Analysis of Soil Sampling Error Factors by Soil Nutrient Rapid Tester

Soil measurement is the basis for evaluating soil fertility changes. The accuracy of the soil nutrient rapid measurement instrument for soil nutrient measurement depends on the representativeness of the soil sample. Usually, the sampling error will be greater than the instrument measurement error. To reduce the sampling error, the sampling trees must be increased to reduce the sampling error. Too many soil samples are likely to increase the cost of soil measurement. The soil sampling is too small, and the soil nutrient measurement error is increased. To determine the number of soil sample samples, it is necessary to understand the influence of different factors on the soil sampling error.

The sampling error of different land types, soil nutrient speed meter indicates that due to different soil utilization methods, human activities have different effects on various physical and chemical properties of the soil, which will inevitably lead to changes in sampling error. Between the same sampling plots, at a relative distance of 40, it can be roughly divided into three categories. The first type is pond sediment, which is obviously different from other plots. The second category seems to be dominated by various plot edges. The study originally took the edge of various plots as a relative reference for the differentiation of physical and chemical parameters of human plots; the third category is mainly composed of various cultivated land or plots used for planting, and various types overlap each other, which is difficult to divide. Therefore, it is difficult to reflect the distribution characteristics of different measured parameters in different soil utilization types.

Sampling error of different measurement parameters, the average relative standard deviation calculated according to the classification of the measurement items and the relevant statistics of each measurement item and the area of ​​the sampled plot. The soil nutrient rapid tester indicates the sampling error for each measurement item of different plots. The size is different and can reach more than 150%, such as S and Cl; the small is less than pH and Cl, which reflects the uneven distribution of soil physical and chemical properties. In this study, the sampling error of most of the measured parameters is The area is irrelevant, and only those parameters that are greatly affected by the soil parent material and are less affected by environmental disturbances such as fertilization and tillage are significantly or significantly correlated with the sampling area.

Soil sampling error is inevitable when soil nutrient speed meter is used to measure soil nutrients. By understanding the factors affecting soil nutrient sampling error, soil nutrient measurement accuracy can be improved. Soil sampling error studies show that soil sampling error is related to the area of ​​sampling points, and human activities have a great impact on soil nutrients, which makes the gap between different soil nutrients huge.

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