Evaluation of Growth Indices and Diversity of Weeds in Replacement and Additive Intercropping Series of Ajowan (Trachyspermum ammi L.) with Bean (Phaseolus vulgaris L.)

Document Type : Research Paper

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Abstract

In order to evaluate the different intercropping series of Ajowan with bean on diversity, density, total dry weight and ecological diversity indices for weeds, a field experiment was conducted based on a randomized complete block design with three replications at the Agricultural Research Station, Shirvan College of Agriculture and Natural Resources during growing season of 2012-2013. Treatments were eight series of replacement and additive intercropping of Ajowan with bean included 0:100, 25:75, 50:50, 75:25, 100:0, 100:50, 25:100 and 50:100. Sampling of weed population was done at three stages. The results showed that the highest relative frequency in three stages were observed in lamb's quarters, wormseed mustard and Russian knapweed. At the first sampling stage, the maximum Shannon–Wiener index was calculated in bean monoculture (1.02) and the minimum was for 100% Ajowan+50% bean (0.45) at the third stage. The highest density (103 plants m-2) and dry weight of weeds (71.29 g m-2) were observed in bean monoculture and intercropping series declined these traits at three sampling stages. Intercropping decreased number, dry weight and ecological diversity indices of weeds through increasing crop diversity.  In general, combination of 100% Ajowan+50% bean was the most promising intercropping treatment. 

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Research in Crop Ecosystems
Volume 1, Issue 3 - Serial Number 3
December 2014
Pages 59-70

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