At present, wheat has entered the green period and wheat production has entered a critical period of spring management. This period is an important period for promoting weak seedlings and turning strong seedlings and controlling Wangwang seedlings to grow steadily. During the autumn last year, the main wheat producing areas in the Huang-Huai-Hai area were postponed due to sowing. The population structure of the pre-winter wheat seedlings was reasonable, accounting for 41.3% of the total area of ​​the first type of seedlings, 41.3% of the total area of ​​the second type of seedlings, and accounting for the total area of ​​the three types of seedlings. 17.4%, Wang Miao area is very small, laid the foundation for this year's wheat production group. In addition, the wheat fields in the northern Huang-Huai-Hai region are affected by the rainfall of the wheat sowing season, and the sowing date is delayed by 10-15 days compared with previous years. At present, the seedlings are weak, there are few tillers, the root development is poor, and the population is too small. In view of the above analysis, the steering group of the Wheat Experts of the Ministry of Agriculture studied and put forward the technical advice on dealing with the management of wheat in Huanghuai Haimai District in spring for reference by farmers. Management of frozen wheat fields in winter If freezing damage occurs, the frozen stems are seen to be the main stem and the big shoots, while the middle and small tillers are still green, and at the base of the big shoots, there are budding buds of small tillers that have just emerged. , small tillers and axillary buds can become spikes. Therefore, do not easily destroy the frozen wheat fields and other crops. The remedial measures are as follows: Nitrogen topdressing is applied in time to promote the rapid growth of small tillers. After thawing in the field, immediate application of nitrogen fertilizer is applied. Urea is applied with 8 to 10 kilograms of urea per mu, and the application of ditching is required to increase fertilizer efficiency. In a slightly frozen wheat field, only the leaves are frozen and dead, and there is no dead phenomenon. In the early spring, the area should be plucked, the ground temperature raised, the wheat seedlings should be turned green, the top dressing should be topped with water, and the tillering rate should be increased. Strengthen the management of fertilizer and water in the middle and later stages to prevent premature aging. Moderately chilled wheat fields consume more nutrients in the plant body and are prone to premature senescence in the later period. On the basis of the first topdressing in the spring, suitable topdressing at the jointing stage or flag-raising stage promotes large panicles and grain size, and increases grain weight. The irrigated land is managed separately Three types of wheat management. Three types of wheat fields generally have less than 450,000 total stems per acre. Most of them belong to late-seeding weak seedlings. Spring top-dressing should be performed in two stages. The first time in the middle period of returning green crops, 50% of the total amount of topdressing N fertilizers in the spring and the appropriate amount should be applied. The diammonium phosphate was simultaneously watered to promote spring tillering; the remaining 50% nitrogen fertilizer was applied at the later stage of jointing to increase the grain number per panicle. The management of the second type of wheat. The second type of wheat field generally has a total stem number of 450,000 to 600,000 per mu, and generally uses 10 to 15 kg of urea in conjunction with watering. The general level of soil fertility, the number of acres of wheat stems from 450,000 to 500,000 in the second category, in the early stage of wheat crop up watering; level of higher soil fertility, the number of acres of 500,000 to 600,000 in the second type of wheat, in the midst of wheat crop up watering . One type of wheat field management. In a type of wheat field, the total number of stems per mu is generally 600,000 to 800,000. In the management measures, the combination of control and promotion should be adopted to increase the tillering percentage of tillers. 1. Spray Zhuang Fengan and other chemical control agents to control the growth of plants. 2. High levels of soil fertility, suitable for sowing, the number of acres of 650,000 to 800,000 a wheat field, should take nitrogen fertilizer, after the middle of the jointing, top dressing watering, acres of topdressing urea 12 to 15 kg. 3. The general level of soil fertility is 600,000 to 650,000 acres of wheat. It is necessary to carry out fertilizer and water management in the early stage of jointing wheat, and combine 12 to 15 kg of urea with water in Mu. Wang Miao wheat field management. This kind of wheat field generally has more than 800,000 acre stems in the year before, and the plants are relatively high. In early spring, it is prone to frost damage. The spring fertilizer and water management should be controlled and combined. 1. Spraying regulators during the period of starting to prevent lodging in later stages. 2. In the Wangmiao wheat field without de-fertilization, the seedlings should be repressed early in the spring to avoid excessive spring tillering. During the jointing stage, fertilize the water and apply 10-15 kg of urea per acre. 3. For wheat fields with de-fertilization, if the population is not large, the total number of stems per acre in early spring is below 800,000. In the initial stage, the top-dressing fertilizers are watered; if the groups are large, they can top-dressing and watering in the middle stage. Generally, 10 to 15 kg of urea is applied per mu to prevent Wang Miao from turning weak seedlings.
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