Moses
Genesis 9:20ESV·traditional attribution

Noah began to be a man of the soil, and he planted a vineyard.

John Calvin Reformed @genevareformer

20. And Noah began to be an husbandman . I do not so explain. the words, as if he then, for the first time, began to give his attention to the cultivation of the fields; but, (in my opinion,) Moses rather intimates, that Noah, with a collected mind, though now an old man, returned to the culture of the fields, and to his former labors.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. Noah's family and employment. The names of his sons are again mentioned (Gen 9:18, Gen 9:19) as those from whom the whole earth was overspread, by which it appears that Noah, after the flood, had no more children: all the world came from these three.

Commenting on Genesis 9:18-23

John Gill Reformed Baptist @doctorgill

And Noah began to be an husbandman,.... Or "a man of the earth" (c), not lord of it, as Jarchi, though he was, but a tiller of the earth, as he had been before the flood, and now began to be again; he returned to his old employment, and which perhaps he improved, having invented, as the Jews (d) say, instruments of husbandry; it may...