Winter crops have good boron supplementation effect
Among the winter crops, cruciferous crops account for a large proportion, such as cabbage, cabbage, radish, rapeseed, etc. These crops are particularly sensitive to boron. At the same time, celery, wheat, carrots, etc. are also sensitive to boron. Boron deficiency is not only severely affected by reproductive growth, but also vegetative growth is blocked, cold resistance is reduced, and heart rot is easily induced. So how do you make up boron? The application method is as follows:
As base fertilizer: Boron fertilizer has the best effect on the soil with moderate or severe boron deficiency; 0.5~0.75 kg of borax per mu can be mixed with dry fine soil or organic fertilizer, then ditch strip application or hole application; or with nitrogen Phosphorus, potassium and other fertilizers should be mixed together and applied together; avoid direct contact of the boron fertilizer with seeds (live) or seedlings (transplanting), so as not to affect the growth of germination, emergence and roots and seedlings; it should not be deeped or applied. The dosage should not be too large; if the amount of borax applied per mu is more than 2.5 kg, the emergence rate will drop, and even the dead seedlings will be reduced.
Treatment of seeds: immersion in borax or boric acid, usually first dissolve the borax with hot water at 40 ° C, then add cold water to 0.01% ~ 0.03% of borax or boric acid solution, pour the seeds into the solution, soak for 6 ~ 8 hours The ratio of seed to liquid is 1:1, and it can be sown after being taken out and dried.
Foliar application: use 0.1%~0.25% borax or boric acid solution, spray 40~80kg solution per acre, once every 6~7 days, even spray 2~3 times; foliar spray in the afternoon Well, spray to the leaves is full of mist drops; if it rains within 6 hours after spraying, it should be sprayed once.
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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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