SU493217A1 - Herbicide - Google Patents

Description

This invention relates to chemical agents for controlling undesirable vegetation in crops of cultivated crops. The terbncid of the structural formula C N - is known. However, this herbicide does not possess sufficiently high herbicidal activity and selectivity of action. In order to enhance the herbicidal activity and selectivity of action, a herbicide is proposed that is derived from 2 alkylthio-4, 6-1b1c-alkyl (dialkyl) amino-symmetry with the general formula: SCHjC CR R-. N Ri In which R and Ri may be the same or different and mean an alkyl, or dialkylamino group; R is hydrogen, hydroxymethyl or 2- (4,6-bis-alkyl (dialkyl) amino-sym-triazinyl) -thiomethyl. Example 1. For initial evaluation, the preparation was tested under greenhouse conditions using a nose-emergence treatment method. Drugs in the form of an aqueous emulsion were sprayed at different doses with a test — plants in the phase of 3-4 leaves. The determination of the height of the plants and the weight of their green mass were carried out 14 days after spraying. The test results are shown in Table. 1. All tested representatives of 2-alkylthio4 .6-alkyl (dialkyl) amino-symmetry-triazine of this group have a biological activity, and the first two drugs have a stimulating effect on the growth of wheat plants and beans, and the rest inhibit the growth of test plants or cause their doom Example 2. In order to clarify the selectivity of the effect, additional tests were carried out on 6 species of cultivated plants and on 5 species of weeds by means of pre-emergence and post-emergence spraying. When pre-emergence of the drug was applied to the soil immediately after sowing, and the weight of green mass of plants was taken into account 21-30 days after sowing. Post-harvest treatment with the preparations and recording of the results was carried out in the same manner as described in Example 1.

The test results are shown in Table. 2

The tested preparations are highly selective with pre-emergence application: they caused 1-year-old weeds to die in doses of 1 kg / ha (Marie white, mustard, mountaineer spreading, pyrits and bristles; in a higher dose they did not damage corn, cotton, sunflower, peas, and wicked and fodder beans.

Example 3. The duration of the effect of the preparations in the soil was studied by growing a test plant on the soil into which the preparation was previously applied. As a biological indicator, oats were used, which were grown h & 1, 3, 5 and the biological activity of the derivatives

General formula:

7 months after applying the drug to the soil. The effect of the drug was determined by reducing the weight of the above-ground mass of oats, including the weight of the second leaves (see Table 3).

The drug was completely inactivated within 5 months.

Example 4. The seeds of corn plants, Piritsa, portulac, and bristles were sown in the soil, which was treated with standards I and II at a dose of 1 and 2 kg / ha before the emergence of seedlings. After 2 weeks, we recorded the herbicidal activity in% of the Control and the yield in kg / ha.

The results are presented in table. four.

Table 1

.i N

R. N

R. -2-alkylthio-4,6-bis-alkyl / dialkyl / amino-snmm-triazines

Selectivity of the herbicidal action of -2-alkynylthio-4,6-bis-alkyl (dialkyl) derivatives

amino-simm-triazine

a) pre-emergence application

table 2

b) post-harvest application. Note. Evaluation of the herbicidal effect of 5-plant death

493217

Continued table. 2

Table 3

Green mass,% of control

T and l and c and 4 in points: O-does not have a herbicidal effect;