The North China and Huanghuai wheat areas include Hebei, Shandong, Henan and northern Jiangsu, northern Anhui, southwestern Shanxi, and Shaanxi Guanzhong Plain. The current characteristics of the seedlings in this region are: the foundation of the autumn species is good, the soil moisture is appropriate, and the current seedling situation is the best year in recent years. However, there are also unfavorable factors such as large area, large number of weeds in wheat fields, large number of wintering pests and diseases, and complex seedlings. In the spring, wheat management should grasp the early management, classify and guide, suppress and control the water, rationally manage the water and fertilizer, and promote the multi-grain weight of the panicle, which lays a good foundation for high yield of wheat.

Repression and slashing, raising and warming, early spring wheat field suppression is an important agronomic measure to improve the control and increase the efficiency. The repression of the overgrown wheat field during the rejuvenation to the beginning of the body can inhibit the growth of the aboveground parts and play a role in controlling the growth. The suppression should be carried out in combination with the slashing. Generally, the sputum should be pressed first to achieve the effect of tying up, lifting, protecting and warming. When the autumn is planted, the wheat field is extensive and sloppy, and it should be timely after the soil is frozen in early spring. Repressing the wheat field to calm the soil, bridging the cracks, reducing water evaporation and avoiding cold air intrusion into the frostbite wheat field near the tillering section; for the dryland wheat field without irrigating conditions, the wheat field repression after early spring soil freezing can promote the upper soil moisture uplift , to protect against drought.
Promote the control and control of the water in the wheat field in North China and Huanghuai wheat area. The water quality of the wheat field, the seedlings and the soil fertility are different. The spring fertilizer management must be guided by the seedlings. Spring management should first manage three types of wheat fields, then two types of wheat fields, and then a type of wheat fields. For Wang Miao, the first thing to do is to suppress the control during the rejuvenation period, and then apply fertilizer and watering according to the size of the group during the up or jointing period.
Focus on control, and do a good job in Wang Changmiao management. Generally, the number of stems per mu of wheat seedlings is more than 800,000, the plants are taller, the leaves are longer, the differentiation process of spikes of main stems and low tillers is advanced, and freezing damage occurs in early spring. After the jointing, it is easy to cause the field to be covered, the light is poor and lodging, and the spring fertilizer management should be dominated. The first is the repression of the rejuvenation period. This is the most effective measure to control the growth of the seedlings and transform them into strong seedlings. This year, the area of ​​the wheat seedlings is large, and we must do a good job of repression. The second is to spray the Zhuangfengan and other regulators during the period to shorten the base joints and prevent the late lodging. The third is to manage the fertilizer and water of Wang Miao according to the size of the group. The seedling wheat field without defermentation should be used to suppress seedlings in early spring, avoid excessive spring tillering, fertilize water in jointing stage, apply urea 10-15 kg per mu; for wheat fields with de-fertilization, if the group is not large, early spring The total number of stems per mu is less than 800,000, and it is topdressed and watered at the beginning of the body; if the group is too large, it will be topdressed and watered in the middle of the body, and the urea will be applied for 10-15 kg per mu to prevent the seedlings from turning weak.
Promote the three types of seedling management. The total number of stems of the three types of wheat fields at the beginning of the green period is less than 450,000, which is mostly late seeding and weak seedlings. The management of spring fertilizer and water should be promoted. In the spring, the topdressing is carried out twice. The first time in the regreening period, when the temperature is 5 cm, the temperature is stable at 5 °C, and the topdressing and watering are started. The urea is applied with 5-7 kg of urea and the appropriate amount of diammonium phosphate to promote spring tillering and consolidate the tiller before winter. Increase the number of ears per mu; the second time in the middle of jointing, fertilize and water, increase the number of grains per ear. In the southern part of the Huanghuai wheat area, there are no irrigated plots in the north and south of Henan and the southern part of Henan, and should be applied to the green fertilizer when the spring falls.
Promote the combination of control and do a good job in the management of the second type of seedlings. The total number of stems of the second type of wheat field is 450,000-600,000. The focus of spring fertilizer management is to consolidate the tillering before winter, appropriately promote the occurrence of spring tillering, and increase the rate of tillering. The level of soil fertility is generally two, the second type of wheat field with a number of stems of 450,000 to 500,000. In the initial stage of wheat, the topdressing and watering are combined with watering, and the urea is 10-15 kg. The level of soil is higher, and the number of stems is 500,000-600,000. In the second type of wheat field, the wheat is topdressed and watered in the middle of the wheat. In the southern part of the Huanghuai wheat area, there are no irrigated plots in the north and south of Henan and the southern part of Henan, and the rain should be applied to the body during the spring precipitation.
Control and promote the combination, do a good job in a type of seedling management. The level of soil fertility in a type of wheat field is relatively high. The total number of stems per acre in the beginning of greening is 600,000-800,000. It belongs to the strong wheat field, which should be controlled to promote the combination, increase the rate of tillering and increase the number of grains. First, the body is sprayed with Zhuangfeng'an and other regulators, shortening the base internodes, controlling the plant growth, promoting the root system and preventing the late growth. The second is to topdress the water in the jointing stage of wheat, and the urea is 12-15 kg. In the southern part of the Huanghuai wheat area, there are no irrigated plots in the northern and southern parts of the south and south of Henan, and the rain should be applied to the rain during spring precipitation.
Prevention and control of pests and diseases, comprehensive prevention and control of spring pests and diseases should be vigorously promoted by staged treatment, mixed application of drugs and treatment of a variety of pests and diseases. Regreening to jointing stage is another peak of infection and other viral diseases such as sheath blight, total rot disease, root rot and other diseases such as bushy dwarf disease and yellow dwarf disease. It is also a hazard of wheat spiders, underground pests and grass pests. At the peak, it is one of the key links in comprehensive wheat control. All local plant protection departments should do a good job in forecasting and forecasting pests and diseases, and guide farmers in timely prevention and control.
Pay attention to the weather to prevent early spring frost damage in early spring (inverted spring cold) is a frequent disaster in early spring in North China and Huanghuai wheat area. The most effective measure to prevent early spring frost damage is to pay close attention to weather changes and water before cooling. Since the heat capacity of water is larger than the heat capacity of air and soil, watering before the early spring cold current can increase the water vapor in the near-surface air, and when condensation occurs, the latent heat is released to reduce the variation of the ground temperature. Therefore, in areas with watering conditions, watering before the cold wave can adjust the microclimate near the ground layer, which has a good effect on preventing early spring frost damage.