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Paper Information

Title: 

GROWTH ANALYSIS OF CORN (ZEA MAYS) IN COMPETITION WITH COMMON COCKLEBUR (XANTHIUM STRUMARIUM) AND JIMSONWEED (DATURA STRAMONIUM)

Type: PAPER
Author(s): KARIMMOJENI H.,RAHIMIYAN MASHADI H.,ALIZADEH H.M.
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

FIELD EXPERIMENTS WERE CONDUCTED IN 2006 AND 2007 TO COMPARE THE GROWTH CHARACTERISTICS OF TWO WEEDS SPECIES, X.STRUMARIUM AND D.STRAMONIUM, IN COMPETITION WITH CORN. X.STRUMARIUM AND D.STRAMONIUM WERE ESTABLISHED AT SELECTED DENSITIES WITHIN 15 CM ON EITHER SIDE OF THE CORN ROW. FUNCTIONAL GROWTH ANALYSIS SHOWED THAT CORN HAD THE HIGHEST VALUES FOR DRY MATTER (TDM), LEAF AREA INDEX (LAI) AND CROP GROWTH RATE (CGR), WHILE D.STRAMONIUM HAD THE LOWEST IN BOTH SINGLE AND MULTI-SPECIES WEED COMPETITION.WITH INCREASE IN DENSITY AND PROPORTION OF TWO WEED SPECIES, X.STRUMARIUM AFFECTED THE GROWTH CHARACTERISTICS OF CORN MORE THAN D.STRAMONIUM. THAT IS, THE HIGHEST DENSITY (16 PLANTS M-2) OF X.STRUMARIUM CAUSED 47% AND 26% REDUCTION IN MAXIMUM CORN LAI (MCLAI) IN 2006 AND 2007, RESPECTIVELY. HOWEVER, D.STRAMONIUM AT SAME DENSITY REDUCED MCLAI BY 14 AND 12% IN 2006 AND 2007, RESPECTIVELY. AT THE HIGHEST DENSITY, X.STRUMARIUM ALSO RESULTED IN 54% REDUCTION IN MAXIMUM CORN GROWTH RATE (MCGR) IN 2006 AND 38% IN 2007. MCGR REDUCTIONS FROM THE HIGHEST DENSITY OF D.STRAMONIUM WAS NOTICEABLY LOWER THAN THOSE OF X.STRUMARIUM WITH 32 AND 35% REDUCTIONS OBSERVED IN 2006 AND 2007, RESPECTIVELY.MAXIMUM CORN TOTAL DRY MATTER (MCTDM) DECREASED BY 52 AND 46%, WHEN SOWN IN COMPETITION WITH THE MAXIMUM X.STRUMARIUM POPULATION IN 2006 AND 2007 RESPECTIVELY, WHILE (MCTDM) LOSSES FROM D.STRAMONIUM WERE NEVER MORE THAN 29% OR 31% IN 2006 AND 2007, RESPECTIVELY. IT SEEMS THAT WEED CONTROL PROGRAMS FOR MIXED POPULATION OF THESE TWO WEED SPECIES SHOULD PUT SUPERIORITY FOR THE CONTROL OF X.STRUMARIUM BECAUSE OF ITS HIGH GROWTH CHARACTERISTICS.

 
Keyword(s): GROWTH ANALYSIS, WEED COMPETITION, DENSITY, COMMON COCKLEBUR, JIMSONWEED, CORN
 
 
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