番茄在生长发育过程中,需要吸收多种营养元素,一旦某种元素缺乏,就会通过植株的外部形态表现出相应的缺素症状,生产上多以此作为诊断缺素和采取补救措施的依据。1.缺氮番茄缺氮时,植株生长缓慢,呈纺锤形,初期老叶呈黄绿色,后期全株呈浅绿色,叶片狭小而薄,花序外露,俗称“露花”;叶脉由黄绿色变为深紫色。茎秆变硬,呈深紫色,富含纤维。花芽黄色,易脱落,果实变小,富含木质。补救措施:发现缺氮,及时用尿素、碳铵等 Tomato in the process of growth and development, the need to absorb a variety of nutrients, once a lack of an element, it will be through the external morphology of plants showed the corresponding symptoms of deficiency, production more as a basis for the diagnosis of deficiency and take remedial measures . Nitrogen deficiency of nitrogen-deficient tomato plants grew slowly, spindle-shaped, the initial yellowish green leaves, the latter part of the plant was light green, thin and thin leaves, inflorescence exposed, commonly known as Green becomes dark purple. Stalk hardens, dark purple, rich in fiber. Flower bud yellow, easy to fall off, the fruit becomes smaller, rich in wood. Remedy: Found nitrogen deficiency, timely use of urea, ammonium bicarbonate and so on