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根外施肥是将农作物所需营养成分喷洒于茎叶上的一种施肥方法。它能有效地防止养分在土壤中的固定和转化,具有肥效快、利用率高、施用方便、效果显著等诸多优点,巳被农民普遍接受和应用。进行根外施肥时,要掌握以下主要技术:1.根据肥料的特性,选择肥料种类。用作根外施肥效果较好的肥料有尿素、磷酸二氢钾、硝酸钾、硫酸铵、硫酸钾、偏磷酸铵及大部分微肥等,一些极易挥发的肥料如氨水、碳酸氢铵,以及含有氯离子的肥料如氯化铵、氯化钾等,均不宜作根外施肥。2.根据作物种类及生育期,选择肥液用量及浓度。作物根外施肥的适宜浓度一般是:尿素1～2%、偏磷酸铵2～3%、硼砂0.1～0.2%、硫酸
Fertilization on the outside of the root is a fertilization method that sprays the nutrients required for the crops on the stems and leaves. It can effectively prevent the fixation and transformation of nutrients in the soil and has many advantages, such as quick fertilizer efficiency, high utilization rate, convenient application and remarkable effect, which have been widely accepted and applied by peasants. The root of fertilization, to master the following main technologies: 1. According to the characteristics of fertilizer, fertilizer type. Fertilizers for better root application are urea, potassium dihydrogen phosphate, potassium nitrate, ammonium sulfate, potassium sulfate, ammonium metaphosphate and most of the micronutrients. Some highly volatile fertilizers such as ammonia, ammonium bicarbonate, As well as chloride-containing fertilizers such as ammonium chloride, potassium chloride, etc., are not suitable for root fertilization. 2. According to the type of crop and growth period, the choice of fluid dosage and concentration. Appropriate concentrations of fertilizers suitable for crops are generally 1 to 2% urea, 2 to 3% ammonium metaphosphate, 0.1 to 0.2% borax,