Grapevine (Vitis vinifera L.) Yield and Climate Conditions of Palestine
Grapevine (Vitis vinifera L.) is one of the most important crops in Palestine, and comes second only to olives in economic terms and production, grape is one of the most sensitive fruit trees to climate conditions , especially temperature and rainfall. We analyzed climate, bio-climate factors and grape production at Jenin region, and the bio-climate, climatic factors were obtained according of Rivas Martinez to classification of the earth program. However, bio-climate factors included compensated thermicity index, water deficit, annual ombrothermic index and simple continentality index; whereas climate factors were mean monthly temperature, precipitation, and soil water reserve. The data used were from one meteorological station of the Palestinian Meteorological for the years 1993 to 2006 (14 years), with the same years of grape production (rain-fed) from the Palestinian Central Bureau of Statistics (PCBS). In concluded, when we applied a Principal Component Analysis, observed that the Jenin type plots are located at the left of axis 1 during (1993-1996) negatively affected on grape yield by precipitation, with a proportion of the variance explained by axes 1 (65.95 %), but the bioclimate factor as annual ombrothermic index and simple continental index were a affected positively. Moreover, grapes are environmental adapted in mesomediterranean regions, with the value of compensated thermicity index is 220-350, annual ombrothermic index < 3, simple continental index is 15-18, mean monthly temperature is 15-20oC, and with precipitation is 450-950 mm.
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