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We believe that the soil nutrient tester should pay attention to the following aspects: The state has strict management on the production of measuring instruments, and the soil fertilizer meter belongs to measuring instruments. The performance and reliability of the prototype must be verified by the supervision and inspection department of the measurement products. 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 comply with the requirements of the National Certification Regulations "G179-90" and electronic measurement instruments related to power supply test, environmental test and safety test, and the metering management department can issue the prototype test certificate of the measurement instrument. Based on the qualified prototype test, the technical supervision department The production facilities, personnel technical level, technical documents, verification conditions, management system and other production conditions shall also be evaluated and the measurement instrument manufacturing license certificate issued only after the assessment.
It should be pointed out that the prototype test certificate only shows that the performance of the instrument has met the requirements of the national verification regulations. For the soil nutrient test of the soil nutrient tester, it generally meets the accuracy requirements for the determination of nitrogen and potassium, and for the determination of organic matter and phosphorus. However, there is no guarantee that the stability error of JJG179-90, for example, should be less than 1.5%, and when the phosphorus content is less than 10 mg/kg, and the organic matter content is lower than 10 g/kg, the stability error is only lower than 0.5% (preferably low. At 0.3%, this is a calibration standard for a grating type 1 spectrophotometer to meet the requirements of the Department of Agriculture's Soil Analysis Technical Specification for parallel measurement tolerances. Therefore, when purchasing an instrument, it is necessary to physically check the stability of an instrument. The inspection method is: 1 Turn on the power to warm up the instrument for 5 to 10 minutes; o Cover the instrument shading cover, adjust the instrument so that the display reads zero; Observe the changes in the reading of the instrument, the difference between the maximum and minimum readings of the instrument within three minutes A full-scale reading is the instrument's stability error. As the saying goes, the instruments are not afraid of instability, and unstable instruments cannot be used.
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Soil nutrient tester selection techniques
In the long-term farming, people have summed up a set of farming experience. Today, fertilizer fertilization is prevalent, and the existence of empirical fertilization is very common. However, the experience of fertilization also leads to the imbalance of nutrients, which not only reduces the fertilizer efficiency, but also reduces farmland production, but also leads to environmental pollution. Therefore, balanced fertilization and soil testing and fertilization have become national agricultural technologies. Soil testing and fertilization need to rely on soil nutrient analysis, many years of practical experience shows that whether or not a good selection of soil nutrient testing instrument is often the key to the success of soil testing and fertilizer.