Vegetable Floating Seedling Technology
The floating seedling of vegetables is a new method of raising seedlings. The method of floating seedling raising is simple, and the management is simple. The seedlings developed are robust, the roots are well-developed, no pests and diseases, and the quality of seedlings is high. It is easy to transplant, and the survival rate of transplanting is high. It is suitable for factoryization. Seedling raising, provincial breeding, labor saving, and rapid growth are both economical and grabbing a festival. The technical points are as follows:
1, seedbed construction
Nursery sites should be selected where the leewards are sunny, free from pollution, convenient water sources, smooth drainage, convenient transportation and easy formation. The seedbed can be made of bricks or earth pits, covering the shed above. With thicker new membranes laid on the bottom of the seedbed and around, it is best to use a black film to prevent the growth of green algae. Nursery seedlings should be covered with shade nets in summer and autumn. After the floating pool is set up, 200 times of bleach solution or 0.1% potassium permanganate solution or quicklime water shall be used to disinfect the surrounding area and floating pool arches; the bottom of the pool shall be covered with black film; after the seedbed is prepared, the water shall be discharged first to test whether the film is Leaking water. If there is no water leakage, start adding clean water to the seedbed. You can use tap water or clean river water with a depth of 10 to 12?.
2, floating disk disinfection
The floating discs used for the first time are free from germs and do not have to be disinfected before use. Used flotation trays may be infected with germs and must be soaked in 0.1% potassium permanganate or 1-100 fold bleach solution before use. The method is to put the floating plate into a tank filled with the above disinfecting solution for more than 10 minutes, remove the concentrated covering film and fumigate for 1-2 days, and then remove the film and dry it.
3, substrate preparation
Substrates can use light-weight substrates such as peat moss, vermiculite, perlite, earthworms, sawdust, and mushroom dregs. Locally sourced or purchased inexpensive light-weight substrates are generally mixed using different matrices. The matrix should have good air permeability to meet the oxygen requirement of the seedling root system. Mixing matrix can be used when the clean film is laid on the ground, and then the matrix is ​​mixed in proportion, and then the mixture is mixed with clean water, the substrate moisture is adjusted to 40-50%, that is, hand-knead into a group, landing naturally dispersed.
4, sowing
Seeding: Floating trays filled with the substrate should be sown on the same day and placed in the floating pool on the same day to prevent water dispersion from affecting emergence. Seed depth of 0.2-0.3?, 1-2 seeds per hole. Cover the seeds with the same moist substrate, then use a wooden board to scrape and make a thickness of about 1?. Place the tray lightly in the flotation tank and sprinkle with a suitable amount of water.
5, after the broadcast management
Winter and spring season nursery, the focus of the early stage is to strengthen the insulation. By March and April, it is necessary to pay attention to open ventilation and hardening of seedlings. When the temperature in the membrane exceeds 28-30°C, the membranes at the two ends of the seedbed are promptly opened for ventilation and cooling, covering the shade net, and the entire membrane can be gradually uncovered when the temperature rises again. Try to make it easier to see the night cover and let the seedlings fully see. The focus of nursery in summer and autumn is to shade and cool down. In sunny days, attention should be paid to preventing high-temperature burning of seedlings. If there is a high-temperature exposure at noon, use shade nets to shade the area and keep it well ventilated. When high-temperature exposure causes the water level of the nursery pool to drop, pay attention to replenish the clean water in time to keep the water level unchanged at 10-12°C. When it rains, take care to cover the top with a film and open both ends. Do not allow rain to splash on the seedling plate to prevent the seedling from falling down due to the impact of rain. It can also prevent the water in the seedling pond from being contaminated by rain and causing the seedling to become sick.
Before hardening seedlings and disease prevention 4-7 days before transplanting, according to the seedling situation, the seedling plate is taken out from the seedling pool, placed on the seedbed side to carry out the hardening seedlings, so that the seedlings will adapt to the open environment. It is possible to increase the explosive power of the seedlings by hardening the seedlings and transplanting them in time when the seedlings are slightly wilted. Before transplanting, seedlings can be sprayed with a lower concentration of carbendazim or chlorothalonil solution to prevent disease. When raising the seedlings, gently pull up and do not damage the roots. Remove the substrates and transplant them to the field.
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