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Representation of bromide movement by the volume visualization technique



Representation of bromide movement by the volume visualization technique



Terra: Organo Cientifico de la Sociedad Mexicana de la Ciencia del Suelo AC 24(1): 27-35



The volume visualization technique allows representing any phenomenon in a solid geometric shape, with characteristics of continuity, distribution and structure in layers or levels. Potassium bromide (KBr) was used as a tracer in a study where alternated row irrigation was compared against complete irrigation. The anion bromide (Br), when it dissociates from KBr, may be used as simulator of the nitrate (NO3-N) movement. The KBr was applied at 60 sites of 0.3 x 1.2 m distributed along the length of the furrow (five sites) keeping the same distance between each and using 12 furrows according to an experimental design. Three samplings in four sequenced depth levels were taken after the first and third irrigation and after harvesting corn. Geostatistics was used to interpolate the Br(-) values by means of Kriging. Georeferenced sample points were distributed in a 6.5 ha field. By stacking a series of 3-D Br(-) surfaces, the IDL (Interactive data language) program created a cubic image that reconstructed the Br(-) movement in soil. Reconstructed images were compared against conventional graphics; also, preferential flow was identified where Br(-) moved deeper. Under continuous row irrigation, Br(-) moved 1.52 m and under alternated row irrigation, Br(-) moved only 0.72 m. When simulating the NO3-N movement with Br(-) from the soil surface beyond the radical zone, this permitted determination of the structure of horizontal and vertical distribution, as well as the NO3-N leaching under the alternated irrigation and fertilization.

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