What elements of soil are mainly detected by soil nutrient testers? Which model is fully functional?

The time taken for soil test results varies depending on the test project and the actual situation of the laboratory, and in general, it takes 2-15 days for common soil test indicators to produce results.

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First of all, there are many types of soil testing indicators, including organic matter, total nitrogen, available phosphorus, available potassium, pH value, salinity, heavy metals, microorganisms, etc. These metrics vary in how they are measured and processed, so the time to results varies. For example, soil heavy metal testing usually takes 5-7 working days, while soil organic matter and pH testing is faster, usually taking 2-3 days.

In addition, the actual operation of the laboratory can also affect the time it takes to produce results. For example, the number of equipment in the laboratory, the number of samples, the skills and experience of the testing personnel, etc., can all have an impact on the testing time. If the number of samples is large or the equipment fails, it may lead to longer testing times.

To ensure soil testing.

For the accuracy and reliability of the results, laboratories need to follow certain operating procedures and quality control measures when carrying out soil testing. These measures include sample collection, preservation, processing, and analysis, which require a certain amount of time and manpower. Therefore, the time for the results of soil testing indicators is not fixed, but depends on the specific situation.

Generally, it is nitrogen, phosphorus, potassium, calcium, magnesium and other elements. At present, TPY-6PC should be used more, which can detect available nitrogen, available phosphorus, available potassium, total nitrogen, total phosphorus, total potassium and organic matter content in soil, plants, chemical fertilizers, biological fertilizers and other samples.

It is mainly used to measure and analyze soil nutrients. At present, the TPY-6A of Top can be used to detect available nitrogen, available phosphorus, available potassium, total nitrogen, total phosphorus, total potassium, organic matter content in plants, chemical fertilizers, biological fertilizers and other samples, soil pH and soil salinity.

The main objects of soil nutrient testing are nitrogen, phosphorus and potassium.

Soil nutrients are nutrients that are necessary for plant growth provided by the soil. Mineral nutrients in the soil that can be absorbed by plant roots, either directly or after transformation. It includes 13 elements such as nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, boron, molybdenum, zinc, manganese, copper and chlorine.

Nutrients are classified as macroelements, medium elements, and trace elements. In natural soils, soil minerals and soil organic matter are the main ones, followed by atmospheric precipitation, slope seepage and groundwater. In cultivated soils, fertilization and irrigation are also used.

According to the difficulty of absorption and utilization of nutrients by plants, they are divided into fast-acting nutrients and delay-acting nutrients. Generally speaking, available nutrients only account for a small part, less than 1% of the total amount, it should be noted that the division of available nutrients and delayed nutrients is relative, and the two are always in dynamic equilibrium.

In agricultural production, it is an important part of obtaining high-quality and abundant yields of crops to adjust the condition of soil nutrients and spring equinoxes to meet the nutrient needs of crops at different growth and development stages. Understanding the status of soil nutrients can provide a theoretical and scientific basis for scientific fertilization, zonal management of nutrients and effective control of farmland nutrient loss.

The main object of soil nutrient testing is soil

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OneSoil nutrient testing process

1.For the preparation of soil extractant, take a bag of soil extractant powder, pour it into a beaker, mix and dissolve, pour 500ml into a volumetric flask, and shake it well.

2.The preparation of the solution to be tested is called taking an air-dried soil sample, pouring it into a triangular bottle, adding 20ml of soil extractant in a triangular bottle, and shaking well. Pour a spoonful of soil decolorizer into a triangular flask, shake well, and filter the filtrate into another triangular flask with quantitative filter paper, which is the soil available nutrient to be tested.

3.Add the reagent dropwise, absorb 2ml of the soil test solution with a straw in a small test tube, and add 4 drops of soil available phosphorus 1 reagent to the test tube.

4.Drop soil available phosphorus 2 reagent, 1 drop soil available phosphorus 3 reagent, shake well, and let stand for 10 minutes. Two.

Pour the solution to be tested into the cuvette, put it into any channel of the instrument, close the lid, click on the physical and chemical analysis, and click on the box below the project name. Click to detect soil available phosphorus.

5.The test result is completed when the cursor stops rotating.

Soil fertilizer nutrient content tester can detect soil. Nitrogen, phosphorus, potassium, organic matter, soil pH, soil salinity, and trace element content such as calcium, magnesium, and zinc in nitrogen plants and fertilizers.

The soil fertilizer nutrient content tester adopts a rotating colorimetric cell design, equipped with multiple rotary detection channels, which can detect different samples at the same time, and the detection rate is greatly improved. Soil fertilizer nutrient content tester is used to ensure the stability and safety of agricultural production.

2. What are the soil composition testing items?

The third-party testing of soil mainly includes rock organic, ammonium nitrogen, nitrate nitrogen, phosphorus, nitrogen, potassium, calcium, magnesium, sulfur, iron, boron, molybdenum, zinc, manganese, etc.

Routine soil testing items include: arsenic, cadmium, chromium, copper, lead, mercury, nickel, carbon tetrachloride, chloroform, chloromethane, 1,1-dioxane, 1,2-dioxane, 1,1-dioxyethylene, cis-1,2-dioxyethylene, trans-1,2-dioxyethylene, dioxane, 1,2-dioxane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, tetrachloroethylene, 1,1,1-trichloroethane,

1,1,2-Trichloroethane, trichloroethylene, 1,2,3-trichloropropane, vinyl chloride, benzene, chlorobenzene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, ethylbenzene, styrene, toluene, m-xylene + paraxylene, o-xylene, nitrobenzene, aniline, 2-chlorophenol, benzo[ ]anthracene, benzo[ ]pyrene, benzo[ ] fluoranthene, benzo[k]fluoranthene, dibenzo[ , h]anthracene, indeno[1,2,3-cd]pyrene, naphthalene, etc.

<>1. Volumetric method, potassium dichromate oxidation oil bath heating method to determine soil organic matter content;

2. Potassium dichromate capacity method, the determination of organic matter in the soil is to use a highly oxidizing potassium dichromate sulfuric acid solution to undergo a redox reaction with the organic carbon in the soil, and there is a quantitative relationship between them, and then the remaining potassium dichromate is titrated with a standard reducing agent;

3. Visual colorimetric method, the principle of determination, a series of standard reference substances of different concentrations of glucose standard solution are used, and potassium dichromate is used to oxidize soil organic matter, and the color of the oxidized solution is correlated with the content of organic matter in a straight line, and the results are directly obtained through the colorimetric control with the standard reference substance;

4. The burning method, the principle of measurement, is to determine the change in the weight of the soil before and after burning.

How to operate and use the soil nutrient detector:

First, the configuration of the drug.

1.Prepare a stirring bar, 500ml of distilled water, a volumetric flask, soil extractant, scissors.

2.Take a bag of extractant and put it into a volumetric flask, and add 500ml of distilled water to set the volume.

2. Preparation of the solution to be tested.

1.Prepare suction balls, droppers, decolorizing agents, triangular bottles, soil samples, electronic scales, and extractants.

2.Use a balance scale to take a sample gram of soil and put it into a extraction bottle.

3.Use a straw to draw 20ml of extractant into the extraction flask, vigorously**.

4.Pour one level scoop of decolorizing agent into the extraction flask and vigorously for 3 minutes.

5.**After completion, filter into a clean triangular flask with aluminum for the soil available nutrients to be tested.

6.Taking ammonium nitrogen as an example, prepare a suction ball, a dropper, a reagent, a solution to be tested, three test tubes, and an extractant.

7.Absorb 2ml of extractant as a blank solution, and absorb 2ml of soil solution to be tested.

8.Add 1 drop of soil nutrient standard stock solution to the standard solution and shake well.

9.4 drops of ammonium nitrogen No. 1 reagent were added in turn and shaken well; 4 drops of ammonium nitrogen No. 2 reagent were added in turn and shaken well; Add 4 drops of ammonium nitrogen No. 3 reagent in turn and shake well.

3. Soil nutrient speed tester is operated on the machine.

1.Preheat the machine ahead of time and turn the left wheel to 1.

2.Pour the blank solution into the cuvette, press the colorimetric key to adjust to 1e, press the adjustment key 100, and wait for e to disappear.

3.Pour the standard solution into the cuvette, press the colorimetric key to adjust to 3e, press the adjustment key and wait for e to disappear.

4.Finally, the solution to be measured is placed in the optical path to display the value.

Fourth, the results of the soil nutrient tachymeter are printed.

Press the OK button once, then press Adjust + to the screen display n3, then press the print button twice to get the result.

Soil laboratories are commonly equipped with the following types of soil testing instruments:

1. Soil acidity meter: used to quickly measure soil pH value, soil pH value is a very important value that affects crop growth, soil acidity meter is one of the indispensable instruments.

2. Soil moisture tester HM-WSYP: used to measure the moisture content in the soil. The moisture content of most plants is generally 20% to 60%, and the soil moisture content is less than 20% or 60% higher, which has a fatal impact on the growth of crops.

Therefore, the soil moisture content tester is also a necessary testing instrument in the laboratory.

3. Soil conductivity and salt integrated tester: used to quickly measure the salt content in the soil and the conductivity value in the nutrient solution. The soil salinity value can be used to determine whether the nutrients required for crop growth can be met or surplus, so that solutions can be taken in time.

Excess soil salinity can easily lead to soil salinization, and the soil salinity tester can also directly determine whether the soil has been salinized.

4. Soil nutrient tester: used to measure soil nitrogen, phosphorus, potassium, calcium, magnesium and other medium and trace elements. The content of various trace elements in the soil will lead to the absorption of various nutrients by crops, and too much or too little of various medium and trace elements will lead to different diseases of crops.

The content of nitrogen, phosphorus and potassium is a must-test item in soil testing and fertilization.

Common: pH Meter, Oven, Balance, Thermostatic Water Bath, Oil Bath, Electric Hot Plate, Spectrophotometer, Centrifuge, Kjeldahl Nitrogen Meter, Flame Photometer, Flow Analyzer. All kinds of glass tubes, all kinds of glass bottles, all kinds of plastic tubes, all kinds of plastic bottles, aluminum boxes, sealing bags, weighing papers, pH test papers, scissors, glue, pens, registration books, etc.;

High-end: atomic absorption spectrometer, TOC instrument, element analyzer, atomic emission spectrometer, ion chromatograph, gas chromatograph, liquid chromatograph, isotope mass spectrometer, etc.

Key equipment for soil pretreatment: soil drying oven.

The soil testing instruments commonly equipped with soil laboratories are usually as follows:

1. High-precision soil nutrient detector HM-GT2:

1. It can detect available nitrogen, available phosphorus, available potassium, total nitrogen, total phosphorus, total potassium, organic matter, pH and various nutrients and elements in soil, chemical fertilizer and organic fertilizer (including foliar fertilizer, water-soluble fertilizer, spraying fertilizer, etc.).

2. Android intelligent operating system, using more efficient and humanized operation, the instrument is equipped with WiFi network upload, 4G network transmission, GPRS wireless remote transmission, and fast data upload.

3. The built-in crop expert fertilization system can calculate the recommended fertilizer amount for the target yield of more than 100 kinds of national agriculture, fruit trees and cash crops, and scientifically guide agricultural production according to the fertilization formula.

2. High intelligent soil heavy metal detector HM-ZSC:

1. Reliable performance, working stability is better than the national standard JJG79-90 standard 5--6 times, repeatability to reach the grating spectrophotometer index, using microprocessor technology, single-chip microcomputer control, touch buttons, easy to operate.

2. The heavy metal test adopts joint digestion and sub-item testing technology, which simplifies the testing process, reduces the testing time, greatly improves the testing efficiency and improves the testing accuracy.

3. Strong scalability, the instrument can not only be dedicated to the detection of heavy metals, but also can be extended to measure the nutrients in soil, fertilizer, and plants.

3. Soil moisture temperature salinity pH detector HM-WSYP:

1. It adopts an integrated structure design and an external SD card, which can accurately measure the soil temperature, moisture, salinity and pH of the measured site, and upload the environmental factor measurement data of the measured point with one click. At the same time, the data can also be exported directly to the computer through the external SD card.

2. This machine is small in size, beautiful, simple and convenient to operate, reliable in performance, and extremely convenient to carry in the field. After the host is connected to the sensor, the recording can be stored manually, or the sampling interval can be set arbitrarily by the host to automatically store the recorded data.

3. Large-screen color LCD screen, the whole process tracks and records the value, number of groups, and low-voltage warning of each measured environmental factor, and the host has a built-in large-capacity memory, which can store 300,000 pieces of data, and has the function of automatic storage and protection of power-off data.

4. After each sensor is inserted into the host, the host has an automatic identification function, the sensor consistency is good, and the sensor can be combined according to the demand, and the sensor interface of different parameters can be converted to each other, which has no impact on the measurement accuracy.