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Title

DETERMINATION OF MENTHA PIPERTIA L. WATER REQUIREMENT AND SINGLE CROP COEFFICIENTS IN A SEMI-ARID CLIMATE

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Abstract

 TO DEVELOP A PROPER IRRIGATION MANAGEMENT PROGRAM, DETERMINATION OF CROP WATER REQUIREMENTS AND CROP COEFFICIENTS DURING GROWTH STAGES IS ESSENTIAL. PEPPERMINT (MENTHAPIPERITA L.) IS AMONG THE MOST IMPORTANT MEDICINAL PLANT, USED IN FOOD, SANITARY AND COSMETIC INDUSTRIES. BUT, WATER REQUIREMENT AND CROP COEFFICIENT OF THIS PLANT HAS NOT BEEN DETERMINED IN IRAN AND ALL OF WORLD, YET. THEREFORE, THE PRESENT STUDYWAS CONDUCTED TO DETERMINE SINGLE CROP COEFFICIENTS OF PEPPERMINT IN A SEMIARID CLIMATE BY USING WATER BALANCE LYSIMETER DURING 2012 AND 2013. FOR THIS PURPOSE, SIX WATER BALANCE DRAINABLE LYSIMETERS IN THE LYSIMETER STATION BELONG TO DEPARTMENT OF IRRIGATION AND WATER RESOURCES ENGINEERING IN CAMPUS OF AGRICULTURE AND NATURAL RESOURCE, RAZI UNIVERSITY, WERE USED. FOR THESE REASONS, THREE LYSIMETERS WERE USED FOR GRASS EVAPOTRANSPIRATION AND IN THREE LYSIMETERS, PEPPERMINT WAS PLANTED. TWO-YEARS AVERAGE WATER REQUIREMENT OF PEPPERMINT WERE DETERMINED AS 646 MM. SINGLE CROP COEFFICIENT FOR THE INITIAL, DEVELOPMENT AND MIDDLE STAGES WERE DETERMINED AS 0.66, 1.04 AND1.28 RESPECTIVELY.

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