Method of using soil nutrient speed measuring instrument

The soil nutrient speed measuring instrument is also called soil and soil speed measuring instrument. It is mainly used to measure the moisture, salt, ph value, available phosphorus, calcium, magnesium, boron, etc. in the soil and the nitrogen, phosphorus and potassium content of the fertilizer. In general, we know the fertilizer utilization rate of crops by consulting the data, and if we want to know the nutrient status of the soil, we need to use this soil nutrient speedometer. Below, Xiaobian will give you a brief introduction to the use of the soil nutrient rapid tester.

The soil nutrient measurement values ​​we usually refer to refer to the test values ​​of the conventional methods. This method is a classical method of soil fertilizer and plant nutrition in the past ten years or even hundreds of years of experimentation and practice. It has universal practicability, reliability, comparability and repeatability. However, the conventional method requires a certain amount of capital investment. Even if it is not included in the investment of the house, the investment of reagents, glass instruments and analytical instruments should be at least 30,000 yuan. This condition is more difficult for agricultural technology promotion departments and individual plantation owners at the township level. The speed measurement method came into being.

The quick test method refers to operations performed by simple methods including simple sample processing, simple sample leaching, simple instruments, and the like. The advantage is that the investment is small, the operation is simple, and the technical support is not required. The soil (fertilizer) nutrient speed meter currently on the market is actually an improved version of the previous 72 type colorimeter in China.

According to the instructions provided by the manufacturer, the author has done a comparison test, namely:

(1) using a quick tester and the provided analytical method;

(2) Operate using conventional analytical methods.

Through experimental comparison, it is found that: the results obtained by the two analytical methods: soil available phosphorus has a certain correlation, there is no correlation between available potassium, ammonium nitrogen sometimes has no correlation, and the rapid test instrument basically does not introduce the determination method of nitrate nitrogen. Therefore, according to the method described by the rapid tester, only the data of soil available phosphorus can be correlated with the values ​​of conventional tests, and the nitrogen and potassium closely related to fertilization can only be fertilized according to the amount described in the instrument manual, and cannot be compared with the conventional test value. Contact, so its scientificity and accuracy are questionable.

In addition, the rapid measurement of nitrate nitrogen is also a major defect in guiding fertilization (because the routine testing process of nitrate nitrogen is cumbersome, complicated to operate, and prone to errors, so this method is not easy to measure). It is well known that ammonium nitrogen, nitrate nitrogen and nitrite nitrogen are three states that are easily absorbed by crops. After the fertilizer is applied to the soil, the ammonium nitrogen is unstable in the soil. Under the action of nitrifying bacteria, it can be quickly converted into nitrate nitrogen. Although the content of nitrite nitrogen is low in the soil, it is unstable. It is quickly converted to nitrate nitrogen, so the nitrate content in the soil is generally higher than that of ammonium nitrogen, and the nitrite nitrogen content is the lowest.

Therefore, the best indicator for guiding fertilization is inorganic nitrogen, followed by nitrate nitrogen, and the worst indicator is ammonium nitrogen. The extractant used for the determination of available potassium by the rapid tester is no more than sodium sulfate, sodium nitrate, calcium chloride, etc., and the ammonium acetate recommended in the conventional analysis is not used (because the ammonium ion in ammonium acetate interferes with sodium tetraphenylborate) The measurement of the turbidimetric method), so the data measured by the two can be understood without any correlation.

If fertilization is carried out according to the method described in the manual of the quick tester, (1) there is not a large number of scientific test arguments; (2) the proposed method itself has problems. Therefore, the current speed measurement technology is not accurate, and even there is a suspicion of propaganda misleading. How to simplify the routine analysis method, and develop a test method, which can determine the content of inorganic nitrogen, available phosphorus and available potassium in soil by simple instrument, and the data obtained are correlated with the data determined by conventional analytical methods to guide fertilization. This is one of the main contents of the work of soil fertilizer workers.

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