How to grow onion seedlings? Key technical points explained in one article
You must use the water-drop seedling method. Before sowing, treat the soil for pests and diseases. After emergence, immediately use Previcur to prevent damping-off and downy mildew, and do a good job of removing weeds. In the Guanzhong area of Shaanxi, sow at White Dew (September 7); in other areas, delay or advance according to the local climate. Seedling method: water-drop seedling raising....
You must use the water-drop seedling method. Before sowing, treat the soil for pests and diseases. After emergence, immediately use Previcur to prevent damping-off and downy mildew, and do a good job of removing weeds. In the Guanzhong area of Shaanxi, sow at White Dew (September 7); in other areas, delay or advance according to the local climate. Seedling method: water-drop seedling raising. Make flat beds 1.4 m wide in the seedbed plot, with length depending on the terrain. Apply 500 kg of high-quality farmyard manure and 2 kg of diammonium phosphate per fen as base fertilizer. Then deep plow and harrow finely, water thoroughly, and after the water has infiltrated, evenly scatter about 0.4 kg of onion seeds with a germination rate higher than 75%. After sowing, cover with soil and cover with a shade net or other covering. After emergence, spray Previcur plus chlorpyrifos to prevent and control downy mildew, damping-off, and onion thrips. Strictly avoid thin sowing and early sowing to prevent vernalization bolting and yield reduction. In the spring-sowing areas of Gansu, **, and northern Shaanxi, when using greenhouses, raise seedlings at the proper time, sow slightly thinly, grow strong seedlings, and achieve high yield.