Soil nutrient measurements can be routinely measured. This measurement has universal utility, reliability, comparability, and repeatability and is a classical method in the soil fertilizer and plant nutrition world. However, the conventional method is relatively expensive. You can also use the quick test method, which has the advantages of low investment, simple operation, and not requiring too high technical support.
Through the comparison of experiments, it was found that the results obtained by the two analysis methods are: there is a certain correlation between soil available phosphorus, effective potassium, and ammonium nitrogen. Sometimes, rapid measurement instruments do not basically introduce the method for measuring nitrate nitrogen. Therefore, according to the method introduced by the speedometer, only the data of available soil phosphorus can be related to the values ​​of conventional tests, and 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 conventional test values. Contact, so its scientificity and accuracy are doubtful.
In addition, the lack of determination of nitrate nitrogen by speedometers is also a major drawback in guiding fertilization (because the routine testing of nitrate nitrogen is cumbersome, the operation is complex, and errors tend to occur, so this method is not easy to quickly measure). As we all know, ammonium nitrogen, nitrate nitrogen and nitrite nitrogen are three kinds of state that crops can easily absorb. After the fertilizer is applied to the soil, the ammonium nitrogen is unstable in the soil and can be rapidly converted to nitrate nitrogen under the action of nitrifying bacteria. The nitrite nitrogen content in the soil is very low, but unstable, it can also Nitrate is quickly converted to nitrate, so the nitrate nitrogen content in the soil is generally higher than 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 extractors used for the determination of potash by the speedometer were not only sodium sulphate, sodium nitrate, calcium chloride, etc., but ammonium acetate in the conventional analysis was not used (because ammonium ions in ammonium acetate interfered with sodium tetraphenylborate. The turbidimetric method was used to measure the data. Therefore, the data of the two assays can be understood without any correlation.
At present, Top Instrument Co., Ltd. has been continuously researching and renovating, and has introduced a soil nutrient differentiation tester, which can complete the determination method of soil inorganic nitrogen, available phosphorus and effective potassium. Compared with conventional analysis methods, the measured data are basically the same. The method has low investment, simple operation and low testing cost. This guides fertilization, makes the agrochemical service not in the form, and satisfies the needs of grassroots fertilizer sales, planting owners, townships, villages and even households. It is undoubtedly It makes sense.
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