Abstract
NBPT (N-(n-butyl) thiophosphoric triamide), a urease inhibitor, has been reported as one of the most promising compounds to maximize urea nitrogen use in agricultural systems. The objective of this study was to evaluate the performance of irrigated wheat fertilized with urea or urea + NBPT as single or split application. The experiment was conducted from June to October 2006 in Viçosa, MG, Brazil. The experimental design followed a 2×2 factorial scheme, in which urea or urea + NBPT were combined with two modes of application: full dose at sowing (60kg ha-1) or split (20kg ha-1 at sowing + 40kg ha-1 as topdressing at tillering), in randomized blocks with ten replications. The split application of nitrogen fertilization does not improve the yield wheat under used conditions. The use of urease inhibitor improves the grain yield of wheat crop when urea is applied in topdressing at tillering, but its use does not promote difference when urea is applied in the furrow at planting.
Highlights
Several studies have been conducted to evaluate the correct time of nitrogen fertilization on wheat crop under Brazilian tropical conditions (Silva et al, 2008; Megda et al, 2009; Espindula et al, 2010; Hastenpflug et al, 2011; Teixeira Filho et al, 2011 Espindula et al, 2013)
The results suggest that urea + NBPT when applied to surface provided greater recovery of N by wheat plants which resulted in higher nutrient content in grains, as suggests Marino et al (2011)
The split application of nitrogen fertilization does not improve the yield of wheat under the conditions used
Summary
Several studies have been conducted to evaluate the correct time of nitrogen fertilization on wheat crop under Brazilian tropical conditions (Silva et al, 2008; Megda et al, 2009; Espindula et al, 2010; Hastenpflug et al, 2011; Teixeira Filho et al, 2011 Espindula et al, 2013). These studies take into account the application of nitrogen fertilizer at sowing and topdressing and suggest that N application just at sowing is enough to provide N during crop cycle. As commonly fertilizer is not incorporated, N is subject to volatilization losses (Costa et al, 2003)
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