无土栽培是在不具备土壤的条件下,进行作物的栽培的。作物生育所须肥水条件,完全由营液来提供,因此,营养液及其配制管理技术,是无土栽培的重要内容。一、作物的根系营养及其吸收特点作物在生育过程中,需要通过根系吸收多种矿质元素来维持其自身的生命活动,如:构成作物的组织成分;调正作物生长发育;参与酶的活动等。作物需要的矿质营养元素种类很多,其需要量也各不相同。一般根据作物吸收量的多少,将其分为两大类:一类称大量元素,主要有氮、磷、钾、钙、镁、硫等;一类称微量元素,主要有铁、硼、锰、锌、铜等。作物需要的这些元素,虽然需要量差异很大,但都是同等 Soilless cultivation is the cultivation of crops without the soil. Fertility conditions required for crop growth are entirely provided by the marinade, and therefore nutrient solutions and their formulation management techniques are an important part of soilless cultivation. First, the crop’s root nutrition and absorption characteristics Crops in the reproductive process, the need to absorb a variety of mineral elements through the roots to maintain its own life activities, such as: the composition of the crop tissue; adjust the crop growth and development; involved in enzyme activity Wait. There are many types of mineral nutrients needed by crops and their needs vary. Generally according to the amount of crop absorption, will be divided into two categories: a class called a large number of elements, mainly nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, etc .; a class called trace elements, mainly iron, boron, manganese , Zinc, copper and so on. These elements needed for crops, although the requirements vary widely, are equal