The phrase "a fruitful source of" is correct and usable in written English.
It can be used to describe something that provides valuable or beneficial information, ideas, or resources.
Example: "The research project proved to be a fruitful source of innovative solutions for the community."
Alternatives: "a valuable source of" or "a rich source of".
There are left three classes of bank borrowers: (a) Small or privately owned enterprises maybe good, maybe not; (b) Large industrial corporations with poor records even in the late prosperity; (c) Railroads and utilities needing temporary accommodation, to be paid off by permanent financing–a fruitful source of trouble for all concerned.
It should prove a fruitful source of revenue.
Forensic statistical research has been a fruitful source of leads in other sports.
He thought of the evenings as amusement – enjoyable, pointless and a fruitful source of the dismissive jokes which he made, with relish, to his more politically engaged friends.
But Andersen, which said it was not consulted about the accounting in question, is hardly a fruitful source of potential recovery for any damages.
But as a guide to the works that middle-class Americans read, it is a fruitful source of hypotheses and a healthy check on subjective opinion.
Nigerian television has been a fruitful source for the recovery of missing episodes, as a total of 15 out of the 50 episodes recovered since 1978 have been obtained from Nigeria, which has led to three serials (The Time Meddler, The War Machines, and The Enemy of the World) once again being complete in the BBC Library.
In addition to its potential as a fruitful source for understanding the mathematical subtleties of the models from a new perspective, this analytical description also allows us to fully utilize the Newton Raphson algorithm in numerical simulations, which by design should lead to reduced computational effort.
The data collected from each of the production and customer divisions can be a fruitful source for failure analysis.
Designed for the purposes of human resource analysts and advisers, the database has nevertheless become a fruitful source for researchers trying to understand labour markets, and research users now have a stake in its ongoing development (National Research Council 2010).
Frost, for example, was hacked at least twice daily by Evans because, like Yentob, she was deemed a particularly fruitful source of stories and was on his so-called "back pocket list" of targets.
