Peanut planting rotten seed and seedling solution
1, seed quality problems
In the selection of peanut seeds, the quality is not very high. For example, some friends use self-preserved species at home, some moldy, rotten, dried, etc., are directly taken to sow, and some seeds are directly rotted after sowing seeds. In the soil, it leads to emergence of seedlings. The solution: to buy good breeds, even if it is reserved, but also carefully selected.
2, drying problems
Peanut before sowing, the appropriate drying is OK, but to prohibit the sun exposure, because it may be peanut peeling sun burst crisp, that is, we say the sunburn seeds, leading to bad seedlings do not emerge. Solution: You can choose to dry, you can choose sunny weather, you can continuously dry for two hours a day or so, and not exposure to direct sunlight.
3, seed coating agent
According to theory, after peanut seed dressing, it can play a certain role in preventing bad seeds, but excessive use will inhibit the emergence of peanuts and cause seedling deficiency. Last year, a friend of spring peanut growing area said that his family’s One hundred acres of peanuts, because of the misuse of seed dressings, the dose was originally 15 kilograms of seed dose, the result was seen as 15 pounds, the dose increased by half, resulting in a lot of no emergence. Solution: When using peanut seed dressing, the dose must be asked. You can ask the salesperson, or call the manufacturer's telephone on the packaging, in accordance with the above instructions.
4, sowing temperature
The choice of temperature during sowing is particularly important. It mainly refers to the spring peanut area, because low temperature will affect the emergence of seedlings. Under normal circumstances, peanuts are planted at about 5cm, and when the ground temperature is above 15 degrees (some varieties require higher) The emergence of seedlings is very good. If the temperature is too low to reach the germination temperature of peanuts, it will cause seedling deficiency. Solution: Pay attention to the change of temperature during sowing, cool down or temperature too low, so you can sow for several days.
5, sowing depth
If the peanuts are sown too deeply, the time for peanuts to grow in the soil will be relatively prolonged. In the past, because the seeds were so deep that the peanuts did not sprout, there were many cases. Check out the causes and find out that many peanuts were rotted in the soil. In particular, seed dressing seeds, we must pay attention to the depth of sowing. Solution: The general sowing depth is recommended between 3-5cm. Whether it is manual or machine sowing, pay attention.
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The automatic biochemical analyzer is an instrument that measures a specific chemical composition in body fluids according to the principle of photoelectric colorimetry. Due to its fast measurement speed, high accuracy and small consumption of reagents, it has been widely used in hospitals, epidemic prevention stations and family planning service stations at all levels. The combined use can greatly improve the efficiency and benefits of routine biochemical testing.
principle
The automatic analyzer is to automatically run all or part of the steps of sampling, mixing, warm bath (37°C) detection, result calculation, judgment, display and printing results and cleaning in the original manual operation process. Today, biochemical tests are basically automated analysis, and there are fully automatic biochemical analysis systems designed for large or very large clinical laboratories and commercial laboratories, which can be arbitrarily configured according to the laboratory's testing volume.
Whether it is the fastest-running (9600Test/h) modular fully automatic biochemical analyzer today, or the original manual-operated photoelectric colorimeter for colorimetry, the principle is the use of absorption spectroscopy in spectroscopic technology. It is the most basic core of the biochemical instrument.
Optical system: is a key part of ACA. Older ACA systems used halogen tungsten lamps, lenses, color filters, and photocell assemblies. The optical part of the new ACA system has been greatly improved. ACA's beam splitting system can be divided into front splitting and rear splitting due to different light positions. The advanced optical components use a set of lenses between the light source and the cuvette to convert the original light source. The light projected by the lamp passes through the cuvette to bring the beam to the speed of light (unlike traditional wedge beams), so that the spot beam can pass through even the smallest cuvette. Compared with traditional methods, it can save reagent consumption by 40-60%. After the spot beam passes through the cuvette, the spot beam is restored to the original beam through this group of restoration lenses (wide difference correction system), and is divided into several fixed wavelengths (about 10 or more wavelengths) by the grating. The optical/digital signal direct conversion technology is used to directly convert the optical signal in the optical path into a digital signal. It completely eliminates the interference of electromagnetic waves to the signal and the attenuation in the process of signal transmission. At the same time, the optical fiber is used in the signal transmission process, so that the signal can achieve no attenuation, and the test accuracy is improved by nearly 100 times. The closed combination of the optical path system makes the optical path without any maintenance, and the light splitting is accurate and the service life is long.
Constant temperature system: Since the temperature of the biochemical reaction has a great influence on the reaction results, the sensitivity and accuracy of the constant temperature system directly affect the measurement results. The early biochemical instruments used the method of air bath, and later developed into a dry bath with constant temperature liquid circulation which combines the advantages of dry air bath and water bath. The principle is to design a constant temperature tank around the cuvette, and add a stable constant temperature liquid that is odorless, non-polluting, non-evaporating and non-deteriorating in the tank. The constant temperature liquid has a large capacity, good thermal stability and uniformity. The cuvette does not directly contact the constant temperature liquid, which overcomes the characteristics of the water bath type constant temperature being susceptible to pollution and the uneven and unstable air bath.
Sample reaction stirring technology and probe technology: The traditional reaction stirring technology adopts magnetic bead type and vortex stirring type. The current popular stirring technology is a stirring unit composed of multiple groups of stirring rods that imitate the manual cleaning process. When the first group of stirring rods is stirring the sample/reagent or mixed solution, the second group of stirring rods performs high-speed and high-efficiency cleaning at the same time. The set of stirring bars also undergoes a warm water washing and air drying process at the same time. In the design of a single stirring rod, a new type of spiral high-speed rotating stirring is adopted, and the rotation direction is opposite to the spiral direction, thereby increasing the stirring force, the stirred liquid does not foam, and reducing the scattering of light by microbubbles. Reagent and sample probes are based on the principle of early capacitive sensing, but slightly improved to increase the alarm of blood clots and protein clots, and re-test results according to the alarm level, reducing sample aspiration errors and improving the reliability of test results. . Large-scale biochemical instruments can detect more than 1,000 tests per hour, so automatic retesting is very important. Subjective evaluation of test results and manual retesting can no longer meet clinical needs.
Other aspects: barcode recognition of reagents and samples and computer login. Due to the lack of barcode recognition function of early biochemical instruments, there are more opportunities for errors. In recent years, both imported and domestic chemical instruments have adopted barcode detection. The use of this technology in biochemical instruments has provided technical support for the development of high-speed ACA, and also made the instrument quite supportive. The software development is simple and easy, therefore, barcode detection is the basis for the intelligence of the instrument. Open reagents, as an important factor for hospitals to choose models, whether the instrument supports open reagents is very important. After the reagents are opened, hospitals and scientific research units can choose their own reagent suppliers, and have a greater degree of freedom in measuring the price, the reliability of the test results, and the validity period of the reagents. Ion Selective Electrode Analysis Accessory (ISE), human serum and urine electrolyte indicators are very important, and hospitals can save money by adding ISE to the ACA system.
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