Determination of the economic threshold of damage of red root pigweed (Amaranthus retroflexuxs L.) in green bean (Phaseolus vulgaris L.) field

Subject Areas :

Bahram  Mirshekari ¹ (Assistant Professor of Islamic Azad University, Tabriz Branch)
Adel  Dabbagh Mohammadi Nasab ² (Assistant Professor of Tabriz University)
Mahmood  Pouryousef ³ (Assistant Professor of Islamic Azad University, Mahabad Branch)

Received: 2006-12-01 Accepted : 2007-05-18 Published : 2007-03-21

Keywords: Green bean, Yield loss, Economic Threshold, Red root pigweed, full season interference,

Abstract :

     In order to determine the economic threshold of damage of red root pigweed (RP) in green bean, a two years experiment was conducted in agricultural research station of Islamic Azad University of Tabriz, Iran, based on a randomized complete block design with three replications. The treatments were RP interference times at 2, 4, 6, 8, 10 weeks after green bean emergence until late growth season (GBE); full season interference (FSI) and control weed free plot. Data were analyzed with Mstatc software and Duncan's test was used for mean comparison. Results showed that the above ground biomass and yield of green bean in control plot was similar to treatment of weed interference at 10 weeks after GBE. Yield loss in FSI was 67.36% in comporison to control. RP emergence at density of 8 plants-m-1 of row at early 6 and 8 weeks of green bean growth stage to later, was caused 21.5% and 6.2% yield loss, respectively, in comparison to control. With attention to 10% maximum permissible yield loss in green bean, RP must be controlled, if it was emerged within a period of 6 weeks of early green bean growth stage and economic threshold of damage of RP at studied density level was determined until 6 weeks of early green bean growth stage.

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