Return to green wheat fields after winter drought should be classified according to seedlings fertilization

The overwintering of wheat to flowering in winter is the key period for wheat growth and requires reasonable water and fertilizer protection. In the last winter when the climate was arid, how could we adopt reasonable farming practices and pay attention to conservation according to different conditions? How to apply reasonable fertilization, how to apply fertilizer, how to apply fertilizer, how to fertilize, is related to the rejuvenation of wheat seedlings, wheat production, this article describes the specific practices in this regard, has a certain guiding significance for the management of wheat in the spring.

After a long period of dry weather, the northern wheat region ushered in two medium or light snow conditions, which have an impact on the return of green wheat. Some wheat seedlings appear to be weak and have fewer tillers. As the snow melts and the weather cools, the temperature continues to decrease. Under the conditions, wheat seedlings may suffer freezing injury. A recent expert survey of wheat fields in Beijing found that there are a small number of dead seedlings. Some of the seedlings are dead from the shoots on the ground, not the entire plant. As the soil temperature rises, the root system will gradually move after the snow melts, and the wheat seedlings may turn green. In order to reduce the frost damage to winter wheat, the wheat field management must first clear the ground and prevent waterlogging. Timely clean up the trenches in frozen wheat fields to conserve root system, enhance vitality, and promote the growth of turn green and new tillers.

In view of the special conditions of previous climate drought, the principle of wheat management in spring this year, and the key to achieving high yield under the conditions of water and fertilizer restrictions, is to fully utilize the beneficial regulation effect of water deficit on plants during seedling stage, and to use the compensation effect of comprehensive technology to compensate for the early stage water and fertilizer. Limit the negative impact on production. First, the reservoir function of 2 meters of soil is fully utilized to increase the utilization of soil water and reduce the dependence on rainwater and irrigation water. For example, aiming at the current status of winter wheat soil moisture deficit caused by dry winter weather, strengthen the conservation of soil moisture, raise the earthworms, and timely reclaim the land, pressure, and land, and keep the surface soil covered with no cracks. Second, make full use of the beneficial role of moderate water deficits on the growth of wheat plants and roots, and use their compensatory effects to compensate for the adverse effects of drought on yield formation. It is necessary to expand the primary root mass, promote root down-barreling, and increase wheat yields. The utilization efficiency of the underlying soil water and fertilizer resources, and compensation for the adverse effects of the upper layer of soil water deficit, should also utilize the photosynthetic function of non-leaf organs such as spikes, stems, and sheaths, and implement the “increased panicle number, stable grain number, and increased grain weight”. The strategy (according to years of research Professor Wang?W, etc., from the Agricultural College of China Agricultural University) to achieve the ultimate goal of high yield.

Water Management in Wheat Fields After the general snowfall, the first step in water management in northern China's wheat fields is to ensure conservation and early adoption of appropriate farming measures to prevent runaway wheat fields. Although some weak wheat seedlings did not freeze to death in the past year, it is possible that after the year, the cold and wind blows will cause cold and dry crops and death. Therefore, the current focus should be on the protection of wheat fields, and keeping and keeping “green water” within 2 meters of deep soil is the key to guaranteeing the increase of wheat production in the summer harvest this year. For those wheat fields with significantly less snowfall and no frozen water, timely watering should be carried out in addition to timely soil cultivating. In low-crop wheat fields, tillage, removal of earthworms and other farming measures should be used, which is conducive to soil aeration and increase in temperature, to promote the development of root systems and wheat seedlings rejuvenation purposes.

Nutrient management and fertilization in wheat fields From regreening to flowering, wheat has long pods, roots, stems and leaves, as well as differentiation of spikelets and florets, and multiple organs have to be completed. How to achieve the target of increasing ear, strong culm and ear and panicle by timely and appropriate fertilization regulation should be fertilized according to the type of seedling type. The main characteristics of “weak seedlings” in wheat fields are that the population is small and the total number of stems is less than 500,000; the average annual vegetative growth was less than 4 leaves; the leaves had yellow color and less roots. For this type of wheat field, early application of fertilizer should be carried out in order to increase the number of panicles. The method of fertilizer application can be mechanical sowing of fertilizer or animal husbandry, and the use of small water irrigation in the sand and dry land can achieve the effect of water fertigation. However, it should be noted that in such wheat fields, if the time of water and fertilizer management is too early and excessive, it will not be conducive to the rejuvenation of weak seedlings. Fertilizer is mainly available nitrogen fertilizer, but some wheat crops before the end of the year did not apply compound fertilizer, this time with a little application of phosphate fertilizer, but also for high-yield wheat fields with potassium fertilizer. The amount of nitrogen fertilizer applied to wheat after snow should be appropriate, about 4 kg/mu pure nitrogen (equivalent to ammonium sulfate 18 to 20 kg; urea 8 to 10 kg). Don't overdo it with nitrogen. In an attempt to make up for a one-time compensation, it will be counterproductive. Only when the wheat seedlings rejuvenate and grow to the two-leaf stage, that is, the wheat ear is differentiated to the drug isolation period, when the wheat is supplemented with the second nitrogen fertilizer, it can increase the grain yield and regain high yield. Safe, not lodging. The amount of nitrogen applied is 4 to 5 kg.

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