育苗是作物栽培管理过程中的重要措施之一,也是能否获得高产稳产的关键。育苗过程中往往会遇到诸多的环境胁迫:水分过多会烂种、沤根;高温干旱又造成根系发育不良;施肥浓度过高会“烧根”;氮肥过多易引起徒长;湿度大了易感染病虫害;低温寡照下, Nursery stocking is one of the important measures in the process of crop cultivation and management and also the key to whether high yield and stable yield can be obtained. Seedlings often encounter many environmental stresses: excessive water will rotten roots, root; high temperature and drought caused by poor root development; fertilization is too high will “burn root”; excessive nitrogen can cause leggy; humidity Large susceptible to pests and diseases; under low temperature,