The use of a green fallow as part of site rehabilitation measures was tested on a coastal forest soil that had been subject to accelerated erosion and on an interior forest soil that had been subjected to landing construction. In the coastal study, substantial enhancement of sight nutrient capital occurred within 5 years. The nitrogen, phosphorus, and potassium pools all benefited greatly from the green fallow. Nitrogen showed the greatest gain (890 kg/ha), primarily because of the abundance of legumes in the revegetation cover. Douglas fir seedlings responded with improved foliar N and K concentrations and a 300% increase in high growth.
In the interior study, decompacted landings were treated with broadcast applications of a legume seed mix and fertilizer. After only 2 years, the legume green fallow had improved sight nutrient capital. Once again, N showed the greatest gain (332 kg/ha) because of the presence of the legumes. Potassium and P levels improved to a lesser degree. Although seedling foliar nutrient concentration and seedling height growth had not increased, the total soil N concentration exceeded minimum levels for adequate growth of medium nutrient-requiring coniferous species. The use of a green fallow system for accelerating the recovery of forest productivity was successful in both the coastal and interior studies.
FRDA Research Report 002 (1172 KB)
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Updated July 24, 2015