Why tillage is important?

Tilling is deep ploughing the land almost to the depth of 8-10 inches while preparing the soil for cultivation. When the soil condition is very poor, then a large quantity of organic matter has to be incorporated into it and this can be done only by tilling this soil. Other important reasons for tilling the soil could be facilitating air circulation, decomposition etc. tilling can be done in many ways and is expected to have its own advantages and disadvantages.