I haven't read this essay but imagery is quite easy to find. Imagery is usually exposed by finding explanatory words or words that make is easier to imagine the event in a story. For example, "The sun was shining a fierce red. It was a fire blazing through the sky." Sorry if I can't give you an exact answer but atleast you know what to look for. I hope this helped you.
Healthy soil helps bind particles together, improves soil structure, retains water, and improves the soil fertility resulting in higher yields for farmers.
