Fig. 4. Mean forage nitrate concentrations of genetic background entries in two nurseries (Nursery 1 and Nursery 2; 12 unique backgrounds in each nursery) managed as dual-purpose (DP) wheat crops in 2001 and 2002. Means are averages across the base (B) and selected (grain-only, GO; DP) bulk subpopulations. Each horizontal gray bar within a nursery marks the yearly 25 to 75% quartiles.