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- W2279376446 abstract "The objective of this work was to evaluate nitrogen losses and nitrate concentration by drainedwater through the soil profile in the traditional and anticipated maize nitrogen (N) application inno tillage system. Maize crop was cultivated in succession of black oats using two rainfallregimes: normal rainfall -NR-, considering an average period of 30 years and “El Nino” rainfall– ENR- (1997/98). The experiment was conducted during 1997/98 growing season in anexperimental area of the Federal University of Santa Maria, Brazil. A set of eight drainagelysimeters was used under a rain shelter. Treatments used were: (i) 180 kg N/ha+ENR –application of 150 kg N/ha in pre-sowing and 30 kg N/ha at sowing with ENR; (ii) 90+ENR –application of 30 kg N/ha at sowing, 30 kg N/ha at 31 and 57 days after emergency (DAE) withENR; (iii) 0 kg N/ha+ENR – without N application and ENR and; (iv) 90+NR – application of30 kg N/ha at sowing, 30 kg N/ha at 31 and 57 DAE with normal rainfall. The intensive rainfallcombined with high soil water infiltration, probably increased the amount of drained water andnitrate percolation from the upper layers into de soil profile. The nitrate concentration of thedrained water was higher than critical value (10 mg/L) right after application of N before sowing from the lysimeters submitted to 180+ENR treatment. Water samples collected from thelysimeters submitted to the anticipated N application, traditional N application and without Napplication with ENR, 86%, 50% and 31% resulted in nitrate concentration in the drained waterabove the critical limit, respectively. These results clearly indicated that the pre-sowingapplication of a high amount of N enhanced soil nitrogen availability before and right after plantemergency. However, these conditions associate with intensive rainfall may cause elevated Nlosses and water contamination." @default.
- W2279376446 created "2016-06-24" @default.
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- W2279376446 date "2001-01-01" @default.
- W2279376446 modified "2023-09-27" @default.
- W2279376446 title "WATER EXCESS EFFECTS ON NITROGEN LOSSES BY PERCOLATION DURING MAIZE CROP GROWING SEASON" @default.
- W2279376446 doi "https://doi.org/10.13031/2013.4422" @default.
- W2279376446 hasPublicationYear "2001" @default.
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