Fertilization management technology in spring wheat field

In view of the characteristics of wheat seedlings, the general guiding ideology of spring wheat field management is: scientific management of fertilizer and water, promotion and control, and implementation of classified management. In terms of specific measures, all localities should focus on the following aspects: (1) Timely planning and suppression of slashing not only have good effects of protecting, warming, and eliminating grass, but also promote the growth of weak seedlings and strong growth of strong seedlings. And so on. All kinds of wheat fields should be smashed. Pay attention to the local conditions due to the seedlings. For the evening wheat field, the stroke should be shallow to prevent the roots and the smashed seedlings. Especially for the "Tulipun" wheat field, it is necessary to plan the early morning and early spring to prevent soil compaction and affect the emergence of wheat. For Wangmiao and the long wheat field, deep roots should be cut to control the growth of the aboveground parts. Miao is a strong seedling; for the saline-alkali wheat field, it should be timely in the "topping period" and after the rain to suppress salt return and reduce dead seedlings. Pay attention to the quality, do the fine, smooth, smooth, smooth, do not leave the waste, do not press the wheat seedlings. Strive for 2-3 times before the jointing. Spring cracking can crush the slag, break the knot, seal the cracks, and make the soil surface and soil loosened after freezing and thawing in winter, so that the soil and the roots are in close contact, which is beneficial to the absorption and utilization of nutrient water and reduce water evaporation. Therefore, the wheat field with extensive soil preparation and sloping can be repressed after early spring soil freezing, reducing water evaporation and avoiding cold air intrusion into frostbite wheat seedlings near the tillering section; for dryland wheat fields without hydration conditions, if the soil is loose or knotted It should be suppressed in time to promote the movement of the lower layer of soil, which can improve the soil, protect the sorghum and resist drought. The suppression of the growth of the vines in the wheat field can inhibit the growth of the aboveground parts. When suppressing, pay attention to pressing dry without pressing, not freezing, and not pressing saline and alkali. In addition, the suppression should be combined with the slashing, generally it is first pressed and then smashed, in order to achieve the effect of upper Panasonic, lifting and protecting the temperature. (2) Classification management, scientific fertilization and watering According to the characteristics of wheat growth and development, the management of spring wheat field should focus on the management of fertilizer and water for returning to green, getting up and jointing. In the case of abundant rainfall this year, it is necessary to prepare early and get started early. When pouring water into the green water at the right time, the time for the first watering of the wheat field should be controlled at 5 °C and the temperature is stable at 5 °C. Watering should be done first, the drought is serious, and then the water is poured well; first, the seedlings are poured, and then the weak seedlings are poured; the sand loam is first poured, and the soil with heavy soil is poured, and the wheat field in the saline-alkali field should be poured. Strong seedlings and seedlings in high-yielding wheat fields should be controlled during the regreening period, without fertilizing and watering, to prevent the group from being too large and prolonged. Fertilization should be classified and carried out. For the type of seedlings with sufficient base fertilizer, the control period should be mainly controlled, and 30-40 kg of standard nitrogen fertilizer should be applied to the jointing stage. If the population is too large, spray 15% paclobutrazol (40-50 g/mu) at the end of March and early April to prevent late lodging. For the second-class wheat field with moderate group and individual health, 40 kg of standard nitrogen fertilizer should be applied in the period of getting up. For late wheat fields, spring management should be promoted. Under the conditions of lyrical conditions, it is generally not suitable for watering in early spring. Under the condition of doing a good job, the management of fertilizer and water should be carried out due to seedlings. At the same time of pouring back the green water, the standard nitrogen fertilizer is about 20 kg, and the jointing period is 30 kg. (1) For wheat fields with less seedlings and weaker individuals, especially those with no base fertilizer or insufficient fertilization, nitrogen fertilizer should be applied in the ditch of wheat during the greening period, and the amount of topdressing can account for 20% of the total fertilization amount-- About 30%, before and after the jointing stage, combined with watering and topdressing nitrogen fertilizer, the amount of topdressing can account for 30%--50% of the total fertilization amount. (2) For the late-season wheat field with sufficient seedling volume before winter, if no base fertilizer or insufficient fertilization is applied at the time of sowing, the nitrogen fertilizer should be applied before and after the rejuvenation period; if the fertilization is sufficient and the soil fertility is high, Then you can topdress during the period of up to the jointing stage. (3) For the “Tulipi” or “one needle” wheat field, under the premise of early spring and early shallow shading and ensuring the seedlings and seedlings, watering and fertilization should be combined before and after the body-building period, and the amount of topdressing can account for the total amount of fertilizer. 50% - 60%.

Centrifuge Tubes

Centrifuge tubes are used in laboratory centrifuges, machines that spin samples in order to separate solids out of liquid chemical solutions. The centrifuge tubes can be made of glass or plastic, and resemble miniature test tubes with tapered tips. They are mainly used in series test like the centrifuge of nucleic acid

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