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50年代在辽南苹果产区,群众曾施用草木炭防治苹果腐烂病。80年代中期,作者通过测定七八月份生长旺期的叶片含钾量,研究与腐烂病发生的关系,没有得到明确结果。后来改变研究
In the 1950s in southern Liaoning apple producing areas, the people have used grass charcoal to control apple rot disease. In the mid-1980s, the author studied the relationship between the potassium content of leaves in July and August growing season and the occurrence of rot disease without any definite result. Later changed the research