Resumo

ARZADUN, M; LABORDE, H  e  ARROQUY, J. Fertilización nitrogenada en trigo para la producción de forraje y grano en el sudoeste de la provincia de Buenos Aires (Argentina). Agriscientia [online]. 2013, vol.30, n.1, pp.1-11. ISSN 1668-298X.

When forage and grain are obtained from a wheat crop, (Triticum aestivum), i.e. a dual purpose crop (DP), the availability of N can be a key factor for the expansion of this alternative system. The response to nitrogen fertilization of a DP crop fertilized in April (DPF), in August (DPG), in both dates (DPFG) and in wheat grown only for grain (TC) was compared in a factorial experiment with the N levels 0, 40, 80, 120, and 160 N kg ha^-1, applied as broadcast urea. Forage and grain yield and N content of each product were determined. Forage yield increased, on average, 10.3 kg dry matter per kg of applied N, up to the 120 kg ha^-1 level. Grain yield was lower in DP than TC but had a higher response to N, increasing on average 8.3, 7.3, 4.7, and 4.7 Kg per kg applied N, for DPG, DPFG, DPF and TC respectively. The agronomic efficiency of the response to N in grain yield was higher in DP than in TC and these results show that N fertilization in DP is more convenient than in TC.

Palavras-chave : Nitrogen; Wheat; Forage; Grain; Response efficiency.

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