Farming. How is efficiency calculated?

[Mourn]

I am struggling with my farming efficiency.
I am not sure if multiple farm/kale buildings interfere with each other.
Do I need to switch farms from Wheat to the other crop?
I can not seem to find any farms in the other map areas to help.
I seem to be able to produce/manage all my other resources but wheat and farm related stuff is so poor, because efficiency drops fast.
I do see the wheat icons on the map will help but that's all I can see.
Anyone have any tips?

[Shroom]

According to my measurements, it does not depend at all.
those. you can place 2 farms close to each other and if they find the same amount of wheat bubbles in the zone, they will have the same productivity (the same as if you placed only one farm)

[Shroom]

Simply put - build up areas with wheat bubbles as densely as possible - this is the only option to achieve maximum productivity

[Sgt.Ray]

Yeah the green haze on the map layer doesn't mean $hit. Just go look for the wheat bubbles and place as many in the building radius as possible.

[EnemigoDeLaMafia]

As it has been said, you need bubbles. Those bubble are concentrated on the green areas, so before building big make sure to check where those are by using the fertility overlay. You don't want to put all your industry on your farmland.

Eventually you can get greenhouses to replace the kaleyard. Greenhouses do not need land fertility, so all that land will need to go towards your farms which cannot run during winter and require farmland to be worth anything.