| Abstrakt: |
Plant symptoms indicating threshold soil herbicide levels on a Typic Quarzipsamment,Eufaula fine sand, are described and illustrated for five long‐residue phytotoxic compounds from three chemical families: the substituted ureas, the triazines, and the pyridines. Cucumis sativadeveloped marginal chlorosis with 1 ppmw fluometuron (3 (m‐trifluoromethylpheny1)‐1,l‐dimethylurea); palmate veinal chlorotic pattern with 1 ppmw prometryne (2‐methylmercapto‐4,6‐bis (isopropylamino)‐1,3,5‐triazine); auxin‐type manifestations of meristematic tissues with 0.01 ppmw picloram (4‐amino‐3,5,6‐uichloro‐picolinic acid); and an interveinal chlorotic pattern with 1 ppmw pyriclor (2,3,5‐trichloro‐4‐pyridinol). Robinia pseudoacaciadeveloped severe leaf curling and stem twisting with tendril type appearance and restricted club‐like root system at 1 ppmw N‐serve (2‐chloro‐6‐(trichloromethyl) pyridine). |
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