Seedling culture trough and soilless seedling culture method for hydroponic vegetables

The invention discloses a seedling culture trough and a soilless seedling culture method for hydroponic vegetables. The seedling culture trough comprises a trough frame, a trough bottom, a fluid-discharge pipe, an isolation net, a filter cloth, and a drip irrigation pipe, wherein the periphery of the bottom of the trough frame is connected with the trough bottom to form the main body of the seedling culture trough; the fluid-discharge pipe runs through the seedling culture trough and extends out of the bottom of the trough bottom; the isolation net is higher than the pipe port of the fluid-discharge pipe; the filter cloth is arranged at the pipe port, located at the seedling culture trough, of the fluid-discharge pipe; the drip irrigation pipe is laid in the extension direction of the seedling culture trough. A nutrient solution adopted is prepared from calcium nitrate tetrahydrate, potassium dihydrogen phosphate, potassium sulfate, magnesium sulfate heptahydrate, potassium nitrate, chelated iron, borax decah