How can summer corn be seedlings?

1. Make good preparations before the broadcast

1.1 Selection of excellent varieties such as Zhengdan 958; Agricultural University 108, Yudan 20, Yongyu No. 2, etc.

1.2 Seed treatment, choose sunny days for 2 to 3 days, which is conducive to increase the germination rate, early emergence and reduce silk smut. Soaking seeds can promote the germination of seeds, and the emergence of seedlings is quick and the seedlings are in harmony. The method is characterized by cold water soaking for 12 to 24 hours; immersion in warm water for 6 to 12 hours; soaking with 30% or 50% of the fermentation urine for 6 to 8 hours; 500 times of potassium dihydrogen phosphate solution for 8 to 12 hours. , can achieve the same effect. Soaking seeds should pay attention to the time of full-bodied hard-type seeds, and the time of glutinous and dentate seeds should be short; the seeds soaked should not be sun-dried, not piled up, and should not be packed with plastic bags; When the ground is dry and the sensation is insufficient, it is not suitable for soaking seeds; the soaked seeds should be sown in time. Seeds that are dried after dipping can be mixed with 0.5% copper sulphate or 1% 20% scalloped seed, anti-black powder and silk smut, or phoxim, 1605, seed coating, Coating to prevent underground pests.

2. Seeding at the right time

Summer corn should be planted early, and wheat field should be planted 7 to 10 days before wheat harvest. Live field harvesting and timely sowing (shovel seeding).

3. Improve the quality of seeding

The amount of sowing is generally controlled at 1.5 to 2.5 kg, and the sowing depth is controlled at 3 to 5 cm. The seeding is over thin and evenly tight, and it is timely suppressed after sowing. At the same time as planting, apply a certain amount of fertilizer to make fertilizer. For example, when 15 kg of potassium carbonate is applied per mu, the seed fertilizer can effectively control corn stalk rot (also known as bacterial wilt). The leaves of the diseased plants are dark gray-green, and the early premature aging is dead, and the ears are drooping, often causing lodging. Therefore, the application of a certain amount of fertilizer, not only promote seedling growth, but also prevent disease occurrence.

4. Watering in time

The sowing of corn shovel is also called smashing and sowing. Generally, the soil temperature is small. After sowing, water should be watered in time to replenish the soil moisture to supply sufficient water to ensure the normal germination and emergence of the seeds.

5. Strengthen seedling field management

5.1 Checking seedlings and replenishing seedlings Summer maize should be checked for seedlings and seedlings in time. Replanted seeds should be first soaked and germinated to promote early emergence. If the replanted corn cannot catch up with the seedlings that were originally planted, the method of transplanting seedlings can be used. The transplanting time should be in the afternoon or cloudy days, it is best to transplant the soil with soil to facilitate the return of seedlings and improve the survival rate.

5.2 seedlings, seedlings and seedlings are generally carried out in the 3 to 4 leaf stage, 6 to 7 seedlings. Since the corn is in the “weaning period” before and after the 3-leaf stage, there must be good light conditions. If the plants are overcrowded during the seedling stage, the roots of the plants are staggered, and the seedlings will be fixed at the leaf stage than the 3 to 4 leaf stage. 14% to 27%, so the work of seedlings and seedlings should be carried out as early as possible. When fixing seedlings, it is necessary to go to weak seedlings, self-crossing seedlings, and diseased seedlings, and keep high and short, fine and uniform seedlings with thick stems. Change the seedlings into hand-made seedlings. If there are missing seedlings, you can leave two strains before and after. The time between seedlings and seedlings should be in the sunny afternoon. Those seedlings, insect bites and dysplastic seedlings are more likely to wilted in the afternoon, which is easy to identify and eliminate. For those silky black-spotted seedlings with dense seedlings, thick, fine, curved, black-green leaves, they should be completely removed.

5.3 Seedlings to promote seedlings should start from the seedling stage to the end before the jointing. The seedlings should master the principle of “black, not yellow, fat, not thin, dry and not wet”. Interplanting corn seeding growth conditions are poor, generally not suitable for seedlings. We should do a good job in water and fertilizer management, and promote weakening and strengthening.

5.4 Early-stage cultivating, cultivating, cultivating, slashing, slashing and soiling, to improve the physical and chemical properties of the soil, improve the permeability of the soil, promote the rooting of the corn roots, expand the root absorption range, and create a good reproductive environment for the early development of seedlings and the cultivation of strong seedlings. .

5.5 Early application of seedling fertilized corn Fertilization should change the fertilization method of the past one shot, and fertilize according to the leaf age index. The seedling fertilizer is carried out after 6 to 7 leaves after the seedling (25 days after sowing), and the amount of fertilizer is 30% to 40% of the total fertilization amount. Generally, the acre is applied (about 10 cm deep) with 50 kg of ammonium bicarbonate, 50 kg of superphosphate and 15 kg of potassium chloride.

5.6 Chemical weeding corn After sowing, use 40% A mixture or 50% Du A mixture before planting, 150 ~ 200 ml per mu, 30 ~ 40 kg of water, evenly spray the ground; 4% Yu Nong Le 75 ~ 100 after corn emergence ML shall be treated with stems and leaves for 30 kg of water. It may also be sprayed between rows of corn 30 cm or more. 120 to 150 ml of 20% gram of traceable water per acre, and even spray of corn between 30 and 50 kg of water. Be careful not to spray on the corn. When using herbicides, the amount of water should be appropriately increased, and the high temperature weather should be avoided, so that it is not re-sprayed or leaked.

5.7 Anti-disease and pest control Maize seedlings are susceptible to virus infection, which is the prone period of rough disease. Timely removal of weeds in the field and surrounding areas, elimination of poisonous insects, planthoppers, leafhoppers, mites, etc., can effectively reduce the occurrence of diseases. For the control of Laodelphax striatellus and spider mites, 10% of imidacloprid wettable powder can be sprayed with 20 grams per acre, and 30 kilograms of water can be sprayed to eliminate the poisoning medium. To prevent corn rough disease, use a 1.5% phytotoxic water agent to spray 30 kg of water per acre of 30 kg. In the seedling stage, it is sprayed with systemic insecticide for 1 or 2 times to control insects such as sticky insects and thrips.

Vtm Sampling Tube With Swab

[Sample requirements]
The collected nasopharyngeal swab samples should be transported at 2°C to 8°C and sent for inspection immediately, and the sample delivery and storage time should not exceed 48 hours.

[Testing method]
1. Before sampling, mark the relevant sample information on the label of the sampling tube.
2. According to different sampling requirements, use a sampling swab to sample in the nasopharynx.
3. The specific sampling methods are as follows:
a) Nasal swab: Gently insert the swab head into the nasal palate, stay for a while and then slowly turn to exit. Wipe the other nostril with another swab, immerse the swab head in the sampling solution, and discard the tail.

b) Pharyngeal swab: Wipe bilateral pharyngeal tonsils and posterior pharyngeal wall with a swab, also immerse the swab head in the sampling solution, and discard the tail.

4. Quickly put the swab into the sampling tube.
5. Break the part of the sampling swab higher than the sampling tube, and tighten the tube cover.
6. Freshly collected clinical specimens should be transported to the laboratory within 48 hours at 2°C to 8°C.

[Explanation of test results]
After the sample is collected, the sampling solution turns slightly yellow, which will not affect the nucleic acid test result.

[Limitations of the test method]
1. For samples that are seriously contaminated due to improper storage after collection, the final test results will be affected.
2. If the sample is not stored at the specified temperature, the final test result will be affected.

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