After a summer of nutrient consumption of pear trees, the tree body has gradually weakened, and after fruit harvesting, the fruit trees have entered a period of complete nutrient accumulation, in order to enable the tree to quickly recover and enhance, prevent and control the occurrence of early defoliation and secondary flowering of pests and diseases. After pears are harvested, pear trees must be managed immediately.
1. Strengthen pest prevention and control should pay close attention to pest control. Available 80% of Dasheng M-45 800 times solution, or 20% thiophene 1000 times solution of 10% 4.5% efficient flusterthrin 2000x solution, if the cerumen severe pear orchard can be added 15% of the broom net 2000 times spray. Because the field climate in autumn is suitable for the occurrence of pests and diseases, the frequency of drug use should be increased. According to the degree of damage caused by pests and diseases, the drug should be used once every 15 days to effectively control the hazards.
2) Farmers with drought-resisting conditions must fill the pear garden.
3. Weeding and weed control reduce the consumption of nutrients and water in weeds.
4. Fertilizer and water management Apply fertilizer quickly after harvest to promote tree restoration. Apply urea or compound fertilizer 0.25-0.5 kg per tree according to tree size.
5. Preserving leaves and increasing tree storage and nutrition At the same time, prevention and control of pear diseases and insect pests should be carried out by foliar spraying to keep the leaves green and improve the ability of the leaves to produce photosynthetic products. Potassium dihydrogen phosphate 0.2% + urea 0.2% can be added.
Magnetic Bead Nucleic Acid Extraction Reagent
The magnetic bead method nucleic acid extraction kit is a high-tech product that combines biological science and nanomaterial science. It is a major breakthrough in my country's nucleic acid extraction and purification technology. . Magnetic bead method for nucleic acid extraction has incomparable advantages over traditional DNA extraction methods, which are mainly reflected in: 1. It can realize automatic and large-scale operation. At present, there are 96-well nucleic acid automatic extraction instruments, and the extraction time of one sample can be realized. The processing of 96 samples complies with the high-throughput operation requirements of biology, enabling rapid and timely response to infectious disease outbreaks, which makes traditional methods unmatched; â‘¡ The operation is simple and time-consuming, and the entire extraction process has only four steps , most of them can be completed within 36-40 minutes; â‘¢ Safe and non-toxic, no toxic reagents such as benzene and chloroform in traditional methods are used, and the damage to experimental operators is minimized, which fully conforms to modern environmental protection concepts; â‘£ Magnetic beads and nucleic acids The specific binding of the extracted nucleic acid results in high purity and high concentration of the extracted nucleic acid. According to the same principle as the silica membrane spin column, the superparamagnetic silica nano-magnetic beads are prepared after the surface of the superparamagnetic nanoparticles is modified and modified by nanotechnology. The magnetic beads can specifically recognize and efficiently bind to nucleic acid molecules on a microscopic interface. Using the superparamagnetic properties of silica-coated nanomagnetic microspheres, under the action of Chaotropic salts (guanidine hydrochloride, guanidine isothiocyanate, etc.) and an external magnetic field, samples from blood, animal tissues, food, pathogenic microorganisms, etc. The isolated DNA and RNA can be used in clinical disease diagnosis, blood transfusion safety, forensic identification, environmental microbial testing, food safety testing, molecular biology research and other fields. Magnetic bead nucleic acid extraction can generally be divided into four steps: lysis-binding-washing-elution. Genetic testing will surely become a new symbol of the development of the biological industry. The emergence of high-throughput, automated nucleic acid extraction methods will reduce the labor cost of genetic testing, make large-scale testing a reality, and make it possible for genetic testing to reach ordinary people.
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