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Title

DIFFERENT SEVERITIES OF SIMULATED GRAZING AND YEARLY PRECIPITATION EFFECTS ON FESTUCA OVINA IN MAJIDABAD RANGELANDS, KURDISTAN, IRAN

Writers

ZAHEDI S.

Pages

 Start Page | End Page

Abstract

 FOR ASSESSING CLIPPING (SIMULATED GRAZING) AND YEARLY PRECIPITATION EFFECTS ON FESTUCA OVINA AS AN IMPORTANT SPECIES, AN EXCLOSURE FIELD ESTABLISHED BEFORE 2007 GROWING SEASON IN MAJIDABAD PADDOCK. INSIDE THE EXCLOSURE AREA, 40 PLANTS SELECTED OF WHICH 10 REPLICATIONS ALLOCATED TO EACH SPECIFIC TREATMENT OF OCULAR-ESTIMATED HAND CLIPPING OF THE 25, 50 AND 75 PERCENT OF ANNUAL GROWTH. 10 REPLICATIONS WERE ASSIGNED AS CONTROL (UNCLIPPED) PLANTS. CLIPPINGS WERE DONE MONTHLY DURING THE THREE MONTHS OF CURRENT GRAZING SEASON. MONTHLY-CLIPPED PLANT MATERIALS WERE DRIED IN FREE AIR TO CALCULATE THE ACCURATE CLIPPING INTENSITY. ALTHOUGH THE RESIDUES OF ALL PLANTS (ALSO CONTROLS) CLIPPED AND DRIED SIMULTANEOUSLY AT THE END OF GROWTH SEASON. THE STUDY WAS DONE FOR 4 YEARS. SPLIT PLOT IN TIME WAS USED AS THE STATISTICAL DESIGN AND ANALYSIS. THE RESULTS SHOWED THAT THE MAIN EFFECT OF YEAR AND DIFFERENT CLIPPING INTENSITIES AND INTERACTIONS EFFECT OF DIFFERENT CLIPPING INTENSITY AND YEARS ARE SIGNIFICANT ON FORAGE PRODUCTION BUT INDICATED NO SIGNIFICANT DIFFERENCE ON FINAL HEIGHT AND NUMBER OF GENERATION CULM. MOST AND LEAST AMOUNT OF PRODUCTION IS RELATED TO 2007 AND 2008 YEARS WITH 508 AND 167 MM OF RAINFALL RESPECTIVELY AND 75% TREATMENT (SEVERE CLIPPING). AS THE OVERALL CONCLUSION, REGARDING THE ENVIRONMENTAL AND MANAGEMENT VARIATIONS OF THIS SPECIES, IT IS ADAPTED WITH LIGHT TO MODERATE CLIPPING (25- 50%) AND MAXIMUM GRAZING ALLOWANCE TO HALF OF THE ANNUAL YIELD GROWTH.

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