Started a game as Morgan. Developed weather paradigm to get boreholes etc.

But: Most of my improved tiles yield no more than 2 resources. Buit a borehole and its 2 energy and 2 minerals, with large black areas behind the resources. What am I not getting?

There is a resource limitation of 2 per field per type, which will be lifted once you research the correct technology
- nutrients: Gene Splicing
- energy: Environmental Economics
- minerals: Ecological Engineering