2.4. Smartphone Specification

The testing technique is built around a smartphone running the Android operating system. Phones marketed by three different smartphone makers were used. Their specifications are as follows:
a) Phone A - Asus Zenfone (Model Number: Asus-Z007) with android version of 4.4.2 available at cost of INR 6,299;
b) Phone B - Moto G with (Model Number: Moto G, 2nd Generationwith 4GLTE) with android version of 6.0 available at cost of INR 10,499
c) Phone C - Samsung on Pro 5 (Model Number: SM-G550FY) with android version of 6.0.1 available at cost of INR 9,190.
They represent different capabilities with the camera, flash and processors. The phones selected are popular models in the Indian market and represent the middle range of phones available in the market presently.

2.5. Software
2.6. Field sample collection

As shown in figure 2, soil samples are collected using soil probe purchased from La Motte. For perticular field of 1 acres, 5 different samples from different area of the field are taken using soil probe and mixed them together to get uniform sample.  All soil samples are collected from Agriculture University of Pune.