herbicide (Granite 240 SC 93.70 ml ha^–1) applied at 12 DAT appears as the promising technique for aromatic Boro rice cultivation which is as good as 30-day old seedlings with the same weed management practice. The transplanting of Boro rice can further be delayed up to 75-day old seedlings (Transplanting on 20 February) with an appreciable grain yield of 3.72 t ha^–¹ where there is no possibility of getting younger seedlings.

Knowledge Management: Journal