strawberry cultivation and its impact on the palestinian agriculture sector , empirical study for strawberry farming in gaza stripm %D8%B1%D8%B3%D8%A7%D9%84%D8%A9 %D9%85%D8%A7%D8%AC%D8%B3%D8%AA%D9%8A%D8%B1 %D8%A8%D8%B9%D9%86%D9%88%D8%A7%D9%86