What should I do if there is strong light and high temperature weather after planting or transplanting vegetables?

After sowing vegetables, strong light and high temperature weather will not affect the normal germination of seeds, but will lose a lot of water, especially in the case of insufficient soil water, which will reduce the soil water, the seeds will not germinate normally without absorbing enough water, and the germinated seeds will wither or even burn because of insufficient water, greatly reducing the emergence rate.

If the temperature rises suddenly after sowing and the light intensity is too high, the following measures must be taken: 1. Cover the straw curtain and other plastic films in time to reduce the evaporation intensity of soil and keep the moisture at a reasonable level. When about 50% of the seeds are unearthed, gradually uncover the plastic film, use the sunshade net to shade the sun, and clean up the ground debris, so as not to affect the normal excavation and growth of seedlings.

2. Replenish water in time. Generally, spraying water on the grass curtain can reduce soil hardening, increase soil moisture and reduce soil temperature through water infiltration. Spray clear water with frequent watering and a small amount of water to avoid excessive water and humidity in the nursery. Overirrigation will cause soil hardening and affect seed germination and emergence.

3. Prevent pests and diseases. Covering seedlings with grass curtains can keep the soil moisture in the nursery relatively constant, but it can also cause a lot of diseases and insect pests, such as sudden lodging, sudden lodging, including crickets, yellow striped flea beetles, white grubs and so on. In addition to soil chemical treatment and seed dressing before sowing, we can also untie the grass curtain, spray pesticides and fungicides on the soil surface, and then cover it with grass curtain, which has a quite good effect.

If the temperature rises suddenly after transplanting and the light intensity is too high, the following measures can be taken: 1. Covered with leafy branches or sunshade nets in time, and covered with double-layer sunshade nets when necessary. After 2-3 days, cover with a single-layer sunshade net from 10 in the morning to 4: 00 in the afternoon, and light the rest of the time to avoid overgrowth of seedlings and fading of leaves, which will affect rooting and produce new leaves. If it is raining or cloudy, remove the mulch. If it suddenly clears up after the rain, it needs to be covered and shaded in time to avoid seedling wilting and disease. When the seedlings grow new roots, the mulch can be removed.

2. Use water scientifically. Advocate sprinkler irrigation and drip irrigation, and prohibit flood irrigation and ground watering in high temperature stage. When the seedling wilts, spray it at noon 10- 13 and every 1-2 hours.

3. The newly transplanted seedlings in the shed are too hot and not ventilated, mainly shaded.