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Micromovement Mechanisms of s‐Triazines in Soil
Author(s) -
Lavy T. L.
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200030031x
Subject(s) - loam , soil water , chemistry , organic matter , atrazine , agronomy , environmental chemistry , soil science , pesticide , environmental science , biology , organic chemistry
In situ autoradiography of corn ( Zea mays L., var. WF9 × Hy) roots grown in bands of three different soils treated with 14 C ring‐labeled s ‐triazines showed that both mass flow and diffusion of the herbicides occur. Mass flow was the most important means of moving the herbicide to the absorbing root in the case of 2‐chloro‐4‐ethylamino‐6‐isopropylamino‐ s ‐triazine (atrazine) the most water soluble of the herbicides studied. Movement of the soil‐applied herbicides to the corn roots did not insure uptake of the chemical. Mass flow patterns were clearly present around roots growing in the band of 2‐chloro‐4, 6‐isopropylamino‐ s ‐triazine (propazine) treated Sharpsburg silty clay loam soil; however, the least amount of 14 C uptake occurred on this soil‐herbicide combination indicating restrictive herbicide uptake by the plant root. Adsorption of the s ‐triazines on the three soils increased as the soil acidity, organic matter, and clay content increased. Plant uptake of 14 C decreased as the soil acidity, organic matter, and clay content increased.