What are the summer corn seedling-stage management methods?
How should corn planted in summer be managed during the seedling stage? Here are the reference methods for summer corn seedling-stage management: 1. Check seedlings and fill gaps; if missing seedlings or broken rows occur, check and replant promptly to ensure a full stand. Replant with pre-germinated early-maturing varieties, or transplant seedlings with soil in the afternoon or on cloudy days before the seedlings reach the 4-5 leaf stage. ...
How should corn planted in summer be managed during the seedling stage? Please introduce
The reference methods for summer corn seedling-stage management are as follows:
1. Check seedlings and fill gaps so that missing seedlings and broken rows do not occur. Check and replant promptly to ensure a full stand. Replant with pre-germinated early-maturing varieties, or transplant seedlings with soil in the afternoon or on cloudy days before the seedlings reach the 4-5 leaf stage. Thin corn at the 3-4 leaf stage and set the final stand at the 5-6 leaf stage, removing weak seedlings, small seedlings, diseased seedlings and round-stalk seedlings, and keeping healthy seedlings of uniform size.
Second, carry out timely intertillage so that weed infestation does not occur. During the seedling stage, intertillage and weeding should be done 2-3 times. Before final thinning, intertillage should be shallow, with a depth of 5 cm being appropriate. Before jointing, intertillage to kill weeds 1-2 times to encourage secondary roots to grow deep, with a depth of 10 cm, deeper between rows and shallower near the seedlings. Chemical weed control is encouraged.
Third, check for diseases and control insects so that disease and insect damage does not occur. Promptly clear weeds from field edges, bed ridges and field corners to eliminate aphids and planthoppers. Corn thrips damage the corn whorl in mid-to-late June, causing the whorl to twist, and the damaged leaves show silvery-white stripes; in severe cases the whorl turns yellow and dies, so timely control is necessary.
Fourth, apply extra fertilizer to weak seedlings so that strong seedlings do not suppress weak ones. For weak seedlings, measures should be taken early, with individual plant management to promote weak seedlings into strong ones, so they quickly catch up to the general plant height, preventing severe crowding later that causes empty stalks or small ears with bare tips and missing kernels. The commonly used method is to apply extra fertilizer, applying 5-10 kg of quick-acting nitrogen fertilizer per 667 sq m, placed in holes near the plants, and loosening the soil promptly after application.
Fifth, combine drainage and irrigation so that drought and waterlogging do not occur. A notable feature of the corn seedling stage is tolerance to drought and fear of waterlogging. As long as there is no severe drought, watering is generally not needed, but when waterlogging occurs, drainage should be timely. During the corn seedling stage there is more heavy rain and sudden rain, so drainage should be timely after rain to prevent hot rain from damaging stems, leaves and roots and causing seedling death, especially in low-lying fields and plots with poor land preparation; drainage should be even more timely, and timely intertillage should be done to disperse soil moisture and ventilate, preventing waterlogging.
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