The following six points should be noted when cultivating vegetable seedlings under severe weather conditions such as high temperature and rain in summer:
1. Selected plots
The nursery site should choose a plot with high dryness, convenient irrigation and drainage, fertile soil and good permeability. It is most forbidden to nurse the plots with continuous cropping or stubble planting the same family of vegetables to avoid soil-borne diseases and avoid underground pests. Serious plot breeding occurred. The plot should be fully rotted farm manure as a base fertilizer, according to the specific varieties of vegetables, and then mix the appropriate amount of compound fertilizer and a small amount of micro-fertilizer, and shallow plowing once.
2. Anti-high temperature
For lettuce, celery and other vegetable seeds that are difficult to germinate, the seeds should be treated before sowing. First soak the seeds for 8 hours, wrap them in wet gauze, and put them in a cool place to germinate, or low temperature treatment. Celery is 2℃～5℃ for 48 hours, lettuce is about 5℃ for 72 hours. It can promote germination and increase the germination rate. You can also spread some crushed wheat straw on the bed, or cover the bed with a shade net.
3. Antivirus
Vegetable virus disease is serious under high temperature conditions. Eggplant and tomato seeds can be treated with 10% trisodium phosphate solution for 10 minutes, and then rinsed with clean water. Technical measures such as inoculation of tomatoes with attenuated vaccines, selection of anti-viral varieties, anti-aphid with nylon mesh, anti-aphid with silver-gray membrane, and anti-aphid in a timely manner can also be used to prevent viral diseases.
4. Anti-storm
Seedbeds should be built on high dry plots. Sandy soil should be used for nursery in areas prone to heavy rains. Drainage should be smooth around the beds. Temporary coverings such as old shed membranes should be used to cover the heavy rains. Saline hardening of the border surface affects emergence.
5. Drought prevention
Pour enough water first, and then prepare the ground, sowing the soil, and then suppress it after sowing and covering the soil. For coriander, lettuce, celery and other weakly germinated vegetable seeds, can be covered with weeds, wheat straw, newspapers and other shades on the surface (removed in time after emergence). In case of drought in the bed, in the morning or evening, spray water to the bed with a sprayer to increase the humidity of the border surface, which is conducive to seed germination.
Six, anti-primary
Breeding seedlings in summer can easily cause the seedlings to grow long. Spraying plant growth regulators can be used to control the growth. Timely divide seedlings or seedlings. For cucumbers and tomatoes, spray ethephon to control the seedlings. The tomatoes are sprayed once each in the 5-leaf and 7-leaf stage with 40% to 50% chlormequat 1000 times solution to make the seedlings thick and leafy. Dark green color, thickened leaves, promote flower bud differentiation, and increase yield.
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