Corn is easy to yellow at seedling stage, and the reasons are also multi-faceted. In order to avoid the occurrence of yellowing of corn seedlings with different degrees in different areas, this article has carried out analysis from the following aspects on the basis of practice:
One, sowing too deep
Sowing too shallow is not easy to emerge, too deep will appear weak seedlings, yellow seedlings, sowing depth should be controlled at 3 to 5 cm; sowing at the same time, apply a certain amount of seed fertilizer, can promote seedling growth.
Second, the seedlings, Dingmiao is not timely
After emergence of corn, 3 to 4 leaves of corn should be used for thinning and 6 to 7 leaves when Dingmiao, to avoid seedling crowding, competing with each other, competing for water, glory, the formation of weak seedlings, diseased seedlings, yellow seedlings; Mu Liumiao The number should be flexibly controlled according to the variety and the seedlings should be seeded at the density required by the cultivar.
Third, insufficient 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.
Fourth, water seedlings
Seedlings of water-logged seedlings often coincide with the rainy season. Poor drainage in low-lying plots or accumulation of water at the time of wheat harvesting results in yellow seedlings.
V. Diseases
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. Note that at the beginning of the disease, the base of the corn was sprayed with FMF and foliar fertilizer.
VI. Insect pests
Maize seedling pests include cotton bollworms, golden needles, aphids, armyworms, thrips, rodents of Sweden, ground tigers, and ploughing, etc. The cultivars of nymphs and nymphs concentrate on corn seedlings near the base of the stems. In the roots and leaf sheaths, it absorbs juice, causing the damaged corn sheath to yellow and dry. Timely use 40% phoxim EC 500 to 1000 times, or other systemic insecticide 500 to 1000 times spray on the stem base of corn seedlings or irrigation roots; (can also be rotated or dumped, because cultivating sunflower meal It only harms the gramineous plants.) Other insect pests can be made using generally effective and low-toxic insecticides.
Seventh, herbicide harm
Inappropriate herbicides used by a small number of farmers to increase the herbicide dosage; blindly mixed with other pesticides; excessive drug concentration; sprayer interoperability; counterfeit and inferior herbicides on the impact of post-production, will cause corn yellow seedlings.
Eight, lack of disease
Maize is a sensitive zinc crop, zinc deficiency will appear white seedlings, seemingly corn yellow seedlings. General zinc fertilizer is based on basic application; if zinc deficiency is found during the growth period, it can be used with 1~2 kg of zinc sulfate mixed fine soil 10~15 kg/mu at the seedling stage, or applied with a 0.1% zinc sulfate solution ( Note: Concentration should not exceed 0.4% to avoid causing fertilizer damage. Spraying twice at 7 days intervals between seedling and jointing stage, 60 kg of fertilizer used.
Through the above analysis of the cause of yellowing corn seedlings, to master how to control, so as to increase corn production and improve economic efficiency.
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