The period from emergence to jointing of maize is the seedling stage, summer corn generally experiences 20-25 days, and spring corn is 40-45 days. The main growth characteristics of corn during this period were the slow growth of the aboveground parts and the rapid growth of roots. 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. The main technical measures for seedling management include: seedlings, seedlings, seedlings, seedlings, cultivators, grass seedlings, seedlings, seedlings, fertilizers, and insect pests. 1, check seedlings, fill seedlings and summer corn seeding should be promptly check seedlings, make up the seedlings. 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. The seedlings and seedlings of thinning and fixing seedlings are usually carried out in the 3-4 leaf stage. Since the corn is in the "weaning period" before and after the 3-leaf stage, good lighting conditions are required. If the plants are overcrowded at the seedling stage, the root system Staggered, there will be competition for water and fertilizer. According to experiments conducted by the relevant agricultural research department, the summer maize seedlings in the 5- to 9-leaf stage will be seeded at the 3-4 leaf stage, and the yield per hectare will be reduced by 14% to 27%. Therefore, the seedlings and the fixed seedlings should be carried out as early as possible. 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, seedlings to promote strong seedlings should start from the seedling stage before the end of 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. 4, cultivator weeding maize seedlings can be 2-3 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. Interplanting maize fields are generally hardened at the seedling stage, and they should be cultivated in time after wheat is harvested, and the wheat stubble should be removed and the compaction should be removed. 5. Topdressing According to research, phosphate fertilizer is best applied before the 5 leaves. Therefore, phosphorus, potash and organic fertilizers should be applied as soon as possible before and after seedling cultivation. 6, pest control corn seedlings more species, especially summer corn. At present, the main pests that threaten corn during the seedling stage are ground tigers, aphids, thrips, cotton bollworms, lamp moths, wheat flys, and the like. It is imperative to do a good job of monitoring pests in time and find out that pests are prevented and treated in time.
Heng Li Seafood Co., Ltd. , http://www.zz-food.com