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Potato nitrogen groups
Nitrogen requirements of potatoes are determined by the nitrogen group of the variety and the length of its growing season. Find out what the requirements are and how to assign the groups.
Read research reports on determinacy and N management in potatoes
Identifying the varieties nitrogen group
Nitrogen recommendations split potato varieties into one of four groups according to their degree of determinacy (a measure of the crop’s capacity to maintain leaf production after the first appearance of flowers). AHDB research at NIAB-CUF has consistently shown that for a given length of growing season, indeterminate varieties (groups 3 and 4) require less nitrogen than determinate varieties (groups 1 and 2).
The table below lists potato varieties by nitrogen group. It includes the ratings for those varieties included in previous editions of this guide while others are assigned to a group based on the new in-field method developed by AHDB.
In addition, factors such as total nutrient balance, water availability and seed management will also influence foliage longevity. The list is provided as an indication of determinacy groups, but you are advised to seek the latest information from your agronomist or seed supplier for any particular variety.
Variety determinacy groups
Group 1 – Short haulm longevity |
Group 2 – Medium haulm longevity |
Group 3 – Long haulm longevity |
Group 4 – Very long haulm longevity |
Determinate varieties |
Partially determinate varieties |
Indeterminate varieties |
|
Accord |
Atlantic |
Agria |
Asterix |
Annabelle |
Amanda |
Ambo |
Brooke |
Anya |
Arcade |
Amora |
Cara |
Colmo |
Carlingford |
Arsenal |
Electra* |
Estima |
Charlotte |
Cabaret |
Lady Balfour |
Innovator |
Courage |
Caesar |
Markies |
Maris Bard |
Dundrod |
Cosmos |
Royal |
Minerva |
Endeavour |
Cultra |
Vales Everest |
Premiere |
Harmony |
Daisy |
Vales Sovereign |
Rocket |
Juliette |
Desiree |
|
Vales Emerald |
Kestrel |
Eos |
|
Winston |
Lady Claire |
Fambo |
|
|
Lady Rosetta |
Fianna |
|
|
Marfona |
Hermes |
|
|
Maris Peer |
Jelly |
|
|
Maritiema |
Kerr's Pink |
|
|
Melody |
King Edward |
|
|
Miranda |
Lady Christl |
|
|
Mozart |
Lady Valora |
|
|
Nadine |
Maris Piper |
|
|
Nectar |
Morene |
|
|
Nicola |
Navan |
|
|
Orchestra |
Pentland Dell |
|
|
Orla |
Pentland Squire |
|
|
Osprey |
Picasso |
|
|
Pentland Javelin |
Record |
|
|
Rembrandt |
Rooster |
|
|
Romano |
Russet Burbank |
|
|
Saxon |
Sante |
|
|
Shannon |
Sassy |
|
|
Shepody |
Saturna |
|
|
Vivaldi |
Shelford |
|
|
VR808 |
Slaney |
|
|
Wilja |
Stemster |
|
|
|
Valor |
|
|
|
Victoria |
|
Information provided by NIAB-CUF and AHDB
*At the high end of recommendations
Bold – added 2021
In-field method for assigning nitrogen group (determinacy) in potatoes
This practical method of counting potato leaves allows you to identify the nitrogen group quickly and easily.
Learn more about the in-field method
Useful links
Nutrient management for potatoes
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