众所周知,在锌、铁、锰含量低的沙土和沙壤土上,在大量有机物质分解缓慢的碳酸盐土壤和某些其他类型土壤上,以及个别新开垦的贫瘠土壤和由于多年使用失去肥力的土壤上。果树常常感到缺乏上述三种微量元素。根据许多作者的看法,果树簇叶病的发生,是由于土壤中缺锌(W.N.Chandler 等),或者同时缺少几种元素(锌、铁、铜等),或者由于这些 It is well-known that in soils of sandy soil and sandy loam with low zinc, iron and manganese contents, in a large number of carbonate soils where organic matter decomposes slowly and in some other types of soils, as well as with individual newly developed barren soils and soils that have lost their fertility through years of use on. Fruit trees often feel the lack of these three trace elements. According to many authors, foliage leaf foliage occurs due to zinc deficiency in the soil (W.N. Chandler et al.) Or the simultaneous absence of several elements (zinc, iron, copper, etc.) or due to these