1. The country that has selected prototypes of measurement instruments prototype test certificates and manufacturing licenses of measuring instruments has strict management of the production of measuring instruments. The soil fertilizer instrument belongs to measuring instruments and must be inspected and verified by the supervision and inspection department of measurement products on the performance and reliability of the prototype. For example, the filter-type photoelectric colorimetric soil-fertilizer instrument is required to test the stability, repeatability, sensitivity and linearity error of the instrument, and also to verify the vibration resistance, temperature resistance, and insulation safety of the instrument. It must meet the requirements of the national verification regulations JJG179-90 and electronic measurement instruments related to the power supply test, environmental test and safety test before the metering management department can issue a prototype test certificate for measuring instruments. Based on the sample tests, the technical supervision department shall also assess production conditions such as production facilities, personnel technical level, technical documents, verification conditions, and management systems, and rectify those that do not meet the requirements within a specified time limit; The issuance of a measuring instrument manufacturing license. These two certificates are basic guarantees for product quality. Unlicensed products or products with incomplete certificates are irregular products and illegal products. It is dangerous to purchase such products.

2. It is important to check the stability of the soil-fertilizer. When the equipment is purchased through an error, it is important to check the stability of the equipment. The inspection method is:

1 Turn on the power to warm up the instrument for 5-10 minutes.

2 Cover the instrument shading cover and adjust the instrument so that the display reads zero.

3 Observe the instrument reading changes. The difference between the maximum and minimum readings of the instrument within three minutes divided by the full-scale reading is the instrument's stability error. As the saying goes, the instruments are not afraid of instability, and they are not afraid of instability. Stable unqualified instruments cannot be used.

3. There are many test items for soil fertilizer meter with complete basic test items. In addition to soil nitrogen, phosphorus, potassium and organic matter, there may also be trace elements, soil pH (pH), conductivity, various nutrient determination of fertilizers, and plant nutrition diagnosis. and many more. However, the purchase must pay attention to meet the needs of testing the basic items of soil fertigation. These basic items are available nitrogen (where total nitrogen is available), available phosphorus, available potassium, and organic matter. Effective nitrogen includes available nitrogen (ammonium nitrogen, nitrate nitrogen) and easily hydrolyzable organic nitrogen. At present, there are many soil fertility meters in China that can meet the testing needs of these basic projects. If some of them cannot measure nitrate nitrogen, Some cannot measure organic matter, and more cannot measure alkaline nitrogen (or total nitrogen), which does not guide fertilization very well. The basic test items of the soil fertilizer meter are complete. Just look at its promotional materials or instructions.

4. Choose the quickest soil fertilizer meter for the whole process of testing

The quickness of the test is the most important to reduce the test cost. Routine analysis of a soil sample generally takes 3-4 days, so the cost remains high. When buying an earth fertilizer meter, it mainly depends on the speed of the soil pre-treatment process, the instrument calibration speed, the drug formulation speed, and the application of other rapid measurement matching technologies. At present, although China's soil fertilizer meter is claiming to be a speedometer, many of them are copying conventional test methods. There is no real speed measurement technology. The self-reported test speed often refers to only one item (not a soil sample). The test time, or just the measurement time, does not include the pre-processing and preparation time. Therefore, it is not the test speed of the entire test. This should be noted when purchasing.

5. Select the soil fertilizer meter suitable for your own use conditions

There are roughly two types of conditions for the use of soil-fertilizer use units: the first type is units without laboratories, such as rural agricultural technology stations, crop farms, agricultural science and technology demonstration villages, etc. Fertilizer plant mobile agrochemical services also fall into this category. . Units of this type of use conditions are required to be able to easily carry the soil-fertilizer instruments and their accessory items to the site, complete the soil nutrient analysis under the conditions of leaving the laboratory, and require the instruments and their accessories to be easily maintained and not easily damaged. Generally, they can be used for portability. , supporting a good photoelectric colorimetric soil fertilizer instrument. The second category is the units that have laboratories, such as the county soil and fertilizer stations, agricultural company inspection centers, and so on. Such laboratories do not require the compatibility and portability of soil-fertilizers in the laboratory, and can be selected for bench-top or portable photoelectric colorimeters. When selecting a portable soil-fertilizer, it depends not only on whether it has a portable packaging, but more importantly, from simple balances, to washing bottles to wiping mirrors, all utensils, materials, and utensils used in the tests must be readily available. Matching items should be miniaturized, lightened, and positioned; the amount of test drugs should be minimized as much as possible.

6. Choose the best soil treatment instrument for after-sales service

Soil testing and fertilization is a complicated technical process. To make full use of the fertilization meter to guide the role of fertilization, it must be supported by after-sales services. It includes after-sales training, instrument maintenance, spare parts, and supply of medicines, and the conversion coefficient of rapid measurement values ​​to conventional values. Provide methods for determining the amount of fertilizer to be applied based on the results of the determination. It can be considered that the manufacturers of soil fertilizers can be divided into two categories. One is manufacturers who only provide equipment (or who is responsible for training and maintenance) regardless of the use effect. The other is a manufacturer that provides services for the use of instruments at the same time. Manufacturers often provide quick measurement of conventional conversion factors and fertilization technical guidance, and it is best to cooperate with local soil fertilizer systems or other capable agrochemical service units to establish provincial service networks. When you purchase an earth fertilizer meter, you should compare the service capabilities of the manufacturers, and choose the best soil fertilizer meter for after-sales service.

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