Question

why is tilling important for cultivation of crop​

Answer 1

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The turning over of the soil helps to loosen the dirt making it easier to plant new seeds. Tilling is also an effective form of weed control. The roots of weeds are just waiting to sprout along with the crops. Tilling also aerates the soil, which many believe is beneficial to crop growth.
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Answer 2

Air pockets that are created by the deep loosening of soil facilitate air and water penetration for plants to use. Air penetration is also important to the micro-organisms in the soil that perform all kinds of important tasks creating nutrients for the plant.
This provide aeration to plants roots, and nutrifying bacteria which convert atmospheric nitrogen to such a form that plants can absorb