They are composed of marginal farmlands that were withdrawn from agriculture and consolidated under federal control beginning in the Dust Bowl.

Switchgrass has been researched as a renewable bioenergy crop since the mid-1980s, because it is a native perennial warm season grass with the ability to produce moderate to high yields on marginal farmlands.

A patchwork of tribal homelands was drawn up, often on marginal farmland, as a device to bar blacks from the cities.

Agricultural practices have changed radically since then, and marginal farmland has been taken out of production and restored to grass.

Indeed, some species of tree, such as the Fraser Fir, are unable to grow on low-quality, marginal farmland.

As the sandy soil was marginal farmland, twelve landowners took advantage the federal Soil Bank Program between the mid-1950s and early 70s.

In the 1930s, the federal Resettlement Administration bought marginal and worn-out farmland and later donated it to the state for wildlife management purposes.

Reversion of marginal farmland in the east, large scale planting in the South, and fire suppression have contributed to increases in forest area.

Goose Pond is a wetlands reclamation project south of the city, which has had some success at restoring marginal farmland to its natural condition.

Since Iceland had marginal farmland in good times, the climate change resulted in hardship for the population.