The soils which are haiving high C:N ratio will be beneficial for agriculture or not. Here i want to know the what is the ideal C:N ratio of the soils for better crop growth & yields.
Different crops can grown in different soil. Some thrive better when stressed. That said, in general the balancing of Carbon and beneficial soil microbes to achieve an ideal Carbon to Nitrogen ratio of 24 : 1 has been generally considered good. This increases the organic matter and creates an environment of high productivity. I would though focus on whatever crop you are studying and different plans thrive in different environments and stress.
Additionally, I also found this link that summarized some discussion of C:N ratio and its impact on soil.
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/carbon-to-nitrogen-ratio