The relationship between the quality of Onion seedlings and the yield of Onion Seedling

The main results are as follows: 1. The choice of seedling bed: onion seeds are small, cotyledons are not easy to be unearthed during germination, and seedlings grow slowly, so loam or sandy loam with high topography, convenient drainage and irrigation and fertile soil should be selected, and it is better that onion and garlic vegetables have not been planted in 2-3 years.

onion

2. Soil preparation and fertilization: dig up the land and flatten the soil moisture surface, so that the soil moisture surface is fine, and the net moisture surface of the seedling bed is 1.2 to 1.5 meters wide, so as to facilitate ploughing management and water conservation. Apply 1 kilogram of fine dry dung per square meter on the leveling surface, and shallow hoe to level the moisture surface.

3. Sowing: sowing from late August to early September, but not before sowing, it is easy to appear tube onions too early, which affects the quality of onions. The sowing rate is calculated according to 150 tons of 200 grams per mu of field seeds, and the area of the seedbed is 15,20 square meters (that is, the ratio of the seedbed to the field is 1: 30: 40). Spread the seeds evenly on the seedbed, and then cover 0.5 centimeters of fine granular soil or leafy soil. the covering soil should be those that have not planted onion and garlic crops.

4. Soil disinfection and insecticidal of seedbed: after sowing and covering soil, carbendazim + phoxim was used to disinfect water and kill underground pests.

5. In order to keep the seedbed moist, mulch such as loose hair or straw should be covered after sowing, and a shade net with a shading rate of 50% should be covered, and the surface layer should be kept moist by proper watering.

6. seedling management: onion emerged about 7-10 days after sowing, gradually removed the cover in the evening after emergence, and used tetrameric acetaldehyde granules to control snails. Keep the soil moist after emergence, early watering, late watering, light watering, frequent watering, and watering after the 3-leaf stage can be watered every 1-2 days. After 15-20 days of emergence, topdressing can be carried out according to the seedling condition.

7. disease control at seedling stage: when the second leaf of onion grew after emergence, carbendazim + dimethazone was applied to control sudden fall, blight and gray mold at an interval of 7 days for 2 times.