| abstract |
A method of increasing the yield of a soyabean crop comprises treating the crop with a compound of the general formula I or, where possible, an acid addition salt thereof: <IMAGE> in which Het represents an optionally substituted 5-membered heterocyclic ring containing one hetero atom; Ar represents an optionally substituted phenyl group; Q represents a hydrogen atom or an alkyl group; and either X and Y together represent a bond, or X represents a hydrogen atom and Y represents a hydrogen atom or an acyl group derived from a carboxylic acid. Preferably Het is a 2- or 3-furyl, thioenyl or pyrrolyl group, or one of the corresponding tetrahydro groups. |