Water Quality Implications of Encapsulated Atrazineby Adel Shirmohammadi, Univ of Maryland, College Park, United States,
Timothy J. Gish, Univ of Maryland, College Park, United States,
Raviraj Vyravipillai, Univ of Maryland, College Park, United States,
Abstract: This paper presents the movement of both encapsulated and wettable powder atrazine under no-till and conventional-till corn in the Coastal Plain physiographic region of Maryland. Soil cores and suction lysimeters were used to evaluate the movement, mobility, and persistance of each formulation under different tillage systems. Results obtained from soil cores indicated that less than 1% of both wettable powder and starch encapsulated atrazine was present below 40 cm depth two weeks after application. Starch encapsulated atrazine was found to be less mobile under both tillage systems. Soil cores showed that no-till system had less herbicide than the conventional till system regardless of the atrazine formulation. Results of solution samples revealed similar conclusions regarding low mobility of starch encapsulated atrazine.
Subject Headings: Water quality | Pesticides | Measuring instruments | Soil suction | Groundwater pollution | Coastal plains | Crops | North America | Maryland | United States
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