Corn Response to Nitrogen-Loss Additives


  • Compare long-term agronomic and economic response from using nitrogen (N)-loss additives for corn.

Study Description

Plot Layout:        6-row randomized small plots
Replicates: 4 per location
Locations: Brookings, SD; Beresford, SD
Map: research locations
Hybrids: DKC 4551 (Brookings)
Pioneer® hybrid P9917 (Beresford)
  • N Rates:
  • 0, 40, 80, 120, 160 and 200 lb N/acre as urea (200 rate at Beresford only)
  • N Additives:    
  • None
    Volatilization inhibitor
    Volatilization inhibitor + nitrification inhibitor
    *N additives were compared at the 80 lb N/acre rate (also at 40 lb N/acre rate at Beresford).

    Additional Study Notes

    • Tillage - Brookings (tilled), Beresford (no-till)
    • Timing - Treatments were applied on surface just before planting.
    • Other nutrients applied as needed.
    • Soil samples taken before planting and after harvest.
    • Significance considered at < or = to 0.10.


    Chart: Nitrogen Rate Effect on Corn Grain Yield
    • Corn yield significantly increased with N rate at Brookings.
    • N additives did not significantly increase yield at the 80 lbs N/acre urea rate although these yields trended higher by 5-8 bu/acre (data not shown).
    • SPAD meter readings at V8 significantly increased with N rate and followed the yield curve (data not shown).
    Chart: Nitrogen Rate Effect on Corn Grain Yield
    • Corn yield significantly increased with N rate at Beresford up to about 80 lbs N/acre.
    • N additives did not significantly increase yields over urea alone at either the 40 lbs N/acre or 80 lbs N/acre rates (data not shown).
    • SPAD meter readings at V10 were significantly increased by N rate up to the 80 lb/acre N rate (data not shown).

    Research conducted by Ron Gelderman, South Dakota State University Extension, as a part of the Pioneer Crop Management Research Awards (CMRA) Program. This program provides funds for agronomic and precision farming studies by university and USDA cooperators throughout North America. The awards extend for up to 4 years and address crop management information needs of Pioneer agronomists, Pioneer sales professionals and customers.

    2013 data are based on average of all comparisons made in 2 locations through November 22, 2013. Multi-year and multi-location is a better predictor of future performance. Do not use these or any other data from a limited number of trials as a significant factor in product selection. Product responses are variable and subject to a variety of environmental, disease, and pest pressures. Individual results may vary.

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