The invention relates to a color matching method for transforming a color representation of a first set of color primaries with a plurality of first signals to a second set of color primaries with a plurality of second signals in a first domain. The fertilizer composition may further include one or more hollow sections to allow for root penetration and efficient delivery of nutrients. The car body may include a decking or floor structure, and may include longitudinally extending side beams bordering the floor structure.