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1. Dramatic Soil Health Changes After 18 Years of Different Nitrogen Rates and Cropping Systems in the Northern Great PlainsRelatively few long-term cropping and nitrogen rates studies have been conducted in the semi-arid northern Great Plains that assess soil health changes. A cropping system study was initiated in 2002 in Bozeman, Montana (~400 mm annual precipitation) with wheat grown in even years, and either tilled fallow or one of the following no-till systems in odd years: fallow, wheat, pea grain, pea hay, pea green manure, and an alfalfa-grass (until 2012) followed by pea grain. N was applied at either 50%... C. Jones, P. Miller, C. Zabinski, W. Fouts |
2. In-season Nitrogen Application Method Influence on Grain Sorghum PerformanceGrain sorghum production in the United States is concentrated in the great plains. This region is prone too harsh environments that may provide opportunities for extensive N losses when relying on pre-plant N application alone. This problem may be alleviated through moving N application later in the growing season to optimize N availability when plant N uptake is most required to prevent yield loss. However, fertilizer application equipment availability may be limited for many producers in the... R.L. Sharry, B. Arnall |