Alice and Todd looked out over their $25-$acre plot of tomatoes. No doubt about it$,$ the plants looked bad. This was their first harvest after graduating from the University of Florida and blowing all their graduation money on their local natural farm venture.

"I thought the irrigation system was all we would need. We should have majored in agriculture instead of graphic design," said Todd. $"$We set up a beautiful website, but we don't have anything to sell!"

With bills coming due and, worse yet, having to ask her parents for another loan, Alice decided to call the chair of agronomy at her alma mater to see if he could help. His secretary quickly referred her to the local agriculture extension office, where a cheerful extension agent answered the phone and agreed to drive out to the tomato farm.

Question

What are the major stresses that agricultural plants face?