硝酸铵的施用 绿叶菜不宜施硝酸铵。如小白菜、大白菜、苋菜、芹菜、菠菜等,生长期短,易吸收硝酸态氮肥。如施用硝酸铵肥,绿叶蔬菜吸收的都是硝酸盐类离子,这种盐类进入人体后,尤其是长期食用,会引起累积中毒。 纯氮肥的喷施 绿叶蔬菜不宜叶面喷施尿素或硫酸铵等氮素化肥,也不宜喷人尿液。如尿素、硫酸铵或人尿液喷在叶面上,虽能使菜嫩叶肥,色泽美好,增产显著。但硝酸盐在绿叶菜上的含量亦会显著增加,使菜受到污染而影响人体健康。 施尿素后不能马上灌水 尿 Ammonium nitrate green leafy vegetables should not be applied ammonium nitrate. Such as Chinese cabbage, Chinese cabbage, amaranth, celery, spinach, etc., short growth period, easy to absorb nitrate nitrogen fertilizer. Such as the use of ammonium nitrate fertilizer, green leafy vegetables are absorbed nitrate ions, this salt into the human body, especially long-term consumption, can cause cumulative poisoning. Spraying pure nitrogen green leafy vegetables should not be sprayed with foliar urea such as urea or ammonium nitrogen fertilizer, it is not appropriate to spray the urine. Such as urea, ammonium sulfate or human urine spray on the foliage, although it can make vegetables tender, beautiful color, yield significant. However, the content of nitrate in green leafy vegetables will also be significantly increased, so that contaminated food will affect human health. Urine can not be immediately after urinary urea