The chart is for one gallon of water that weighs approximately 8 pounds per gallon. Water is not a typical tire filler. Methonal alcohol is a more common filler and weighs 6.5 pounds. Methonal alcohol is a more common filler and weighs 6.5 pounds per gallon.
Other fillers such as Calcium, Beat Juice, etc. can have different weights. For example, buoyancy, a specific feature of VF tires, will no longer be possible if the tires are filled with water. Unscrew the valve core and then connect one end of a tire hose to the core and another end to a water source, such as your home's water supply.
While one of the most common liquid ballasts for filling a tire is water, you can also use antifreeze, calcium chloride, or polyurethane foam to fill tires. Filling your tractor tires with water is a great way to maintain their pressure and increase traction. VF technology is designed to offer greater traction capacity and prevent tires from slipping, without the use of water.