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Nitrogen Balance as Affected by Application Time and Nitrogen Fertilizer Rate in Irrigated No-Tillage Maize

^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

View larger version (44K): [in a new window]   Fig. 1. Rainfall (R) plus irrigation (I) and maize crop evapotranspiration (CET) during the growing season.

View larger version (26K): [in a new window]   Fig. 2. Crop N uptake for unfertilized and fertilized treatments in the 1995–1996 and 1996–1997 growing seasons in relation to (a) the change in soil microbial biomass N for the period between planting and physiological maturity of the preceding season (1994–1995 or 1995–1996) and (b) residual NO–3–N measured at the physiological maturity growth stage of the preceding season.

View larger version (48K): [in a new window]   Fig. 3. Components of N balance as a function of different N rates and application times. Available N represents soil NO–3–N at planting time (0- to 100-cm soil depth) plus N applied (N rates are shown in parentheses) and mineralized N from organic matter. Res. Nit = soil NO–3–N at physiological maturity (0- to 100-cm soil depth); MBN = change in soil microbial biomass N content (0- to 20-cm soil depth) between physiological maturity (end) and planting (beg), i.e., MBN = MBNend – MBNbeg; Ndes = denitrification loss; Nvol = volatilization loss; NL = apparent N loss by leaching; and CNU = N accumulated by the crop.