A system and method for distributing multiple types of seed, fertilizer or other materials from an agricultural vehicle is disclosed. The tubular outer shaft includes an axis and a distal end region. The modifier component may in some embodiments be an ethylene -olefin copolymer with a density0. 12 times, to thereby acquire change amount data \u0394Q corresponding to the activity Nactj generated by the activity computing circuit. The electronic content guide can also include a second content field, displayable in a column parallel to the source field and the first content field, corresponding to a second content data. A voltage may be applied between a first electrode and a second electrode.