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Effect of Insect Infestation on the Growth and Yield of Soybean Plants Grown Under Three Different Tree Species

A. Chakma
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh-2202

M. A. Wadud
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh-2202

M. K. Hasan
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh-2202

M. S. Rahman
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh-2202

M. Ahmad
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

Insect pests and their effects on the growth and yield of soybean grown in association with Albida (Acacia albida), Jhau (Casuarina equisetifolia), Akashmoni (Acacia auriculiformis) and in the open field condition were investigated during January to May 2008 in the field laboratory of Agroforestry Department, Bangladesh Agricultural University, Mymensingh. Ten different insect species were detected in the soybean field under the above mentioned tree species of which two were natural enemies i. e. insect predator. Highest insect population was recorded under Albida trees (315) followed by Akashmoni (216), open field (197) and Jhau (193), respectively. Severe infestation was recorded in the vegetative stage followed by pod maturation, flowering, pod initiation and pod filling stages, respectively. Highest yield of soybean was found under Jhau tree (1.84 t ha^-1) which was statistically similar with the open field (1.74 t ha^-1) and under Akashmoni trees (1.70 t ha^-1). Lowest yield was found under Albida trees (1.29 t ha^-1). Compared with recommended soybean yield, 35%, 15%, 13% and 8% yield were reduced under Albida tree, Akashmoni tree, open field condition and Jhau tree, respectively.

Keywords: Insect pest, Soybean, Agroforestry, Acacia albida, Casuarina equisetifolia, Acacia auriculiformis

Location: Agroforestry experimental field of Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 00-01-2008

End Date: 00-05-2008

Program Area: Farming System

Commodity: Soybean, Aloe Vera, Jhao, Akash moni

Objectives:

1. To investigates the insect pest prevalence, severity of infestation and effects of infestation on the yield performance of soybean in association with different MPTs.

Methodology:

The study was conducted in the Agroforestry experimental field of Bangladesh Agricultural University (BAU), Mymensingh during January to May, 2008. Soybean variety G-2 (Bangladesh soybean-4) was grown in association with three MPTs. Three multipurpose trees (MPTs) were Albida (Acacia albida), Akashmoni (Acacia auriculiformis) and Jhau (Casuarina equisetifolia). Insect infestation and yield performance of soybean was observed under these three MPTs and these were the treatments of this study. The experiment was laid out in a Randomized Complete Block Design (RCBD) with 4 replications. The treatments were randomly distributed within the block separately for each species. Treatments were as: T₁ - insect infestation and yield performance of soybean in the open field-control; T₂ - insect infestation and yield performance of soybean under Albida; T₃ - insect infestation and yield performance of soybean under Jhau and T₄ - insect infestation and yield performance of soybean under Akashmoni. Except insect control, all necessary intercultural operations were done when required. The common insect pests of soybean from the different treatments were sampled at different growth stage of soybean. Sampling stages were vegetative, flowering, pod initiation, pod filling and pod maturation. Sampled insects were identified and confirmed with the help of reference book. Infested leaves of soybean plants were counted only in the vegetative stage. Infested leaf counting was started from 30 days after sowing (DAS), every four days interval infested leaves was counted and continued upto 54 DAS (i. e., 30, 34, 38, 42, 46, 50 and 54 DAS). Plant height (cm) was measured only just before the harvesting by meter scale. Number of pods per plants was counted after the pod maturation. Yield of soybean as grain were determined for each individual plots (4 m x 2.5 m i. e., 10 m²) and then converted to t ha^-1. The collected data were analyzed statistically using a computer based package programme MSTAT-C and Duncan’s Multiple Range Test (DMRT) was used to separate the means.

Source of Information: J. Agrofor. Environ. 2(1): 1-6, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that ‘Albida and soybean’ based agroforestry production system is susceptible to insect infestation; whereas ‘Jahu and soybean’ and ‘Akashmoni and soybean’ based agroforestry production system are relative by resistant to insect infestation.

Knowledge Management: Journal