The invention relates to a large-scale 
seedling-culturing method for cultivating 
cassia sophera seedlings without bacterial infection by utilizing 
cassia sophera seeds in a direct seeding mode, which solves the problem that the existing 
seedling-culturing land has no selecting standard, and seedlings are low in 
sprouting percentage, high in infective rate of putridity at the 
seedling stage, dark in 
root system, small in earthnut, weak, high in death rate and low in 
survival rate after being transplanted. New sandy soil with good breathability or rice fields are utilized, a shell breaking 
machine is utilized to carry out partially shell breaking, and seeds are used for cultivating the seedlings in the direct seeding mode by means of prepared matrixes laid on a seed 
bed to reduce rice field. Mulching films are utilized to keep the temperature and the 
humidity of the ground. By spraying prepared 
nutrient solution by stages, needs for 
nutrient of the seedlings are met, environment is clean, the 
plant diseases and the 
insect pests are reduced, the seedlings are robust, root systems are strong and white in color, rhizomes are thick and strong, the infective rate of putridity is low, the 
survival rate after 
transplantation is high, operation is simple and convenient, and the seedling-culturing method is suitable for cultivating the 
cassia sophera seedlings in a large-scale mode. Strong seedlings can be cultivated more than zero point four million per mu, and the 
survival rate after the 
transplantation reaches to above 98%.