Action: Add lime to the soil to increase fertility
- One replicated, randomized controlled study in the USA found that adding lime increased vegetation cover.
Application of lime (rich in calcium and Magnesium) is used to neutralize soil acidity, and increases activity of soil bacteria. This may increase soil fertility and as a result enhance biodiversity in degraded forest areas.
Supporting evidence from individual studies
A replicated, randomized, controlled study in 1991-1995 in a degraded temperate coniferous forest in Idaho, USA (Walsh & Redente 2011) found that adding lime to the soil before restoration planting increased total plant cover. Total plant cover was higher in lime addition (38-40%) than control plots (17-23%). Control and lime addition treatments (at 11,000 kg/ha ) were each applied in 1991 to eight plots (3 × 10 m) at each of two hilltop sites. All plots were fertilized with nitrogen, phosphorus and potassium at 112, 56 and 90 kg/ha respectively. Plots were planted with western white pine Pinus monticola trees, shrubs and grasses before treatments in 1991. Data were collected in 1995.