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Reducing over-winter nitrogen loss

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Abstract
  • Nitrogen can be lost when the quantity of available nitrogen exceeds crop demand or nitrogen availability is not in synchrony with crop demand. Either situation results in accumulation of available nitrogen, primarily in the nitrate form, at the end of the growing season. Over-winter nitrogen loss occurs primarily as nitrate- N is leached below the root zone. The remedy to N loss is obvious; don’t allow nitrate-N to remain in soil after harvest. Matching crop use to N supply so that little if any NO3-N remains in the soil after harvest is difficult. One step toward low residual NO3-N is synchrony of application and crop use. If crop use is known, application time can precede use. References are provided for seasonal and daily crop N uptake of 25 crops. The list of crops grown in the western United States is many times this number and a data for a crop of interest to advisors and consultants is logically not available. If crop N use is not available, methodology for collecting data and constructing uptake graphs is provided.
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  • Hart, J., D. Horneck, D. Sullivan and N. Christensen. 2005. Reducing over-winter nitrogen loss. p. 14-19. In: Proc. Western Nutrient Management Conference (Vol. 6), Salt Lake City, UT.
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  • Salt Lake City, Utah, USA
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