| Cite this article: | 邬梦龙,牛文全,温圣林,等.应用电导法实时测定磷酸氢二铵和氯化钾混合肥液浓度[J].灌溉排水学报,0,():-. |
| Wu Menglong,Niu Wenquan,Wen Shenglin,et al.应用电导法实时测定磷酸氢二铵和氯化钾混合肥液浓度[J].灌溉排水学报,0,():-. |
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| DOI：10.13522/j.cnki.ggps.2020203 |
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| Real-time determination of the concentration of diammonium hydrogen phosphate and potassium chloride mixed fertilizer solution by conductivity method |
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Wu Menglong1, Niu Wenquan2, Wen Shenglin1, Hezili3, Li Xuekai4,5
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1.Northwest A&F University;2.Research on Soil and Water Conservation, Chinese Academy of Sciences Institute;3.College of Water Conservancy and Construction Engineering, Northwest A & F University;4.Northwest A&5.F University
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| Abstract: |
| 【Background】Water and fertilizer integrated irrigation was an important agricultural management technology in the future. The accurate monitoring of fertilizer concentration was the basis of integrated fertilization irrigation. The existing method of monitoring the electric conductivity（EC） of fertilizer solution could only detect the concentration of single component fertilizer solution. At present, there was still a lack of simple, economic and accurate real-time monitoring technology of mixed fertilizer concentration.【Objective】In order to accurately reflect the concentration of diammonium hydrogen phosphate and potassium chloride with different ratio n under the condition of water and fertilizer integration with the conductivity (EC) value, 【Method】EC of mixed fertilizer solution with a certain mass concentration range (2~10g/L )and different proportions of diammonium phosphate and potassium chloride in the temperature range (20～45℃)was determined.【Results】The results showed that the EC of the mixed fertilizer solution of diammonium hydrogen phosphate and potassium chloride increases with the increase of concentration and temperature, and decreases with the increase of the ratio n. The effect of concentration, temperature and ratio on the conductivity of the mixture of diammonium hydrogen phosphate and potassium chloride was studied by grey correlation analysis. It was found that the order of the three factors affecting the conductivity of the mixture was concentration > temperature > proportion. Based on the goodness of fit, the evaluation index was compared with the data after cubic spline interpolation and cubic B-spline interpolation. The single-factor curve model of the concentration-EC value, temperature-EC value, ratio-EC value of the mixed solution were respectively selected, and the EC, temperature, and ratio n of the diammonium phosphate and chloride potassium mixed solution were independent variable of the concentration prediction models.【Conclusion】The prediction accuracy of the model was 97.53%, which could meet the requirements of practical use, and could be used for real-time monitoring of the concentration of fertilizer solution during the integrated irrigation of water and fertilizer. |
| Key words: mixed fertilizer; ratio value; conductivity; concentration measurement; prediction model |
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