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• W143377319 abstract "Nitrogen fertilization is a common practice in no-tillage (NT) corn. However, when fertilizers like urea are broadcasted on soil surface, volatilization losses could decrease crop nitrogen availability. Two experiments were carried out at INTA Experimental Station, Balcarce, Argentina (37o45' S; 58o18' W), during 1998/99 and 1999/00 growing seasons. In 1998/99 treatments were: 1) without nitrogen, 2) urea broadcasted, 3) calcareous ammonium nitrate (CAN) broadcasted and 4) urea incorporated (4 cm). In 1999/00 the same treatments were evaluated except CAN. Nitrogen rate (70 kg N ha-1) was applied at six leaves corn growing stage (V6). In both years volatilization losses, chlorophyll content at flowering, aboveground biomass, accumulated nitrogen and grain yield at physiological maturity were evaluated. Both years, volatilization losses from broadcasted urea were not higer than 7% of applied nitrogen. Volatilization losses from incorporated urea were lower than 0,1%. Averaged through the years, grain yield was significantly increased by nitrogen fertilization (7480 and 9980 kg ha-1, control versus fertilizer treatments, respectively), but it was not different between nitrogen source or placement methods. Chlorophyll content was increased by nitrogen fertilization in both years, regardless of nitrogen source or placement methods. Nitrogen recovery (kg N uptake from fertilizer/kg N applied) as determined by difference method was not different between CAN and urea incorporated (0,90, average years) and this value was greater than broadcasted urea (0,75, average years). There were no differences in nitrogen use efficiency (kg grain/kg N applied) between urea placement methods or nitrogen sources, because physiological efficiency was greater for urea broadcasted than incorporated urea or CAN. Therefore, the incorporation of urea below residues would not be advantageous practice for Balcarce area, because volatilization losses were not high under theses conditions." @default.
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• W143377319 date "2003-01-01" @default.
• W143377319 modified "2023-09-23" @default.
• W143377319 title "Respuesta del cultivo de maíz bajo siembra directa a la fuente y al método de aplicación de nitrógeno" @default.
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