| http://www.w3.org/ns/prov#value | - s a hydrogen atom or a (C.sub.1 -C.sub.6) alkyl group or radical; X is a hydrogen atom, a halogen atom, a trihalomethyl group, a (C.sub.1 -C.sub.6) alkyl group, a nitro group, a cyano group or a (C.sub.1 -C.sub.4)alkoxy group; and n is the integer 1 or 2; and the agronomically acceptable salts thereof.Among the preferred compounds of the present invention are compounds of Group C, Formula (XXXI) w
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