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Allelopathic Effects of Albizia Lebbeck on Agricultural Crops

R. Parvin
Department of Agroforestry, Hajee Mohammad Danesh Science and Technology University, Bangladesh

M. H. A. Amin
Department of Agroforestry, Hajee Mohammad Danesh Science and Technology University, Bangladesh

T. L. Shapla
Assistant Professor
Department of Agroforestry & Environmental Science, Sher-e-Bangla Agricultural University, Bangladesh

Abstract/ Executive Summary:

A pot experiment was conducted at the Agroforestry Farm, Hajee Mohammad Danesh Science and Technology University during May 2009 to July 2009 to observe the allelopathic effects of Albizia lebbeck, two agricultural crops viz. mungbean and soybean. There were five treatments viz. T₁ (top soil); T₂ (root zone soil); T₃ (soil mulched with dry leaf); T₄ (soil watered with aqueous leaf extract); T₅(control/fresh garden soil). The experiments were laid out in the Randomized Complete Block Design (RCBD) with four replications. The results of the present studies revealed that inhibition of germination and growth parameters of mungbean and soybean were varied according to different parts of plants and soil from different place. Albizia lebbeck allelopathic effects of the treatments were as the following order: T₄ (soil watered with aqueous leaf extract)> T₂ (root zone soil) T₃ (soil mulched with dry leaf>T₁ (top soil)>T₄(control / fresh garden soil).

Keywords: Allelopathic effects, Agricultural crops, Mungbean, Soybean

Location: Agroforestry Farm, Hajee Mohammad Danesh Science and Technology University

Start Date: 00-05-2008

End Date: 00-07-2009

Program Area: Knowledge Management

Commodity: Performance

Objectives:

To observe the allelopathic effects of Albizia lebbeck, two agricultural crops viz. mungbean and soybean.

Methodology:

The experiment was conducted in the Agroforestry research field, Department of Agroforestry, Hajee Mohmmad Danesh Science and Technology University, Dinajpur. The experiment was conducted with single factor. RCBD (Randomized Complete Block Design) were applied with four replications. There were five treatments viz. T₁ (top soil); T₂ (root zone soil); T₃ (soil mulched with dry leaf); T₄ (soil watered with aqueous leaf extract); T₅(control/fresh garden soil). The selected test crops were Mungbean (Vigna radiata) and Soybean (Glycine max). The experimental pot size was 28.5 cm. × 22.5 cm and each pot containing 5 kg of soil as germination media. The treatment T₁- Top soil was collected from the native woodlots of the tree crops (depth of top soil is 15 cm), T₂- root zone soil collected from the root systems of tree crops from native woodlots (depth of root zone soil is 2 feet), T₃- Garden soil collected from experimental garden and oven dried crushed leaves (20 gms) mulched in the upper layers of each pot, T₄- Garden soil watered with aqueous extract of fresh leaves of tree crops, and T₅- Garden soil watered with ordinary water served as control. The pots were carried in the experimental field in 20^th April. After cleaning the weeds in the experimental field by spade, the pots were placed.32 pots were filled with top soil and 20 pots were filled with root zone soil in 7^th May. 20 pots were filled with garden soil in 8^th May.5% aqueous wash of the fresh leaves of tree was made in 21^th May and 100 ml of this extract was added to each of 20 pots which containing garden soil. Leaves of the trees were sun dried for 5 days. 20 g crushed leaves were added in each 20 pots as mulched in 20^th May. Other 4 pots were used as control and the pots were filled with ordinary garden soil. Source of the crops seed were BADC, Dinajpur and varieties were BINAMung-5 and BARI Soybean-5. 20 Seeds of crops were sown in each pot in 22^th May. The pots were watered regularly. Weeding was done periodically whenever necessary. Seed germination (%) was recorded after 14 days of sowing. Then all plants were uprooted except 5 plants in each pot. seedling attributes, such as length of shoot(cm), no. of leaves, leaf length(cm), leaflet breath(cm), shoot diameter(cm) were recorded at 26,36,46 and 56 days after sowing and root length(cm), root fresh weight(gm), shoot fresh weight(gm) were recorded at 62 days after sowing. Fresh roots and shoots were oven dried for three days and dry weights were recorded at 65 days after sowing. By using the sum of root dry weight and shoot dry weight, total biomass of the plants were found. The collected data on various parameters under different experiments were statistically analyzed using statistical program MSTAT-C to find out the statistical significance of the treatment effects. The means for all the treatments were calculated, and analysis of variance for all the characters were performed by the F-test. The significance of difference between the pair of means was evaluated by the Least Significant Difference (LSD) test.

Source of Information: Int. J. Sustain. Crop Prod. 6(1):50-57, 2011

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Inhibition of germination and growth parameters of mungbean and soybean were varied according to different parts of plants and soil from different place. Albizia lebbeck the allelopathic effects of the treatments were as the following the order: T₄ (soil watered with aqueous leaf extract ) > T₂ ( root zone soil) > T₃ (soil mulched with dry leaf) >T₁ (top soil) >T₄(control/fresh garden soil).

Knowledge Management: Journal