Watermelon planting in greenhouse should pay attention
In the watermelon seedling bed, it is often found that there are some Tewang Miao in the large variety, the stems and leaves are thick and strong, and the growth is very prosperous. There are some weak seedlings in the small variety, the stems and leaves are weak, and the growth is very poor. These special seedlings are scattered in the middle of normal seedlings, and the ratio is generally 2% to 5%. This phenomenon is mainly caused by the presence of 5% of self-crossings in the hybrid seeds. Since the watermelon varieties currently used in production are basically hybrid generations, it is difficult to achieve a hybridization rate of 100% for hybrid seeds, and 2% to 5% of self-crossings are allowed by national standards. The size, quality, commerciality, disease resistance and other traits of the parent melon have a serious disadvantage compared with the normal hybrid melon. However, the self-crossings in hybrid seeds are still not identified, and can only be distinguished after seedlings, so they must be removed on the seedbed and before planting. It is a habit to keep the farmer's seedlings transplanted and transplanted, and the self-crossing seedlings in the small breeds can be eliminated because of the weakness. However, the Tewangmiao in the large variety is often mistaken as a good seedling and remains as a seedling. Therefore, it should be removed when planting, and the planting water should be timely poured after the watermelon is planted. Spraying a new high-fat film 800 times can effectively prevent the ground. The water does not evaporate, the moisture of the seedlings does not transpire, the pests and diseases are isolated, the seedling period is shortened, the new environment is quickly adapted, and the growth is healthy.
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The automatic enzyme immunoassay analyzer is based on the principle that the enzyme and the substrate can produce a color reaction, the absorption lines of different substances have different characteristics, and strictly abide by the Lambert-Beer law, quantitative and qualitative analysis of substances. instrument. The method of analyzing the content of various enzymes such as antigen or antibody generally mainly adopts colorimetric method. In practice, spectrophotometry is the basic working principle of an automatic enzyme immunoassay analyzer. The light emitted by the light source lamp becomes a beam of monochromatic light after passing through a filter or a monochromator. The monochromatic light beam passes through the sample to be tested in the microtiter plate, and part of the monochromatic light beam is absorbed by the sample and reaches the photodetector. The intensity of the light signal projected on it is converted into the magnitude of the electrical signal by the photodetector. This electrical signal is processed by pre-amplification, logarithmic amplification, analog-to-digital conversion, etc., and then sent to the microprocessor for data processing and calculation, and the test results are output by the display and printer. The microprocessor completes the movement in the X and Y directions of the mechanical drive through the control circuit.
The automatic enzyme immunoassay analyzer adds the sample to the microwells of the pre-coated antigen or antibody microtiter plate, washes after the reaction, removes the unseparated ligand, then adds the enzyme isolate, after incubation, washes again , remove the unseparated compound, and then add the enzyme substrate, after the reaction, the colored final product is formed, and the stop solution is added to stop the reaction. The absorbance of each microwell of the microtiter plate is read by the wavelength that has been set by the spectrophotometer. The concentration value of the analyte in the sample is calculated by the absorbance value of the sample and the standard curve, so that the quantitative result can be obtained, or the absorbance of the sample is compared with that of the standard product, so that the positive or negative qualitative result can be obtained.
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