Home Products planter parts yetter fertilizer coulter parts knives knives 2 Available Products SALE FC1902 - Liquid Fertilizer Knife For Yetter 2990, 2995 series with 17" or 17-5/8" blades. ... SALE FC1903 - Dry Fertilizer Knife For Yetter 2990, 2995 series with 17" or 17-5/8" blades. ... 2 Available Products