It appears that (compared to all previous versions) the 25% gold bonus does NOT apply to resources produced in oases. In Travian Kingdoms, the gold cost of 25% has gone up but the impact has gone down (significantly) if it does not apply to resources generated by oases, especially in capitals.
It is also misleading in the Gold section:
"The **25% bonus does not only apply to the base production of the resource, but it does apply to all other bonuses!"
This implies that the 25% bonus applies to everything. If it does not apply to oases, then this should be re-worded, or should explicitly say that it does not include oasis production.