蕃茄正常生长发育,需要吸收各种营养元素,如果某种元素缺乏,便会破坏体内的正常的物质代谢,表现出特殊的病状,即缺素症。蕃茄缺乏大量元素(如氮、磷、钾)时,一般先从下部叶片表现症状,而缺乏锌、铁、硼等时,则先从上部新生组织上表现出来。一、缺氮全株叶片呈黄绿色。老叶初期呈黄绿色,后期呈浅绿色,小 Normal tomato growth and development, the need to absorb a variety of nutrients, if a lack of an element, it will destroy the body’s normal metabolism, showing a special symptom, that is, deficiency. Tomato lack of a large number of elements (such as nitrogen, phosphorus, potassium), the general performance of the symptoms from the lower leaves, but the lack of zinc, iron, boron, the first from the upper part of the new tissue showed. First, the nitrogen-deficient whole plant leaves were yellow-green. Old yellowish green leaves early, late was light green, small