Green fencing

The image below of a portion of our farm, from google maps, shows fencing helps regenerate soil fertility.

The three light colored spots directly to the left and
below the hexagon are fruit trees, and two brown spots
near the lower right edge of the photo are Japanese Maples.

In the photo the small hexagon in the upper left corner, 750 square feet in area, is markedly greener than the rest of the field. It was fenced off. The rest of the acreage is open to any critter. This photo was taken in the late, dry, summer of 2014.

We watered the trees, but we also watered trees in other areas that do not show similar increases in greenness. It appears that the fencing ended grazing pressure from rabbits, turkey, and deer. The longer grass, bushes and trees shade the soil, keeping it cooler and more moist, setting up a soil creation feedback system--more protection more green, more green more protection, etc...

We have since added considerably to this fenced area, now up to over 10,000 sf. This photo makes me want to fence my entire five acres.