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前言作物在生长发育过程中,需要从外界环境吸收必需的营养元素,除需常量肥(N、P、K)和中量肥(Ca、Mg、S)外,还需要一定量的微量元素肥料(下称微肥)。微量元素国外也称微量营养元素或痕迹元素等,作物体内含60—70种元素,但一般作物生长过程所必需的只17种(C、H、O、N、P、K、Ca、Mg、S、B、Mn、Mo、Zn、Cu、Fe、Se、和 Co)左右。作物所需的微量元素主要由土壤供给。但并不能都满足作物的需要,土壤对作物供给不
Preface Crops in the process of growth and development, need to absorb the necessary nutrients from the external environment, in addition to the need for constant fertilizer (N, P, K) and the amount of fertilizer (Ca, Mg, S), but also a certain amount of trace element fertilizer (Hereinafter referred to as fertilizer). Trace elements Foreign also known as micronutrient or trace elements, the body contains 60-70 kinds of elements, but the general process of growing the only 17 kinds of plants (C, H, O, N, P, K, Ca, Mg, S, B, Mn, Mo, Zn, Cu, Fe, Se, and Co). The trace elements required for the crop are mainly supplied from the soil. But not all meet the needs of crops, the soil does not supply crops