Gardening Question

dmd77
Fri, 15 Apr 2005 22:44:11 +0000

The Roundup in the study on amphibians was applied directly to the pond.

From this source: http://www.ext.colostate.edu/pubs/crops/00562.html

“Organic phosphorus (Roundup, Touchdown, Ignite). These herbicides exhibit high acidity, very high water solubility and very low volatility. They readily react with clay and metal oxides in soils to form insoluble iron, aluminum and calcium precipitates. As a result, they have very high soil retention. Soil mobility is very low. Persistence is very short due to the formation of insoluble precipitates, making them biologically inactive upon contact with mineral soils.”

So, it would appear that Roundup applied directly to soil is relatively safe, if used infrequently and in small amounts on plants and not into water.

You east PA people: do you go to Longwood Gardens? My favorite gardens!