The name ‘Yara’ represents a good harvest and a good year
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Over the last 4 years Yara have carried out replicated small plot Nitrogen dose response trials on winter wheat. These have been conducted on a wide range of soil types, in different areas of England and with varying SNS levels.
This work includes 70 trials trials, the result of which can be seen below. The trials were carried out on soils with varying SNS levels with measured soil mineral nitrogen in February ranging from around 20 kgN/ha upt to over 200 kgN/ha. The resulting curve shows a good response to nitrogen up to nearly 300 kgN/ha.
This work, along with other dose response work carried out on wheat back to the late 1980's has been anlaysed to look at the impact of changing the breakeven ratio (BER) on the optimum nitrogen rate (N Opt). The results show that on average the N Opt changes by 7 kgN/ha for every 1 point change in the BER.
Over 40 years of Yara R&D in nitrogen sdource work has helped in understanding that ammonium nitrate is the optimum nitrogen source for UK conditions.
In 1994 Yara carried out a 5 year trial looking at different Nitrogen sources on wheat, oilseed rape and silage grass. This work was repeated for wheat in 2009 and the results from the first year indicate the yield losses possible from using urea compared to ammonium nitrate. As shown in the graph above, Ammonium Nitrate out yielded Urea by nearly 0.5 t/ha equating to a 4.99% loss.
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