Preplant Manure and Commercial P and K Fertilizer Effects on Alfalfa Production

Abstract

Many dairy producers are being forced to consider applying manure onto their alfalfa (Medicago sativa L.) acres because of environmental concerns regarding overapplication of manure on their corn (Zea mays L.) acres. We compared the use of manure and commercial fertilizer prior to establishment on alfalfa herbage yield and nutrient concentrations. Three rates of manure (3000, 6000, and 12000 gal/acre) were broadcast and incorporated before the direct-seeding of alfalfa. Three commercial fertilizer treatments also were applied to provide P and K application rates similar to those in the manure. At all sites, establishment-year yields from the manure and fertilizer treatments were equal to, or greater (0-103%) than, the control yield. With «very high» soil P and K tests, production-year yields were similar for the manure and fertilizer treatments [...]