Water Requirements of Date palm Offshoots of Two Tissue-cultured cultivars (Mejhol and Khalas) Planted under climate conditions at mid Iraq 2- Measurement of crop coefficient of date palm offshoots tissue-cultured

Abstract

This study was conducted in Kut Palms station located at the entrance of Kut city ,right of Kut – Baghdad high way between longitudes 44o 32 ' and 46o 36 ' East and latitudes 31o 57 ' 32o 31 ' North "by 2014-2013, in loamy soils, to study the water requirements for palm offshoot Palm variety (Majhol and Khalas) Palm propagation by tissue culture, and planted under drip irrigation system under the climatic conditions of the areas of central Iraq, through the study of the effect of the ratio of moisture depletion from available water and leaching requirements ratio L.R. and Palm variety on actual water consumption ETa for palm propagation by tissue culture and planted under the climatic conditions of the Wasit Governorate, and also study the impact of the aforementioned study factors on the distribution of moisture and salts in study site soil, as well as calculate reference water consumption ETo, by using five empirical equations (evaporation basin, Bliny – Kridel, Najib kharufah, Jensen – Hess, amended Penman-Monteith), Depending on the climatic data of meteorological station in Kut. The results showed that the values of the crop coefficient Kc for palm offshoots planted under the studied treatments , increasing the values of the crop coefficient Kc at the beginning of the first months of the cultivation of offshoots (June, July, August, September 2013) and then begins to decline starting in October 2013 and then begin to increase starting from February 2014 until the end of the months of study (June 2014), where the lowest value of the crop coefficient Kc is 0.07 for treatments D2LR1V2 and D2LR1V1 for the month of January 2014 and the highest value of the crop coefficient Kc was 0.97 for treatments D1LR2V1 and D1LR2V2 for the months of May and June 2014. The results showed that values of coefficient evaporation basin of crop Kpc for the study treatments followed a similar behavior to the crop coefficient Kc, where the lowest value for Kpc to treatments D2LR1V2 and D2LR1V1 during the month of January 2014 is 0.11 and the highest value of Kpc was 0.6 for treatments D1LR2V1 and D1LR2V2 during the month of June/2014.