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Paper Information

Title: 

THE EFFECT OF NITROGEN ON CRITICAL PERIOD FOR WEED CONTROL IN POTATO

Type: PAPER
Author(s): NATEGHI GHOLAMALI,MOHAMMADDUST HAMIDREZA
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

THE CRITICAL PERIOD FOR WEED CONTROL (CPWC) IS THE PERIOD IN THE CROP GROWTH CYCLE DURING WHICH WEEDS MUST BE CONTROLLED TO PREVENT UNACCEPTABLE YIELD LOSSES. A FIELD RESEARCH WAS CONDUCTED IN 2007 IN ARDABIL, IRAN, TO EVALUATE THE EFFECT OF NITROGEN ON BEGINNING AND ENDING OF CRITICAL PERIOD FOR WEED CONTROL IN POTATO. NITROGEN FERTILIZER WAS APPLIED AT RATES EQUIVALENT TO 0, 100 AND 200 KG N HA-1. A QUANTITATIVE SERIES OF TREATMENTS OF BOTH INCREASING DURATION OF WEED INTERFERENCE AND LENGTH OF WEED-FREE PERIOD (0, 20, 40, 60 AND 8 ADE) WERE IMPOSED WITHIN EACH NITROGEN MAIN PLOT. ANALYSIS SHOWN THAT 200 KG N HA-1 APPLICATION COMPARED WITH 0 AND 100 KG N HA-1DECREASED WEED DENSITY AND INCREASED WEED DRY MASS.100 KG N HA-1 APPLICATION DECREASED ANNUAL WEED DENSITY, ESPECIALLY AMARANTHUS RETROFLEXUS. RESULTS SHOWN THAT THE ADDITION OF 100 KG N HA-1 DELAYED THE BEGINNING OF THE CPWC IN POTATO WHEN COMPARED WITH THE 0 AND 200 KG N HA-1. THE BEGINNING OF THE CPWC IN POTATO OCCURRED 8, 12 AND 7 DAE IN PLOTS RECEIVED 0, 100 AND 200 KG N HA-1 RESPECTIVELY. NITROGEN APPLICATION HASTENED THE ENDING OF THE CPWC IN POTATO. THE ENDING OF THE CPWC IN POTATO OCCURRED 33 AND 35 DAE WHEN 100 AND 200 KG N HA-1 APPLIED RESPECTIVELY. MAXIMUM VALUES FOR POTATO YIELD BELONGED TO THE WEED FREE PLOTS AND100 KG N HA-1. PRACTICAL IMPLICATIONS OF THIS STUDY ARE THAT 100 KG N HA-1 COULD HAVE BEEN LESS INTENSIVE FOR WEED MANAGEMENT THAN 0 AND 200 KG N HA-1.

 
Keyword(s): POTATO, NITROGEN FERTILIZER, CRITICAL PERIOD, WEED CONTROL, WEED DENSITY
 
 
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