<http://schema.org/description>
"High salt levels in soils can affect plant yield and cause salt injury including burnt leaf margins and stunted plants. In the field, saline soils are not common in Pennsylvania. But plastic high tunnels keep the rain from flushing nutrients and salts out of the root zone. Extension Educators tested soils in six high tunnels across the state this summer and found three with soil salinity high enough to affect crops."^^<http://www.w3.org/2001/XMLSchema#string>
<http://extension.psu.edu/plants/vegetable-fruit/news/2011/are-salts-affecting-your-high-tunnel-crops-on-farm-demonstration-update>