How to improve the purity of corn seed
One is to select inbred lines of completely stable traits; the other is to set up isolation zones strictly during expansion; third, to reduce proliferation propagation algebra, and to designate people to bag-purify year-by-year. 2. Set the isolation zone as standard The first is space isolation, which requires space separation between different species of no less than 200m. The second is the isolation of natural barriers. It is required to use natural barriers such as villages, roads, forest belts, and high walls to isolate the space with a space separation of no less than 100m, and to plant 2-5m paternal rows, stilts, and high poles at the edge of farming fields. Crops such as flax are protected. 3 strictly to miscellaneous Seedlings during the seedling stage: When the seedlings are mixed in the 4th to 5th leaves, it is necessary to postpone the removal of the crops with large numbers of mutants and large seedlings. Select the leaves to be carried out at the time of 6 to 7 leaves, and insist on “going big and smallâ€. Stay in the middle" principle. Going to go to miscellaneous: go to the male to go to miscellaneous in late June, according to the parent's plant height, stem thickness, leaf color, blade width, angle between the leaves and the stem and other physiological characteristics of the species carefully screened, Remove the miscellaneous and alien strains, and strictly implement the parent's miscellaneous work in an attitude that “it would rather kill it wrong and not be omittedâ€. 4. Accurately determine the flowering period and timely Timely, clean and thorough emasculation is the key to ensuring corn purity. Corn detasseling in Hexi irrigation area is mainly concentrated from late June to mid-July. Flowering period should be accurately judged, labor should be organized in advance, and dearge should be reasonably arranged. Do the first pass to remove 95% of the tassels, remove the remaining 5% of the tassels twice by emasculation, and then three times to find the missing strains in the middle and around the mantle. In the entire castration process, it is strictly controlled by storm and irrigation. 5. timely removal of the father After pollination, 80% of the parental filaments are wilted and the male parent can be removed. According to the species maturity, it is generally performed from late July to early August. This work should be done sooner rather than later, so that no residue or residue remains. 6. Serious selection in the late period The selection of panicles after harvesting until processing is a guarantee for improving the purity of seeds. In late September, the seeds must be strictly picked before and after harvest. The ear should enter the processing plant to use the conditions of drying and processing line transportation to make the final panicle inspection, removing panicles and spikes. And sick ears, at the same time in the transport, drying, threshing and other aspects to avoid mechanical mixing between varieties. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Urinalysis test strips refer to test strips that test for bilirubin, urobilinogen, ketone bodies, ascorbic acid, glucose, protein (albumin), blood cells, PH, etc. in urine. Urine Reagent Strips,Urine Test Strip,Urine Sugar Strip Test,Visual Urine Analysis Strips Jilin Sinoscience Technology Co. LTD , https://www.contoryinstruments.com
Detection principle
1. pH: The pH value in the range of 5-9 is measured by the pH indicator, and the pH value of the fresh urine of a normal person is between 5-7.
2. Nitrite: The reaction is based on the reduction of nitrate to nitrite by Gram-positive bacteria in the urine. The nitrite reacts with p-aminobenzenesulfonic acid to form diazonium compounds, which are then combined with N-(1-naphthalene) )-3 aminopropanesulfonate combined with a pink color.
3. Glucose: According to the reaction principle of glucose oxidase, glucose oxidase specifically oxidizes glucose to generate glucuronic acid and hydrogen peroxide. Under the action of hydrogen peroxide, hydrogen peroxide oxidizes the indicator and turns color. .
Classification
Urinalysis test strips are divided into visual series and machine series. The visual inspection series is divided into several models according to different inspection items; the machine inspection series is divided into several models according to different applicable instruments.
1. Classification by measurement method
1) Visual inspection series
When observing the result, compare the color with the standard color code within the time specified on the color code, judge and read the result.
2) Machine test series.
For instrument operation, refer to the instruction manual of the Urine Analyzer used.
2. According to the number of measurement items
There are single-item, 2-item, 4-item and multiple test strips. Currently, 10-item or 11-item multiple test strips are most commonly used in hospitals.
3. Classification by structure
Urinalysis test strips with single-layer membrane structure and multi-layer membrane structure.