Why don't you enhance your understanding by, for example, reading the article?
Soil depletion is mentioned, among other things. But it isn't so much a deficiency of nutrients as a disruption of the uptake of those nutrients.
Water is only mentioned in the context of less water being drawn into the plants.
It's left to the reader to guess what you mean by "chemically treat plants[...]" but FWIW the main culprit is selective breeding, not any chemical intervention.
Soil depletion is mentioned, among other things. But it isn't so much a deficiency of nutrients as a disruption of the uptake of those nutrients.
Water is only mentioned in the context of less water being drawn into the plants.
It's left to the reader to guess what you mean by "chemically treat plants[...]" but FWIW the main culprit is selective breeding, not any chemical intervention.