Explain the meaning of these agricultural proverbs.

The first two sentences are about the season of growing wheat in rural areas, which is roughly that the solar term of Bailu is earlier and the cold dew is later. It is most suitable to grow wheat at the autumnal equinox. The second sentence also emphasizes the importance of farming season.

The last two sentences emphasize the importance of land and food. Farmers cherish land and food most, and they spend all their efforts on land and food. In rural areas, few farmers do not cherish land and food. Really, the words "cornucopia" and "gold will not be exchanged" are true. I really admire the infinite wisdom contained in the proverbs of working people!