Interesting concept that could be applied more broadly than this
New Yorker article covers, even.
One way to restore degraded soil is to plant trees—lots of them. The catch is that seeds and saplings won’t grow in such soil, but if a young tree becomes large enough that its roots can reach groundwater it stands an excellent chance of thriving. Previous efforts often followed two paths: cumbersome and impractical irrigation techniques, or tossing a few million seeds out of an airplane and hoping for the best. Ruys’s innovation was to develop a doughnut-shaped waxed-paper cocoon, the base of which is buried underground. It contains the sapling, enough water to sustain the tree while it establishes a root system, and a small lozenge of beneficial fungi. The cocoon is cheap, easy to plant, scalable—a community can plant hundreds of acres of them in a short time—and biodegradable. Rubio told me that in the desert regions of Spain where his organization is working, other efforts have resulted in a success rate of ten to twenty per cent; “the cocoon,” he said, “is providing around ninety-five per cent survival rate of trees.”
Terry Calhoun
Bratsholme Farm
https://www.facebook.com/BratsholmeFarm
20 acres, previously farmed with tree lines, 36' of elevation change over 1,300 feet of south facing slope, 7,000+ trees planted so far in previously tilled acres at a density of ~500 per acre.