1. Chemical incremental method. When cucumber grows 1 to 3 true leaves, the flower buds of the leaf axils of the second to the 21st node will gradually differentiate, but it has not been determined whether it is a female or male flower. At this time, spraying ethephon is the best time. The spraying concentration of ethephon is generally 100~200 mg/L. If it is sprayed twice, 200 mg/L is effective; sprayed 3 times, 100 mg/L is effective, just spray 1-2 times. When spraying, use a sprayer to spray the front and back of the leaves at 4 pm on a sunny day. 2. Shading to control light. Cucumber is a short-day crop, and artificially shortening the light can increase the number of female flowers. Before cucumber flowers are formed, in summer, the use of black shading nets with lower shading rate can reduce the average daily temperature of the cultivation bed by 1.4℃, the average ground temperature of 5 cm by 2.1℃, and the average light intensity by 66.2%, reducing the daily sunshine hours Control within 9 hours. 3. Increase moisture and nitrogen fertilizer. The yield of cucumber planted in soil with 80% humidity is more than twice that of planting in soil with 40% humidity. It is necessary to ensure that the cucumber has sufficient water conditions, irrigate in time, and maintain a moist environment. In the early growth and development of cucumber, if sufficient nitrogen fertilizer is ensured, the number of female flowers can also be increased. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. 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.jilinsinoscience.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.