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Stability of Grain Yield, Endosperm Modification, and Protein Quality of Hybrid and Open-Pollinated Quality Protein Maize (QPM) Cultivars

^a International Maize and Wheat Improvement Center (CIMMYT), P.O. Box MP163, Mount Pleasant, Harare, Zimbabwe
^b Pioneer SARL, 24 Rue du Moulin, F-68740 Nambsheim, France

View larger version (16K): [in a new window]   Fig. 1. AMMI (additive main effects and multiplicative interactions model) plots for grain yield and endosperm modification score (1–5) of open-pollinated (OP) and single-cross (SC), three-way (TW) and double-cross (DC) QPM hybrids evaluated at multiple locations (see Table 2 for key to location numbers) between 1990 and 1993.