The aim of this paper is to evaluate the morphological response in seedlings of different genotypes of maize (Zea mays L.) grown under contrasting nitrogen conditions. As a plant material, four maize cultivars grown in the Mexican State of Puebla were studied: variety SB 302 Berentsen, blue landrace (Hueytamalco), and white and blue landraces (Tepexi de Rodríguez) assessed by 42- day trials of plant growth using a floating root technique. The two-factor experiments were a completely randomized design. The plants were grown under controlled conditions using the modified nutrient solution at 20 and 100% nitrogen. The results show that the maize seedlings revealed a significant level of phenotypic variation in their architecture. The blue landrace (Tepexi de Rodriguez) showed the best results both at 20 and 100% nitrogen.
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