关键词: 主成分分析, 主成分分析, 多级生物系统, 集约化池塘, 修复

Abstract:

Zinc (Zn) deficiency is a prevalent problem in production system of cereal crops. To some extent, Zn deficiency affects yield and quality. There are some problems in zinc fertilizer applications, such as the unreasonable rate or/and inappropriate methods. In this paper, the application methods and rates of Zn fertilizer are summarized and discussed to guide the optimum management of Zn fertilizer in production of wheat, rice and maize. The advantages and disadvantages of each application methods are evaluated. In general, the main approaches of Zn fertilizer application include seed treatment, such as seed priming, seed coating and seed dressing, soil application, like broadcast, banding methods and foliar application, or combination of these methods. And each application method has its advantage and disadvantage and applicability.These methods need to be selected according to the crops, soil condition and specific condition at different location.