SU683601A3 - Method of controlling undesired plants - Google Patents

Description

(54) METHOD OF FIGHTING AGAINST UNDESIRABLE VEGETATION Example 1. The pre-emergence activity of a compound according to the proposed method was established in accordance with the following tests, in which a mixture of acetone and water (50:50 by volume) and a sufficient amount of the test compound providing the values shown in table. 1 amounts of the compound indicated per hectare were put in pots planted with seeds or sprouts of test species of plants. Potholes were prepared for herbicidal treatment as follows: 100 ml of soil were poured at the bottom of each plastic pod, then purple bindweed and oat seed were sown and covered with 50 ml of soil (from 1 to 1.37 cm). The seeds of the other eight plant species listed below were separately biased with the soil and this mixture was added to the pot in an amount of 50 ml. The pots were then lightly tamped down to level the soil and moistened with water before the herbicidal treatment. Such pre-moistening guaranteed a uniform distribution of the herbicidal solution over the soil surface in the pot and protected the weed seeds from damage by acetone. Each of the 10 weeds was placed on the scale of assessments. O-no action 1-possible effect 2-weak effect 3-moderate action 5-clear damage 6-herbicidal action 7- good herbicidal effect 8-approximation to full, 9-complete destruction 4- abnormal growth, i.e., a logical deformity is determined, but the total is less than in the case of an assessment of 5 estimates. Note: Based on measures, strength, x plants.

Example 2. The following experiments determined the post-emergence herbicidal activity of the compounds according to the proposed method. Monocotyledonic and dicotyledonic plants were treated with test compounds dispersed in an aqueous-acetone mixture. In these experiments, seedlings were grown in temporary boxes for two weeks. Test compounds were dispersed in mixtures of acetone and water (50:50) by volume, containing 0.5% Tween 20, polyoxyethylene (2) sorbitol-monolaurate as a surfactant.

The amount of dispersed test compounds was taken from the calculation for the preparation of the table. 2 quantities of active compound per hectare when sprayed onto plants through a nozzle operating under a pressure of 2.8 kg / cm for a given period of time. After spraying, the plants were placed on the shelves of the greenhouse and cared for, as usual, in accordance with current practice for growing plants in greenhouses. Two weeks after the treatment, the plant sprouts, with the exception of the wild oats, which grew a pot. Before chemical treatment, the pots were placed on pallets 25.4X30.4 cm in size. Sown pots were treated with 5 ml of the test solution and then placed on shelves in a greenhouse. After treatment, the pods were watered as needed and kept in the greenhouse for three weeks. In tab. 1 shows the results obtained. Plant species used in the assessment of pre-emergence herbicidal activity. Name Abbreviation Cygnus white LV Dick mustard Mar Abrosi Convolvulus purple Millet chicken Rosicka shelter on Bristles green Ovsyugi Limnokharis Wheat Rice Below is the rating system used in these experiments. Difference in growth from control experiments,% isostvia kal lennogo determining State, time, deformity of growth and appearance

Pre-emergence herbicidal activity of pyrazolium salts

for 5 weeks, examined and evaluated in accordance with the scale of estimates given in example 1.

In this experiment, the same plant species were used as in the experiments for determining the pre-emergence herbicidal activity in Example 1.

The results are presented in Table. 2

Example 3. Pre-emergence treatment.

The seeds of the experimental plants were sown in prepared soil in special pots and then the soil was treated with water-acetone solutions of active substances. After that, the pots were placed in a greenhouse and watered as needed. The results of the experiment were evaluated three weeks after treatment. The rating scale is similar to example 1.

The results of the experiment are presented in table. 3

Example 4. The post-emergence herbicidal activity of the proposed compounds was shown by the following tests, in which various monocotyledonous and dicotyledonous plants were treated with the test compounds dispersed in a water-acetone mixture. In these tests, plant seedlings were grown in trays.

for about 2 weeks. Test compounds are dispersed in 50/50 water-acetone (v / v) mixtures containing 0.5% Tween 20, polyoxyethylene (20), sorbitan monolaurate is a surfactant in an amount sufficient to provide such amount per hectare of the proposed compound, which is indicated in the table. 4, when applied to the plants with a spray nozzle, working under a pressure of 2.8 kg / cm for a predetermined time. After spraying the plants were placed on the benches of the greenhouse and cared for them in the usual way.

management of the usual practice of working in greenhouses. After 2 weeks after treatment, the plant seedlings, after the oats, which was evaluated after 5 weeks, were examined and evaluated in accordance with

evaluation system described in example 1.

The results of the experiment are presented in table. 4. Example 5. According to the method of example 3

Compounds of the present invention were tested against a known compound having a herbicidal activity 1.

The results of the experiment are presented in table. five.

Post-emergence herbicidal activity of pyrazolium salts

Pre-emergence herbicidal activity of 4-substituted pyrazolium salts. Post-emergence herbicidal activity of 4-zaischennyh

Pre-emergence herbicidal activity

Table 3

Table 5 Table4 pyrazolium salts

eleven

Claims (2)

1. US patent number 3882142, cl. 260-311, publ. 1974 (prototype). 2. Patent of the USSR No. 545242, cl. A 01N 15 9/22, convention priority 1974.