The period from the emergence of maize to the jointing stage is called the seedling stage of corn, and the spring corn is 40-45 days. The main growth characteristics of corn during this period were the slow growth of the aboveground part and the rapid growth of the root system. The central task of field management at this stage is to promote root growth and cultivate strong seedlings to lay the foundation for high yields. Management during this period mainly includes the following points:
1, check the seedlings, make up the seedlings
After the sowing of corn, check the seedlings and make up the seedlings in time. Reseeding seeds should be soaked and germinated first to promote early emergence. If the replanting corn cannot keep up with the seedlings that were sown and grown, the method of transplanting seedlings can be used. Transplanting time should be in the afternoon or cloudy day, preferably transplanting with soil in order to facilitate the return of seedlings and improve the survival rate.
2, seedlings, Dingmiao
The work of seedlings and seedlings is usually carried out in the 3-4 leaf stage. 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 at the seedling stage, the roots of the plants will be staggered and there will be disputes. Water fights the phenomenon of fertilizer. The time of thinning and setting seedlings should be in the sunny afternoon. Those seedlings, insect biting seedlings, and stunted seedlings are more likely to wilt in the afternoon, which is easy to identify and eliminate. For those seedlings with dense leaves, dense leaves, dark and green leaves, and black and green leaves, they should be completely removed.
3, weeding and weeding
Maize cultivars can usually be 1-2 times. Before the seedlings are dwarfed, the first cultivator can be carried out, and the cultivator should avoid squashing. The cultivating depth should be 3-5 cm, and the seedlings should be shallow, and the rows should be deep. Although the intertwining will cut off some of the fine roots, it will promote new roots and control the prosperous part of the ground.
4, seedlings strong
Seedlings should start from the seedling stage and end before jointing. The seedlings should master the principle of “black not black, yellow fat, no fat, not dryâ€. Interplanting corn seeding growth conditions are poor, generally not suitable for seedlings. Should do a good job of water and fertilizer management, promote weak and strong.
5, top dressing
Fertilizer at the seedling stage has the functions of promoting roots, strengthening seedlings, promoting leaves, and strengthening the stems. Generally, after 4-5 leaf stage seedlings are sown, 10-15 kg of urea and 5-7 kg of potassium chloride are applied per mu.
6, pest control
There are many types of corn pests at seedling stage. At present, the main pests that threaten corn in the seedling stage are ground tigers, aphids, thrips, cotton bollworms, lamp moths, wheat flys, and so on. The insect pests should be promptly monitored and reported, and pests should be promptly controlled.
7, water management
Corn is not tolerant to seedlings during the entire seedling period and requires relatively little water, and the upper layer should be kept loose and dry. If it is rainy, it is necessary to pay attention to timely drainage to prevent the accumulation of water in the field.
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