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Managing Farming Systems for Nitrate Control

A Research Review from Management Systems Evaluation Areas

^a Research Soil Scientist, USDA-ARS (retired)
^b Professor (retired), Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583
^c Agronomist, Pioneer International, (retired)

View larger version (18K): [in a new window]   Fig. 1. Average nitrogen concentration below the root zone comparing nitrogen fertilizer placement in the shoulder and in the furrow of a ridge-till system (Dolan et al., 1993).

View larger version (121K): [in a new window]   Fig. 2. Relative grain yields for 60 cells in each of five 1.7-ha fields from 1991 to 1995 at Princeton, MN (Lamb et al., 1997).