Since the mid 1990s, the average concentration of amino-N in beet delivered to British Sugar factories has decreased progressively from around 160 to 70mg/100g/sugar. A decade ago less than 1% of the delivered beet had amino-N concentrations of less than 70 mg/100g sugar – the proportion is now over 30%. A similar pattern has been seen in the Sudzucker factories in Germany.
Outcomes / Key Message For Growers And Industry
The main conclusions relating to the recent downward trends in the amino-N contents of beet (kg/ha) were that (a) they were not associated with lower inputs of N from fertilizers or manures and (b) they were associated more with improvements in agronomy, husbandry and seasonal growing conditions than with the introduction of varieties having a lower concentration of amino-N.