How to raise seedlings of sweet corn?

How to raise seedlings of sweet corn? Please introduce that the seeds of wrinkled and underfed sweet corn are small, withered and full, the nutrients stored inside the seeds are less for use in the seedling stage, and it is more difficult to germinate and emerge than ordinary corn seeds. If there is no seed treatment, the emergence rate is low, the emergence rate is slow, the seedlings are fine, the seedlings are weak and the seedlings are not strong during the seed germination stage and 1-3 leaf stage, resulting in strong differentiation between large and small seedlings. Sweet corn seeds are expensive, if sowing by direct seeding, it will increase the amount of seeds used per mu and increase the input of production cost. In order to improve the planting benefit of sweet corn, the seedling transplanting method was adopted, and the effect was very good. According to the ratio of soil to fertilizer = 2:1, mix the nutrient soil well, put it into a nutrition bowl or bag, and fill it with 7-8%. 6.2 seed treatment in the week before sowing, choose sunny and warm weather, dry the sweet corn seeds for 1-2 days, then separate them according to the big, medium and small levels, sow separately when sowing, and strive to produce the same seedlings. After grading and drying the seeds, in order to make the seedlings come out neatly and quickly, the seeds can be soaked in warm soup. There are two specific methods: one is to soak the seeds with 0.2-0.4% potassium dihydrogen phosphate solution for 4-5 hours; the other is to soak the seeds with 0.02-0.05% zinc sulfate for 4-5 hours. After soaking, the seeds were waterlogged and washed twice, then soaked in clean water for 4-5 hours, waterlogged, drained, placed at a temperature of 25-30 ℃ and began to germinate. Sow when 70-80% of the seeds are white. 6.3 pour the nutrition bowl with water once before sowing. Sow one seed per bowl and press 667 per bowl. O prepare 4500 nutrition bowls for sowing. After sowing, cover soil 0.5-1? M covers the seeds, then the nutrition bowl is covered with a plastic film. So, every 667? O seed consumption 0.6-0.8? K . About 3 days after sowing, the seedling has just topped the soil, so the mulch must be removed in time to prevent it from growing and causing thin and weak seedlings. 6.4 after seedling management, squatting seedlings properly. When the seedlings had one leaf or two leaves, the solution of potassium dihydrogen phosphate with 500 times solution was sprayed once. 7 days before transplanting, it is necessary to put out the wind and refine the seedlings to make the seedlings strong so as to facilitate the survival of transplanting. One day or the same day before transplanting, water should be watered once to prevent seedling dehydration so as to facilitate survival and promote early development. 6.5 transplanting time the best time for transplanting sweet corn seedlings is from the beginning of sowing to 15-20 days, when sweet corn has 2 leaves or 3 leaves. At this time, the inherent nutrition of sweet corn seeds has not been used up, which has little effect on seedling retardation. If the seedling is too small or too large, it will affect the seedling development. According to this, the periods of early spring, spring sowing, summer sowing and autumn sowing sweet corn can be calculated according to the local climate and the length of frost-free period. Click to get more corn planting techniques click to get more food crop planting techniques