Residual soil nitrogen credits for corn production along the upper Texas Gulf Coast region | Academic Article individual record
abstract

© 2016 Taylor & Francis Group, LLC. Studies were conducted to evaluate response of dryland corn (Zea mays L.) along the upper Texas Gulf Coast to residual soil nitrate-nitrogen (NO3-N) measured to depths of 15, 30, and 61 cm. Residual soil NO3-N levels ranged from 3.4 to 31.6, 7.8 to 49.3, and 9.0 to 71.7 kg ha−1, respectively, in 0 to 15, 15 to 30, and 30 to 61 cm depth increments, with cumulative NO3-N ranging from 23.5 to 114.5 kg ha−1 across sites-years. Where N fertilizer was reduced due to N crediting, yields and bushel weights at all 13 site-years showed no difference from those receiving full recommended N rates. A yield response to any level of added fertilizer N above the control was observed for only 6 of 13 site-years. These results indicate a high potential for success in crediting carryover soil NO3-N to 61 cm as a means of reducing applied nitrogen fertilizer rates.

author list (cited authors)
Fromme, D. D., Coker, D. L., McFarland, M. L., Mowrer, J. E., Provin, T. L., Schnell, R. W., & Grichar, W. J.
publication date
2017
publisher
published in
keywords
  • Yield Goal
  • Residual Nitrogen
  • Soil Testing
  • Soil Profile
  • Nitrate
  • Corn