The effects of red root pigweed (Amaranthus retroflexus L.) interference on green bean (Phaseolus vulgaris L.) yield

Subject Areas : New Finding in Agriculture

B. Mirshekari ¹ (Islamic Azad University, Tabriz, Iran)

Received: 2015-12-08 Accepted : 2015-12-08 Published : 2007-08-23

Keywords: Interference, Green bean, Red root pigweed, yields,

Abstract :

      Study of weed competition with crops is necessary for better weeds management. In order to determine the interaction of some related traits with green bean yield on different times on interference on red root pigweed (RP), a two years experiment was conducted at Islamic Azad University of Tabriz, Iran. Experiment was based on randomized complete blocks design. The treatments were RP interference times (2, 4, 6, 8, 10 weeks after green bean emergence, full season interference and weed free plot as control). In all treatments RP was seeded immediately after green bean planting and removed after treatment levels. Results indicated that effect of treatments on all traits was significant. Interference of RP in four weeks of early growth stage of green bean has not significant effect on green cover at flowering stage of green bean. Green bean biomass in weed free plot (673.6 kg ha-1) was similar to treatments of two and four weekly RP interference in early growth stage of green bean. Also, pod yield in treatment of two weekly RP interference in early growth stage of green bean was similar to weed free plots. Yield loss of full season RP interference was 67% compared with control. In term of considering maximum permissible yield loss (10%) and results of this research, RP must be controlled, if its interference time was longer than 4 weeks in early growth stage of green bean.

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