[costcopizza]

Note he said better rather than increase.

Better could mean anything from maintaining current output with less costs to increasing the quality of your crop.

[weberc2]

The phrase "better yields" is exactly synonymous with "increased yields". A crop's yield is its volume, measured in bushels. There is literally no other way to interpret this.

Citation: I grew up on a farm, and my family has farmed for at least 200 years.

EDIT: This is a particularly weird reason to downvote me...

[JoeAltmaier]

And that'd be pedantic. Better can be more cost-effective, cheaper in time or money or equipment or quality of land required. I grew up on a farm, live on one now, my family has farmed for 300 years, so I guess I win?

[weberc2]

You seem to think you're disagreeing with me, but everything you said is consistent with my description.