This product is used in collecting high-quality DNA/RNA samples from saliva and can be used in various biological experiments such as enzymatic hydrolysis, PCR, and next-generation sequencing. It is widely used for the collection and preservation of specimens in hospitals, scientific research institutions, and families. The collection process is easy and painless, and will not cause any damage or discomfort to the human body.
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After a long period of dry weather, the northern wheat area ushered in two medium or small snow conditions, which have an effect on the greening of wheat. Some wheat seedlings have weak and small tillers, and as the snow melts and the weather cools, it continues to be cold. Under the conditions, wheat seedlings may suffer from freezing damage. Recently, experts have investigated the wheat field in Beijing area and found that there is a small part of the dead seedling phenomenon. Some of the seedlings are stems of the upper part of the stem, not the whole plant freezes to death. With the increase of soil temperature, the root system will gradually move after the snow melts, and the wheat seedlings may also return to green. In order to alleviate the freezing damage of winter wheat, the management of wheat fields must first clear the ditch and guard against waterlogging. Do a good job of clearing the ditch in the frozen wheat fields in time to maintain the roots, enhance vitality, and promote the growth of green and new tillers.
In view of the special situation of the previous climate drought, the key to the management of wheat field in this spring, the key to achieving high yield under water and fertilizer restriction conditions is to make full use of the beneficial regulation effect of water deficit at the seedling stage on plants, and to exert the compensation effect of comprehensive technology to compensate the water and fertilizer in the early stage. Limit the adverse effects on production. First, give full play to the reservoir function of 2 meters of soil, improve the utilization of soil water, and reduce the dependence on rainwater and irrigation water. For example, in view of the current situation of soil moisture deficit in the early stage of wheat in the dry winter weather, the protection of the soil, the lifting of the soil, the timely smashing, rolling, and squatting, and maintaining the surface of the soil cover without cracks. Second, make full use of the moderate regulation of water deficit on the growth of wheat plants and roots, play its compensatory effect, compensate for the adverse effects of pre-flood on the yield formation, not only to expand the primary root group, promote the root system, increase the wheat The utilization efficiency of the lower soil water and fertilizer resources compensates for the adverse effects of the upper soil water deficit, and the photosynthetic functions of non-leaf organs such as ear, stem and sheath are also exerted, and the number of spikes, the number of stable grains, and the grain weight are increased. The strategy (based on years of research by Professor Wang Pu and others at the Crop College of China Agricultural University) to achieve the ultimate high-yield goal.
After the general snowfall in the wheat field water management, the first step of water management in the northern wheat field should be to ensure the conservation and early adoption of corresponding farming measures to prevent the wheat field from running. Although some weak wheat seedlings have not been frozen to death before the year, it may be cold and dry after the year, causing cold and drought and dead seedlings. Therefore, the current focus should pay attention to the protection of wheat fields, and the preservation and storage of "green water" in 2 meters of deep soil is the key to ensuring the increase of wheat harvest this summer. For wheat fields with significantly less snowfall and no frozen water, in addition to timely loosening of the soil, it is necessary to timely watering. In low-lying wheat fields, tillage and withdrawal techniques should be adopted, which is beneficial to soil aeration and elevation of ground temperature, and promotes root development and rejuvenation of wheat.
Nutrient management and fertilization in wheat fields from the regreening to the flowering stage, the wheat has long sorghum, roots, stems and leaves, and the differentiation of spikelets and florets is completed. How to achieve the goal of increasing the ear, strong stalk and ear and large panicle by timely and appropriate fertilization regulation, respectively, should be fertilized according to the type of seedling. The main feature of the "weak seedling" wheat field is that the population is small and the total number of stems is less than 500,000; the average vegetative growth is less than 4 leaves; the leaves are yellowish and the roots are less. For such wheat fields, it is necessary to apply the top dressing early, in order to increase the number of panicles. The fertilization method can use mechanical sowing fertilizer or animal power to ditch and embed fertilizer, and use small water irrigation in sand and dry land to achieve the effect of water feeding. However, it should be noted that if the time of water and fertilizer management in this type of wheat field is too early and too strong, it will not be conducive to the rejuvenation of weak seedlings. Fertilizers are mainly available nitrogen fertilizers, but some wheat fields are not applied with compound fertilizer at the end of the year. At this time, a little phosphate fertilizer should be applied, and potassium fertilizer should be applied to high-yield wheat fields. After the snow, the nitrogen fertilizer should be applied in an appropriate amount, and the pure nitrogen should be about 4 kg/mu (equivalent to 18~20 kg of ammonium sulfate; 8~10 kg of urea). Do not apply excessive nitrogen. Trying to make a one-time supplement will be counterproductive. Only when the wheat seedlings rejuvenate, grow to the second leaf stage, that is, the wheat ear differentiates to the drug interval. At that time, the second nitrogen fertilizer is added to the wheat, which can increase the yield of 1000 grains and increase the yield. Safe, do not fall down. The amount of nitrogen applied is 4~5 kg.
(Senior Consultant of Sinofert Company, Professor of China Agricultural University Cao Yiping)
♦ Contactless sample collection, less risk for healthcare workers.
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♦ Easy to use, non-invasive collection.
♦ Use medical PP material.
The Saliva Collection Kit is a complete kit made out of 100% polypropylene.
The funnel has been engineered to be intuitively easy to use and specifically designed to reduce user self-collection error by preventing flowback.
When saliva is captured in a sterile container, COVID-19 is stable at room temperature for up to seven days without the need for expensive reagents.
The wintering of wheat to flowering is a critical period for wheat growth and requires reasonable water and fertilizer protection. Under the circumstance of the winter drought last year, how to adopt reasonable farming measures according to different seedling conditions and pay close attention to ensuring protection? How to carry out rational fertilization, what fertilizer to apply, how much fertilizer to apply, how to fertilize, the rejuvenation of wheat seedlings, and the increase of wheat yield. This article introduces the specific practices in this area and has certain guiding significance for the management of wheat fields in this spring.
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