Effects of different irrigation times on photosynthetic water use efficiency of the second crop maize and its relation with other leaf characteristics

ABSTRACTM.Sc. THESISEFFECTS OF DIFFERENT IRRIGATION TIMES ON PHOTOSYNTHETIC WATER USEEFFICIENCY OF THE SECOND CROP MAIZE AND ITS RELATION WITH OTHERLEAF CHARACTERISTICS¢ü¦¤£¢   © § Â¥ ¡DEPARTMENT OF FIELD CROPSINSTITUTE OF BASIC AND APPLIED SCIENCESÇUKUROVA UNIVERSITYSupervisor : Prof. Dr. Müjde KOÇYear : 2006 Pages :130Jury :ppPProf. Dr. Müjde KOÇppPProf. Dr. Attila YAZARppPProf. Dr. Ahmet Can ÜLGERThe objective of this study was to determine the effects of different irrigation times onthe photosynthetic water use efficiency of second crop maize and its relation with other leaftraits. The study was conducted at Ç.Ü. Agriculture Faculty, Agricultural Structures andIrrigation Departments Experimental Field at 2005, and ARMA maize variety was sed.Three different irrigation treatments (I40-I60-I80) were considered in this study. Intreatment I40, irrigation water was applied when 40% available soil water content in the 90cm soil profile was depleted. In I60 and I80 treatments, irrigation was applied when 60 and80% of available water in 90 cm soil profile was depleted respectively. Deficit water wasreplenished to field capacity in all treatments. Highest FSKE of 142.3 mmol H2O m-2s-1, wasobtained in I60; minimum FSKE of 125.3 mmol H2O m-2s-1, was estimated in I80 treatmentplots. Biomass increased with irrigation frequency (I40>I60>I80). Corn grain yields were notsignificantly different among the treatments. However, there was a trend of higher yield infrequently irrigated treatment in the order of I40, I60 and I80. The effect of irrigationtreatments on investigated leaf characteristics are not significantly different.Key Words : Maize, irrigation, LAI, net photosynthesis, chlorophyll, biomass.