New paper written using soil measurements, stream composition, etc. I guess if the entire billion isn't on your field we can continue on. A 100.00 here? a 100.00 there. Looks like it all adds up.
I have a terrible time with uploading links here. Here is an attempt, articles are found in The New York Times, Des Moines Register, and the Cornell University News. Here is an attempt. WWW.nytimes.com/2011/05/05/opinions/05+. You have to search under the archive banner. Or search " Iowa topsoil" to find multiple links.
I'm sure you're already doing this but just in case;
find the page you wish to link
at the top of the page is the web address for that page
left click on the web address to highlight the web address
then, once it's highlighted right click on the highlighted area---click "copy"
then, right click inside the uph post box where you wish to paste the link--click "paste"