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11140044 Determinacy of varieties

Publication Date: 
3 July 2017
Author/Contact :
Marc Allison

Contractor :

Full Title: Improving Nitrogen Recommendations for Potatoes Through Estimation of Determinacy of Varieties
Duration: 01/03/2017 to 31/01/2020

Currently, there are no objective, cost-effective ways of establishing the nitrogen (N) determinacy group of new varieties.  Yet, this information is essential to determine the appropriate N application rate for a given season length and soil N supply.  In consequence, during initial commercialisation new varieties are often given incorrect applications of N fertiliser resulting in increased production costs, yield loss, poor crop quality and increased wastage. Anecdotally, due to this inappropriate agronomy during initial commercialisation, some otherwise promising varieties have not achieved their full commercial potential.  Mis-allocation of N determinacy group in seed crops could be detrimental to yield, skin-set and pathological loading.
To generate protocols and data to define the N determinacy groups of potato varieties.
a) Use an extensive database of measurements (e.g. canopy persistence and harvest index) made in experimental and commercial crops to examine the relationships between these data and nitrogen determinacy group.
b) To test the practicality and utility of the database-derived and new metrics in replicated experiments and in observations made on commercial varietal trials
c) To produce a simple protocol that will enable users to quantify determinacy groupings
d) Collate all suitable data and objectively allocate the main potato varieties to determinacy groups.

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