A new protocol for estimating the determinacy of potato varieties will be released in the next few months and will be added to the AHDB Nutrient Management Guide (RB209).
Hoe sal die nuwe protokol die bedryf bevoordeel?
- Die protokol sal telers en betrokkenes by die ontwikkeling van variëteite help om tyd en geld te bespaar wanneer hulle stikstofaanbevelings vir nuwe variëteite opstel
- Produsente en landboukundiges sal akkurater stikstof / bepalingsgroeperings vir beide nuwe en bestaande kultivars kry, en dus die N-dosis wat op hul oes toegepas word, verbeter.
Aardappelbepaling - wat is dit en waarom is dit relevant vir plantvoeding?
A key component of nitrogen fertiliser recommendations as used in the AHDB Nutrient Management Guide (RB209), is the nitrogen (determinacy) group.
Hierdie is gebaseer op vier groepe: Groep 1 (baie vasberade) tot Groep 4 (baie onbepaald):
- Potato varieties such as Accord, Estima and Innovator are part of Group 1 as they cease leaf production after the first (or indeed second or third flowers) but when compared with indeterminate varieties, they will produce fewer leaves
- Varieties classified as group 4 determinacy, for example Cara, Markies and Royal, continue to produce leaves and flowers until they are curtailed by shorter days and frost
“It is essential to know the grouping of your variety, in order to calculate the correct nitrogen recommendations,” said Alice Sin, AHDB Resource Management Scientist.
Die nuwe protokol
Navorsing deur AHDB and NIAB, with the help of Greenvale AP and Cygnet PB, has resulted in a new protocol for estimating determinacy. The determinacy of the potato varieties was studied using the following four methods: plant ground cover, main axis nodes and harvest index measure both fresh and dry weight. The current approach is to count main-axis nodes on the potato plant since this method is robust, quick, cheap and non-destructive. By combining the four methods, highly reliable data has been obtained.
Vorige metodes wat die N-dosis vir verskillende variëteitsgroepe bepaal het, was afhanklik van die uitvoer van verskeie duur stikstofresponseksperimente. As gevolg hiervan kon baie variëteite verkeerd toegedeel gewees het, wat gelei het tot die toediening van min of meer N as wat nodig was.
Alice Sin het gesê: "Sommige van die vorige N-tariewe-groeperings was gebaseer op opinies en terloopse veldwaarneming. Ons is verheug om nou 'n protokol te publiseer wat op bewyse gebaseer is, want dit sal die hele bedryf 'n groot hulp bied."
These updated groupings, including newer varieties from the top 50 varieties grown in GB, will be incorporated in the 2021 revision of the AHDB Nutrient Management Guide (RB209) Section 5.
Trials by Meijer Seed Potato Ltd
The protocol is currently being trialled by Meijer Seed Potato Ltd, and it will be published on the AHDB website in the coming months. Max Tärneberg, Meijer International Product Manager, said: “We are in a useful position for this project because we have multiple trial sites across the UK with plots containing our entire variety portfolio.
Hierdie jaar gaan ons die metode van die tel van nodusse saam met ons normale assesserings insluit, ooreenkomstig die nuwe protokol. Ons het reeds 'n goeie begrip van die N-groeperings van al ons nuutste variëteite, wat ons sal help om hierdie nuwe stelsel te kalibreer. As ons vind dat dit akkuraat is teenoor ons huidige begrip, kan dit groot gevolge hê vir die suksesvolle bemarking van nuwer variëteite. Ons kan 'n N-groepering vir 'n verskeidenheid hê voordat dit selfs 'n naam kry! '
Max Tärneberg erken die behoefte aan die nuwe protokol vir die aartappelbedryf:
"In 'n breër bedryfsin kan dit die N-groeperings van baie variëteite op datum bring. As meer akkurate N-aanbevelings makliker beskikbaar is vir ons bedryf, kan ons beduidende besparings ondersoek."
To support the industry further the new protocol will be included in the training courses provided by Artis and will also be discussed during workshops which will be organised at AHDB’s Strategic Potato Farms (Spot) this year. This will include Scotland’s new SPot farm, seed potato supplier, Milton of Mathers farm, situated in St Cyrus, Montrose.
