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Performance of Kangkong as Intercrop Grown in Association with Three Years Old Karanja Tree

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

F. Bithi
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh-2202

Z. Alam
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh-2202

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

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

Abstract/ Executive Summary:

A field experiment was conducted to evaluate the effect of Karanja (Pongamia pinnata) on the growth and yield of Kangkong (Ipomoea reptans) as vegetables grown in association with Karanja. The experimental site was located at SPGR sub–project experiment field, Char Kalibari, Mymensingh, during February 2013 to May 2013, under the Department of Agroforesty, Bangladesh Agricultural University, Mymensingh. The experiment was designed following Randomized Complete Block Design (RCBD) with three replications. The distance from tree base was treated as experimental treatment. Three different distances viz. 0-2.5 ft, 2.5-5 ft, and 5-7 ft from tree base were the three different treatments of the study. There was a control treatment i.e. Kangkong and Karanja were cultivated in the open field condition. So the four treatments of this study were T₀ (open field condition referred as control), T₁ (2.5 ft distance from the tree base), T₂ (5 ft distance from the tree base) and T₃ (7.5 ft distance from the tree base). Growth of Karanja tree also observed during the Kangkong cultivation period. The results showed that Kangkong yield was gradually increased with increasing distance from the Karanja tree base. In T₀ T₁, T₂ and T₃ the yield were 58.6 t/ha, 40.71 t/ha, 48.23 t/ha and 57.19 t/ha respectively. The yield produced in open field (T₀) and T₃ (5-7 ft distance from tree base) were statistically similar and there is no significant variation. Therefore, Karanja tree base is suitable for cultivation of Kangkong without significant yield loss compared to that of control.

Keywords: Kangkong, Karanja, Char land, Agroforestry

Location: Department of Agroforesty, Bangladesh Agricultural University, Mymensingh

Start Date: 00-02-2013

End Date: 00-05-2013

Program Area: Farming System

Commodity: Karanja, Kangkong

Objectives:

1. To examine the performance of Kangkong vegetables when grown in association with Karanja tree sapling in a tree- crop agroforestry system.

Methodology:

The experiment was carried out at Char Kalibari which is situated by the side of Brahmaputra River adjacent to the Bangladesh Agricultural University, Mymensingh, during the period from February 2013 to May 2013. In this study, the saplings of Karanja tree (Pongami apinnata) in combination with Kangkong (Ipomoea reptans) were used. The study was done under 3 year’s Karanja tree saplings. At first 0.04 feet deep pits were dug at 9 feet distance in the experimental field then the seedlings of the tree were placed. After the tree plantation sufficient irrigation was applied at the base of the tree. The Experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. The Kangkong plot size was 2.5 m x 2.4 m. Four tree-crop distance treatments were used. This were - T₀= Open field referred to as control,T₁= 2.5 feet distance from the tree, T₂= 5 feet distance from the tree,T₃= 7.5 feet distance from the tree. Kangkong seeds were sown on 15 March 2013. Kangkong seeds were shown maintaining the spacing of 30 cm and 15 cm. all necessary cultural operations were done for all crops.Kangkong was harvested four times at 15 days interval where the first harvest was done at 25 days after showing. Plant samples of Kangkong were collected randomly from the respective plots. Ten Kangkong plants were selected from each plot for data collection. Data were collected at 25, 40, 55 and 70 DAP (Day after planting) at 15 days intervals. The studied parameters were as plant height (cm), no. of leaves plant^-1, no. of branches plant^-1, length of branch^-1, stem girth, leaf weight/plant (g), stem weight/plant (g). Sample plants were weighted for fresh yield (expressed in gm) which was converted to t/ha. For determining the weight of leaves and weight of stem per plant the leaves were separated from stem and then weighted separately. The data on various growth and yield contributing characters of the vegetables was statistically analysed to examine the significant variation of the results due to different parameters. The analysis of variance for each of the character under study was done by F (variance ratio) test for Randomized Complete Block Design (RCBD). The treatments means were compared by Least Significant Difference (LSD) tested at 5% level of significance.

Source of Information: J. Agrofor. Environ. 7 (2): 155-158, 2013 ; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results showed that Kangkong yield was gradually increased with increasing distance from the Karanja tree base. In T₀ T₁, T₂ and T₃ the yield were 58.6 t/ha, 40.71 t/ha, 48.23 t/ha and 57.19 t/ha respectively. The yield produced in open field (T₀) and T₃ (5-7 ft distance from tree base) were statistically similar and there is no significant variation. Therefore, Karanja tree base is suitable for cultivation of Kangkong without significant yield loss compared to that of control.

Knowledge Management: Journal