玉米的生长发育过程中 ,需要从土壤中吸收各种元素 ,其中对氮、磷、钾三元素需量最多 ,称为“三要素”。土壤中所含氮、磷、钾不能满足玉米生长的需要 ,只有通过施肥加以补充。三者缺一不可 ,如果缺乏其中任何一种元素都会影响产量。因此我们需准确判断玉米三要素缺乏的症状表 During the growth and development of corn, various elements need to be absorbed from the soil, of which the three elements of nitrogen, phosphorus and potassium are the most needed, which are called “three elements”. Soil nitrogen, phosphorus, potassium can not meet the needs of corn growth, only through fertilization to be added. The three are indispensable, if the lack of either element will affect the yield. Therefore, we need to accurately determine the symptoms of the three elements of corn deficiency symptoms