In the summer hot season, the main seedling vegetables are broccoli, Chinese cabbage, late-growing tomatoes, eggplants, sweet peppers, as well as late cabbage, celery, mustard, lettuce and so on.
It is hot and rainy in summer, and there are severe droughts in some years, and the disease is heavy. This is the main obstacle to cultivating strong seedlings. The following measures should be taken to overcome the seedlings to ensure the normal growth of seedlings and the quality of seedlings.
1. Nursery technology to prevent high temperature hazards
High temperature is not conducive to the growth of some vegetable seedlings, such as celery and lettuce germination. In order to prevent high temperature damage, the following measures can be taken: sprinkle some truncated corn stover and wheat straw on the seedbed; cover the seedbed with shade net, and use bamboo curtain and reed curtain Wait for a shade shelter; sow seedlings under tall vegetables, and choose a well-ventilated plot to make a seedbed. Through the above shading method, the temperature can be lowered, the light transmittance is lowered, and the seedlings are unearthed and grown. In addition, in the high temperature season to improve the seed germination rate, such as celery, lettuce seed germination, or low temperature treatment in the well or other cold places, such as celery treatment at 2 ~ 5 ° C ambient conditions for 48h, lettuce in 5 After treatment at ambient temperature for 72 h, it has obvious germination effect and the germination rate can be doubled. The method is that after soaking for 8 hours, it is wrapped with wet gauze and then treated, and the seed is germinated directly after the treatment.
2. Nursery technology to prevent heavy rain damage
On the one hand, the heavy rain in the summer makes the soil compact, which is not conducive to the germination of the seeds. On the other hand, it is easy to cause disasters. The following measures can be taken to prevent it; the high-altitude construction of the seedbed is required; the drainage around the seedbed is smooth, and the rainwater is discharged in time; the temporary cover is used to reduce the rainstorm. Hazard; in case of heavy rain after sowing, the seeds should not be germinated, and should be shallow on the seedbed after the rain to prevent the soil panel knots.
3. Nursery technology to prevent high temperature and drought
In some years or regions, when drought is encountered during summer seedlings, the following measures can be taken to prevent the hazard: seeding in the seedbed after pouring the bottom water, or fully filling the water, then planting the soil and planting the seedlings; after sowing the soil, adopting the method of suppressing the soil surface In the morning or evening, "watering" to the seedbed (water to the end); by seeding, that is, open the hole on-demand, the first hole will not cover the soil after the broadcast, when digging the second hole, the wet soil will be dug out As the first hole covering soil and so on.
4. Nursery technology to prevent viral diseases
Some vegetables and viruses are very serious under high temperature conditions. The following measures can be taken to prevent the above-mentioned measures to reduce the temperature of the seedbed, which is conducive to the prevention of viral diseases; soaked in water for 4 hours, and then put in 10% trisodium phosphate solution after removal. Soak seeds for 20min, then rinse with clean water; choose anti-viral disease varieties for cultivation; use Nile mesh to prevent seedlings; use factory nursery.
5. Prevent seedling growth techniques
In the hot season, some vegetable seedlings are easy to grow, such as tomatoes and cucumbers. The following measures can be taken to prevent the watering amount from being too large. Sprinkle water in the evening or in the morning with a watering can, avoid flooding with large water; expand the nutrient area of ​​the seedlings or timely Seedlings or seedlings; spraying growth inhibitors to control the growth of cucumber tomato seedlings, such as tomato in the 5 leaf, 7 leaf stage with 40% ~ 50% chlormequat 1000 times each spray, can make the seedlings thick, leaf color Green, thickened leaves, promote flower bud differentiation.
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