Which poem does "spring ploughing, summer transportation, autumn harvest and winter storage" come from?

Xunzi? Wang Zhi pointed out: Spring ploughing, Xia Yun, autumn harvest and winter storage are all timely, so the crops are abundant and the people are full.

Interpretation: Only by respecting the law of natural planting and doing things according to the law can we succeed.

A similar statement: "On the Training of Huainan Pan Zi": "A coordinator should adapt himself to the changes of the times."