My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in AJ

  1. Vol. 93 No. 4, p. 836-841
     
    Received: Sept 15, 2000
    Published: July, 2001


    * Corresponding author(s): adhalvor@lamar.colostate.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj2001.934836x

Tillage and Nitrogen Fertilization Influence Grain and Soil Nitrogen in an Annual Cropping System

  1. Ardell D. Halvorson *a,
  2. Brian J. Wienholdb and
  3. Alfred L. Blackc
  1. a USDA-ARS, P.O. Box E, Fort Collins, CO 80522
    b USDA-ARS, 119 Keim Hall, East Campus, Univ. of Nebraska, Lincoln, NE 68583
    c USDA-ARS, 226 E. Circle Dr., Canon City, CO 81212

Abstract

Increasing the frequency of cropping in dryland systems in the northern Great Plains requires the application of N fertilizer to maintain optimum crop yields. A 12-yr annual cropping rotation [spring wheat (Triticum aestivum L.)–winter wheat–sunflower (Helianthus annuus L.)] under dryland conditions was monitored to determine the influence of tillage system [conventional till (CT), minimum till (MT), and no till (NT)] and N fertilizer rate (34, 67, and 101 kg N ha−1) on N removed in grain and annual changes in postharvest soil NO3–N. Nitrogen removal in the grain increased with increasing N rate in most years. Total grain N removal was lowest with NT at the lowest N rate and highest with NT at the highest N rate compared with CT. Total grain N removal after 12 cropping seasons was 144, 84, and 61% of the total N applied for the 34, 67, and 101 kg N ha−1 fertilizer rates, respectively. Residual soil NO3–N levels were not affected by N rate or tillage system in the first 3 yr, but they increased significantly following consecutive drought years. Residual NO3–N in the 150-cm soil profile tended to be higher with CT and MT than with NT. Soil NO3–N movement below the crop root zone may have occurred in 1 or 2 yr when precipitation was above average. Results indicate that NT, with annual cropping, may reduce the quantity of residual soil NO3–N available for leaching compared with MT and CT systems.

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

Copyright © 2001. American Society of AgronomyPublished in Agron. J.93:836–841.