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Effect of Intercropping with Mustard with Onion and Garlic on Aphid Population and Yield

P K Sarker
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

M M Rahman
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

B C Das
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

Field experiments were conducted to study the effect of intercropping of mustard (Brassica napus, Var. Bari Sarisha-7) with onion (Allium cepa L.) and garlic (Allium sativum L.) on aphid [Lipaphis erysimi (Kaltenbach)] population and yield. Intercropped with these two medicinal as well as spice crops reduced the aphid population significantly (P<0.05). Mustard blocks intercropped with garlic gave highest cost-benefit ratios (1:2.07 and 1: 2.96) than onion intercropped blocks. Sole mustard blocks produced lowest cost-benefit ratios (1:1.65 and 1:2.06).

Keywords: Intercropping, Onion, Garlic, Agronomic benefits, Mustard, Aphid.

Location: Research field of Zoology Department, Rajshahi University Campus

Start Date:

End Date:

Program Area: Farming System

Non-commodity: Performance

Objectives:

The present study was undertaken to find out the effect of intercropping on aphid abundance, yield of mustard crops and total agronomic benefits using onion and garlic plants.

Methodology:

Experimental design: Field trials were conducted during the winter season of 2005-2006 and 2006-2007 in the research field of Zoology Department, Rajshahi University Campus. Mustard (Brassica napus var. Bari Sarisha-7) with local varieties of onion (A. cepa) and garlic (A. sativum) were selected for intercropping. Altogether 9 blocks (each 1 sq. meter) were prepared and 3 replications for each category [onion+mustard, garlic+mustard and mustard (sole)] were taken for this experiment. Equal amount of fertilizer (as used in mustard as suggested by BARI) (Mondol and Wahhab 2001) was used and two times irrigation (as need) were done in the field. Mustard seeds sown in the blocks randomly and the onion (seed bulb) and garlic (clove) were planted in rows. Distance of sowing (onion and garlic) was maintained as: 30 cm from line to line (4 lines in each plot) and 10 cm from plant to plant (11 plants in each line). After germination, mustard plants which were very close to onion and garlic plants were uprooted. Counting of the aphids: Mustard plants were checked regularly for aphids. Whole plants were selected for aphid counting. Aphids were counted weekly through eye estimation without disturbing the colony. Counting was made from the onset of aphid in the station till their disappearance or harvesting of the crops. Yield assessment: Harvested mustard seed, onion and garlic were weighed and estimated their prices in local markets to calculate the effect of intercropping and cost benefit ratio among sole and intercropped blocks. Data analysis: Analysis of variance (ANOVA) was carried out to test the significant difference of aphid population among intercropped and sole mustard blocks. Comparison of means was undertaken using Duncan’s Multiple Range Test (DMRT). The gross returns of sole and intercropped blocks were tested by ANOVA and ranked by DMRT.

Source of Information: J. bio-sci. 15: 35-40, 2007, ISSN 1023-8654

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the present result it may be concluded that mustard could be grown with onion and garlic as standard intercropping to get more economic benefit and avoid aphid infestation up to economic threshold level.

Knowledge Management: Journal