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苗木的外部形态是内在因素和外界条件的综合反映 ,当土壤中有些养分不足或者不平衡时 ,苗木的器官状态和叶片色泽会发生变化 ,表现出一定的缺素症状。因此 ,在苗木管理过程中 ,及时观察 ,分析出现的特征 ,进行营养诊断 ,做到合理施肥 ,是培育壮苗的一项重要技术措施。1 缺氮特
The external shape of the seedling is a comprehensive reflection of the internal factors and external conditions. When some nutrients in the soil are insufficient or unbalanced, the organ status of the seedling and the leaf color will change, showing some deficiency symptoms. Therefore, in the process of nursery stock management, timely observation and analysis of emerging features, diagnosis of nutrition, and reasonable fertilization are important technical measures to cultivate strong seedlings. 1 nitrogen-free special