SU460605A3 - Herbicide - Google Patents

Description

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

The use of nitrogen-containing compounds, for example, derivatives of urea, thiourea, iso-urea or isothiourea as herbicides, is known.

The compounds of this group possess high herbicidal activity, however, some weed species are resistant to them. It is proposed to use 1-hydroxy-2-phenyl3, 3-dimethylguanidine as a new selective epicidium.

The proposed compound can be used as a continuous or selective herbicide. Effective doses are 0.5–20 kg / ha, preferably 5–10 kg / ha.

This compound can be used both before and after plant emergence.

Forms of application of the compound conventional - solutions, powders, pastes, emulsions, granules. They are prepared by known methods. In order to broaden the spectrum of action, the proposed compound can be used in combination with other biologically active substances.

The method of obtaining the proposed compound is based on the interaction of hydroxylamine with N-phenyl-N, N, 0-trimethyl isophenol in the presence of alcoholic alkali.

Example 1. Under field conditions

Beet crops were treated with 1-hydroxy-2phenyl-3, 3 - dimethylguanidine (compound 1) before and after the emergence of shoots.

The treatment was performed with a 50% preparation with doses of 5 and 10 kg / ha per drug. Accounting for herbicidal activity was carried out 8 weeks after the emergence of the beet plants and was assessed according to the nin-point scale shown in Table 1.

Table 1

Action on plants

h h

weed

beet

sh

No damage

stenius

Separate damage marks

Weak growth retardation

Moderately slow growth or destruction of 15% of leaf mass

Strongly slowed growth or destruction of 30% of leaf mass

The destruction of 50% of the mass of leaves

Very strong slow growth or destruction of leaf mass

Embedded Almost full of death

Full of death plants

For comparison, the well-known commercial hesiticides were used: benzthiazuron - powder for pollination (compound A); The phyamifacam emulsifiable concentrate (compound B).

The test results are shown in Table 2 (pre-emergence application) and Table. 3 (noslevskhodovy application).

The repetition of the experiment is threefold (I-III).

Experimental data indicate the effectiveness of the proposed compound: it has a high herbicidal activity and is selective for crop plants.

table 2

 Mar, snotka, woodlouse, chamomile, buckwheat, shepherd's purse, cereal weeds.

Subject invention

The use of 1-hydroxy - 2 - phenyl - 3,3 - dimethylguanidine as a herbicide.

Table 3