Comparison of uniformity decisions in DUS testing for full and reduced numbers of measurements
It is investigated how a reduction in the number of measurements influences uniformity decisions in distinctness, uniformity and stability (DUS) testing. Using real data from DUS trials performed in Poland for several species, it is shown that when final decisions are taken after three years of testing, a reduction in the number of measurements by 50% of the numbers indicated in the Guidelines has very limited impact on decisions (rejection or approval of candidate variety). Decisions taken after one year (or two years) are more dependent on the numbers of measurements.
- Department of Mathematical and Statistical Methods, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland, email@example.com
- The Research Centre for Cultivar Testing at Słupia Wielka, 63-022, Poland, firstname.lastname@example.org
- Department of Mathematical and Statistical Methods, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland, email@example.com
- Pilarczyk W., Kowalczyk B. (2011): The influence of reduction of the number of measurements on decisions concerning distinctness of perennial ryegrass varieties, Biometrical Letters 48(2): 149-157.
- Pilarczyk W., Kowalczyk B. (2012): The influence of reduction in measured plant number on distinctness of amenity varieties of perennial ryegrass (Lollium Perenne L.) tested in DUS trials, Colloquium Biometricum 42: 35-42.
- Pilarczyk W., Kowalczyk B. (2014): The influence of reduction of the number of measurements on decisions concerning distinctness of red fescue varieties – Colloquium Biometricum 44: 79-88.
- Talbot M. (2000): The Combined-Over-Years Distinctness and Uniformity criteria. UPOV, TWC/18/10, Geneva
- TGP/4/8 (2006): Ryegrass. Guidelines for the conduct of tests for distinctness, uniformity and stability, UPOV Geneva.
- TG/67/5 (2006): Red Fescue. Guidelines for the conduct of tests for distinctness, uniformity and stability, UPOV Geneva.
- TWC/26/17 (2008): Some consequences of reducing the number of plants observed in the assessment of quantitative characteristics of reference varieties, UPOV, Geneva.
- TWC/29/26 (2011): Cyclic planting of established varieties to reduce trial size, UPOV, Geneva.
- Weatherup S.T.C. (1992): Distinctness, Uniformity and Stability trial (DUST) analysis system. User manual. Department of Agriculture for Northern Ireland Biometrics Division, Belfast BT9 5PX.
- Watson S. (2000): DUST for Windows (DUSTNT), TWC/18/13 UPOV, Geneva.