In the long-term farming, people have summed up a set of farming experience. Today, when the application of chemical fertilizers is prevalent, the existence of empirical fertilization is very common. However, experience fertilization also leads to imbalance of nutrients, which not only reduces the fertilizer efficiency, but also reduces the farmland output, and it will lead to environmental pollution. Therefore, balanced fertilization and soil fertilization have become the national agricultural technology. Soil testing and fertilization needs to rely on the analysis of nutrients in the upper soil. Many years of practical experience have shown that the ability to choose a good soil nutrient rapid tester is often the key to the success of soil fertilization.
We believe that the selection of soil nutrient rapid tester should pay attention to the following aspects: the state has strict management of the production of measuring instruments, and the soil and fat instrument is a measuring instrument. The performance and reliability of the prototype must be verified by the metrological product supervision and inspection department. For example, the filter photoelectric photoelectric color soil meter should check the stability, repeatability, sensitivity and linearity of the instrument, and also check the vibration resistance, temperature change resistance and insulation safety of the instrument. It must comply with the national verification regulations "G179-90 and electronic measuring instruments related to power supply testing, environmental testing and safety testing requirements, in order to be issued by the metrology management department to test the prototype of the measuring instrument prototype. On the basis of the prototype test, the technical supervision department It is also necessary to evaluate the production conditions of the production facilities, personnel technical level, technical documents, verification conditions, management system, etc., and pass the assessment before issuing the manufacturing license certificate for measuring instruments.
It should be pointed out that the prototype test certificate only indicates that the performance of the instrument has met the requirements of the national verification regulations. For the soil nutrient test of the soil nutrient rapid tester, the measurement accuracy requirements of nitrogen and potassium can generally be met, and the determination of organic matter and phosphorus is generally required. Accuracy does not guarantee that, for example, JJG179-90 stipulates that the stability error should be less than 1.5%, and when the phosphorus content is less than 10 mg/kg and the organic matter content is less than 10 g/kg, the stability error is only less than 0.5% (best) Less than 0.3%, this is the calibration standard of the grating type l spectrophotometer) in order to meet the requirements of the Ministry of Agriculture soil analysis technical specifications for parallel measurement tolerance. Therefore, the stability of an instrument should be checked in the field when purchasing the instrument. The method of inspection is as follows: 1 Turn on the power to warm up the instrument for 5-10 minutes; o Put the instrument on the light-shielding cover, adjust the instrument to make the display read zero; observe the change of the instrument reading, the difference between the maximum and minimum readings of the instrument within three minutes The full-scale reading is the stability error of the instrument. As the saying goes, the instrument is afraid of being unstable, and the instrument with unsatisfactory stability cannot be used.
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