1. Check seedlings
After the emergence of sweet corn, it is necessary to check the seedlings in time. If the seedlings are found, they should be replanted in time. In the 3-leaf stage, strong seedlings are selected for transplanting and seedlings. Transplanting should be carried out on a rainy or sunny afternoon, and watering should be done in time after planting to shorten the slowing time and ensure survival.
2. Miao Ding Miao
The seedlings should be early, and should be selected before the seedlings are to be rooted, usually in 3 to 4 leaves of the seedlings. If the seedlings are too late, the plants are overcrowded, shading each other, and competing for water and nutrients will cause the primary roots to grow poorly, thus affecting the growth of the aboveground parts. The principle of seedlings is to weaken the seedlings and stay strong seedlings; to remove the seedlings, to keep the seedlings and the seedlings of the same color; to go to the diseased seedlings and stay in the seedlings, generally 2 seedlings per hole are generally carried out in the 4~5 leaf stage, that is, each One hole can be left in the hole, and the seedlings and weak seedlings can be removed. The seedling time should also be sooner rather than later. Where the underground pests occur in serious places and plots, the number of seedlings should be increased, and the seedling time should be delayed appropriately, but it should not exceed 6 leaves at the latest. When fixing the seedlings, be sure to take care of the roots and avoid growing the second seedlings. When planting seedlings, you should do "four to four stays", that is, go to weak seedlings, stay strong seedlings, go to large and small seedlings, stay in seedlings, go to diseased seedlings, keep healthy seedlings, go to mixed seedlings, and keep pure seedlings.
Note: The seedlings and seedlings should be carried out on sunny days.
3. Interplanting weeding
In the seedling stage, the cultivating can loosen the soil and promote root growth. Secondly, it can eliminate weeds, reduce nutrient and water consumption, and promote seedling growth. In the general seedling stage, 2 times of cultivating can be carried out. The first cultivating is carried out before the seedlings are planted, and the shallowing is carried out in the 3-leaf stage. The depth is 3 to 4 cm. At this time, the seedlings are short and the seedlings and the seedlings should be avoided. The second time before the jointing, combined with the soil for cultivating, the depth of cultivating is 6-8 cm. In the cultivating and weeding, it should be noted that the seedlings should be shallowly ploughed next to the seedlings to avoid injury, and the line can be slightly deeper.
4. Corn seedlings
It is necessary to flexibly control the variety, density and soil fertility. Generally, the leaves of dark green, ground fertilizer, high density, and suffocating seedlings are seedlings; the seedlings are not thin, thin, and dry. Therefore, there are farms that have "three nos and three". That is, the black is not yellow, the fat is not thin, and the dampness is not dry. The seedlings should generally end before the jointing. The time is too short to be effective. Too long will affect the differentiation of young ears and form a "small old seedling". When the seedlings are over, they should be topdressed and watered immediately to promote growth.
5. Seedling stage topdressing
Seedling stage topdressing has the functions of promoting roots, strong seedlings, promoting leaves and strengthening stalks. Generally, after the seedlings are fixed in the 4-5 leaf stage, the top dressing is combined with the small-cultivation soil for topdressing, and 4 to 6 kg of urea and 5 to 7 kg of potassium chloride are applied per acre.
6. Water management
Sweet corn requires less water during seedling stage, but from the time of sowing to the time of emergence, it is necessary to keep the soil moist and promote germination. In this period, in case of drought, dry seeding and germination often occur, resulting in serious lack of seedlings. Watering. After emergence, before the jointing, the water needs to be relatively small, keeping the upper layer of soil loose and dry, and the lower layer of soil is wet. Sweet corn is not resistant to cockroaches throughout the seedling period. If it is rainy and rainy, especially in the autumn sweet corn seedlings, it is necessary to pay attention to timely drainage to prevent the accumulation of water in the field to induce pests and diseases.
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