1. "Don't ask about harvest, but ask about hard work" means as follows: Just work hard and don't worry about whether there is a harvest. As long as you keep working hard, you will have a harvest one day.
2. Don’t mean don’t want, no; ask means ask, which can be extended and translated as worry, anxiety; but means only, only; farming generally refers to farming, here it refers to one’s own harvest and gain. This comes from Zeng Guofan's wise saying: "If you are not a sage, you will be a beast; don't ask about harvest, but ask about hard work." This is the motto that Zeng Guofan followed throughout his life.