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蔬菜一般养分需求量较大田作物高5～10倍,因而有些菜农错误地认为蔬菜施肥越多越好,不仅造成了大量浪费,而且对蔬菜的生长造成直接或间接的影响。近年来肥害现象在各蔬菜基地呈上升现象,育苗和生产中都有发生。另外,随着人们生活水平的提高,人们对蔬菜的需求量越来越大,同时由于施肥对人体造成的伤害也日趋严重,下面介绍一下这两种肥害的类型和简单的预防措施。1.肥料的直接伤害主要是指某一种肥料或肥料总量施用过多引起的对蔬菜的伤害,主要原因有(1)单一肥料施用过多保护地蔬菜由于单一施用铵态氮过多,会因为铵分解成氨气,在通风不良的情况下,浓度达到5×10~(-6)就会使叶菜类的茎叶出现明显
The general nutrient demand of vegetables is 5 to 10 times higher than that of field crops. Therefore, some vegetable farmers mistakenly think that the more vegetables they use, the more they will not only cause a lot of waste but also have a direct or indirect impact on the growth of vegetables. In recent years, the phenomenon of fat loss in the vegetable base was on the rise, nursery and production have occurred. In addition, with the improvement of people’s living standards, people’s demand for vegetables is getting larger and larger, meanwhile, the harm caused by fertilizers is also getting worse. Here are two types of fatal injuries and simple precautionary measures. 1. The direct injury of fertilizer mainly refers to the damage of vegetables caused by the excessive application of a certain kind of fertilizer or fertilizer. The main reasons are as follows: (1) excessive application of single fertilizer to protected vegetables Due to excessive application of single ammonium nitrogen, Ammonium will be decomposed into ammonia, in poor ventilation, the concentration of 5 × 10 -6 will make leafy leaves obvious