What is the corn bell stage? Most of the trifoliate leaves of the corn stick are stretched out but not fully developed, the heart leaves are clustered, and the sides are like high pitches. This period is the big bell mouth of corn.
This period is usually after sowing. Forty-five The emergence of corn is a key stage of field management. At this time, the purpose of management is to promote stem growth and vigorous panicle production. In order to ensure high and stable yield of maize, the following points should be grasped in management.
The bell stage is the period when corn needs the most fertilizer and the maximum fertilizer requirement during the whole life. Therefore, the top dressing must be strengthened to prevent the phenomenon of de fertilization. It should be generally fertilized according to soil fertility and seedling condition, urea per mu. 15-20 Kg, top dressing should be deep into the earth. 10cm, After fertilization, cover the soil and do not spread the surface to increase the utilization rate of the fertilizer.
Maize has a strong demand for nutrients and water at large trumpet stage. Cultivation can loosen soil, improve ventilation and water and fertilizer supply, thickening plant basal soil layer, promoting root growth and preventing plant lodging. At the same time, weed removal can save water and soil moisture. Therefore, cultivation is an important measure for maize management.
Corn bell mouth is at high temperature season, which is the critical period of water requirement for maize. Watering after fertilization can change the microclimate in the field, facilitate the flowering and pollination of maize, and increase the rate of fruit setting. Twenty-five Soil is not dry during the day.
Four. Pest control
This period is mainly for controlling corn borer, cotton bollworm, red spider and aphid. The pests and diseases should be investigated in the field at any time. Corn borer 50% Phoxim EC 90% Crystal enemy 48% chlorpyrifos Five hundred Ml plus water, mix. Twenty-five Kilograms of fine sand or fine dry soil are used to produce toxic soil to irrigate the heart, and the control effect is better. Red spider 1% Emulsifiable concentrate Forty-five Ml water Fifty Control of cotton bollworm and chrysanthemum ester insecticides according to insect pests. Four hundred Double spike drops were used to prevent and control the spike.