When the heat damages the lettuce and celery sprouting at a high temperature, it is difficult to soak the seeds for 8 hours and wrap them in a well or cold place with a wet gauze. Or low-temperature treatment, celery is 2 ~ 5 °C 48 hours, lettuce is 5 °C 72 hours, can promote germination, increase germination rate. You can also sprinkle some crop straw or straw on the seedbed, or cover the seedbed with cold yarn or shade nets, or you can use a awning to cover old films, non-woven fabrics, bamboo curtains, curtains, etc. Seedlings under a crop.
Severe vegetable virus diseases occur at high temperatures and various measures should be taken: In addition to the above-mentioned nursery facilities, 10% trisodium phosphate solution can also be used to treat mustard and tomato seeds for 10 minutes and then rinse with clean water; or inoculate tomatoes with attenuated vaccines. Choose anti-virus varieties; use nylon net yarn to prevent warts; use silver-gray film to avoid warts; timely treatment of warts and so on.
The rain damages the soil in summer with heavy rain, which is not conducive to seed germination and unearthing. The following measures should be taken: choose a high dry land to build a seedbed; be vulnerable to rainstorm areas should choose sandy loam seedlings; smooth drainage around the seedbed, use temporary cover to reduce the risk of heavy rain; after sowing, in case of heavy rain, the seed is not unearthed, after the rain on the seedbed Shallow cultivator to prevent soil surface compaction.
Seedlings planted in drought-damaged seedbeds, sowed, or fully irrigated and then soil-plotted; planted by sowing; replanted after sowing; mulching (immediately after emergence); watering in the morning or evening; sowing seedlings, sowing seedlings After the first hole is sown, it will not cover soil. When the second hole is dug, the wet soil excavated from the first hole will be used as the cover of the first hole.