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蔬菜是高度集约化栽培的作物,光靠土壤养分和基肥是很难满足其生长发育所需要的氮、磷、钾三要素,而且在不同的生长发育时期,还必须补充一定数量的微量元素。因此,必须及时诊断各种缺素症状,进行综合防治,才能确保蔬菜的优质、高产、高效益。一、缺素症状1.缺氮首先在老叶上呈现淡绿或黄色,随即基秆上也发生同样的变化,并扩大到整个叶簇,最后整个植株变成淡黄或褐色。这一演变,几乎所有
Vegetable is a highly intensive cultivation of crops, soil nutrients alone and basal fertilizer is difficult to meet the needs of its growth and development of the three elements of nitrogen, phosphorus and potassium, but also in different stages of growth and development, but also must add a certain amount of trace elements. Therefore, we must promptly diagnose a variety of deficiency symptoms, comprehensive prevention and control in order to ensure the quality of vegetables, high yield, high efficiency. First, the symptoms of deficiency 1. Nitrogen deficiency first in the old leaves showed light green or yellow, then the same changes occurred on the base stalk, and expanded to the entire leaf clusters, and finally the entire plant becomes yellow or brown. This evolution is almost all