The Effect of Split Nitrogen Fertilization on Yield, Quality, and Nitrogen Use Efficiency of Spring Barley Grown on Two Different Soil Types in Iceland

Split nitrogen (N) fertilization is a strategy aimed at maximizing nitrogen use efficiency (NUE) by applying N at specific growth stages when plant utilization is greatest, thereby minimizing environmental impacts from runoff and greenhouse gas emissions. Icelandic studies on split fertilization in cereal cultivation are scarce, and the practice is uncommon amongst cereal farmers in Iceland. Consequently, little is known about the potential benefits of this strategy under Icelandic conditions. Trials were conducted at two locations in Iceland, using two different soil types and two spring barley varieties, Smyrill (six-row) and Kría (two-row), to study the effects of different N split applications on growth, grain yield, grain protein content (GPC), and NUE. Treatments included single fertilization at sowing, early booting, and/or late anthesis with different N rates for each application. Splitting N did not increase grain yield compared to a single application at sowing, but high N doses at sowing tended to increase grain yield. The effect of soil type was greater on yield and grain size. An association was found between grain size and GPC, with smaller grains giving higher GPC. The six-row variety had significantly higher GPC than the two-row variety at both locations. Single application had the highest NUE at both locations and both varieties, while 67/16.5/16.5% split resulted in the highest total N uptake and lowest unaccounted N. In a cold and wet growing season, split fertilization at early booting and/or late anthesis does not appear to have a positive effect on barley’s yield, quality, and NUE in barley cultivation in Iceland

Author dc:creator

• Sunna Skeggjadóttir 1999-

Contributors dc:contributor

• Landbúnaðarháskóli Íslands

• Bygg
• Skipt köfnunarefnis áburðargjöf
• Nitur
• Vaxtarstig
• Uppskeruþættir
• Prótín
• Niturnýtni

Language dc:language.iso

en

Handle dc:identifier.uri

https://hdl.handle.net/1946/53363

OAI identifier oai:identifier

oai:skemman.is:1946/53363