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Chilean journal of agricultural research

versão On-line ISSN 0718-5839


CURITIBA ESPINDULA, Marcelo et al. Rates of urea with or without urease inhibitor for topdressing wheat. Chilean J. Agric. Res. [online]. 2013, vol.73, n.2, pp.160-167. ISSN 0718-5839.

The urease inhibitor NBPT(N-(n-butyl) thiophosphoric triamide) is a management alternative to increase urea efficiency in topdressing because it reduces NH3 volatilization. The objective of this study was to evaluate N recovery and yield performance of wheat (Triticum aestivum L.) ’BRS 254’ fertilized with different urea or urea + NBPT rates in topdressing. The experiment was conducted from May to September 2007 in Vicosa, Minas Gerais, Brazil. Treatments followed a 5 x 2 + 1 factorial design consisting of five N fertilizer rates (30, 60, 90, 120, and 150 kg ha-1) as urea or urea + NBPT (Agrotain®) applied as topdressing and a control without N. The experiment was a randomized complete block design with four replicates. Adding NBPT to urea resulted in better N utilization by wheat plants. The 100 kg N ha-1 topdressing rate provided the best apparent N recovery by wheat plants, whereas 90 kg ha-1 provided the best N use efficiency.

Palavras-chave : Triticum aestivum; nitrogen fertilization; NH3 volatilization; NBPT; N-(n-butyl)thiophosphoric triamide.

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