I was reading my gardening book about growing green manure to add nutrients to the soil.. and it got me thinking:
Green manure takes nutrients from the soil in order to grow. Does it add back more than it's taken?
Typically I just mulch my garden with newspapers/grass clippings each fall before the rains, then uncover my growing areas in the spring as needed.
I realize there are other reasons for growing green manure, such as soil preservation, etc. But does it really add any nutrients?