For a long subject photographed at an angle, stopping down to f/22 often isn’t enough because the plane of focus still doesn’t match the row. The community answer points to the most direct solution: use a tilt-shift lens.

By tilting the lens, you can rotate the focus plane so it aligns more closely with the length of the crop row, letting much more of the row stay sharp at once than with a normal lens. This is exactly the kind of problem tilt is designed to solve.

With your current 24–105mm lens, increasing depth of field by using a small aperture helps only to a point, and very small apertures can also reduce image sharpness due to diffraction. So if your goal is maximum sharpness across a long, angled subject for expert review and ML training, a tilt-shift lens is the best fit from the answers provided.

You would still want to test camera position, focus point, and aperture, but the key improvement is changing the focus plane, not just making depth of field larger.