Posted by jackinok on August 24, 2012 at 06:14:40 from (162.58.82.136):
went to a interesting meeting yesterday. dog and pony show put on by the USDA,NRCS,FSA,etc.had a interesting display setup that held trays of soil of the same depth of maybe two and a half or three inches .In them they had the top layer of ground supposedly from different fields in the local area that had grown different crops,and used different tillage practices underneath the containers,to catch water,that both went through or into the subsoil,and caught runnoff. on top of this they sprayed equaly the equivelent on two inches of rain fall. 1st tray was soil that had been cropped with no till corn with the stubble still on it.very little if any runnoff,and most of the water that didnt get soaked up by the dry stubble ran through to be caught by the supposed subsoil. it took a fairly long time for stubble to soak up but most of the water wound up underneath. 2nd tray was native grass,that supposedly had never been plowed.it actually did best in my opinion since water went through faster with very little runnoff,but was only slightly better than the no till. 3rd was bare ground supposedly full tilled and left fallow.nearly all water ran off,taking a lot of soil with it,and after the same amount of rain,they turned the tray over.water had soaked in about a inch and the bottom of the tray was absolutly dry.their reasoning being that the top sealed off as it got wet and water simply ran off the top. fourth tray was native grass pasture that had been planted in full conventional tilled ground.again there was slightly more runnoff than the no till and never tilled trays but only slightly more,and the water that went through was close to the never tilled ground. their obvious conclusion was all in favor of no till of course since thats their latest and greatest thing, but the results were sort of skewed that way in my opinion since they didnt have tilled and no till crops of the same type side by side .but overall a pretty imprssive display of how water works through the soil in various ways.watch for it if you get a chance, its pretty cool. As I say i didnt agree with all their theories and things but a good meeting none the less,and worth attending if they have one near you.
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