JimM - 10/7/2010 07:31 My experience with sand says that the density you are sensing in the surface 4 to 6 inches is from tillage that has destablized aggregates so that when weight is applied you get a great pack. Basically a great base for a concrete pour. Tillage, or lack thereof, all impact the growth habit of the root masses of your crops and covercrops. Generally the total Dry Matter mass is the same. So what we have seen in terms of aggregate stability has most to do with the design and decomposition of the roots masses that creates AS. Just going no-till takes a long time to produce the stability. Just look at the shape of the root mass. The plant will also reuse old root channels which does not add new AS superstructure. visit us at www.soilcursebuster.com to get the rest of the story. Simple corn and bean rotation, no covers in IN and three years out and we didn't make a wheel track in standing water (following 4 inch downpour) with a 9600 full to the bin extension limits. 240+ bushels on 2 T. poultry litter and 50# N as UAN.