Unit production is one of the basic important stats of every colony, it determines the amount of untrained one gain every tick. There are three ways to increase your unit production:
• Train Farmers to increase your unit production.
• Level your Food Factories in the Civilian Facilities.
• Increase your Productivity. Early on you can only reach 100% Productivity, this acts as a 1.0 multiplier. But later on you can increase your Productivity beyond 100% by researching Entertainment, allowing you to go over 1.0 in the productivity multiplier. For every 0.5% happiness beyond the 100% cap, you get a 0.25% increase in the Productivity cap. For example: 100.5% happiness would allow for a Productivity of 100.25% resulting in a 1.0025 multiplier.