How to choose soil fertilizer quick tester

1. Select a product with a prototype test certificate for measuring instruments and a manufacturing license for measuring instruments. The state has strict management of the production of measuring instruments. The soil fertilizer meter is a measuring instrument. The performance and reliability of the prototype must be verified by the supervision and inspection department of the measurement product. Inspection and verification; for example, the filter-type photoelectric colorimetric soil-fertilizer tester 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, in order to be issued by the measurement management department measurement instrument prototype test certificate. Based on the sample tests, the technical supervision department shall also assess the production facilities, personnel technical level, technical documents, verification conditions, management system and other production conditions, and rectify those that do not meet the requirements within a set 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 apparatus. When the equipment is purchased through the publicity materials, 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 with a light shield, 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), conductance, nutrient determination of various 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 readily 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. Selecting the quickest test of the soil-fertility meter test in the whole process 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 supporting technologies. At present, although China's soil fertilizer meter claims to be a speedometer, many of them are copying conventional test methods and have no real speed measurement technology. The self-reported test speed often refers to only one item (rather than 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. There are roughly two types of conditions for the use of soil-fertilizers and soil-fertilizers that are suitable for their own use conditions. The first category is the units without laboratories, such as agricultural technical stations, crop hospitals, agricultural science and technology demonstration villages, etc. The 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 must be miniaturized, lightened, and positioned; the amount of test drugs should be minimized as much as possible. 6. Selecting the best post-sale service conditions to measure soil 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, equipment maintenance, spare parts and drug supply, and speed. The supply of the conversion factor for the measured value to the conventional value, the method for determining the amount of the fertilizer to be determined based on the measurement result, and the like. It can be considered that 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 manufacturers that provide services for the use of instruments at the same time. Manufacturers often provide quick measurement of conventional conversion factors and fertilization technical guidance. It is advisable 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 select the best soil fertilizer meter after the sale service.

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