Okay, totally a newbee question, but I'm interested in no till methods, but I've been reading that besides man-made soil compaction, there can also be a natural soil compaction layer somewhere in the 14-18 inch range or depth. True or False? and if there is this layer, do you do an initial tilling to break through it? Leave it be? Break through some other way (planting strong deep rooting plants, encouraging night crawlers, or anything else)?