Good Soil Structure
Residues that are allowed to rot on the soil surface are incorporated into the soil by soil fauna as soil organic matter (SOM)
Soil organic matter
SOM is the feed-stuff of millions of beneficial soil microbes that build soil structure. Good soil structure positively influences crop yield and halts soil erosion, but is otherwise destroyed by all forms of tillage (there are no exceptions).
Tillage discharges large quantities of CO2 into the atmosphere through aeration. No-tillage greatly reduces this. The less the disturbance the less the CO2 discharge. Cross Slot openers achieve the least disturbance of all.
Only now are soil biologists realising that tillage has been distorting the soil biological eco-system for centuries and that new levels of crop yield may be attainable under continuous low-disturbance no-tillage.