home    about    browse    search    latest    help 
Login | Create Account

Cultivar improvement and environmental variability in yield removed nitrogen of spring cereals and rapeseed in northern growing conditions according to a long-term dataset

Peltonen-Sainio, Pirjo and Jauhiainen, Lauri (2010) Cultivar improvement and environmental variability in yield removed nitrogen of spring cereals and rapeseed in northern growing conditions according to a long-term dataset. Agricultural and Food Science, 19 (4), pp. 341-353.

[img]
Preview
PDF - Published Version
451Kb

Online at: http://www.mtt.fi/afs/pdf/mtt-afs-v19n4p341.pdf

Summary

The balance between applied and harvested nitrogen (yield removed nitrogen, YRN %) is a recognized indicator of the risk of N leaching. In this study we monitored the genetic improvements and environmental variability as well as differences among crop species (spring cereals and rapeseed) in YRN in order to characterize changes that have occurred and environmental constraints associated with reducing N leaching into the environment. MTT long-term multi-location field experiments for spring cereals (Hordeum vulgare L., Avena sativa L. and Triticum aestivum L.), turnip rape (Brassica rapa L.), and oilseed rape (B. napus L.) were conducted in 1988–2008, covering each crop’s main production regions. Yield (kg ha-1) was recorded and grain/seed nitrogen content (Ngrain, g kg-1) analyzed. Total yield N (Nyield, kg ha-1) was determined and YRN (%) was calculated as a ratio between applied and harvested N. A mixed model was used to separate genetic and environmental effects. Year and location had marked effects on YRN and Nyield. Average early and/or late season precipitation was often most advantageous for Nyield in cereals, while in dry seasons N uptake is likely restricted and in rainy seasons N leaching is often severe. Elevated temperatures during early and/or late growth phases had more consistent, negative impacts on YRN and/or Nyield for all crops, except oilseed rape. In addition to substantial variability caused by the environment, it was evident that genetic improvements in YRN have taken place. Hence, YRN can be improved by cultivar selection and through favouring crops with high YRN such as oat in crop rotations.


EPrint Type:Journal paper
Keywords:nitrogen, growing conditions, cultivar, barley, oat, wheat, oilseed rape, turnip rape, yield, protein content
Subjects: Crop husbandry
Research affiliation: Finland > MTT Agrifood Research
ISSN:1795-1895
Related Links:http://www.mtt.fi/english
Deposited By: Koistinen, Riitta
ID Code:18180
Deposited On:28 Dec 2010 11:17
Last Modified:28 Dec 2010 11:17
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

Repository Staff Only: item control page