SU341199A1 - - Google Patents

Description

The invention relates to chemical means for controlling weeds in crops of cultivated plants.

Widely known is the use of various simm-grkazin derivatives as herbicides. Herbicides of this type are effective in the chemical weeding of many cultivated plants; however, some weeds are very resistant to them. In addition, well-known herbicides from the class of smzh.lg-triazines in practicable doses damage some cultivated plants.

It is proposed as a selective herbicide to use derivatives of sym-triazine of general formula

HzN-Jl-NH-C (CH5) j

where X is chlorine, methoxy or methylthio.

for example, for corn, wheat, oats, cotton, and some vegetables, crops.

The usual uses of these compounds: solutions, emulsions, suspensions, powders or granules, are prepared by their known methods. The content of active substances in preparative forms can be 0.1-95 wt.%. Effective doses of the compounds according to the invention for the selective destruction of weed plants are 0.2-6 kg / ha, preferably 0.3-4 kg / ha.

To enhance the effectiveness of the proposed herbicide and to expand the spectrum of its action, it can be used in a mixture with other biologically active substances.

The method of obtaining compounds specified

formulas based on the interaction of the corresponding chlorine-containing substances, their symmetry-triaznnom with

tert-butylamine, sodium methylate or sodium methyl mercaptide.

Below are listed the compounds corresponding to the formula given, being studied as a herbicide.

1. 2-Amino-4 - tert - butylamino-6-chloro-syzh.mtriazine.

Example 1. Pre-emergence application.

Seeds of experimental plants are sown in the prepared soil and one day after sowing they are treated with the preparative forms of compounds 1, 2 and 3 in doses of 0.5-3 kg / ha for the active substance.

The herbicidal action is taken into account 20 days after sowing and is evaluated on a nine-point scale: 1 — no damage; 9 - full of death of the plant.

As a reference, well-known substances are used for comparison: 2-amipo-4-isopropylamino-6-methoxy-Cf-triazine (compound A) and 2-amino-4-isopropylamino-6-chloro-syl1-itriazine (compound B). The test results are presented in table. 1 and 2.

Table 1

Example 2. Post-harvest application.

Experimental plants in the stage of development of 2-3 leaves are treated with compounds 1 and 2 in doses of 0.75-3 kg / ha and 8-10 days after treatment take into account the herbicidal activity

table 2

Analogously to example 1 on dev

scale.

As a reference, well-known substances are used for comparison: 2-ethylamino-4-isopronylamino-6-chloro-silzh-triazine (compound B) and compound B. Test results

are presented in table. 3 and 4.

Table 3

The results presented in table. 1-4, indicate a high herbicidal activity and selectivity of the effect of the proposed compounds. Thus, compound 1 has a wider spectrum of action than the known compound B, completely suppressing the growth of such a common weed plant as a rossick. Compounds 2 and 3 are also superior in herbicidal action to known substances of this type.

Table 4

Subject invention

The use of derivatives syl / W-triazine General formula

HjN-J-NH-C (CHj.) 3

where X is chlorine, methoxy group

or methylthio, as a herbicide.