Track: Automation and Control

Abstract

In this work, a system for approximating soil NPK (Nitrogen- Phosphorus-Potassium) level, from the measured pH value of the soil was developed. The moisture level of the soil was also determined. The proposed system’s design involves the use of soil moisture sensor, pH sensor, and peristaltic liquid pump with silicone tubing (12V DC power) employed as the actuator. The system is mobile and can be easily transported from one place to another. Extensive literature review revealed that most researchers determine the NPK level of soil from the reference chart of pH level 0-7 which considers only the acidic level. This is due to the fact that the required nutrients for most crops are present in the soil of pH level of 4.5-7.0. However, crops like asparagus, beans, and garlic can yield optimally in alkaline soil of pH level of 6.5-8.0.This justifies the need to extend our findings to alkaline pH level. The develop system approximate the NPK level of both acidic and alkaline soil, from the measured corresponding pH value.  The actuator is explored for necessary action of irrigation and fertigation if required after determine the moisture level and the NPK level.