ABSTRACT
A study was conducted on nitrate displacement in soil applied at two different concentrations with the irrigation water, under unsteady conditions, using leaching columns filled with air-dried, sieved soil from a material classified as Oxisol (LVa; horizon B). The moisture and nitrate concentration patterns were determined at four different times, 4, 24, 72 and 168 h after application. The results of the soil moisture and nitrate distribution patterns behaved according to nitrate concentrations applied to the column's superior and inferior extremities.
Key words:
nitrate; miscible displacement; unsteady flow