一、温州蜜柑缺氮症 1、症状特征叶片小,细长,无光泽,嫩叶从叶脉间到叶脉部变成黄色,成年叶片全部由淡绿变成黄色。在严重缺氮情况下,果树提早落叶,而且十分严重,新梢也抽得少,所长出的枝条细而短。因此,长期处于缺氮的情况下,当年春天几乎没有上年叶片,而且呈现明显的小枝丛生、生长势弱的树冠。花蕾也小,上年结果较多 First, Wenzhou Mandarin orange deficiency symptoms 1, the symptoms of small, slender, dull, young leaves from the veins to veins into yellow, adult leaves all from light green to yellow. In the case of serious nitrogen deficiency, fruit trees early leaves, and very serious, but also pumping less shoots, grow branches thin and short. Therefore, under long-term nitrogen deficiency, there were almost no leaves of the previous year in the spring of that year, and the tree crown with obvious branchlet growth and weak growth appeared. Buds are small, more results last year