This year, wheat has good soil moisture due to the autumn crops, sowing time is appropriate, the sowing area is large, the seeding progress is fast, the quality is good, the seedlings are neat, the growth is good, the groups are reasonable, the individual is robust, the various types of wheat grow well and the pre-winter seedlings The best in recent years. However, there are also the following unfavorable factors: First, due to the high temperature accumulated before the winter, the light is less, resulting in some sowing early, or broadcast large amount of land appears prosperous phenomenon, there are hidden dangers of early spring freeze injury and late lodging; It is due to good soil moisture before winter, high humidity in the field, and high temperatures, resulting in more weeds in wheat fields and higher wintering bases for wheat diseases and insect pests; Third, due to excessive humidity during the sowing of some plots and unsatisfactory suppression of straw returning to fields, etc. Individual plots lack seedlings and ridges. For this year's winter before the characteristics of the seedlings, the focus of spring wheat management, to highlight the reasons for the situation due to seedlings, do a good job classification guidance, control prosperous and strong, anti-freeze fall, scientific and rational transportation and fertilizer work. First, do a good job repressing and cutting down, to keep the underground maggots, warming to promote early-onset early spring wheat field suppression is an important agro-control measures to control the development of strong, water saving. Therefore, it is necessary to suppress the growing wheat fields several times in order to suppress the growth of the aboveground areas and control the growth of strong growth and lodging. For wheat fields that are extensively planted in the autumn and cultivated in many places, the wheat fields should be promptly repressed in the early spring after the soil is thawed, in order to sink the soil, bridge the cracks, reduce water evaporation, and prevent cold air from invading the frozen wheat seedlings near the tillering festival. Scratching is an effective measure to promote warming and early warning. Although the amount of precipitation in autumn and winter last year was large, the current situation of wheat field is generally better, but after the spring, with the increase of temperature, soil evaporation increases, and there are uncertain factors in spring precipitation. Therefore, in order to prevent spring drought, in the early spring when the surface layer of soil freezing 2 centimeters (top of the Ling period) on all kinds of wheat cropping, in order to maintain soil moisture, increase surface temperature, eliminate overwintering weeds, for the late wheat field management to gain the initiative. When demarcating, it is necessary to do detailed delineation, delineation, demarcation, and draw-through, leaving no residue, no pressure on wheat seedlings, and no weeds, so as to improve the effectiveness of delimiting. Second, do a good job of various types of wheat field management (A) Wang Miao Wang Miao Mian Mai wheatfield stems in the year before the number of more than 800,000. Due to the large population and slender leaves, these wheat fields are likely to cause field closure, poor light, and lodging after the jointing period. Therefore, the spring management should adopt measures based on control and control. 1. Early buckwheat. For excessively prosperous wheat with dry leaves, after the soil is thawed in early spring, we must use the medlar to carry out the dry leaves in order to ensure the normal growth of wheat. 2. Timely suppression. The repression of wheat during the period of rejuvenation and its resumption of life is a good measure to control the growth of the disease. When the repression begins, it must begin after 10 a.m. on a frost-free day. Note that frosty wheat fields are not repressed so as to avoid damaging the wheat seedlings. Saline wheat fields are not repressed to prevent soil compaction and affect soil aeration. The jointed wheat fields are not repressed so as not to break the internodes, resulting in insufficient panicles. 3. Spray chemical control agent. For excessively prosperous wheat fields, the spraying of “Zhuangfengan†and “Maijujin†chemical control agents at the time of wheat returning to the beginning of growth can inhibit the elongation of the first internodes of the base, control the overgrowth of the plants, and promote root barcing. To prevent late growth during childbirth. Generally 30 ~ 40 ml of mu, 30 kg of water, foliar spray. 4. Determine the time of spring watering by seedlings. (1) For the vegetative growth of the vegetative plants of the year ago, the soil consumption is too large and there is a phenomenon of “defertilizationâ€. If the population is not large, the total number of stems per acre in the early spring is below 800,000, and the seedlings can be seen after returning green. , get up early in the top dressing watering. If the group is too large, you can top-dress and water. Generally, about 15 kilograms of urea is applied per acre to prevent excessive seedlings from turning weak seedlings. (2) For the excessively prosperous wheat field without de-fertilization, do not rush to fertilize the water in the early spring. Pay attention to repression, ploughing, chemical control and other measures to properly control seedlings and avoid excessive spring tillering. In general, fertilizer should be applied at the late jointing stage. The amount of fertilization is 15 kg of urea. (3) For prosperous wheat fields that suffer from freezing injury, 7 kg of urea should be applied per acre combined with watering in the returning green stage of wheat in early spring, and then urea should be combined with watering at the jointing stage. About kilograms. (4) For a prosperous wheat field without water-flowing conditions, the remediation should be carried out immediately after the soil is thawed in the early spring, so as to raise and protect the crop. After the wheat got to the jointing season and rained, grabbed the rain to catch fertilizer. Mu generally recovers about 12 kg of urea. (b) The population of a type of wheat field and a type of wheat field is generally 600,000 to 800,000 per mu, which is mostly strong seedlings. In terms of management measures, attention should be paid to the combination of promotion and control in order to increase the rate of tillering and spike formation and to promote the use of large grains and spikes. In the management of water and fertilizer in such wheat fields, it is necessary to highlight the shift of nitrogen fertilizers. High-level soil fertility, suitable for sowing, a group of 700,000 to 800,000 in a wheat field, top dressing in the middle of the jointing of water in wheat, in order to obtain higher yields. For the general level of the ground, a group of wheat farms with a population of 600,000 to 700,000 will be subject to fertilizer and water management at the beginning of the jointing season of wheat. Generally combined with watering mu urea 15 kg. (C) The second type of wheat in the second type of wheat generally has a population of 450,000 to 600,000 per mu, which is a transitional type between weak seedlings and strong seedlings. The focus of field management in spring is to promote the occurrence of spring tillering and increase the percentage of tillers and spikes. High levels of ground forces, group 550,000 to 600,000 of the second type of wheat, after the wheat has risen, before the jointing, top-dressing and watering; for the general level of the ground, the group of 450,000 to 550,000 of the second type of wheat, in the wheat up period for fertilizer management. Generally combined with watering mu urea 15 kg. (4) The three types of wheat fields in the three types of wheat fields generally have less than 450,000 per acre population and are mostly late-seeding weak seedlings. Spring field management should be based on promotion. Late buckwheat as long as the sensation is acceptable, should try to avoid watering in early spring, so as not to reduce the temperature, affect the soil permeability delay the growth and development of wheat. Generally, it is necessary to top-dress fertilizer in the returning green period so that the fertilizer effect will act before the peak of the tiller, so as to increase the tillering in the spring, consolidate the tillering before winter, and increase the number of mu ears. Fertilizer management should pay attention to: 1. In the group of about 400,000 late-seeding weak seedlings, under the conditions of better lyrical conditions, the top-dressing in the spring should be divided into two: the first time, in the middle period of returning to the middle of Qinghai, when the ground temperature of 5 centimeters is about 5 degrees Celsius, 50% of the dressing fertilizer should be applied. Nitrogen fertilizer and appropriate amount of diammonium phosphate were simultaneously watered to promote the growth of tillers and roots, and the percentage of tillers and spikes was increased. The remaining 50% of nitrogen fertilizer was applied at the later stage of jointing to promote the development of wheat and increase grain number per panicle. 2. For a wheat field with a population of nearly 450,000, it is generally top-dressing and watering. General acres topdressing urea about 15 kg. 3. For weak seedlings and wheat fields without water-flowing conditions, in the early spring, on the basis of repression, cutting and smashing, after the soil is returned to slurry, apply nitrogen fertilizer with chemical fertilizers or ditching to facilitate the increase of mu ear. Number and grain number, increase grain weight and increase yield. The application of phosphate fertilizer to the base fertilizer is to apply diammonium phosphate in the nitrogen fertilizer. At the same time, we must pay close attention to changes in the weather and prevent cold damage in early spring. Early winter frost damage (cold spring) is a common disaster in the early spring. The most effective measure to prevent cold damage in early spring is to pay close attention to weather changes and water before cooling.
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