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Chemodynamics of Cypermethrin in Eggplant Agroecosystem in Bangladesh

Shahinoor Rahman
Department of Entomology, EXIM Bank Agricultural University, Bangladesh

Md. Mahbubar Rahman
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

Md. Zinnatul Alam
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

Abstract/ Executive Summary:

A study was conducted in the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, which is situated at 24.040 N latitude and 90.400 E longitude with an elevation of 8.4 meter from the sea level and in the 28th Agro-ecological Zone (AEZ) during November 2012 to April 2013. A field study was conducted to measure the application loss of insecticide through soil and air at different growth stages of eggplant crop. Fate of cypermethrin during the application consists of receiving insecticide by the eggplant and disseminating it to the other non target site mainly air and soil. The total highest loss of cypermethrin (82.3±4.2%) was recorded at 45 days after transplanting (DAT) and the loss was through air (5.2±0.3%) and soil (77.2±2.6%). The lowest plant height and canopy area were observed at 45 DAT in that time cypermethrin application loss were the highest. Among the different treatments, the lowest cypermethrin loss and maximum retention of cypermethrin in the plant (49.2%) were observed in T3 treated plot which was started at 104 DAT when the plant height and canopy area was reached at a maximum level and obviously the environmental component was polluted at a minimum rate.

Keywords: Cypermethrin, Application loss, Agro-ecosystem, Environment, Pollution.

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Eggplant

Objectives:

The present study was undertaken to measure the application loss of cypermethrin insecticide through soil and air in eggplant agroecosystem at different growth stages of eggplant crop

Methodology:

Location A study was conducted in the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur-1706, during November 2012 to April 2013. Design of Experiment The field experiment comprising of four treatments with an untreated control was laid out in a Randomized Complete Block Design (RCBD) with three replications. The treatments were: T1 = Ripcord (cypermethrin) 10 EC at 1 ml/l of water sprayed at 45 DAT and repetition of the same at 7 days interval. T2 = Ripcord (cypermethrin) 10 EC at 1 ml/l of water sprayed after initiation of 2% level of fruit infestation and repetition of the same at 15 days interval. T3 = Ripcord (cypermethrin) 10 EC at 1 ml/l of water sprayed after observing 5% level of fruit infestation and repetition of the same at 15 days interval. T4 = Ripcord (cypermethrin) 10 EC at 2 ml/l of water sprayed after observing 5% level of fruit infestation and repetition of the same at 15 days interval and T5 = Untreated control. Data Recording The following parameters were considered for measuring the application loss of insecticides. 1. Weight of insecticide spray-on foam sheet placed on ground (Application loss in soil). 2. Weight of insecticide spray-on foam sheet placed over the plant canopy (Application loss in air). 3. Weight of insecticide on plant = {Total weight of spray volume (minus) - (1+2)}. 4. Height of plant (cm). 5. Area of plant canopy (cm2). Determination of Application Loss in Soil For determining insecticide application loss in soil, a polythene sheet was initially placed in the 9 m2 plot. Then the foam sheet (1.25 cm thickness) of the same size (weighed) was placed on the polythene sheet to avoid loss of applied insecticide to the ground. Immediately after application of insecticide, the foam was weighed finally by electric balance. Insecticide application loss in soil was determined by subtracting the initial weight from the final weight of the foam sheet. Determination of Application Loss in Air The plots (3m X 3m) were housed by the polythene sheet. On the underside of the roof of the house, a foam sheet (weighed) was placed. Immediately after application of insecticide, the final weight of the foam sheet was taken by electrical balance and loss of insecticide in the air was measured from the difference between the final and initial weight of the foam sheet. Measurement of Plant Height and Canopy Plant height (cm) and canopy area (cm2) were recorded at the time of each insecticidal application with the help of a measuring scale. The canopy was measured at the north-south (NS) and the east-west (EW) direction and the area were calculated by using the formula. Data analysis All the collected and processed data as stated above were analyzed statistically after appropriate transformations. The analysis of variance (ANOVA) and multimode general linear model (GLM) of different parameters was done and the means were separated by using the Duncan’s Multiple Range Test (DMRT) using SPSS software.

Source of Information: International Journal of Agronomy and Agricultural Research (IJAAR) Vol. 6, No. 2, p. 22-28, 2015 ISSN: 2223-7054 (Print) 2225-3610 (Online) http://www.innspub.net

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In this study, we found that, the highest percentage of cypermethrin loss was recorded at 45 DAT (82.3 ± 4.2%) and the lowest percentage (50.6 ± 0.3%) was recorded at 129 DAT. With the increase the plant height and canopy area with increasing plant growth, the applied cypermethrin loss was gradually decreased. As a result, it might be suggestions to the farmers to use this pesticide to start from around 104 DAT when plant height and canopy area attained a maximum level to keep our environment sound from indiscriminate application of cypermethrin insecticide.

Knowledge Management: Journal