Chart of the week: effective height of cut and green speed

I'm using a version of this chart to start a seminar I'm teaching about clipping volume. Why green speed and effective cutting height for a seminar about above and belowground growth of the grass?

I'll explain it like this.

First, it's not how much the grass grows that we really care about. It's the surface performance, or in this case, the green speed. And it's not surprising that when the effective cutting height is shorter, the ball rolls a longer…