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Paper Information

Title: 

INFLUENCE OF DIFFERENT AMOUNTS OF WHEAT RESIDUES AND TILLAGE SYSTEMS ON SOIL SEED BANK AND WEEDS IN SUNFLOWER (HELIANTHUS ANNUS)

Type: PAPER
Author(s): MOHAJERI FARHAD,GHADIRI HOSSEIN,BAHRANI MOHAMMAD JAFAR
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

PRESENT STUDY WAS CONDUCTED AT THE RESEARCH STATION OF AGRICULTURAL COLLEGE, SHIRAZ UNIVERSITY, IN 2006-2007 AND 2007- 2008 IN ORDER TO EVALUATE THE EFFECTS OF DIFFERENT LEVELS OF TILLAGE AND WHEAT RESIDUES ON SOIL SEED BANK AND WEEDS IN SUNFLOWER. A SPLIT-PLOT DESIGN WAS USED. THE TREATMENTS WERE MINIMUM (1 CHISEL+2 DISK), MODERATE (2 CHISEL+2DISK) AND CONVENTIONAL (1 MOLD BOARD+2 DISK) TILLAGE AS MAIN FACTOR, AND RESIDUE AMOUNT IN FOUR LEVELS (0, 25, 50 AND 75%) AS SUB FACTOR. THE WHEAT RESIDUES WERE FROM MARVDASHT CULTIVAR, AND ZARIA CULTIVAR WAS USED FOR SUNFLOWER PLANTING. THE SOIL SEED BANK WAS EVALUATED 3 TIMES AT PRE, MID AND THE END OF GROWING SEASON IN 2 DEPTHS OF 0-15, 15-30 CM AND RESULTS SHOWED THAT; WITH TILLAGE REDUCTION AND THE INCREASE IN RESIDUE AMOUNT, THE SEED BANK INCREASED SPECIALLY IN SURFACE LAYER OF SOIL, HOWEVER, NO SIGNIFICANT DIFFERENCE WAS SEEN BETWEEN MODERATE AND MINIMUM TILLAGE IN WHICH MOLD BOARD PLOW WAS NOT APPLIED. IN ADDITION, THE SEED BANK IN RESIDUE AMOUNTS OF 50 AND 75% DIDN’T SHOW ANY SIGNIFICANT DIFFERENCE. THE SEED BANK DIDN’T HAVE SIGNIFICANT DIFFERENCE IN MID AND THE END OF GROWING SEASON, AND THIS WAS BECAUSE OF MORE EFFECTIVE TILLAGE INFLUENCE ON THE SEED BANK THAN AMOUNTS OF PLANT RESIDUES ON THE SEED BANK. THE VARIATIONS IN WEEDS DRY WEIGHT AND DENSITY DURING THE GROWING SEASON SHOWED THAT; ONLY THE HIGHEST AMOUNT OF RESIDUE (75%) CAN HAVE SIGNIFICANT EFFECT ON REDUCTION OF WEEDS DRY WEIGHT AND DENSITY. ALSO IN RELATION TO TILLAGE, ONLY CONVENTIONAL TILLAGE HAD SIGNIFICANT EFFECT ON REDUCTION OF WEEDS DRY WEIGHT AND DENSITY. THIS EXPERIMENT SHOWED THAT THE TYPE OF TILLAGE HAS MORE EFFECTIVE ROLE IN WEED CONTROL THAN RESIDUE AMOUNT.

 
Keyword(s): SUNFLOWER, SEED BANK, WHEAT RESIDUE, TILLAGE SYSTEM, WEED
 
 
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