How to manage corn at the seedling stage when it encounters summer high temperatures?
How to manage corn at the seedling stage when planted in summer high temperatures? Please give an introduction. The corn seedling stage is the foundational period for ensuring a high yield. The management goals at this stage are: promote root development, grow more roots, drive roots deep, and cultivate strong seedlings, so as to meet the requirements of sufficient seedlings, uniform seedlings, and strong seedlings. The focus of management is to strengthen water and fertilizer management and disease...
How to manage corn at the seedling stage when planted in summer high temperatures? Please give an introduction
The corn seedling stage is the foundational period for ensuring a high yield. The management goals at this stage are: promote root development, grow more roots, drive roots deep, and cultivate strong seedlings, so as to meet the requirements of sufficient seedlings, uniform seedlings, and strong seedlings. The focus of management is to strengthen water and fertilizer management and the control of diseases, insects, and weeds, as follows for reference:
1. Check seedlings and fill gaps: both reseeding and transplanting must be completed before the 3-leaf stage, and after filling gaps, water and fertilize promptly.
2. Thin seedlings and set the stand: when corn grows to the 3-leaf stage, it must be thinned in timely stages. When thinning, remove the dense and keep the sparse, remove the small and keep the large, remove the weak and keep the strong, remove the diseased and keep the healthy; generally set the stand at the 4-5 leaf stage.
3. Topdressing and cultivating: after setting the stand, carry out topdressing and cultivation according to the growth of the seedlings; generally apply 15 kg of urea per mu as a seedling-promoting fertilizer, and combine it with cultivating to loosen the soil and weed.
4. Control insect pests: pests are severely harmful at the seedling stage. The corn seedling stage is the period when pests such as thrips, Swedish fly, armyworm, and cotton bollworm cause concentrated damage. This year, the two-spotted prodenia litura also broke out on a large scale, causing missing seedlings and broken rows, curled heart leaves, and stunted development; in severe fields it even caused the crop to be destroyed. Therefore, doing a good job of pest control at the corn seedling stage is key. Per mu, use 30 ml of 2.5% beta-cypermethrin plus 30 ml of 50% dimethoate, or per mu use 20-30 g of 10% imidacloprid plus 30 ml of 2.5% beta-cypermethrin, diluted with 30-45 kg of water, and spray the whole field.
5. Prevent waterlogging: corn is most afraid of waterlogging at the seedling stage. If there is excessive rain, drain promptly to prevent waterlogging damage, so as to keep seedlings strong.
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