Table of Contents
ISRN Agronomy
Volume 2012 (2012), Article ID 531647, 8 pages
http://dx.doi.org/10.5402/2012/531647
Research Article

Nitrogen Fertilizer Rate and Cultivar Interaction Effects on Nitrogen Recovery, Utilization Efficiency, and Agronomic Performance of Spring Barley

Alberta Agriculture and Rural Development, Field Crop Development Centre, Lacombe, AB, Canada T4L 1W8

Received 4 January 2012; Accepted 26 February 2012

Academic Editors: A. D. Arencibia, P. Soengas, B. Trognitz, and W. P. Williams

Copyright © 2012 Yadeta Anbessa and Patricia Juskiw. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A study was carried out at Lacombe, Alberta, to develop baseline information on nitrogen recovery, utilization efficiency, and agronomic performance of spring barley. This information may enable us to understand where the inefficiencies of N nutrition may lay and determine strategies to improve nitrogen use efficiency (NUE). Three divergent cultivars, “Manley” (two-rowed, tall, late maturing), “Noble” (six-rowed, mid-height, intermediate maturing), and “Tukwa” (six-rowed, semidwarf, early maturing), were grown under low (0 kg ha-1), moderate (50 kg ha-1) and high (100 kg ha-1) rates of applied N fertilization. Both N recovery and utilization efficiency decreased with the increase in rate of applied N fertilizer, and NUE declined from 45 kg kg-1N under the low N treatment to 33 kg kg-1N under the moderate treatment and 24 kg kg-1N under the high N treatment. The test cultivars were comparable in N uptake, but Tukwa and Noble were more efficient in their utilization of the N taken up than Manley, particularly under high N. Subsequently, while grain yield of Tukwa and Noble had increased linearly with rate of N fertilizer, the grain yield of Manley showed a declining trend under high N. This implies that, where a high input condition is targeted, improvement in N utilization efficiency may need to be given due consideration.