root growth - penetrates the subsoil, breaks up the nutrients & allows moisture.
weeds that penetrate very deep bring up minerals from lower soils.
weeds seem to accumulate nutrients which the soil they are growing is DEFICIENT. If these weeds are incorporated into that soil, they will re-nutrify it!
Under Construction
Kitchen compost bucket - under sink model
Backyard compost bin. The black colour heats it up to speed up the composting process.