What are the decisive factors of soil fertilizer meter?

There are 16 kinds of nutrients for plant growth, namely nitrogen, phosphorus, potassium, sulfur, calcium, magnesium, carbon, hydrogen, oxygen, boron, iron, molybdenum, copper, zinc, manganese, and chlorine, except that carbon dioxide and oxygen are from the air. Absorption, and the rest need fertilizer to varying degrees to meet the normal growth needs of the crop. Among them, nitrogen, phosphorus, and potassium are a large number of elements, and sulfur, calcium, and magnesium are intermediate elements, and the rest are trace elements. In addition, there are some beneficial elements such as silicon-containing fertilizers. Although the demand for these elements varies greatly among plants, it plays an equally important role in plant growth and development and cannot be replaced with each other.

Soil Fertility Meter is a special instrument that is only used to determine the nutrient content of soil or fertilizer, and uses filter technology or light emitting diodes as the light source. The instrument function is not redundant and the cost is low. The quickness of the soil fertilizer meter is determined by 3 main conditions: 1 whether it can measure the soil quickly, that is, whether it can quickly determine the soil sample moisture, otherwise it will need to wait for the soil sample to air dry, which greatly prolongs the test cycle. 2 The most commonly used at the grassroots level is the determination of available nitrogen, phosphorus and potassium, and the nutrients must be leached from the soil sample before testing. This step is called leaching. According to conventional methods, NPK needs to be leached for 30 minutes respectively, and its extraction time often accounts for more than 2/3 of the test time, while rapid measurement uses three nutrients for simultaneous leaching for 5 to 10 minutes (also called N and P). Potassium co-extraction) is quick, depending on whether it uses a combined leaching technique for leaching. The instrument without the combined leaching method is almost the same as the test method used in the laboratory, and it is basically not fast. . If the joint extraction method is used, it depends on whether his method has passed the scientific appraisal because the nutrients extracted from some unidentified extraction methods cannot truly reflect the state of soil nutrients, and it is difficult to guide the fertilization. 3 depends on the availability of finished pharmaceutical products, grass-roots and mobile services generally do not have the conditions for the preparation of pharmaceuticals, and after the preparation of pharmaceutical preparations to be tested in order to use. If you are using existing equipment, it will not only require certain technicians and equipment, but it will certainly not be able to get up quickly. It cannot guarantee the accuracy of the test. If the instrument is equipped with an agent, it is also necessary to see if it is a semi-finished product, and how long the formulated shelf life is. Do not just look at the instructions to judge the quickness of the instrument. Some of the instrument's instructions only describe the colorimetric process during the test (adding the drug color to read the measured value), avoiding the entire process of testing, including the preparation of pharmaceuticals, measuring the moisture content of fresh soil, and nutrient leaching. The latter is the most time-consuming part.

The soil-fertilizer is a comprehensive tester that can comprehensively measure a variety of nutrients in the rural basement and is separated from the laboratory. It requires more than one instrument for comparison with the laboratory. Significantly reduce the cost of testing, significantly increase the speed of testing, and can not reduce the accuracy of soil nutrient testing. Moreover, these technical requirements must all be achieved under the conditions of the grassroots personnel and equipment in the village and even Portable and mobile service conditions. Therefore, his technical requirements are not simply the requirements of the instrument itself, but involve a series of supporting technical systems including instruments, methods, pharmaceuticals, and auxiliary devices. Therefore, the laboratory test method is simply applied to the filter photoelectric colorimeter. Such a "quick tester" cannot be quickly, conveniently, inexpensively, and accurately required under the conditions of the base layer.