القسم: مديرية بحوث المياه والتربة
الجهة البحثية: المركز الوطني للبحوث الزراعية
عنوان البحث المنشور:
Determination Actual Evapotranspiration and Crop Coefficients of Date Palm Trees (Phoenix dactylifera) in the Jordan Valley
سنة النشر: 2012
ملخص البحث المنشور:
The date palm actual evapotranspiration (Etc) and crop coefficient of Medjool cultivar (Phoenix dactylifera) under different water regimes (50, 75. 100 and 125% of Etc) were determined at the Central Jordan Valley during 2011 growing season using Randomized Complete Block Design (RCBD). Twelve years age old date trees with eight meter spacing between trees and rows were used.The experimental plot size contained 12 trees using full automated drip irrigation supplied with fertigation system. Water balance budget method using Neutron Probe technique was used to determine Etc. The required climatic data for estimation of reference crop potential evapotranspiration using Penman-Montieth method were collected from a nearby climatic station. The seasonal amounts of applied irrigation water per date palm tree were 27, 40, 53 and 67 m 3 for the irrigation treatments 50, 75, 100 and 125% Etc respectively, while the precipitation during the growing season was 245 mm. The annual measured date palm tree Etc values were 1327, 1639, 1828 and 1987 mm, for the studied irrigation treatments, respectively, while the estimated potential evapotranspiration was 1920 mm with kc ranged between 0.5 to 1.18 during the growing season. The Medjool crop yield were 33.46, 35.98, 37.8 and 42.49 kg per tree with water productivity of 1.25, 0.90, 0.71 and 0.64 kg m for the 50, 75. 100 and 125% of Etc,-3, respectively, also the date palms yield and growth parameters were significantly affected by irrigation treatments and second degree polynomial relationship between the water applied and crop production was obtained also. The application of 50 and 75% of Etc was significantly increased the soil salinity by 1.5 to 3.7 units at the end of the growing season, while no significant effect when applying 100 and 125% of Etc.
رابط البحث المنشور:
https://www.researchgate.net/publication/319277130_Determination_Actual_Evapotranspiration_and_Crop_Coefficients_of_Date_Palm_Trees_Phoenix_dactylifera_in_the_Jordan_Valley