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1984年5月17日市农场管理局组织本系统西瓜协作组18人赴山东淄博市临淄区考察了西瓜双覆盖早熟丰产技术,考察情况如下:一、基本情况:山东淄博市距天津450公里,包括博山、淄川、临淄、周村、张店等五个区,全市面积2194平方公里,人口170万人。临淄区主要农作物有小麦、玉米、蔬菜、西瓜。无霜期180天,三月下旬解冻。土壤为黄色壤土,含有机质1％,全氮0.06～0.08％,水解氮
On May 17, 1984, the Municipal Farm Management Bureau organized 18 members of this system watermelon cooperative group to visit the Linzi District of Zibo City, Shandong Province to examine the double-ripening techniques of watermelon double covering. The investigation is as follows: I. Basic Information: Zibo, Shandong, 450 km away from Tianjin, Including Boshan, Zichuan, Linzi, Zhoucun, Zhangdian five districts, the city covers an area of 2194 square kilometers, population 1.7 million. Linzi main crops are wheat, corn, vegetables, watermelon. Frost-free period of 180 days, thaw in late March. Soil is yellow loam, containing 1% of organic matter, total nitrogen 0.06 ~ 0.08%, hydrolysis of nitrogen