Vol: 31 Page: 207

Authors:
João Tiago Mexia
Dulce Gamito Pereira

Title:
 Joint regression analysis for winter rye cultivars using L2 indexes

Language: English

Keywords:
joint regression analysis
L2 environmental indexes
winter rye

Summary:
A Joint Regression Analysis was carried out for 6 field experiments each with superblocks of 5 blocks. In each block 4 cultivars of winter rye were present.
Since the blocks were not complete minimum squares estimators for the environment indexes were obtained using the ZIG-ZAG algorithm. Then environmental indexes are called L2 indexes since they are obtained by summarizing an L2 norm. Using these indexes linear regressions of yields over environmental indexes were adjusted one per cultivar.
The cultivars were then compared using the upper contour approach and two of them (URSUS and RAH 697) were selected.