context1: A database of unit conversion factors also ships with TK Solver, and users can add, delete, or import unit conversions in a way similar to that for rules. Each variable is associated with a calculation unit, but variables can also be assigned display units and TK automatically converts the values. For example, rules may be based upon <strong>meters</strong> and kilograms, but units of <strong>inches</strong> and pounds can be used for input and output.
context2: With strip-tillage systems more precision is needed. The farmer will work the ground with a specialized implement to till up an eight to ten <strong>inch</strong> row and at the same time incorporate the fertilizer or chemical that the farmer so chooses. If the applicator’s chemical or fertilizer <strong>meter</strong> is off slightly, the farmer will not be applying an accurate rate of the chemical.