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Fluid Journal : Fluid Journal 2002-2004
Fall 2004 N-Use Efficiency Improves In Ecological Intensification Project Drs. T Arkebauer, A. Dobermann, K. Cassman, R. Drijber, J. Lindquist, J. Specht, D. Walters, and H. Yang Summary: Average yields approaching 80 percent of the yield potential of corn have been routinely achieved in the Ecological Intensifi cation project at the University of Nebraska in Lincoln. We have observed a trend toward improvement in nitrogen (N) use efficiency that in part is due to a gain in soil C and N storage as a result of intensive management. Closing the yield gap requires higher plant populations and improved nutrient management to maintain efficient and profi table improvement in corn production. Soil quality improvements and higher residue inputs under intensive management should make this task easier with time. Management systems designed to preserve the integrity of the environment are proving profitable in yields and more efficient use of inputs. Fluid Journal 1 A verage corn grain yields in the U.S. have increased linearly at the rate of 1.7 bu/A over the past 35 years with a national yield average of 140 bu/A. However, results of yield contest winners and data from well-designed field experiments, as well as simulation models, indicate that the actual yield potential of corn in our temperate climate exceeds 300 bu/A. Given the apparent yield gap that exists in the US Corn Belt, there are most probably significant changes in management practices that can be adopted to close this yield gap. However, there is a need to develop management systems that also preserve the integrity of the environment and that are profitable in practice. Given the lack of new agricultural lands to exploit and the ever-growing need for increased productivity on existing land, intensification strategies must be developed that improve soil nutrient supply, nutrient-use efficiency as well as soil nutrient supply. Input management Nutrient management consisted of two strategies during the period of the study (1999-2003): M1 (recommended) for a yield goal of 200 bu/A using N at 107 to 123 lbs/A for corn after soybeans and 161 to 181 lbs/A for corn aftercorn. No P or K was applied due to high soil test values. N was applied preplant and at V6 stage. M2 (intensive) for a yield goal of 300 bu/A using N at 193 to 266 lbs/A for corn after soybeans and 223 to 324 lbs/A for corn after corn. P2O5 was applied at 92 lbs/A, K2O at 93 lbs/A, and S at 10 lbs/A. N was applied preplant and at V6, V10, and VT stages.
Fluid Journal 1999-2001
Fluid Journal 2005-2007