几种土壤参数测定仪器的实验室标定

Laboratory calibration of several instruments for measurement of soil parameters

对土壤含水率、电导率和pH值等参数的实时、准确测定是实现精准灌溉的前提,对我国目前科研和生产中常用的几种土壤参数测定仪器进行实验室标定,分析这些仪器测试结果的可靠性。结果表明TDR和土壤电导率仪测定土壤含水率和电导率的精度较高、操作简单;土壤酸碱度仪和三合一测定土壤含水率具有较好的精度、且测定快速简单,稳定性好,在使用时根据土壤特性和作物品种确定适宜的灌水控制值,但三合一不适宜用来测定土壤pH值;四合一测定土壤含水率稳定性差;土壤电导率和含水率之间呈现为负相关关系,随着含水率的增大,电导率呈现下降的趋势。研究结果能够为作物生产中土壤参数测定仪器的选择提供参考依据。

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.