Abstract: The salts of 1-phenylimidazole-5-carboxylic acids substituted in the phenyl ring, of the general formula (I) ##STR1## exhibit a good plant growth-regulating activity. In the general formula the symbols have the following meaning:Y is an ammonium ion substituted up to fourfold by (substituted) alkyl, (substituted) alkenyl, alkynyl, (substituted) cycloalkyl, cycloalkenyl, and (substituted) phenyl, wherein the charged N may be part of a heterocyclic radial (NH.sub.4.sup.+ is excepted); phosphonium ion substituted fourfold by alkyl, (substituted) phenyl or (substituted) benzyl; sulfonium- or sulfoxonium ion substituted threefold by alkyl, (substituted) phenyl or (substituted) benzyl; the guanidinium ion or an O-alkylisourea cation;R.sup.1, R.sup.2 independently of each other are alkyl;R.sup.3 is alkyl, alkoxy or halogen; andn is 0, 1, 2 or 3.

Abstract: Plant growth regulators comprising a compound of the formula I ##STR1## wherein x=0, S or N, R.sup.1 =hydrogen, phenyl, alkenyl or (substituted) alkyl and, when X=0 or S, also a metal cation or ammonium cation, n=1 when X=0 or S, and 1 or 2 when X=N, R.sup.2 and R.sup.3 =alkyl, R.sup.4 =alkyl, alkoxy or halogen and m=0, 1, 2 or 3, and, when R.sup.1 does not represent a cation, their acid addition salts, complex salts or quaternization products, in combination with a compound of the formula IIR--CH.sub.2 --CH.sub.2 --N.sup.+ (CH.sub.3).sub.3 Cl-- (II)wherein R denotes OH or Cl, or in combination with N,N-dimethylpiperidinium chloride.

Abstract: A process for increasing the carbohydrate accumulation in plants by application of compounds of the class of phenoxyphenoxy-, pyridyloxy-, benzoxazolyloxy-, benzothiazolyloxy-, quinolinyloxy-, quinazolinyloxy-phenoxypropionic acid derivatives or cyclohexanedione derivatives.

Abstract: Compounds of the formula ##STR1## where R.sub.1 is H or Hal and R.sub.2 is a variety of functional groups among which is hydroxy, alkoxy and (substituted) amino, are valuable grass herbicides.

Abstract: Compounds of the formula ##STR1## WHEREIN R is halogen, (C.sub.1 -C.sub.4)alkyl, halo-(C.sub.1 -C.sub.4)alkyl, (C.sub.1 -C.sub.4)alkoxy, halo(C.sub.1 -C.sub.4)alkoxy, phenyl, --NO.sub.2, --NH.sub.2 or --CN;R' is (C.sub.1 -C.sub.4)alkyl or halogen;n is an integer of from 1 to 3;n.sub.1 is zero or an integer of from 1 to 3;Y is (C.sub.1 -C.sub.6)alkylene andX is --COOH, --COO--(C.sub.1 -C.sub.8)alkyl, --CONH.sub.2, --CONH--NH.sub.2, --CN or --COO--Cat,"Cat" being the cation of an inorganic or organic base, are useful as selective grass herbicides.