The word agronomy sounds like it could be derived from the same root as the word agriculture. There’s a good reason for that. It is.
Agronomy is a subset of the science of agriculture. It deals solely with the growing of field crops and with soil management. It leaves out the livestock-raising that is part of the broader category, agriculture.
In the previous entry, which was on the word agriculture, I praised the work of agriculture practitioners and scientists. I definitely intended to include the agronomy sect of agriculture in that praise. So, bravo to agronomists.