SU411818A1 - - Google Patents

Description

This invention relates to chemical agents for controlling undesirable vegetation in crops of cultivated crops. It is known to use ammonium substituted 4-amino-3,5,6-trichloropicolinates of the general formula C1 N COONCR XR as a herbicide) where R, R, R, R is an aliphatic radical with 1-9 carbon atoms, benzyl, carboxymethyl, unsaturated alkyl. However, the known herbicides do not have a sufficiently high selectivity of action with respect to cereals and cruciferous crops when weeding from dicotyledonous weeds. In order to enhance the herbicidal activity and selectivity of action, a herbicide is proposed that is iodomethyls and chlorohydrates of the substituted 4-amino-3,5,6-trichloropicolinic acid 4-amino-ethyl esters of the general formula -NH C, 1 1 C1 N СООСЕСНг «RiB de R, R, R - hydrogen, alkyl, substituted alkyl. Substances of this structure were obtained by deytviem on 4-amino-3,5,6-trichloroalkolinic acid chloride substituted by 2-aminotanol in dry dioxane. Some of these substances, studied as herbicides, have the following forums: А-А1 + С1 N СООСНГСНг ЛСгНэ) оксн. (sl) -5z

NH

CH9C1 CHj

SG N dooocHCHsii

NH2 xA /

11 (IV)

HCl

Cl COOCHCH2N (Cc; H5) ,, - 2H20

Nil,

x4 / Cl N COOH

The form of preparation of the drug is usual: in the form of a solution, dust, emulsion concentrate.

As a result of the experiments, it was found out that the proposed compounds in greenhouse and field conditions are highly toxic for indicator pea plants and exhibit selectivity of action in relation to cruciferous and cereal crops, since at doses causing a 50-80% reduction in the weight of the above-ground pea organs , they are practically non-toxic for mustard, oats and wheat.

Example 1. Pea and oat plants were treated with compounds I, I, III, IV and standard V in the form of 25 and 100 g / ha on peas and 1000 g / ha on oats. After three weeks, an account was taken of the herbicidal activity to suppress the growth of the above-ground plant organs as a percentage of the control.

The test results are presented in Table. one.

The phototoxicity of the proposed substances was studied under greenhouse conditions on pea and oat trust plants and in small-scale night field trials on peas, mustard and winter wheat.

Table 1

Peas were used as indicator plants. It is known that in the practice of selecting and evaluating new herbicides, the methods associated with the use of indicator plants, by their biological features close to the weeds, against which the herbicides are used, in this case to dicotyledon weeds, are increasingly used. The use of indicator plants has the advantage of avoiding a number of significant difficulties in the comparative evaluation of new chemicals on

natural clogging background (uneven background, accounting difficulties, difficulty in obtaining comparable results).

Mustard was used as a representative of the cruciferous family, which made it possible to judge the possibility in principle of using the proposed compounds for weeding crops belonging to the family (rutabaga, reps, cabbage). For toxicity of substances for oats and winter wheat

judged on the selectivity of substances in relation to cereal agricultural crops. Example 2. Pea and mustard plants in the 5-6 phase of present leaves and winter wheat in the tube release phase were treated

at a dose of 25-50 g / ha. Accounting for herbicidal activity was carried out on the yield of wheat grain and the weight of the aerial organs of peas and mustard.

Test results are presented in

tab. 2

Table 2 56

The subject matter of the invention is NHj Herbicide, which is iodomethyls and chlorohydrates of substituted p-aminoethyl esters of 4-amino- [3,5,6-trichloropicolinic acid of the general formula

411818

 R p. rppngnki ki 5 "-i-u- -uu nv njiN kk N where R, R, R is hydrogen, alkyl, substituted