We have two words here: "cultivate" & "till". This is the same word in the Hebrew: "Abad" Adam was the first to cultivate and till the ground. Although God planted the Garden. Adam tilled the ground and cultivated the plants that God provided for him. The plough represents one of the major advances in
agriculture.
Genesis 2:15 Then the LORD God took the man and put him into the garden of Eden to
cultivate it and keep it.
Genesis 3:23 therefore the LORD God sent him out from the garden of Eden, to
cultivate the ground from which he was taken
Genesis 4:2 Again, she gave birth to his brother Abel. And Abel was a keeper of flocks, but
Cain was a tiller of the ground.
Genesis 3:17-19
Then to Adam He said, "Because you have listened to the voice of your wife, and have eaten from the tree about which I commanded you, saying, 'You shall not eat from it'; Cursed is the ground because of you;
In toil you will eat of it All the days of your life. "Both thorns and thistles it shall grow for you; And you will eat the plants of the field; By the sweat of your face You will eat bread, Till you return to the ground, Because from it you were taken; For you are dust, And to dust you shall return."
We know Adam lived 6,000 years ago. Farming was actually progressive over time. They would collect their seeds and throw them out in the mud in the spring. Something new began with Adam. Science calls this the agricultural revolution or the Neolithic Revolution. By the late stone age the stone tools were fairly effective, then metal farming tools were developed. The transition from the stone age to the bronze age was in Mesopotamia where Adam lived when Adam lived there.
Is there someone else living in the same place Adam lived at the same time that Adam lived that you would like to propose as the first person to till the land? Of course when you till the land you can keep flocks because you can feed them. This is the beginning of cities and the beginning of civilization.