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我县下屯公社南辛堡一队有12亩小国光苹果园,1964年定植,1974年开始大量结果,伴随结果黄叶病发生愈来愈严重。远望果园一片黄,新梢端部叶片枯焦脱落。对新梢生长、花芽分化、果品产量和质量都有严重影响。 为了解决黄叶问题,从1977年开始喷0.1％硫酸亚铁,每年喷3—4次,连续4年没有取得什么效果。 后对果园土壤进行了化验,结果是该园主要缺磷,有效磷11ppm)。土壤呈碱性(pH值8),缺铁的可能性不大,因此分析该果
A team of Nanxinbao, Xiaantun commune in our county, has 12 mu of Guoguang apple orchard. It was planted in 1964 and started to produce a large number of results in 1974. With the result, the occurrence of yellow leaf disease is more and more serious. Yuanwang orchard a yellow, shoot the end of the leaves off focus Kujiao. On the shoot growth, flower bud differentiation, fruit production and quality have a serious impact. In order to solve the yellow leaf problem, 0.1% ferrous sulfate was sprayed from 1977 and sprayed 3-4 times a year for four consecutive years without any effect. After the orchard soil was tested, the result is the park mainly lack of phosphorus, available phosphorus 11ppm). Soil is alkaline (pH 8), iron deficiency is unlikely, so the analysis of the fruit