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Paper Information

Title: 

COMPETITIVE EFFECTS OF EARLY WATERGRASS (ECHINOCHLOA ORYZICOLA (ARD) FISHER) AND BARNYARDGRASS (ECHINOCHLOA CRUSGALLI (L.) BEAUV) ON GROWTH PERIOD AND YIELD OF RICE (ORYZA SATIVA L.)

Type: PAPER
Author(s): GOLMOHAMMADI MOHAMMAD JAVAD,MOHAMMAD ALIZADEH HASAN,YAGHOUBI BIJAN,NAHVI MAJID
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

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

 
Keyword(s): RICE, BARNYARDGRASS, EARLY WATERGRASS, COMPETITION, YIELD
 
 
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