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Soil Science Society of America Journal Abstract -

Nitrogen Source, Rate, and Application Method for No-Tillage Corn

 

This article in SSSAJ

  1. Vol. 53 No. 5, p. 1573-1577
     
    Received: Aug 8, 1988


    * Corresponding author(s):
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doi:10.2136/sssaj1989.03615995005300050046x
  1. Donald D. Howard  and
  2. Donald D. Tyler
  1. Dep. of Plant and Soil Sci., Univ. of Tenn., West Tenn. Exp. Stn., Jackson, TN 38301

Abstract

Abstract

Surface applying urea-containing N fertilizers may result in greater N losses by volatilization of NH3 as urea hydrolyses than nonurea containing materials. The objective of this study was to evaluate the N efficiency of urea-ammonium nitrate (UAN), urea and urea-urea phosphate (UUP) at 56, 112, 168, and 224 kg ha−1 N rates applied broadcast, surface banded, and injected for no-till corn (Zea mays L.). Yield, ear-leaf N concentration, and N uptake were used to estimate N availability. Broadcast ammonium nitrate (AN) and injected anhydrous ammonia (AA) were used as controls for evaluating N efficiency of urea-containing N sources and their application methods. The method of applying the urea-containing N sources has a significant effect on apparent N fertilizer availability. Injecting UAN and urea resulted in significantly higher yield, leaf N concentration, and N uptake when compared with broadcast and surface band application methods. Surface banding UAN at 168 and 224 kg ha−1 resulted in higher yields than urea or UUP. Yield, leaf N concentration and N uptake differences among the three urea-containing N sources were not observed when broadcast applied. Broadcasting AN at 168 and 224 kg ha−1 resulted in higher yields than UAN, urea or UUP. Injecting the N sources resulted in higher yields when compared with broadcasting AN.

Research partially supported from funds provided by Fluid Fert. Found. and TVA.

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