Build me an NPK Sensor

I am looking for someone expert in sensor technology. The proposed sensor(s) is/are to be able to measure the concentrations of Nitrogen, Potassium, and Phosphorous in wet soil. The sensor(s) should be able to be integrated into a. microcontroller. A specially skilled instrumentation engineer with experience in designing and building sensors is most appropriate. Further details can be shared on ward of the prpject