Patent ID: 7568438

Claim:
A disc furrow opener for single pass placement of seed and fertilizer, the opener comprising: a mounting arm; a disc rotatably supported on the mounting arm for pulling therewith in a forward working direction to open a furrow in the ground, including a bottom portion of the furrow that features a furrow bottom defined by a lowermost point on the disc; a scraper carried with the mounting arm on a trailing side of the disc and defining a front scraper edge positioned to scrape soil buildup from the disc, the scraper extending away from the front scraper edge at a lower end thereof disposed upward from a lowermost point on the disc to trail the front scraper edge in the forward working direction and extend away from the disc along a plane to form a seed shelf in a respective side of the furrow above the bottom portion of the furrow; a seed delivery device operable to discharge seed therefrom through a seed outlet thereon into the furrow, the seed delivery device being carried with the mounting arm with the seed outlet situated on the trailing side of the disc in a position trailing the front scraper edge of the scraper in the forward working direction to deposit the seed onto the seed shelf; and a fertilizer delivery device operable to discharge fertilizer therefrom through a fertilizer outlet thereon into the furrow, the fertilizer delivery device being carried with the mounting arm and having the fertilizer outlet situated on the trailing side of the disc and in a position trailing the front scraper edge of the scraper in the forward working direction to direct fertilizer toward the furrow bottom and into the bottom portion of the furrow below the seed shelf.