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Quality Characteristics of Two Cotton Cultivars as Influenced by Seed Dressing with Imidacloprid Insecticide

Regional Cotton Research Station
Regional Cotton Research Station, Dinajpur, Bangladesh

H.M.S. Azad
Regional Cotton Research Station, Dinajpur, Bangladesh

M.A. Baqui
Department of Zoology, Jahangirnagar University, Savar, Dhaka, Bangladesh

M.S. Hossain
Department of Entomology, Bangabandhu Sheikh Mujibar Rahman Agricultural University, Gazipur 1704

M.R. Amin
Department of Entomology, Bangabandhu Sheikh Mujibar Rahman Agricultural University, Gazipur 1704

Abstract/ Executive Summary:

Cotton yield, fibre quality and seed germination especially depend on cultivated variety, production technology and pest management techniques. Gaucho 70 WS is an imidachloprid seed dressing insecticide which has been extensively used in Bangladesh for management of cotton sucking pests. In this study seeds of CB3 and CB9 cotton cultivars were treated with different dosages of Gaucho 70 WS and investigations were done to know their effect on seed germination and quality of crops. Results indicated that Gaucho 70 WS as seed dresser did not affect germination over a period of four weeks for both CB3 and CB9 cultivars. On the contrary, seed treatments showed significant effect on ginning out tern, seed index, lint index, fibre length and micronaire value of these two cultivars. Gaucho 70 WS as seed dresser revealed quality crops with proper seed germination indicated that this insecticide was suitable for CB3 and CB9 cultivars.

Keywords: Fiber, Germination, Ginning, Lint index, Micronaire value

Location: Regional Cotton Research Station, Dinajpur, Bangladesh

Start Date: 00-08-2008

End Date: 00-03-2009

Program Area: Variety and Species

Commodity: Cotton

Objectives:

1. The present study imidacloprid insecticide, Gaucho 70 WS was used as seed dresser and investigation was done to know its effect on seed germination, ginning out tern, seed index, lint index, fiber length and micronaire value of the crops.

Methodology:

Seed treatment: The fuzzy seeds of CB3 and CB9 cultivars were separately soaked in water for half an hour and then put on sieves for drying. Gaucho 70 WS powder and cotton seeds were poured into different bowls following 1.5, 2.5, 3.5, 4.5 or 5.5 g/kg seed and stirred for 10-15 minutes for complete adherence of the chemical to the individual seed coat. Then the seeds were put on papers and dried in the sun for 30-45 minutes. Therefore, the seeds were stored in brown paper bags until germination test. Germination test: CB3 and CB9 cotton seeds treated with different dosages of Gaucho 70 WS were used for germination test on 0, 7, 14, 21 or 28th day of treatment. Control observation for each cultivar was done with non-treated seeds. For germination test sands were sieved to discard particles bigger than 0.8 mm and smaller than 0.05 mm in diameter. Rectangular plastic boxes were used to put the sands and for every test new sands were used. Seeds were placed on a uniform layer of moist sands and then covered to a depth of 10 mm with sands. For each cultivar and treatment 100 seeds were placed in each plastic tray and replicated four times. The plastic trays with seeds were incubated at room temperature and irrigated at every odd day. After one week, germination percentage was recorded. The normal seedlings, abnormal seedlings and non-germinated seeds were classified according to the prescribed rules given by International Seed Testing Association (ISTA) and germination percentage was calculated using the following formula. Germination (%) = [{(No. of seed produced normal seedlings) ÷ (No. of seed tested)} × 100]. Cultivation of crops: Cotton crops were cultivated in the Regional Cotton Research Station, Dinajpur, Bangladesh (25^o13'N, 88^o23'E) during August 2008 to March 2009. Crops were raised with CB3 and CB9 cotton seeds treated with different dosages of Gaucho 70WS. These varieties were also cultivated with non-treated seeds for control experiments. The experimental design was a randomized complete block with four replications. Plot size was one row, 6 m long, spaced 1 m apart. Seeds were sown 45 cm apart within a row. Plots were maintained per Bangladesh Cotton Development Board recommendations. Observation of crop qualities: A 50 boll sample of open bolls (seed cotton) in each plot was handpicked from four replications of each test to obtain boll sample data for observation of crop qualities. Therefore, bolls were ginned with a single roller electrical gin in the laboratory. Boll sample data included: (i) ginning out tern (GOT) = percentage of lint obtained from a sample of seed cotton; (ii) seed index = weight of 100 seeds (g); (iii) lint index = fibre weight on 100 seeds; (iv) fibre length (cm); and (v) micronaire value = fibre fineness and maturity. Fibre length was measured using fibre length measurement device KX730 (Dowell Science and Technology, HK Co. Ltd., Hong Kong) and micronaire value was tested using a cotton micronaire testing machine (Zhenjiang KDL Machinery Co. Ltd., Jiangsu, China). Data analysis: One way ANOVA following Duncan’s Multiple Range Test (DMRT) was employed using IBM SPSS 19 for analyzing the data.

Source of Information: J. Agrofor. Environ. 6 (1): 71-74, 2012; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results indicated that Gaucho 70 WS as seed dresser did not affect germination over a period of four weeks for both CB3 and CB9 cultivars. On the contrary, seed treatments showed significant effect on ginning out tern, seed index, lint index, fibre length and micronaire value of these two cultivars. Gaucho 70 WS as seed dresser revealed quality crops with proper seed germination indicated that this insecticide was suitable for CB3 and CB9 cultivars.

Knowledge Management: Journal