苹果花期冻害和补救措施１９９３年４月，山东省鄄城县气温一直偏低，最低降至一０．４℃，果树发生了霜冻。分析原因，根本问题是树体营养水平。如凤凰乡前周寺果园营养水平高，花期比其它园片早４—５天，冻害极轻；吉山乡杨老家果园营养水平低，冻害最重。针对这种情况... Apple florescence frost damage and remedial measures In April 1993, Juancheng County, Shandong Province, the temperature has been low, the minimum dropped to a 0.4 ℃, fruit trees frost. Analysis of the reasons, the fundamental problem is the level of tree nutrition. Such as the Phoenix Township Temple orchard before the week of high nutritional level, flowering 4-5 days earlier than other discs, frost damage; Jiyang Rural Yang Orchard low nutritional level, the most frost damage. In view of this situation...