Crop is one of the most important resources in Travian: Legends. Many early difficulties come from managing crop production, because buildings, fields, and troops all consume crop every hour.
You can see crop consumption clearly in building requirements. For example, a level 1 woodcutter consumes 2 crop per hour. All crop consumption from population and troops is cumulative.
Your current resource storage and free crop are shown at the top of the screen.

To improve your crop production, you can upgrade:
Croplands
Grain Mill
Bakery
Keep in mind that level 1 cropland requires 20 crop to construct.
Negative Crop Production
If your population and troops consume more crop than you produce, your crop balance becomes negative.
When this happens:
Your granary will begin to empty.
If the stored crop reaches 0, troops will slowly starve and die.
Starvation stops once the crop production reaches 0 again.
You can view detailed crop usage by clicking the crop balance icon in the top bar.
Free Crop
Free crop is your crop production minus your total population.
Free crop includes:
Oasis bonuses
Grain Mill and Bakery bonuses
Free crop does not include:
Hero production bonus
Plus account crop bonus
Normally, buildings or upgrades that would reduce free crop below 1 cannot be started.
However, there are important exceptions.
Limitations and Exceptions
You can always:
Upgrade a cropland
Build or upgrade a Grain Mill or Bakery if the upgrade increases free crop
Build a Main Building level 1
You can also build or upgrade the following to level 10, regardless of free crop, if your base crop production in the village is 276 per hour or more:
Main Building
Warehouse
Granary
World Wonders are always exempt and may be upgraded regardless of crop.
You cannot destroy a Grain Mill or Bakery if doing so would reduce free crop below 1.
Hero Crop Production
Your hero always produces 6 crop per hour, no matter how skill points are allocated.
Important rules:
Hero crop production is added to the village the hero belongs to.
This production does not increase free crop.
A dead hero continues to produce 6 crop per hour.
When revived, hero resource production and hero crop consumption begin at the same time.