Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 2002-2004
Fall 2004 Fluid Journal 3 optimal corn yield and may be greater than needed for maximum profitability in many fields. Proper timing A field experiment (1988 to 1994) was conducted on a poorly drained soil at the University's Southern Research and Outreach Center at Waseca to determine the effect of time of N and N-Serve applications on corn yield, profitability, N efficiency, and N losses to subsurface drainage in a corn/ soybean rotation. Seven-year average corn grain yields were lowest with fall N without N-Serve, intermediate and equal for fall N + N- Serve and spring preplant N, and highest for split N treatment (Table 1). Apparent N recovery and economic return to the fertilizer and N-Serve were ranked in decreasing order: split N > Spring > Fall + N-Serve > Fall N. Nitrate--N losses expressed on a "per inch of drainage" basis were greatest for fall N, intermediate for split N, and lowest for fall N + N-Serve and spring preplant N (Table 1). These results clearly show yield, profitability and N efficiency advantages for the split N treatment. However, slightly more nitrate-N was lost in the drainage water from the split N treatment, due primarily to increased loss of N in the spring of the following year (soybeans), compared to the spring preplant and fall N + N-Serve treatments. These findings are contrary to common perception but are similar to other studies reported in the literature. Dr. Randall is soil scientist and professor at the Southern Research and Outreach Center at the University of Minnesota.
Fluid Journal 1999-2001
Fluid Journal 2005-2007