Symposium on Soil Ecology and Restoration August 22, 2011 Basalt Powder Restores Soil Fertility and Greatly Accelerates Tree Growth on Impoverished Tropical.

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Presentation transcript:

Symposium on Soil Ecology and Restoration August 22, 2011 Basalt Powder Restores Soil Fertility and Greatly Accelerates Tree Growth on Impoverished Tropical Soils in Panama Symposium on Soil Ecology and Restoration August 22, 2011 Basalt Powder Restores Soil Fertility and Greatly Accelerates Tree Growth on Impoverished Tropical Soils in Panama Thomas J. Goreau, Marina Goreau, Felix Lufkin, Carlos A. Arango, Gabriel Despaigne-Matchett, Gabriel Despaigne-Ceballos, Roque Solis, & Joanna Campe Thomas J. Goreau, Marina Goreau, Felix Lufkin, Carlos A. Arango, Gabriel Despaigne-Matchett, Gabriel Despaigne-Ceballos, Roque Solis, & Joanna Campe

THE SITE: PANAMA Mitigation for clearance of basalt quarry Geology: Pleistocene pyroclastic ashes, volcanic tuffs, with basalt lava outcrop Agricultural Soil Capacity: Highly infertile, not arable with severe nutrient limitations Vegetation: Secondary pioneer scrub following deforestation for pasture Precipitation: 2500 mm/yr Elevation: 600 m Mitigation for clearance of basalt quarry Geology: Pleistocene pyroclastic ashes, volcanic tuffs, with basalt lava outcrop Agricultural Soil Capacity: Highly infertile, not arable with severe nutrient limitations Vegetation: Secondary pioneer scrub following deforestation for pasture Precipitation: 2500 mm/yr Elevation: 600 m

THE TREE: ACACIA MANGIUM Planted in basalt quarry rock powder (H), local soil (L), and transition zone (M) No fertilizer added Nitrogen fixing tree Height measured by video after 19 and 59 months Soil samples analyzed Planted in basalt quarry rock powder (H), local soil (L), and transition zone (M) No fertilizer added Nitrogen fixing tree Height measured by video after 19 and 59 months Soil samples analyzed

LOCAL SOILS 19 months 59 months

TRANSITION SOILS 19 months 59 months

BASALT POWDER 19 months 59 months

TREE HEIGHT VS TIME

TREE SURVIVAL VS HEIGHT

TREE HEIGHT VS SOIL

BIOMASS VS TREE HEIGHT

BIOMASS PER TREE VS SOIL

PHOSPHORUS

IRON

ZINC

MANGANESE

POTASSIUM

MAGNESIUM

CALCIUM

ORGANIC MATTER

COPPER

pH

ALUMINUM

CONCLUSIONS Rock powders alone greatly increase plant growth and survival They provide a wide range of essential minerals as slow release fertilizers Rock weathering by roots provides a sink of atmospheric CO2 The effects could be greatly increased by addition of Biochar Rock powders alone greatly increase plant growth and survival They provide a wide range of essential minerals as slow release fertilizers Rock weathering by roots provides a sink of atmospheric CO2 The effects could be greatly increased by addition of Biochar

RECOMMENDATIONS Rock powders could be widely used as natural slow release fertilizers They can greatly aid restoration of forest and agricultural productivity in poor soils if matched to plant needs They can contribute to removal of CO2 Research is needed to optimize use of various rock powders, plants, soil types, climate regimes, and management practices Rock powders could be widely used as natural slow release fertilizers They can greatly aid restoration of forest and agricultural productivity in poor soils if matched to plant needs They can contribute to removal of CO2 Research is needed to optimize use of various rock powders, plants, soil types, climate regimes, and management practices