Applying ear-fertilizer ear fertilizer is the most important top dressing in corn growth. It is applied in the big bell stage of corn, and some earlier plants can touch the “small ceilingâ€. The time for applying the panicle fertilizer can also be determined according to the number of days after sowing. Generally, the spring sowing corn in the open field is 60-65 days after planting (late-maturing variety), 58-60 days (middle-maturing variety), and about 50 days (early-maturing variety). Spike fertilizer. Spike fertilizer is mainly available nitrogen fertilizer, and the application rate is 50-60% of total nitrogen. Generally, 10-15 kg of urea is applied per acre. Phosphorus and potassium fertilizers are not applied in the base fertilizer and the seedling fertilizer. At this time, 10 kg of phosphorus and potassium fertilizers can be applied. Spike fertilizer can be applied between the two rows of corn, or it can be applied at the cave, and the soil is covered immediately after application to prevent the fertilizer from volatilizing and losing. Fields with insufficient growth or uneven growth in the early stage should be applied early, and fields with strong growth should be applied late.
Qinggou soil combined with application of panicle fertilizer to clear the soil, clearing the soil of the ditch to the base of the corn, is conducive to improve the lodging resistance of corn, but also conducive to drought and stain resistance. When cultivating soil, it should be noted that it is not advisable to cultivate soil after the loam soil is raining. After the rain, the soil will cause the soil to be closed and the soil air is insufficient. It is necessary to wait until the topsoil is dry before reclaiming the soil. Dry land without irrigation conditions should not be cultivated, otherwise it will affect the growth of corn due to drought, especially in the later stage, which will cause excessive evaporation of soil moisture.
It is easy to eliminate the phenomenon of multiple spikes in the fields with high fertility and low density of excess spikes, especially fresh waxy corn and sweet corn. Except for a few plants with particularly good growth, one plant can leave 2 spikes, generally one strain. Leave an ear to reduce nutrient consumption and increase the rate of corn spikes. However, it should be noted that when the excess spikes of corn are removed, the leaves of the ears cannot be damaged and removed, otherwise they will not be worth the loss. Individual fresh sweet corn varieties must also remove excess tillers to prevent nutrient consumption.
Prevention and control of pests and diseases The end of heart leaf is a suitable period for controlling corn borer. When the rate of flower plant is more than 25%, it should be controlled. It is better to apply the medicine to the bell mouth or granules to the bell mouth. It can also be used BT powder 800-1000. Double liquid spray control. Corn size spot disease can be sprayed with 64% anti-virus WP 1500 times solution or 80% Sangdesheng WP 600-800 times solution at the beginning of the disease. Spray once every 7-10 days, spray 1 -2 times.
The harvest period of harvesting fresh corn at the right time can be controlled 22-25 days after pollination. The harvesting period and the fresh-keeping period of sweet corn are relatively short, and it is required to sell, eat and process on the same day of picking, and the storage time will decrease after a long period of storage. Common hybrid corn that receives dry seeds is generally harvested 40 days after pollination.
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