Advances in the study of the movement of glyphosate, AMPA and sediments in a Typic Argiudoll in a micro-basin of the Arrecifes River under no-tillage

DAIANA SAINZ; FILIPE BEHRENDS KRAEMER; PATRICIA CARFAGNO; MAXIMILIANO EIZA; CELIO IGNACIO CHAGAS

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Congreso; XXV Congreso Aapresid. 7mo Congreso Mundial de Agricultura de Conservación.; 2017

AAPRESID

In Argentina, the incorporation of transgenic crops (TC) and glyphosate together with no-tillage systems (NT) lead to a substantial change in agricultural production. The degradation of glyphosate is regulated by soil biological activity, where the main metabolite is AMPA (acid methyl phosphoric amino). The fate of both molecules in the environment depends on climatic conditions, edaphic variables and agricultural management. The reduction of structural stability (SS) and the occurrence of platy structures (PS) are frequent features in the undulated Pampas under NT. This frequency often increases in the crop sequences with high inclusion of soybean, which in turn, could influence the movement of glyphosate and AMPA and sediment yield. The objective of this study was to quantify the transport of glyphosate, AMPA and sediments by means of rainfall simulations (rainfall intensity: 60 mm h-1; plots of 0.25 m2) at two sampling dates (July and October) as well as the effects of both SS and PS. The production plot was located in a micro-basin belonging to the Arrecifes River on a Typic Argiudoll (Arroyo Dulce series). The sediment yield did not show significant differences between sampling dates (p