1. A herbicidal composition comprising, as active ingredients, (a) nicosulfuron or its salt, b) terbuthylazine or a salt thereof, and (c) Compound C (Compound C represents at least one herbicidal compound selected from, the group consisting of group C1 and group C2, or a salt thereof group C1 comprises at least one inhibitor 4-gidroksifenilpiruvatdioksigenazy selected from the group consisting of sulcotrione, bitsiklopirona, mesotrione, topramezone, and the salts thereof, and the group C2 represents at least one ingib Ithor fatty acid biosynthesis from very long chain, selected from the group consisting of dimethenamid-P, flufenacet and their salts) .2. The herbicidal composition according to claim 1, wherein the mixing ratio of (a) to (b) is from 1:. 0.5 to 1: 800 by weight, and the mixing ratio of (a) to (c) is from 1: 0.03 up to 1: 800 by masse.3. The herbicidal composition according to Claim. 1, wherein (c) is at least one 4-gidroksifenilpiruvatdioksigenazy inhibitor selected from the group consisting of sulcotrione, bitsiklopirona, mesotrione, topramezone and soley.4. The herbicidal composition according to Claim. 1, wherein (c) represents at least one inhibitor of the biosynthesis of fatty acids with very long chain selected from the group consisting of dimethenamid-P, flufenacet and soley.5. The herbicidal composition according to Claim. 1, wherein (c) is at least one member selected from the group consisting of sulcotrione, bitsiklopirona, topramezone, dimethenamid-P and their soley.6. The herbicidal composition according to Claim. 1, wherein (c) is at least one member selected from the group consisting of sulcotrione, bitsiklopirona, dimethenamid-P and their soley.7. A method for killing undesired plants or inhibiting their growth, which comprises n1. Гербицидная композиция, содержащая, в качестве активных ингредиентов, (а) никосульфурон или его соль, b) тербутилазин или его соль и (с) соединение С (соединение С представляет собой по меньшей мере одно герби
