Paper Information

Title: 

ESTIMATION OF YIELD LOSS OF CHITTI BEAN (PHASEOLUS VULGARIS. L) CAUSED BY JIMSON WEED (DATURA STRAMONIUM INTERFERENCE WITH USE OF DESCRIPTIVE MODEL BASED ON DENSITY AND RELATIVE TIME OF WEED EMERGENCE

Type: PAPER
Author(s): KHANJANI MOHSEN,MAHMOODI SOHRAB,JAMI ALAHMADI MAJID,GHANBARI ALI AKBAR
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

AN EXPERIMENT WAS CONDUCTED IN NATIONAL BEAN RESEARCH STATION, IN KHOMEIN, IN 2006, IN ORDER TO ESTIMATE OF YIELD LOSS OF CHITTI BEAN (PHASEOLUS VULGARIS. L) CAUSED BY JIMSON WEED (DATURA STRAMONIUM INTERFERENCE, USING OF CAUSENS DESCRIPTIVE MODEL OF DENSITY AND RELATIVE TIME OF WEED EMERGENCE. THE EXPERIMENTAL DESIGN WAS A RANDOMIZED COMPLETE BLOCK WITH A FACTORIAL ARRANGEMENT IN THREE REPLICATIONS. TREATMENTS WERE FOUR DIFFERENT WEED DENSITIES (4, 8, 12 AND 16 PLANT M-1) AND THREE TIMES OF WEED EMERGENCE (WITH CROP EMERGENCE, IN FIRST TRIFOLIATE LEAF STAGE AND THIRD TRIFOLIATE LEAF STAGE OF BEAN) IN COMPETITION WITH BEAN (40 PLANT M-1) AND A WEED FREE TREATMENT AS CONTROL. RESULTS INDICATED THE SEVER SENSITIVITY (71% LOSS) OF BEAN YIELD IN COMPETITION WITH JIMSON WEED. THE CAUSENS DESCRIPTIVE MODEL OF DENSITY AND RELATIVE TIME OF WEED EMERGENCE HAD ACCEPTABLE ESTIMATION OF BEAN YIELD LOSS CAUSED BY JIMSON WEED AND THERE WAS NO SIGNIFICANT DIFFERENCE BETWEEN OBSERVED AND ESTIMATED DATA WHEN A LINEAR REGRESSION ANALYSES WAS USED. ACCORDING TO ESTIMATION OF THIS MODEL, THE ECONOMIC THRESHOLD OF JIMSON WEED DENSITY (FOR 7% OF BEAN YIELD LOSS) WERE 0.8, 1.6 AND 2.5 PLANT M-1 FOR FIRST, SECOND AND THIRD RELATIVE TIME OF WEED EMERGENCE RESPECTIVELY.

 
Keyword(s): SIMULATION, EMPIRICAL MODELS, DENSITY, RELATIVE TIME OF WEED EMERGENCE
 
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