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Aims: This study aimed to select efficient and responsive maize genotypes to the use of nitrogen for silage. Study Design: The experimental design was randomized blocks in a 2 x 11 factorial scheme, the first factor being two nitrogen levels: 165 kg ha -1 of N and 15 kg ha -1 of N, and second factor eleven maize genotypes: BRS 3046, M 274, AG 8088PRO2, ANHEMBI, PR 27D28, AG 1051, P33-16, P33-11, P29-M12, P36-19, and P40-8. Place and Duration of Study: The experiment was carried out in the 2017/18 harvest at Sítio Vitória (8o18'32" S, 50o36'58" W), located in the municipality of Santa Maria das Barreiras, southern region of Pará state, Brazil. Original Research Article Santos et al.; ARRB, 35(9): 89-95, 2020; Article no.ARRB.60524 90 Methodology: Sowing fertilization was performed in the furrow with 300 kg ha of NPK 5-25-15. Topdressing nitrogen fertilization was performed only at high N, having as source urea (45% N) at a dose of 150 kg ha -1 of N. Parceled in stages V4 and V8. The shoot fresh mass was evaluated at stages R4 and R5, with the cut performed 20 cm from the soil. Results: The highest shoots fresh masses were obtained in treatments with high use of N, with a general mean of 628 g plant. The mean response of 1.87 g of plants per kg of N applied. Genotypes M 274, AG 8088PRO2, PR 27D28, AG 1051 and P 36-19 were efficient to use N. Genotypes AG 8088PRO2, PR 27D28, P29-M12, and P 36-19 were classified as responsive to N application. Conclusion: Genotypes AG 8088PRO2, PR 27D28 and P36-19 were efficient in use and responsive to nitrogen application. And they are recommended for cultivation with low and high technological level.

Efficiency and Response to Nitrogen Use in Maize Genotypes for Silage Production in Tropical Climate