无土育苗是蔬菜水培成功与否的前提,而适当的育苗块又是进行无土育苗的首要物质条件。莴苣(生菜)等速生叶菜类进行水培时,更迫切需要适用的育苗块;否则育成的苗就无法水培。另外这些蔬菜的生长周期短、单位面积栽培的苗数多,如不解决育苗块问题,也难以进行水培。国外莴苣等蔬菜水培都采用相应的育苗块等容器育苗。例如,日本水培的莴苣一般用聚氨酯泡沫塑料块育苗;美国通常用指形育苗管,内盛纤维棉水培莴苣。此外,也 Soilless nursery stock is the prerequisite for the success of vegetable hydroponics, and appropriate nursery stock block is the main material conditions for soilless nursery. Lettuce (lettuce) isometric leafy vegetables for hydroponics, more urgent need for appropriate nursery blocks; or breeding of the seedlings can not hydroponic. In addition the growth cycle of these vegetables is short, the number of seedlings per unit area of ​​cultivation, if not solve nursery block problem, it is difficult to carry out hydroponics. Foreign lettuce and other vegetable hydroponics are the appropriate nursery blocks and other container nursery. For example, Japanese hydroponic lettuce nursery plastic blocks generally use polyurethane; commonly used in the United States finger nursery tubes, cotton fiber hydroponic lettuce. In addition, too