Recently, many vegetable farmers have reported that the stems of the lower rootstocks of cucumber seedlings that have not been planted soon have cracked, resulting in slow plant growth, and in severe cases, the plants will wilt and die. In general, this situation is a physiological problem of cucumbers, which has a greater relationship with the current temperature and humidity environment and agricultural management. Symptoms 1. The rootstock at the base of the stem is cracked: the rootstock at the base of the stem is whitish and cracked. 2. For severely cracked plants, the growth of plants is relatively slow due to poor transportation of water and nutrients. 3. When the humidity in the shed is high, the cracked parts are prone to infestation by pathogens such as vines and bacteria, causing the diseased parts to turn yellow and rot, and in severe cases, the plants will wilt and die. Cause analysis 1. Uneven dryness and wetness in the shed, uncoordinated plant growth. When the temperature is high, the water evaporates quickly, and it is easy to dry and wet in the shed, which will lead to the inconsistent growth of the plant and the inconsistent growth of the stem inside and outside, which will cause the occurrence of stalk cracking. 2. The drastic change in temperature affects the growth of the plant, which will cause the plant to wilt and cause damage to the outside of the stalk. In severe cases, the stalk may even appear white. These damaged stalks are prone to cracking later. 3. The damage caused by other factors will damage the cortex of the rootstock, and it will not be able to form new tissues normally during the later growth, and the uncoordinated internal and external growth will lead to cracking. Mitigation suggestions 1. Select strong seedlings and remove weak seedlings with damaged rootstocks at the base. 2. Try to avoid sudden dry and wet conditions: water properly according to weather conditions and soil humidity, water for planting water thoroughly, the second and third water should be small and timely, and the water should be properly controlled after slowing the seedling. 3. Shade in time to avoid high temperature and strong light from scorching the plants, especially at noon on a sunny day and when the weather is suddenly sunny. 4. For plants with cracked stalks, control watering and reduce the humidity in the shed. 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 Urine analyzer is an automated instrument for determining certain chemical components in urine. It is an important tool for automated urine inspection in medical laboratories. This instrument has the advantages of simple and fast operation. However, improper use of urine analyzers and many intermediate links and influencing factors directly affect the accuracy of automated analysis results, which will not only cause errors in experimental results, but even delay diagnosis. Therefore, operators are required to understand the principles, performance and precautions of automated instruments. And the knowledge of influencing factors and other aspects are fully understood, and the correct use of automated instruments can make the results obtained by the urine analyzer more reliable and accurate. Medical Urine Analyzer,Semi Automatic Urine Analyzer,Urine Analyzer and Strips,Accurate Urine Analyzer Jilin Sinoscience Technology Co. LTD , https://www.jilinsinoscience.com
application
In the 1950s, a single dry chemical test strip method was used to measure protein and glucose in urine, and the changes in the color of the test strip were observed with the naked eye and compared with the standard plate to obtain the corresponding values. In the 1980s, due to the high development and widespread use of computer technology, automated urine analyzers also developed rapidly, gradually developing from semi-automatic to fully-automated. Urine analyzers are often divided into two categories according to the test items: â‘ 8-11 screening combined urine test strips mainly used for newly diagnosed patients and health examinations. The eight test items included protein, glucose, PH, ketone bodies, bilirubin, urobilinogen, red blood cells (occult blood) and nitrite; in addition to the above eight tests, urine leukocyte test was added to the nine test items. On the basis of 9 of the 10 urine analyzer testing items, the urine specific density test was added. 11 testing items have added vitamin C testing. â‘¡It is mainly used for the observation of the curative effect of the diagnosed diseases, such as the combination test strip of PH, protein and occult blood (red blood cells) for kidney disease; the combination test strip of PH, sugar and ketone body for diabetes; the combination of bilirubin and urobilinogen for liver disease test tape.
principle
This type of instrument is generally controlled by a microcomputer, and the color change on the test strip is measured semi-quantitatively by using a spherical integrator to receive dual-wavelength reflected light. There are several reagent pads containing various reagents on the reagent strip, each of which reacts independently with the corresponding components in the urine, and displays different colors. The depth of the color is proportional to a certain component in the urine, and there is another in the reagent strip" Compensation pad", as the urine background color, compensates for the errors caused by colored urine and instrument changes.
Put the reagent strip with urine adsorbed in the colorimetric tank of the instrument, and the various reagent pads that have produced chemical reactions on the reagent strip are illuminated by the light source, and the reflected light is received by the spherical analyzer, and the photocell of the spherical analyzer is reflected. Irradiate with dual-wavelength light (measurement light passing through the filter and a reference light), and the selection of each wavelength is determined by the detection item.
The instrument automatically calculates the reflectance according to the following formula, and then compares it with the standard curve, and automatically finds and prints the corresponding results of various components. If the content of a certain component in the urine is high, the reflected light of the corresponding reagent pad is dark, otherwise it is strong.
Reflectance fraction: R(%)=Tm.Cs/TsCm×100%
In the formula, R(%) is the reflectivity; Tm is the reflection intensity of the reagent pad to the measurement wavelength; Ts is the reflection intensity of the reagent pad to the reference wavelength; Cm is the reflection intensity of the calibration pad to the measurement defect length; Cs is the calibration pair. Reflection intensity at the reference wavelength.