SU550956A3 - Herbicidal composition - Google Patents

Description

The invention relates to chemical means of controlling weeds by weeds in crops of cultivated plants, namely, to herbicidal compounds that contain the active substance and auxiliary components from among liquid or solid carriers, as well as surfactants. Herbicidal formulations containing nitrogen-containing heterocyclic dions as an active substance are known. For example, a composition containing 2 - aryl - 4 - methyl - 1,2,4 - oxadiazidione - 3.5 1 can be referred to as 1. 1 However, the known formulations of this type are not sufficiently effective. The aim of the invention is a new herbicidal composition based on nitrogen-containing heterocyclic dyons, which has a high herbicidal activity and selectivity of action. This goal is achieved by the fact that uretidinedions of the general formula I are used as the active ingredient of the formula I, where R and T {are the same or different and mean hydrogen, chlorine, lower alkyl; R may also mean an N-alkylcarbamoyloxy group. The composition according to the invention has a high herbicidal activity and can be used for the selective destruction of weeds in crops of wheat, barley, rye, oats, corn and soybeans. The recommended doses for these purposes are in the range of 1-4 kg / ha (according to the active substance). The usual form of application of the composition is solutions, emulsions, suspensions, powders. They are prepared by known methods that are common in the manufacture of pesticide formulations. The content of active substances in these forms is 0.1-99 wt. % The process for the preparation of compounds of general formula I is based on the reaction of the dehydrochlorination of the acid chlorides of the corresponding substituted allophanic acid derivatives using bases. Below are the compounds of formula I. 1.N - methyl - N - (3,4-dimethylphenyl) -uretidindione. 2.N - methyl - N - (4-chlorophenyl) -uretidindione. 3.N - Methyl - N - (3,4-dichlorophenyl) -retidindione.

Claims (2)

4.N - methyl - N - (m - isopropylcarbamoyloxyphenyl) - uretidindione. 5.N - methyl - N - (m - methylcarbamoyloxyphenyl) - uretidindione. Example 1. After-sewage application. Experimental plants 2–15 cm high were treated with compounds 1, 2 and 3 at a dose of 2 kg / ha. A well-known herbicide, 2 -. Methyl - 4 - chlorophenoxyacetic acid (compound A), also at a dose of 2 kg / ha, was used as a reference standard. All compounds were applied in the form of an emulsion at the rate of 500 liters of water per hectare. Accounting for herbicidal activity was carried out after 3-4 weeks - after treatment and expressed it as a percentage: O - no effect, 100 - complete death of plants. The results of the experiment are presented in table. 1. Table 1 Herbicidal activity, Example 2. Pre-emergence application. Seeds of experimental plants were sown into the soil and immediately after sowing they were treated with compounds 4 and 5 at a dose of 2 kg / ha (in the form of an aqueous dispersion). Accounting for herbicidal activity was carried out after 4-5 weeks after treatment and was evaluated as a percentage, similarly to example 1. The results of the experiment are presented in table. 2. Table 2 c) Experimental data indicate a high herbicidal activity of the proposed compounds. They are more effective than the famous herbicide used to control dicotyledonous weeds in crops, they have a better selectivity of action. Claims of the invention A herbicidal composition containing an active substance from the group of nitrogen-containing heterocyclic dons and auxiliary components from among liquid or solid carriers, characterized in that, in order to increase the herbicidal activity, the compound of the general formula -Y) -.-to is used as an active substance where R and R are the same or different and mean hydrogen, chlorine, lower alkyl; R may also mean N - alkylcarbamoyloxy, in an amount of from 0.1 to 99 weight. % The source of information taken into account in the examination of England Patent N 1142917, cl. From 07d, 1969 (prototype).