What kind of environment is conducive to the growth of grapefruit?
Meizhou golden pomelo has high requirements for planting environment, and different environments have a greater impact on the quality of golden pomelo. According to the survey, the local microclimate environment has a great impact on the growth of grapefruit trees and the quality of fruit.
All the four environmental elements that leave the sun, air, water, and soil cannot grow.
Sunlight and air are necessary conditions for fruit trees to synthesize carbohydrates for photosynthesis. The amount of light and the intensity of light are related to the accumulation of carbohydrates. Moisture can be described as the blood of the tree, which can drive the supply of nutrients; the soil is the foundation, the nutrient source of all plants, and the physical and chemical properties and nutrient structure of the soil determine whether the plant grows well or not.
From the perspective of light intensity, the position of the mountain shape has a greater impact on the growth of golden pomelo.
The same mountain gentle slope terraced planting, back north to the south or back to the northeast to the southwest of the hillside, the light hours are long, the pomelo fruit grows well, the fruit can mature early, taste better; and the back south to the north or the southwest to the northeast of the slope, due to Insufficient lighting hours, poor growth of teak trees, fruit quality and fruit quality are also poor. The golden pomelo planted in Gaogang has a high intensity of photosynthesis, a high accumulated temperature, and a large accumulation of carbohydrates. The quality of the fruit is good. The golden pomelo planted at the foot of the mountain, due to insufficient light, low temperature and dampness, poor air circulation, often more diseases, fruit due to insufficient accumulation of carbohydrates, poor quality.
From the perspective of soil, the golden pomelo planted in the flat paddy field is rich in nutrient soil and has plenty of fertilizer and water. The tree grows vigorously, and the fruit is only large, but the taste is general. The golden pomelo planted on the steep slope of the mountain, due to poor soil water retention and fertilizer retention, often has poor growth, but the fruit rate is high (mainly due to drought and flower promotion). Although the fruit is small, it is precocious and has a good flavor.
From the perspective of rain, the water content of pomelo fruit grows differently in different periods.
If the rain is too abundant all year round, the water and fertilizer are absorbed enough, the grapefruit grows vigorously, and the appearance of the pomelo fruit is beautiful, but the lack of light will cause poor taste. If the annual rain is scarce and the water and fertilizer are insufficiently absorbed, the pomelo tree will grow poorly, and the pomelo fruit will be small, but the taste of the pomelo fruit is better because of the light. If the pomelo fruit is close to maturity, it will easily cause cracking (after cracking after internal cracking), especially in orchards with high water retention and poor drought.
The good environment for planting golden pomelo should be gentle slope mountain (preferably about 25 degree angle), with the north facing south or the northeast facing southwest. It is developed according to the contour terrace type (water conservation and fertilizer conservation), strengthening soil and adding organic matter. Fertilizer, combined with the selection of fine varieties, strengthen cross-pollination and promote green standard management, quality is inevitable.
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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.
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.
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