The strong seedling management is suitable for the sowing date, individual development is good, and the group's reasonable and strong seedling field is the main measure to ensure the steady development of the seedling condition. First of all, in the early spring suppression, deafness, warming and ventilation to ensure that the wheat seedlings early. The spring suppression can crush the crushed rubbish, break the compaction, seal the cracks, sink the topsoil, make the soil and the root system close, which is conducive to the absorption and utilization of nutrients and water, and reduce the evaporation of water. Paddles can protect, warm, and weed, and therefore have an effect on all types of wheat fields. Followed by top-dressing or jointing watering. The appropriate group of strong seedlings, the first spring water and fertilizer will promote the group too early in the spring, premature aging, the application of nitrogen fertilizer in such wheat fields can effectively control the excessive proliferation of invalid childbirth, increase dry matter accumulation after flowering, prolong the post-fertility period The photosynthetic high value duration of the flag leaves increased root vitality, delayed aging and increased grain weight. For the higher level of soil fertility, a suitable type of seedlings suitable for sowing and suitable for the group should be topdressed and watered during the jointing stage of wheat to obtain higher yields. For the general level of soil fertility, the second type of seedlings with relatively small populations should be subject to fertilizer and water management during the wheat growing season. In combination with irrigation, applying about 5 kg of urea per acre, the wheat spikes were completely differentiated, which laid the foundation for large grains and large grains. Wet seedlings in dry lands will be topdressed in early spring, and topdressing urea will be 3 to 4 kg. Weak seedlings manage weakened seedlings to promote growth, allowing individuals to grow faster. The main focus is on early delineation, warming up, and promoting early-onset seedling growth. At the same time, top-dressing watering. If the sensation is poor and the population is insufficient, it is necessary to top-dress fertilizers during the return period, promote the growth of tillers in spring and increase the number of mu. For the sowing seedlings with increased seeding volume and appropriate groups, only the late seeding weak seedlings with few leaves and poor root development were topdressed and watered during late spring or early growing period according to the level of soil fertility, population size and development trend. If the sensation is good, late buckwheat should avoid watering in early spring, so as to avoid lowering the ground temperature due to watering, affecting the soil permeability and delay the growth of wheat seedlings, and should be in the returning green period of wheat to open up the trench and apply 7-10 kg of nitrogen fertilizer. In order to promote the growth of tillers, properly expand the group, to lay the foundation for the number of acres to ensure adequate; during the jointing stage, fertilizer and water to share, improve the rate of spikes, promote the development of floret, increase the number of grains per ear. In the returning green period and the reinstatement of wheat, the repression should be started when there is no frost after 10:00 am. Be careful that there is no pressure on the frozen wheat fields so as not to damage the wheat seedlings. In particular, it is necessary to suppress the long wheat fields with rotary tillage and straw return. By compacting the soil, warming and protecting the roots, promoting root growth, and controlling seedlings to turn strong seedlings, the “cold spring†and late lodging are prevented. Chemical control is also an effective measure to control Wang Miao, 25 to 30 ml of Zhuangfengan per mu, and 30 kg of water, but also Xiaomiao Zhuang 45 to 60 grams or 5% Uniconazole 35 to 40 grams or 15 % Paclobutrazol 50 ~ 70 grams, watered 50 kg, spraying in sunny, no wind, no exposure, avoid repeated spraying. Ensure that the groups are reasonable, ease the growth potential, individuals grow robustly, and increase resistance to lodging. Prevention of frost damage in early spring may cause frost damage in early spring each year and must be highly valued. After the beginning of spring, the wheat entered the period from turning green to jointing. As the cold wave arrived, the surface temperature dropped below 0°C and frost hazards often occurred. As the climate has gradually warmed up, and suddenly came the cold wave (cold spring), through the early spring repression, spraying Zhuang Fengan and other methods can inhibit growth and development and improve cold resistance. Wheat is a crop with tillering characteristics. Wheat fields that suffer from frost damage in early spring will not freeze all of them, and there are also axillary buds that can be divided into panicles. The remedial measures after wheat is frozen in early spring are immediate application of available nitrogen fertilizer and watering. The coupling effect of nitrogen and moisture will promote early tillering of wheat and small borers, and increase the percentage of tillers and spikes to reduce the loss of frost damage. In the water-free conditions of dryland wheat to do a good job in suppressing the plan, the top Ling Xiao, early spring fertilizer and other major measures. The combination of repression and scratching can crush the soil blocks, seal the cracks, settling the soil, raise the soil moisture, promote the development of the root system, and increase the drought resistance of wheat itself. Top Peak has the same effect. After returning to the soil in the early spring or following a light rain, applying N fertilizer with chemical fertilizer or digging has a prominent effect on increasing the number of ears and grains per ear, increasing grain weight, and increasing yield. Phosphate fertilizer is not applied to the base fertilizer in the dressing with diammonium phosphate. Integrated pest control of weeds and weeds is eliminated through manual weeding and chemical weeding. Although snowfall and low temperature limit the occurrence of pests and diseases, it is also necessary to pay close attention to the dynamics of pests and diseases and to prevent and treat them in time. In addition, we must strengthen the monitoring of strip rust, forecasting and the selection of prevention and treatment of diseased fields, reduce the number of disease sources, and reduce the scale of its epidemic. In addition, all localities must combine current precipitation conditions with the use of fertilization in order to promote transformation of the situation.
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In response to the current situation of wheat in northern China, Zhang Baojun, a member of the Expert Advisory Group of the newspaper and a professor at Northwest A&F University, put forward technical measures for the classification of wheat fields.