An Automatic Soil Testing Machine for Accurate Fertilization

The work aims to propose a research and development project to prepare a device that can test sample of soil from the field and the testing sample will give suggestion about required amount of fertilizer. The device will work as a datasheet for the users. In the soil sample, the proposed device will measure the level of different nutrients in the soil NPK (nitrogen, phosphorus and potassium) values using the Beer's law method. An Arduino is used for microcontroller. Different light colors are used to light up watery soil solution under testing. Light gets bounce back from solution. It depends upon its absorbent reflectance of soil. Reflected light is received by another Light Depending Resistor (LDR) which is converted into electrical signal. With the help of Microcontroller, the proposed device can measure soil nutrients. It will be helpful for the farmers to cultivate in a smart way to get more quality products.