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Dimensions of the research area are, x, mwhich constitutes a total of m.The research was conducted in random blocks test pattern with replications, by taking different irrigation levels and nonirrigated subject into account. The trial subjects taken into account are explained below.In the research, the soil moisture content was determined gravimetrically in cm soil depth for each cm soil layer.Effective root depth was cm and evapotranspiration rates were calculated with respect to cm soil depth, according to water budget approach, the single and dual crop coefficients approach was used.Pepper single crop coefficients which was determined according to the water budget approach,   to the reference evapotranspiration.In the calculation of evapotranspiration by the use of reference evapotranspiration, dual crop coefficients were used.Wateryield functions were determined with reference to the relations between applied irrigation water and measured evapotranspiration, and harvest efficiency.By adding the weights of marketable products acquired from the harvest parcel and then proportioning it to the hectare, total yield was calculated.As can be followed on the figure, it took the crop approximately days to reach the first harvest maturity in within the fruit growth <a href="https://www.ncbi.nlm.nih.gov/pubmed/18556090"></a> period and approximately days in during the same period.The whole growing season was completed in and days,respectively.In the research, the growth periods of the pepper plant were defined as early vegetative growth period, late vegetative growth period, generative growth period and the period of loss in vegetative parts.When researches conducted under different regional conditions and with different pepper types are studied with FAO, the growing season of pepper is divided into growth periods.The measured values of total evapotranspiration for trial subjects throughout the growing season vary between mm and mm for the year, and between mm and mm for the year. As can be seen on the table, the highest amount of irrigation water and the highest evapotranspiration belong to subject I in both years.And the lowest evapotranspiration belongs to the nonirrigated subject to which no irrigation water was applied throughout the season.When the two years of experiment are compared, the fact that precipitation was higher in the first year than the second, has decreased the amount of irrigation water even though the number of irrigation times were the same.Seasonal evapotranspiration values are found to be relatively close.In both years, actual evapotranspiration values are found to be higher than the calculated values.Due to the fact that bare soil surface with limited crown area was wider at the beginning of the growing season, fc values were low and showed an increasing trend while few values were high and showed a decreasingtrend.The amount of total evaporable water was calculated as mm for the year and as mm for the year. And the amount of readily evaporable water was taken to be mm, based on the table value for clayed soil texture in FAO. Soil evaporation coefficient is high when the vegetation cover is the lowest at the beginning of the plant growing period.The highest average yields are attained from irrigation level I which was assumed to fully meet the irrigation needs of the plant.

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