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Citrus is suggested to be one of the most important fruit crops all over the world, especially in warm temperate regions, occupied the third position between fruit crops in the world after grapes and apples.

Sweet oranges the main grown citrus species in world, Valencia orange cv, ranks the first position between different Sweet oranges kinds all over the world.

Salinity of soil and irrigation water regimes and drought conditions are considered to be serious and major problems that faces Valencia orange growers in the dry regions, also, alkaline soils and mal-nutrition reduced citrus production.

http://wabobatta-egyptiongardens.blogspot.com/2015/09/growth-and-fruiting-of-valencia-orange_5.html