1. Squatting seedlings.
The purpose of squatting is to promote the growth of the root system in large quantities by controlling the water supply, so as to lay a good foundation for the above-ground plants to absorb nutrients from a larger area, and the squatting time usually lasts from seedling emergence to jointing. However, squatting seedlings cannot be one-size-fits-all, but "squatting because of seedlings". If the soil structure is good, the moisture temperature is suitable, the seedlings are vigorous and vigorous, and the leaves are thick and green, such plots should be squatted to control the seedlings.
2. Replenish seedlings. The amount of corn seedlings in the field is large, to obtain the ideal yield level, not only the seedlings are needed but also the seedlings are needed, so the seedling observation in the field should be strengthened in the corn seedling stage, and the lack of seedlings should be replanted in time, and the early lack of seedlings can be replanted. In the later stage, it is necessary to replenish the seedlings in time, mainly to sow the seedlings in concentrated or dense areas, with the soil, and then dig holes and transplant in the lack of seedlings, and it is best to water after transplanting if you have the conditions, and the time for transplanting and replenishing seedlings is best before the rain or after four or five o'clock in the afternoon on a sunny day.
3. Seedlings. If the seedling density is too large, the corn stalk will be weak and difficult to produce large ears, and the more troublesome thing is that the slender and tall stalk will greatly reduce the lodging resistance of the corn, thus laying hidden dangers for the later field growth and grain filling. The time of thinning and seedling setting should be early rather than late, usually 3-4 leaf stage is appropriate, if it is postponed to 5-9 leaf stage, it will cause a large reduction in yield, and the yield reduction ratio is between 14-27%. The principle of seedlings is to leave the weak and strong, and to the sick and strong.
4. Watering. After the emergence of corn, drought may occur in some areas, resulting in weak corn seedlings, and even wilting and yellowing, in this case, irrigation and watering should be carried out in time, and the unseeded corn can be promoted to emerge as soon as possible through watering, and it is also conducive to the growth of corn seedlings, increase their own resistance, reduce the harm of pests and diseases at the seedling stage, and also lay the foundation for subsequent growth.
5. Fertilization. Top dressing at seedling stage can promote the growth of roots, seedlings, leaves and stems, and the specific topdressing time should be determined according to the seedling condition and soil fertility. In addition to chemical fertilizers, organic fertilizers can also be applied, corn seedling stage is also a critical period for phosphorus and potassium fertilizers, phosphate fertilizer and potassium fertilizer should be applied at the seedling stage, and the amount of nitrogen fertilizer should be determined according to soil and seedling conditions.
6. Weeding. When the corn 3-5 leaf stage, it is the critical period for corn post-emergence weeding, spraying corn post-emergence herbicide, on the one hand, the weed growth is small, the resistance is relatively weak, the weeding effect is relatively good, on the other hand, the corn at this time, is not so sensitive to herbicides, not easy to cause pesticide damage, common herbicides can also be sprayed in the whole field, such as nicosulfuron + atrazine, mesotrione + atrazine, nicosulfuron + metrisulfone + atrazine, etc., and after 5 leaves, it is necessary to spray herbicides containing safety agents.
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