Soil
"We are exhausting the quality of our soils. As we do so, the quality of our plants goes down. And we are accepting this."
A quote from William A. Albrecht PhD and as apt today as it was when he said it.
"Dr Albrecht was a scientist whose extensive experiments with growing plants and animals substantiated his theory and observation that a declining soil fertility, due to a lack of organic material, major elements and trace minerals - or a marked imbalance in these nutrients - was responsible for poor crops and in turn for pathological conditions in animals fed deficient feeds from such soils. Obviously, mankind is no exception." A quote from the introduction written by Dr Granville Knight, MD.
This is a must read for every farmer, gardener, soil scientist, ecologist and anyone with an interest in food, health & illness. Even though some of the science may be beyond the likes of me, there are still accessible parts that are well worth the effort.
An informative, interesting and essential but depressing book:
The Albrecht Papers Volume 1 Foundation Concepts