Herbicidal 1-alkenyltetrazolinones

A 1-alkenyltetrazolinone of the formula:

• ##STR415## wherein R.sup.1 represents the group:
• ##STR416## or the group:
• ##STR417## wherein A represents hydrogen, C.sub.1-4 alkyl, halogen or C.sub.1-2 haloalkyl,
• B and D, independently of one another, represent hydrogen, C.sub.1-4 alkyl or halogen, or
• B and D form, together with the C-atom to which they are bonded, C.sub.5-6 cycloalkylidene,
• T represents hydrogen or C.sub.1-4 alkyl,
• n represents 0, 1, 2 or 3,
• E represents the group:
• ##STR418## wherein J and L, independently of one another, represent hydrogen, C.sub.1-4 alkyl or halogen, and
• G represents hydrogen or C.sub.1-4 -alkyl, or
• E and G form, together with the C-atom to which they are bonded, C.sub.5-6 cycloalken-1-yl,
• R.sup.2 and R.sup.3, independently of one another, represent C.sub.1-6 alkyl, C.sub.3-7 cycloalkyl which is optionally substituted by methyl, C.sub.2-4 alkenyl, C.sub.2-5 alkynyl, optionally substituted phenyl or optionally substituted aralkyl wherein the optional substituents are halogen, C.sub.1-4 alkyl, C.sub.1-2 alkoxy, C.sub.1-2 haloalkyl, C.sub.1-2 haloalkoxy, C.sub.1-2 haloalkylthio, cavano, nitro, and acetyl,
• R.sup.2 and R.sup.3 form, together with the N-atom to which they are bonded, form a heterocyclic ring which is optionally substituted wherein said heterocyclic rings are moieties selected from the group consisting of pyrrolidin-1-yl, piperidin-1-yl, indolin-1-yl, indol-1-yl, 1,2-dihydroquinolin-1-yl, and 1,2,3,4-tetrahydroquinolin-1-yl and the optional substituents are C.sub.1 -C.sub.4 -alkyl or halogen.