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1.绿叶蔬菜地不宜施硝酸铵肥。如小白菜、大白菜、苋菜、芹菜、菠菜、生菜等,生长期短,易吸收硝酸态氮肥。2.绿叶蔬菜采摘前不宜叶面喷施氮肥。由于绿叶蔬菜可食部分的绿叶在喷施尿素、硫酸铵或人尿溶液后,硝酸盐的含量会显著增加,使蔬菜受到严重污染,从而影响到品质。3.蔬菜地施尿素后不宜立即灌水。尿素中所含氮素成份为
1. Green leafy vegetables should not be applied ammonium nitrate fertilizer. Such as Chinese cabbage, Chinese cabbage, amaranth, celery, spinach, lettuce, etc., the growth period is short, easy to absorb nitrate nitrogen fertilizer. 2. Green leafy vegetables should not be applied before spraying nitrogen fertilizer. As the green leaves of edible part of green leafy vegetables sprayed with urea, ammonium sulfate or human urine solution, the nitrate content will be significantly increased, causing serious pollution of vegetables, thus affecting the quality. 3. After applying urea to vegetables should not be immediately irrigated. The nitrogen contained in urea composition