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西芹“烧心”芹菜“烧心”分两个时期,一个是生长前期,一个是成株期。发病症状:开始时心叶叶脉间变褐,以后叶缘细胞逐渐死亡,呈黑褐色,生长点附近新叶坏死。发病原因:主要是由缺钙引起的。大量施用化肥后易使土壤酸化而缺钙,施肥过多,特别是氮肥、钾肥过多,会影响根系对钙的正常吸收。另外,低温、高温、干旱等不良环境条件均会降低根系活力,减弱根系对钙的吸收能力,加重缺钙。所以要做到平衡施肥、合理灌溉。
Celery “heart” celery “heart” is divided into two periods, one is the pre-growth stage, one is the adult stage. Symptoms: At the beginning of the heart leaf between the brown, after the leaf marginal cells gradually died, dark brown, the growth point near the new leaf necrosis. Cause of the disease: mainly caused by calcium deficiency. After a large amount of fertilizer is applied, the soil is easily acidified, calcium deficiency and excessive fertilization, especially excessive nitrogen and potassium fertilizer, which will affect the root’s normal absorption of calcium. In addition, low temperature, high temperature, drought and other adverse environmental conditions will reduce the root activity, reduce the ability of root absorption of calcium, increasing calcium deficiency. Therefore, to achieve balanced fertilization and reasonable irrigation.