Liquid composition comprising phenyl phosphorodiamidate of the structure: including salts, tautomers, polymorphs and metal complexes of the compound of said formula, which have urease inhibiting activity; at least one dispersion medium selected from: a) vegetable oils b) fatty acid alkyl esters, c) one or more solvents selected from the following: dimethyl sulfoxide, pyrrolidin-2-one, glycerol formal, ethylene glycols and their mono/diethers, propylene glycols and their mono/diethers, and one or more components selected from the group consisting of: paraffin oils, waxes, surfactants, emulsifiers, one or more suspension stabilizing agents; wherein the suspension stabilizing agent is selected from the group consisting of polyvinyl alcohols, polyvinylpyrrolidones, xanthan gum, dextran, tylose, carboxymethylcellulose, ethylcellulose, methylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose and methylethylcellulose, wherein the phenyl phosphorodiamidate is present in an amount of 0.5-30% by weight, the oil(s) and/or fatty acid alkyl ester(s) are present in an amount of 50-99% by weight, and the surfactant is present in an amount of 0.1-10% by weight, 0.1-10% by weight of kerosene oil are present, 0.1-10% by weight of wax are present, the emulsifier(s) are present in an amount of 0.1-5% by weight, wherein the emulsifier(s) are nonionic surfactants and/or wherein the emulsifier(s) are fatty alcohols, fatty alcohol ethoxylates, alkyl polyglycol ethers, sorbitan fatty acid esters, polyglycerol esters of (poly) fatty acids, mono- and diglycerides of fatty acid or beeswax, and 0.05-5% by weight of one or more suspension stabilizing agents are present, in each case based on the total composition. a) vegetable oils b) fatty acid alkyl esters, c) one or more solvents selected from the following: dimethyl sulfoxide, pyrrolidin-2-one, glycerol formal, ethylene glycols and their mono/diethers, propylene glycols and their mono/diethers, and one or more components selected from the group consisting of: paraffin oils, waxes, surfactants, emulsifiers, one or more suspension stabilizing agents; wherein the suspension stabilizing agent is selected from the group consisting of polyvinyl alcohols, polyvinylpyrrolidones, xanthan gum, dextran, tylose, carboxymethylcellulose, ethylcellulose, methylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose and methylethylcellulose, wherein the phenyl phosphorodiamidate is present in an amount of 0.5-30% by weight, the oil(s) and/or fatty acid alkyl ester(s) are present in an amount of 50-99% by weight, and the surfactant is present in an amount of 0.1-10% by weight, 0.1-10% by weight of kerosene oil are present, 0.1-10% by weight of wax are present, the emulsifier(s) are present in an amount of 0.1-5% by weight, wherein the emulsifier(s) are nonionic surfactants and/or wherein the emulsifier(s) are fatty alcohols, fatty alcohol ethoxylates, alkyl polyglycol ethers, sorbitan fatty acid esters, polyglycerol esters of (poly) fatty acids, mono- and diglycerides of fatty acid or beeswax, and 0.05-5% by weight of one or more suspension stabilizing agents are present, in each case based on the total composition. and one or more components selected from the group consisting of: paraffin oils, waxes, surfactants, emulsifiers, one or more suspension stabilizing agents; wherein the suspension stabilizing agent is selected from the group consisting of polyvinyl alcohols, polyvinylpyrrolidones, xanthan gum, dextran, tylose, carboxymethylcellulose, ethylcellulose, methylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose and methylethylcellulose, wherein the phenyl phosphorodiamidate is present in an amount of 0.5-30% by weight, the oil(s) and/or fatty acid alkyl ester(s) are present in an amount of 50-99% by weight, and the surfactant is present in an amount of 0.1-10% by weight, 0.1-10% by weight of kerosene oil are present, 0.1-10% by weight of wax are present, the emulsifier(s) are present in an amount of 0.1-5% by weight, wherein the emulsifier(s) are nonionic surfactants and/or wherein the emulsifier(s) are fatty alcohols, fatty alcohol ethoxylates, alkyl polyglycol ethers, sorbitan fatty acid esters, polyglycerol esters of (poly) fatty acids, mono- and diglycerides of fatty acid or beeswax, and 0.05-5% by weight of one or more suspension stabilizing agents are present, in each case based on the total composition.