USA FIELD POLLUTION PROBE – GYPSUM EASES SOIL RUN-OFF
July 1st, 2006
BY MONICA DOBIE
SCIENTISTS from the USA Agricultural Research Service (ARS) have determined that the mineral gypsum is a very effective soil additive for curbing run-off of phosphorus from farm fields into water supplies.
The study compared gypsum, alum and ground-up wastepaper at keeping phosphorus from leaching from farmland. Testing was undertaken on land that had received manure applications from dairy and egg-laying food producers for more than 40 years. The researchers mixed rival materials into the soil annually for three years. They found that applying ...
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