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What is the reason for the yellowing of corn after emergence?
When the hot summer arrived, the seeds had been planted, and some had already emerged. However, the seedlings of corn were most afraid of the low growth of yellow seedlings after corn emergence. The corn science instructors promptly went to the demonstration households for guidance. Corn yellowing mainly has the following reasons: 1, lack of prime disease. Maize is a sensitive zinc crop, zinc deficiency will appear white seedlings, seemingly corn yellow seedlings. The basic zinc fertilizer is generally good; if the zinc deficiency is found during the growth period, there will be small and long-term symptoms of the country. 2, sowing too deep. Seeding is not easy to seedling, too deep will appear weak, yellow seedlings, sowing depth should be controlled at 3-5 cm; sowing at the same time, apply a certain amount of seed fertilizer, can promote seedling growth, such as sowing time per acre Three kilograms of diammonium phosphate can effectively control the yellowing of corn seedlings. 3, between the seedlings, Dingmiao is not timely. After emergence of corn, 3-4 leaves in the corn should be thinning when the seedlings, 6-7 leaves when the Dingmiao, to avoid the overcrowding of young seedlings, competing with each other, compete for water, glory, the formation of weak seedlings, diseased seedlings, yellow seedlings. 4, lack of watering. Insufficient water before or after sowing of the corn, the seed can not get enough water, and then affect the normal germination and emergence, the long time of excavation caused weak seedlings, seedling yellow. 5, disease. If the seedlings encounter long-term low temperature and rainy weather, it will cause the emergence and epidemic of corn seedling blight. Seedling blight occurs at the beginning of the second and third leaf stages. The leaves of the diseased seedlings are dry and yellow, and the edges are scorching. The leaves gradually dry up from the bottom up; the root hairs are less, and the roots are brown and stunted, resulting in weak seedlings of the yellow seedlings. 6, herbicide hazards. Inappropriate use of herbicide by a small number of farmers to increase the herbicide dosage; blindly mixed with other pesticides; excessive drug concentration; sprayer interoperability; counterfeit and inferior herbicide on the impact of post-production, will cause jade yellow seedlings. 7, pests. Maize seedling pests mainly include cotton bollworm, golden needle, aphid, armyworm, thrips, rode fly, ground tiger, and ploughing. The nymphs and female adults are concentrated in the stem base, roots and leaf sheaths of maize seedlings. Absorb sap, so that the damaged corn sheath first yellow and dry.