Soil pH and nutrient (Nitrogen, Phosphorus and Potassium) analyzer using colorimetry

The study was about creating a device that can use colorimetry to determine the Nitrogen, Phosphorus and Potassium content and pH of the soil to be cultivated by using the chemicals of the Soil Test Kit in giving nutrient recommendations. Trials were done to produce the actual color reaction of the reactants which served as the color references. The RGB values were extracted using TCS3471 color sensor and an LDR color sensor. The device was tested using three samples each for every nutrient and pH with ten trials each. The benchmark value used was 0.05 to have a 95% level of confidence. The computed value of Chi-Square was equal to 0 using the table for the critical values 0.05 corresponds to the critical value of 3.841. Therefore, computed value was less than the critical value which can be concluded that there was no significant difference between the proposed device reading the soil pH and nutrient content and the human resource reading.