The advantage of this sowing method is that it is fast. The disadvantage is that the number of seeds per hole is not uniform, or even there is no seed hole phenomenon.
(2) Sowing with mixed soil: Sowing in batches in several plates. Weigh out the seeds and nutrient soil needed for each batch, first put 1/3 of nutrient soil into each hole evenly, then mix the other 2/3 of nutrient soil and seeds evenly, sprinkle them into the holes of seedling trays, level them with a scraper, pile them up and compact them every 10 ~ 15 of seedling trays, transport them to the seedbed, and place and flatten them.
This sowing method is widely used. The advantages are simplicity, labor saving and high efficiency, while the disadvantages are uneven sowing depth and irregular seedling emergence, so it is necessary to increase the sowing amount appropriately to make up for the deficiency.
(3) Seeding by placing the seedling tray first: This sowing method is to put the seedling tray in the seedbed first, leaving no gaps between the seedling trays. After the press plate is put into the mud, one of the above two methods is used for sowing, and the operation procedure is the same as the above corresponding method.
This method is labor-saving and simple, but the soil is not easy to compact, so it should be compacted on the upper pile after sowing.
(4) Seeding method of seeder: ① Seeding method of drawer seeder. This seeder matches the specifications of the seedling tray. When sowing, select the corresponding seeder according to the number of holes in the seedling tray and the sowing amount per hole. First, fill 2/3 of the nutrient soil into the hole of the seedling tray, then align the hole of the bottom plate of the seeder with the hole of the seedling tray, move the upper plate to cover the hole of the lower plate, put the seeds germinated until the breast is broken into the seeder, scrape off the redundant seeds between the holes of the upper plate, move the upper plate to align the holes of the upper and lower plates, and the seeds fall into the holes of the seedling tray. Every 10 ~ 15 trays are stacked together and transported to the seedbed with tray supports to fix the trays. Pressing plate, covering soil, watering, chemical weeding, house inspection and film mulching are the same as ordinary sowing methods. (2) The sowing method of trough seeder. Uncover the rubber plate so that the notch is upward, pour the nutrient soil into the notch, scrape off the excess part, and rotate the groove rail to make the soil fall into the hole of the seedling tray. Put the rubber plate in place, sow, scrape off the excess seeds, and then turn the groove rail to make the seeds fall into the holes of the seedling tray. Stacking, transporting, swinging, compacting and covering soil are the same as common sowing methods.