The spring wind is big and easy to run, and it is necessary to grasp the appropriate planting depth of corn according to the lyrics. If the temperature is too low, soil compaction, etc., it is not easy to emerge. If the drought is too shallow and the moisture is poor, the seeds will not be able to absorb water. Generally, the depth of sowing is 3 to 5 cm, the sandy soil can be slightly deep, and the clay soil can be slightly shallow.
The quality of the seeding should be checked. The main contents of the inspection are whether the seeding depth is consistent, and whether the seeding depth is on the dry soil layer. The third is whether there is a broken strip. If these problems exist, it is necessary to communicate with the tractor hand in time to find the cause and correct it in time.
After sowing, it is necessary to suppress it in time, not only preventing the soil from being too sham, causing serious running, but also preventing the occurrence of slings and weak seedlings.
If there is a lack of seedlings after emergence, it is not advisable to use seedlings. It is best to use seedlings. When moving the seedlings, pay attention to the clods as large as possible. After the transplanting is successful, remove the leaves from the ground to prevent excessive evaporation of water.
Pay attention to the distance between the species and the fertilizer. At present, most of the corn is planted with mechanical sowing. The fertilizer applied at the time of sowing is spread in a very narrow ditch. Although the applied fertilizer has a distance from the corn seed, the concentration of the fertilizer applied is very concentrated. If you don't pay attention, you will see the phenomenon of burning. Therefore, when planting spring corn, try to adjust the spacing between seeds and fertilizers to avoid hypertrophy.
Pay attention to the choice of planter. The quality of the planter directly affects the quality of the sowing of corn. Generally speaking, the new planter has high technical content and good seeding quality.
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Veterinary drugs: refers to substances (including medicated feed additives) used to prevent, treat, diagnose animal diseases or purposefully regulate animal physiological functions.
Veterinary drugs mainly include: serum products, vaccines, diagnostic products, micro-ecological products, Chinese herbal medicines, proprietary Chinese medicines, chemicals, antibiotics, biochemical drugs, radioactive drugs and topical pesticides, disinfectants, etc. veterinary drug
Also known as veterinary drugs or animal drugs, in a narrow sense, it refers to drugs for livestock and poultry, and in a broad sense, it refers to drugs that prevent and treat all animal diseases except humans and promote their growth and reproduction. The research and development of veterinary drugs and human drugs promote each other and develop synchronously.
China's "Handbook of Veterinary Drugs" (1977 edition) contains APIs and a total of 1,300 varieties, the US "Veterinary Drug Index" contains 460 types of veterinary APIs, the "British Veterinary Pharmacopoeia" contains 210 types of APIs, and more than 130 kinds of preparations and 40 kinds of biochemical immune products. In 1979, Japan produced, sold and imported about 1,900 varieties of veterinary drugs.
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