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a Est. Exp. Agropecuaria INTA, Balcarce, Buenos Aires, Argentina
b Est. Exp. Agropecuaria INTA, Balcarce, Buenos Aires, Argentina, and Fac. de Ciencias Agrarias (UNMP) Unidad Integrada Balcarce, C.C. 276, (7620) Balcarce, Buenos Aires, Argentina
c Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, C.C. 276, (7620) Balcarce, Buenos Aires, Argentina
* Corresponding author (hecheverr{at}balcarce.inta.gov ar)
Received for publication December 12, 2003. High N requirements of no-tillage maize (Zea mays L.) make it imperative to develop management strategies that optimize crop production and N use efficiency (NUE). A 4-yr field experiment was conducted at Balcarce (37°45'S, 58°18'W), Argentina, on a Typic Argiudoll and a Petrocalcic Paleudoll. The objective was to evaluate the effect of urea rate (0, 70, 140, and 210 kg N ha–1) at planting (FPL) or six-leaf stage (FV6) on NH3 volatilization, denitrification, soil residual nitrate, soil microbial biomass N (MBN), N uptake, grain yield, and unaccounted N (UN). Grain yield was 10.5 and 11.2 Mg ha–1, and N uptake at physiological maturity was 168 and 192 kg N ha–1 (average of N rates) for FPL and FV6, respectively. Gaseous N losses ranged from 7.6 to 13.8% of applied N and were not affected by the fertilizer time. Relative to unfertilized control, fertilized treatments increased MBN (13.4 kg N ha–1) similarly for both fertilization times. For FPL, UN was 55, 69, 86, and 103 kg N ha–1 for 0, 70, 140, and 210 kg N ha–1, respectively. For FV6, UN was 55, 46, 49, and 34 kg N ha–1 for 0, 70, 140, and 210 kg N ha–1, respectively. The losses were attributed to nitrate (NO3) leaching. Results of this experiment show that high fertilizer NUE in combination with economically competitive grain yields can be obtained when N is applied at V6 because gaseous N losses are low (less than 13.8%) and NO3 leaching would be reduced.
Abbreviations: CET, crop evapotranspiration • CL N2O-N, cumulative nitrous oxide nitrogen losses • CT, conventional tillage • FPL, fertilization at planting time • FV6, fertilization at six-leaf stage • MBN, microbial biomass nitrogen • NT, no-tillage • NUE, nitrogen use efficiency • UN, unaccounted nitrogen
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