In the process of corn growth and development, there are four periods that have the greatest impact on the yield of corn, and once it is not well managed, it is difficult for corn to obtain high yields. The first period is the small flare stage of corn. What are the characteristics of corn at the small flare stage, and how to manage it to obtain high yields?
What is the small flare stage of corn?
Summer sowing corn, generally 38~40 days after sowing, corn grows to 10 visible leaves, 7 unfolded leaves, and the upper leaves are rolled into a small trumpet shape, this period is called the corn small trumpet stage. After the corn enters the small flare stage, the growth of rhizomes and leaves begins to accelerate, and the demand for water and fertilizer begins to increase.
What are the characteristics of corn flare stage?
Corn trumpet stage is the fastest growth period of corn roots, stems and leaves, and it is also the stage when reproductive growth begins, or the high incidence period of beet armyworm, corn borer and other pests, the demand for nutrients begins to increase, the ears begin to differentiate, do a good job in the management of this period, is to improve the ability of corn to resist lodging, drought and heat resistance, the most critical period, once poor management, corn is difficult to obtain high yield. Therefore, it is known as the first critical period of corn.
And how to manage it?
First, top dressing: corn flare stage is the fastest growth period of corn stems and leaves, this period needs to absorb a large amount of nutrients, especially the demand for nitrogen fertilizer, for the bottom fertilizer is insufficient plots, need to carry out top dressing, generally about 10 kg of urea per mu. It can meet the needs of corn growth and development.
Second, the prevention and control of pests and diseases: the corn trumpet stage is the peak period of spodoptera exigua, corn borer and other pests. While doing a good job in water and fertilizer management, we should also pay attention to pest control. Generally, 10 ml of 11.6% emamectin chlorantranyl suspension agent, 20 ml of 10% lice carica, 20 ml of 5% cyhalothrin suspension agent, and 15 kg of water are evenly sprayed per mu.
Third, control the growth of the corn: corn small trumpet stage, reproductive growth and vegetative growth at the same time, in order to promote root growth, improve the lodging resistance of the plant, increase the thickness of the stem, to spray corn control agent, generally with 30% amine fresh ester water per mu 30 ml, mixed with 15 kg of water evenly sprayed.
Fourth, disease prevention and control: corn flare stage, or corn brown spot, corn curvularia leaf spot and other diseases of the high incidence period, in order to prevent the spread of the disease, can be combined with spraying control agents, 30% azole ether tebuconazole 30 ml per mu is required. It can effectively prevent the occurrence of pests and diseases.