Article: Water is the most popular liquid ballast because it is cheap and plentiful. If you have a lot of tractor tires to fill or want to save money, water is probably your best option. Avoid using water in weather with temperatures below 32 °F (0 °C), as your liquid ballast may freeze and weigh down the tire. In cold, wintery climates, antifreeze can keep your ballast from freezing. Mix water with antifreeze in a 50/50 ratio to prevent your ballast from weighing down your tractor when temperatures drop.  Choose non-toxic antifreeze in case your ballast leaks and comes in contact with plants or animals. Antifreeze can keep liquid ballast from solidifying in temperatures down to −40 °F (−40 °C). Calcium chloride is the best liquid ballast for climates where temperatures drop as low as −50 °F (−46 °C). Mix calcium chloride flakes with water in a ratio suggested by its packaging for a cheap, freeze-resistant ballast solution. Calcium chloride is, however, more likely to rust the metal parts of tractor tires. Polyurethane foam is a common liquid ballast with a sturdy weight. Because you have to hire a mechanic to fill the tires, however, it is pricier than most ballast options. Do not attempt to fill tires with polyurethane foam yourself, as it will be more likely to leak while your tractor moves.

What is a summary?
Use water for the most inexpensive ballast option. Fill your tires with diluted antifreeze in cold weather. Try calcium chloride ballast in extreme cold temperatures. Choose polyurethane foam for an effective, yet expensive ballast option.