植物的必需营养元素应具备以下三个特征：①影响植物的生长和发育Z②植物缺乏这些元素时表现出特异症状；③直接参与植物的营养过程。所以，要使植物正常生长且丰产必需供应足量的各种必需营养元素。咖啡作为多年生植物，植株的成熟生长包括两个方面：植物本身的生长及为来年萌 Essential nutrients of plants should have the following three characteristics: ① affect the growth and development of plants Z ② plant in the absence of these elements show specific symptoms; ③ directly involved in vegetative processes. So, to make plants grow normally and produce high yields, you must supply a sufficient amount of essential nutrients. Coffee as a perennial plant, mature growth includes two aspects: the growth of the plant itself and the next adorable