Weapons

The vegetables shows him another path

"Anything that comes out from my system should not be underestimated" he thought to himself. 

And he hoped with this sudden mass farming, he could test another one of his theories about the vegetables.

He believes that the vegetables from the system also affected the fertility of the ground. If he is right, then the ground for which the vegetables is planted would rise in its fertility. 

This is however is still only his thoughts. 

He could not prove it yet. 

And he could only find out if its true or not after a few experiments is conducted. Since he did not really have scientist in his tribe, he had to rely on himself.

He at least knows how to at least make an experiment to confirm his hypotheses. Investigate, observe and collect data

Form a hypothesis, a prediction to a possible answer to a question based on observation, existing theories and information