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Effect of Different Weeding Regimes on Growth, Nodulation, and Yield Performance of Soybean Cv. BARIsoybean-6

Rafiqul Islam
Department of Agriculture, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Tangida Akter
Department of Agriculture, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Fainur Joy
Department of Agriculture, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Shamsunnahar
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh;

Mohammad Golam Rabbani
Research Cell, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Shohrab Hoshain
Department of Agriculture, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Abstract/ Executive Summary:

The experiment was conducted at the Agricultural field laboratory in Noakhali Science and Technology University during the period from mid-January 2019 to the 1st week of May 2019, to find out the growth, nodulation, and yield performance of soybean cv. BARI soybean 6 under different weeding regimes. The experiment consists of four treatments viz. T₀ (No weeding), T₁ (Weed-free), T₂ (Two-hand weeding at 15 DAS and 30 DAS), and T₃ (Three-hand weeding at 15 DAS, 30 DAS, and 45 DAS). The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Characters like plant height, number of pod plant^-1, number of effective pod plant^-1, number of non-effective pod plant^-1, number of seed pod^-1, and yield varied significantly among the different weeding regimes. The highest seed yield (1.275- ton ha^-1) was recorded at T₁ (weed-free) and the lowest seed yield (0.903-ton ha^-1) was observed at T₀ (No weeding) condition. The economic analysis of the treatments showed that farmers will be better off by adopting two weeding regimes and weeding at 15 DAS and 30 DAS is therefore recommended for high income.

Keywords: soybean, Weed, Nodulation, Growth

Location: Agricultural field laboratory in Noakhali Science and Technology University

Start Date: 00-01-2019

End Date: 00-05-2019

Program Area: Crop-Soil-Water Management

Commodity: Soybean, Infestation, Soybean

Objectives:

To find out the effect of different weeding regimes on growth, nodulation, and yield of soybean.

Methodology:

The experiment was carried out at the field of Agriculture in Noakhali Science and Technology University, Noakhali, during the period from Mid-January 2019 to 1st week of May 2019 to evaluate the growth, nodulation and, yield performance of BARI soybean-6 under different weeding regimes. The area lies between 10 m above sea level and latitude 22.790 and the area was characterized by sub-tropical climate. The average temperature and rainfall were 27.50C and 33.125 mm respectively during the experimental time (WMN 2019). The experiment field was almost loamy soil, medium high land, and moderately alkaline with a pH value of 7.5 and the soils become saline in the dry season. Generally, fertility is medium but low in organic matter. The water holding capacity of the soil is much less. (Source: Soil Resource Development Institute, Noakhali). The experiment consists of four treatments viz. T0 (No weeding), T₁ (Weed-free), T₂ (Two-hand weeding at 15 DAS and 30 DAS), and T₃ (Three-hand weeding at 15 DAS, 30 DAS, and 45 DAS). The study was laid out in a Randomized Complete Block Design (RCBD) with four treatments replicated thrice. The size of each plot was 4 m × 2.5 m. The replication was separated from one another by 1 m spacing. The spacing between the individual plots was 0.5 m. Seeds of BARI soybean6 were collected from the Bangladesh Agriculture Research Institute (BARI), Gazipur, Bangladesh. The experimental land was first opened with a power tiller. Later, the land was prepared by ploughing and cross-ploughing and subsequently leveled by laddering. Thereafter, the land was ploughed, and deep ploughing was obtained good tilth, which was necessary to get better yield. Laddering was done to break the soil clods into small pieces followed by ploughing. The fertilizers applied in the soil during final land preparation were urea, TSP, MoP, Gypsum, and Boric acid @ 55, 150, 100, 80, and 10 kg ha^-1. The seeds of soybean were planted in the line sowing method maintained 3-4 cm depth in mid-January using 30 cm × 5 cm spacing. Two irrigations were applied in the experimental field. First irrigation was done at 20 DAS and second irrigation was provided at 55 DAS. Economic analysis was carried out using the prevailing market prices for inputs at planting and for outputs, at the time the crop was harvested. All costs and benefits were calculated on a hectare basis in BDT. The following concepts used in the partial budget analysis are defined as mean grain yield is the average yield (t/ha) of each treatment. The average yield was adjusted downwards by 5%. The adjusted yields represent the potential yield from the farmer’s field using the same treatments. The gross field benefit was calculated by multiplying the field price by the adjusted yield. The net benefits were calculated by subtracting the total costs that vary from the gross field benefits for each treatment. For data collection, five hills were selected at random from each plot and tagged for measuring plant height and five hills were selected for counting the number of nodules plant^-1 at 45, 60, and 75 DAS. To determine dry weight the sample plants were first air-dried for 5-6 hours. Then the samples were packed in labeled brown paper bags and dried in the oven for 24 hours until a constant weight was reached. After oven drying, the samples were weighed by using an electric balance. Data were collected from randomly selected five hills prior to harvest on yield contributing characters of BARI soybean 6. In each plot central 1m×1m area was harvested to record the yields of grain. The harvested crop of each plot was separately bundled, properly tagged, and then brought to the threshing floor. The harvested crops were threshed by hand sticks and the fresh weight of grain yield was recorded plot-wise. Data recorded for growth and yield parameter were compiled and tabulated in proper form for statistical analysis. Analysis of variance was done with the help of the MSTAT-C computer package programme, developed by Russel (1986). The mean differences among the treatments were adjudged by the DMRT test (Gomez and Gomez, 1984).

Source of Information: Res. Agric., Livest. Fish.8(2): 193-199, August 2021

Article Link (Online Journal): DOI: https://doi.org/10.3329/ralf.v8i2.55489

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Different weeding regimes had a great impact on the nodulation and seed yield of soybean. The economic assessment of the treatments showed that application of two weeding regimes was more profitable than all the other treatments. Based on the findings of this experiment, it is recommended that two weeding regimes could maximize farm income.

Knowledge Management: Journal