Laboratory calibration of several instruments for measurement of soil parameters
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Abstract:
Real-time and accurate measurement of soil parameters，such as soil water, soil electrical conductivity and pH, is the premise to realize precise irrigation. Laboratory calibration of several instruments for measurement of soil parameters now used in research and agricultural production was conducted in this paper to test the reliability of these instrument test results. The results showed that the instruments of TDR and soil electric conductivity meter were simple operation and the test results showed high precision. When measuring soil water, the test results of pH meter and three-unity showed better accuracy and high reliability, the two instruments also had the feature of simple operation. But suitable soil water controlled value should be determined according to the properties of the soil and the crop or vegetable when using them. The instrument of three-unity was not suitable for using in pH measurement. The instrument of four-unity showed low reliability when measuring soil water and was not suitable for use in agricultural production. The content of soil electrical conductivity and soil water showed negative correlation, soil electric conductivity showed the tendency of decline with the increase of soil water. The results of this paper can provide reference for the choice of instruments for measuring soil environmental parameters in agricultural production.
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