About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in AJ

  1. Vol. 76 No. 2, p. 280-283
     
    Received: June 16, 1983


 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2134/agronj1984.00021962007600020025x

Water Table Depth Interaction with Nitrogen Rates on Subirrigated Corn1

  1. J. R. Woodruff,
  2. J. T. Ligon and
  3. B. R. Smith2

Abstract

Abstract

Water table control for both drainage and subirrigation holds potential benefit to crop production on many soils with imperfect drainage. Losses of soil NO-3-N may occur through denitrification under partial anaerobic conditions such as would be encountered near a water table. In this 3-year field study, four N rates were superimposed over three water table depths to test the effect of water table depth on corn (Zea mays L.) response to N in a Chewacla silt loam (fine-loamy, mixed, thermic Fluvaquentic Dystrochrepts). Water table depths were 0.35,0.70, and 1.00 m and N rates were 0,112,224, and 336 kg ha−1. The effects of N fertilization depended on the water table depth. For the 3-year means, quadratic regressions described the relationship between N rate and ear yield or leaf N for each water table depth except 1.00 m ear yield for which no response to N fertilizer was obtained. The N rate required for maximum ear yield or leaf N increased with decreasing water table depth. There were positive linear regressions of stover yields and soil NO-3-N on N rate for each water table depth. With the 1.00 m water table, the N response slope was less for stover yield and greater for soil NO-3-N than over the shallower water table depths. The lowest ear and stover yields were associated with deficient leaf N concentrations (< 27.5 g kg−1) where no N was added over the 0.35 and 0.70 m wafer table depths. The results suggest that soils with water tables within 0.70 m depth require more N fertilization to reach maximum corn yields than soils with deeper water tables.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .