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近年来，山东省果树保护地栽培发展迅速，保护地栽培品种和技术日臻完善，栽培面积不断扩大，取得了显著的社会、经济效益。为增加保护地栽培果树的花色品种，提高果农经济效益，山东省果树研究所于１９９６年开始在冠县等地选用红美丽李等优良新品种，进行李树塑料薄膜日光温
In recent years, Shandong Province has witnessed rapid development of cultivation of fruit trees and protected cultivars and technologies, and has continuously expanded its cultivation area and achieved remarkable social and economic benefits. In order to increase the protective cultivars fruit color varieties and improve the economic benefits of fruit growers, fruit trees Institute of Shandong Province in 1996 began in Guan County and other places selection of red and beautiful Li and other fine new varieties, the plastic film Lee tree temperature