fennel wrote:My understanding is that treated lawns are an especially significant source of phosphorus run-off. Compared to agricultural lands, lawns cover far less area, but farmers tend to closely monitor their application rates – both as a matter of economics and regulation. Joe homeowner, on the other hand ...
It really depends on who you listen to. UW Soil Science Dr. Wayne Kussow is convinced that phosphorous run off is a consequence of erosion and that since turf grass reduce erosion, a well maintained, treated lawn paradoxically reduces run off.
http://www.heartland.org/publications/e ... auses.html
There is substantial evidence that most phosphorous runoff is caused by roads, malls and anywhere there is not grass.
http://www.turf.rutgers.edu/newsandeven ... soldat.pdf[/url]
Some of the folks that the county board took the recommendations from to ban phosphorous were not soil science experts but were limnologists. .
http://www.danewaters.com/pdf/20031124_ ... nopsis.pdf[/url]
snoqueen wrote: One guy actually soaked his entire lawn in Roundup not once but twice last year, believing he could get rid of all the weeds by literally killing everything on his property then starting over. The weeds came back anyway -- I think they're developing immunity.
The deal with lawns is that they are monocultures sucking out the same nutrition year after year. If the lawn is not replenished with the right balance of the Nitrogen and Potassium, other species that enjoy Nitrogen depleted soils (clover, dandilions, oxalis, chickweed) will grow until the amount of round up in the soil is so high nothing will.