What matters needing attention should be paid to the postponement of vegetable seedlings in autumn?

How to postpone vegetable seedlings in autumn how to return to seedlings quickly, fewer dead trees, strong growth, more fruit and many other problems, shanty households are very concerned about. So what are the precautions for postponing vegetable seedlings in autumn?

First, determine the time of raising seedlings.

The mid-late maturity varieties of broccoli listed before and after the Spring Festival should be selected, and the seedling raising time should be from the end of August to the first ten days of September; the seedlings of red-skinned lettuce listed before and after the Spring Festival should be cultivated in the middle of September; the breeding time of precocious red cabbage moss should be in the middle of August, and the breeding time of middle and late maturing red cabbage moss should be from late August to early September.

Second, prepare the seedbed

The seedling bed with hole plate substrate should choose the place with high topography, convenient drainage and irrigation and water source, and the box surface of the seedling bed is flat to ensure that the hole plate is placed stably without losing gas, while the conventional seedling raising should choose the field with high topography, convenient drainage and irrigation and high content of organic matter. the width of the seedling bed is 1.2 meters, and the width of the ditch is 30 × 20 centimeters. It is necessary to prepare cooling facilities for raising seedlings, such as sunshade net, bamboo bow and so on.

3. Seed treatment

Soak the seeds in sun and warm soup. Drying seeds: put the seeds on bamboo vessels or newspapers for about 2 hours at noon to kill some harmful microorganisms on the surface of the seeds and break the seed dormancy. Soak the seeds in warm soup: soak the seeds in warm water of 55 ℃ for 15 minutes. Keep stirring the seeds when soaking. The soaked seeds should be scrubbed off the surface of the seeds with clean water repeatedly. It can also soak seeds with boric acid, manganese sulfate and zinc sulfate (200 mg / L) for 5-6 hours, which has a good effect on early maturity and yield increase of vegetables.

Fourth, sprouting and sowing

After accelerating the seed, the bud is about 0.5 cm long, that is, the so-called "dew white" can be sown. The thickness of the covered soil is very important. if the covered soil is too thick, it is not easy to emerge; if the covered soil is too shallow, it is easy to "wear a cap" (cotyledons are caught by the seed shell). Generally, the depth of sowing and covering soil is about 2 times the thickness of the seed. In addition, the water content of nutritious soil is controlled at 80% after sowing. The depth of soil cover of ungerminated seeds is about 3 times of the thickness of seeds.

Fifth, cultivate strong seedlings

According to the seedling situation, weather and bed soil humidity, replenish water in sunny evening or cloudy day, it should be watered thoroughly at one time. If topdressing is needed, the seedlings can be sprayed with 0.3% potassium dihydrogen phosphate plus 0.2% urea aqueous solution. Insufficient light (too long shading time), too high temperature, too high humidity, partial application of nitrogen fertilizer and too much sowing density are easy to cause overgrowth of seedlings. It is necessary to increase ventilation and light time, increase the application of phosphorus and potassium fertilizer, divide seedlings and plant in time. At the same time, 50% dwarf and strong seedlings can be sprayed with 2000 to 2500 times.

Good prevention of diseases and insect pests

The main diseases in seedling stage are sudden blight and blight in the early stage, early blight, gray mold, Fusarium wilt in the later stage, etc., which can be controlled by two kinds of pesticides, such as benzoin, carbendazim, carbendazim, promethazine, agricultural streptomycin and so on. Aphids can be used to control aphids, Leisben can be used to control aphids, and mites can be controlled by propargite and Uranus.

7. Transplanting of strong seedlings

The age of raising seedlings in autumn is relatively short, and it is necessary to refine seedlings in time for true leaves to grow. Sunny days need to be covered with mulch, in case of cloudy and rainy weather can lift a small arch cover; according to the time from short to long, vents from small to large steps, gradually refining seedlings, until no shade. Always pay attention to the weather forecast 1-2 days before planting, usually in sunny evening and cloudy days, and transplant with medicine, fertilizer and soil.