Question: query regarding soil testing.
Answer:  remove the upper surface debris from the soil and insert aspade or trowel ```up to a depth of 20-30 cm and take several core sample randomly (about 10-15 samples should be take). almost 1 kg of soil should be collected. after collection mixed your samples in a clean polythene bag or container and submit it to krishi vigyan kendra of your respective district. 
 before collection please contact once with the principal scientist of your krishi vigyan kendra.