Ok I found that and found TileYieldGrain <modifier>1.5 changed to 2 but I have notice that most don't have TileYieldMaterial.  I am wondering if I should add this to the terrain types that have Grain yield. ie,

<GameModifier InternalName="CityTileYield_Fertile">

<ModType>Resource</ModType>    

<Attribute>TileYieldGrain</Attribute>     

<Value>2</Value>      

<PerTurn>1</PerTurn>  

</GameModifier>

ADDING This below the above:

<GameModifier InternalName="CityTileYield_Fertile">

<ModType>Resource</ModType>   

<Attribute>TileYieldMaterial</Attribute>    

<Value>2</Value>      

<PerTurn>1</PerTurn> 

</GameModifier>

Think that will work?

Funny you should say experiment. LOL.

I just did. I recommend only modding the LAND terrain.

I was able to get a general increase over all.

New game with YIELD values at 2 on LAND terrain gave me 5 grain/4 Material and 4/4 with the majority being 5/3 or 4/3 but I succeeded in getting a slight boost to base materials which was my goal without Overpowering it.

I will keep you posted on how it progress over several game starts.

Ok cool, I can get a fairly consistant and spread out 5-4, 5-3, 4-4 and 4-3 grain/material ratio. So looks like this is a win. Oh and I managed to get Clay to show up fairly regularly too. All things considered it is a good MODDING Day.

I ended up lowering the value from 2 back to 1.5 to even things out a bit more and still keep a challenge; seems to be working out.