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Paper Information

Journal:   IRANIAN JOURNAL OF FIELD CROPS RESEARCH   2004 , Volume 1 , Number 2; Page(s) 155 To 166.
 
Paper: 

INVESTIGATION ON THE MECHANISMS OF COMPETITION OF BARNYARDGRASS (ECHINOCHLOA CRUS-GALLI) AND RED ROOT PIGWEED (AMARANTHUS RETROFLEXUS) WITH DRY BEAN (PHASEOLUS VULGARIS)

 
 
Author(s):  IZADI DARBANDI E., RASHED MOHASEL M.H., NASSIRI M., MAKARIAN H.
 
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Abstract: 

To study the mechanisms of competition of barnyardgrass and redroot pigweed with dry bean, an additive experiment was conducted at farm of Ferdowsi University of Mashhad experimental station. The experiment was laid out in completely randomized block (CRB), with three replications. Treatments included three levels of redroot pigweed densities (4, 8, 12 plant/m2) and three levels of barnyardgrass (10, 20, 30 plant/m2) planted at constant density of dry bean (20 plant/m2) plus weed free check in each block. Results showed total dry matter (TDM), growth rate, height and bean leaf area of bean decreased significantly. In all above parameters, redroot pigweed was more effective on dry bean than barnyardgrass. Meanwhile, excluding the early season growth, redroot pigweed growth index curves exceed from bean. However, in barnyardgrass except the end of the season (bean physiologycal ripening period) growth index curves were lower than bean. Higher height and leaf position of redroot pigweed in mix canopy from early season resulted in being redroot pigweed more competitive for light than bean. However, barnyardgrass weakness in latter two parameters during growing season was the main reason for its weakness for light competition. Apparently, barnyardgrass imposed its competetive effects via partitioning the assimilates to roots wherease, redroot pigweed, imposed its competitive from roots and mainly foliages.

 
Keyword(s): COMPETITION, DRY BEAN, BARNYARDGRASS, REDROOT PIGWEED, YIELD AND GROWTH INDEXES
 
References: 
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