Kernels must be dried within one to two days of harvesting. Farmers transport the kernels on large vehicles, such as semitrailer trucks, to nearby drying facilities, which might be owned by rice farmer cooperatives such as Producers Rice Mill and Riceland Foods or such commercial mills as Riviana Foods. Machines blow warm air across the kernels in several stages until the moisture content is about 12.5 percent, which is suitable for storage. Drying too quickly will cause the grain to crack and break apart during milling; broken kernels are removed after milling, as these kernels do not process the same as whole kernels and degrade the appearance of samples. Drying takes two to three days in commercial driers but can take up to weeks in on-farm, bin driers.