SU731940A1 - Herbicidal composition - Google Patents

Description

The invention relates to chemical means for controlling weeds in cultivated plants, in particular, to herbicidal compositions based on mixtures of organic and inorganic compounds. Herbicidal compositions based on urea derivatives are known. These include, for example, the composition based on the wetting powder of linuron (N-3,4-dichlorophenyl-N-methyl-N-methoxyurea) J1. This composition is effective in crops of corn, cotton, soybeans, carrots, sugar beet potatoes. It is known that ammonium nitrate supplemented with thiosulfate is used as a defoliant and desiccant 2. For the same purpose, it is recommended as a component mixed with salts or esters of 2,4-dichlorophenoxyacetic acid and trialkyltetrathiophosphate 3. Despite the high efficiency of linuron, its use is relatively expensive. In addition, its recommended doses for weed infestation in carrot and potato crops are high and pose the danger of unsteady quantities of the herbicide in cultivated plants. The purpose of the invention is a new herbicidal composition based on linuron, which has the highest efficiency when used in crops of potatoes and carrots. This goal is achieved in that an ammonium nitrate () is added to a linuron-based herbicide (N-3,4-dichlorophenyl-N-methyl-N-methoxyurea) of the formula -NHCr i H pgm O. The herbicidal composition according to the invention contains the following components, wt.%: N-3,4-dichlorophenyl-N-methyl-N-methoxy0, 04-0.50 urea Ammonium nitrate The rest is up to 100%

Linuron taken in the form of a wettable powder. Consumption of working solution 200-600 l per-1 ha of crops.

The working solution is prepared before processing as follows.

Take the required amount of ammonium nitrate, add water until complete dissolution, add linuron and add water to the specified volume.

The resulting mixture is applied before the appearance of seedlings of cultivated plants. The young weeds that had reached this time are destroyed by the herbicidal composition.

The greatest effect is achieved when using the proposed mixture in dry weather, in the absence of rain for 2-3 hours after treatment.

In potato plantations, processing is carried out 1-5 days before the emergence of cultivated plants. By the time the seedlings appear, the majority of the annual weeds, which are completely destroyed, are germinating. In the future, the timely holding of two inter-cultivation with hilling of plants ensures the purity of the crops to the end of the vegetative period. Reducing the dosage of linuron several times leads to a sharp decrease in its residues in production.

In carrot crops, processing is carried out 1-3 days before the emergence of cultivated plants. Virtually all annual weeds that have sprouted by this period are destroyed. The dosage of linuron is reduced by 3-6 times. The second treatment of crops is carried out in the phase of 2-3 present leaves in carrots using linuron in usual doses.

Thus, the total dosages of linuron are reduced by 30-40%.

Example 1. The processing of carrot crops is carried out 2-3 days before the appearance of the seedlings of cultivated plants. Crops are littered mainly with lice, white maria, mountaineer rough and shepherd's bag. By the time of processing, weeds are in the phase of the seed lobes - one true leaf.

Consumption of working solution 400 l / ha. The results of the experiments are presented in table. one.

Table 1

The interaction of linuron and ammonium nitrate is synergistic. The combined use of linuron at a dose of 0.25 kg / ha for the active substance - a. (0.125 wt.%) With ammonium nitrate at a dose of 37.5 kg / ha (9.4 wt.% Provides the same effect as in the case when this herbicide is used in the usual dose of 2 kg / ha in d. c. (prototype). The use of linuron in a dose of 0.5 kg / ha in ai (0.25 wt.% in combination with ammonium nitrate in doses of 37.5 kg / ha (9.4 wt.%) causes complete death of juvenile weeds. In this example, the upper limit of the ratio of linuron and ammonium nitrate is 0.25 and 9.4 wt.% (complete weed loss), and the lower is 0.062 and

18.8. The optimal ratio of ingredients is 0.125 and 9.4.

In none of the variants of experiments was the depression of cultivated plants noted.

5 Example 2. Planting potatoes is treated for 1-2 days before the appearance of seedlings of cultivated plants. Crops are clogged in the basis of wood lice, white mary, chamomile fragrant, mountaineer rough and shepherd's bag. Weeds are in phase from seed of long leaves to second true leaf at the time of processing. Consumption of working solution 400 l / ha.

5 The results of the experiments are presented in table. 2

table 2

Continued table. 2

The combined use of linuron at a dose of 0.5 kg / ha in the a. (0.25 wt. With ammonium nitrate in a dose of 75 kg / ha (18.8 wt.%) Ensures the death of over 99% of young weeds, i.e. as much as in the case of using linuron in the usual dose of 2 kg / ha in dv (prototype). In this case, the interaction of linuron and ammonium nitrate has a well-developed synergism. Inhibition of cultivated plants was not observed in any of the experimental variants. In this example, the upper limit of the ratio of linuron and ammonium nitrate is 0 , 5 and 6.4 wt.% (Almost complete loss of COJPHHKOB), and the bottom 0, 125 and 18.8. The optimal ratio is specified x ingredients 0.25 and 18.8. Example 3. Planting potatoes is processed 3-4 days before the emergence of crop plants. Crops are littered with moss and white mart. Weeds are in the phase from the long leaves to the first The consumption of the working solution is 300 l / ha, the results of the experiments are presented in Table 3. Table 3

The combined use of linuron in a dose of 0.125 kg / ha in dv (0.083 wt. With ammonium nitrate in a dose of 100 kg / ha (33 wt.%) Ensures the death of over 97% of young weeds, i.e. there is almost complete weed plant suppression. Over 97% of weeds also die in the case of the use of NIN of linuron at a dose of 0.0625 kg / ha for ai (0.042% by weight) and ammonium nitrate, at a dose of 150 kg / ha (50 weight. %).

In this example, the upper limit of the ratio of linuron and ammonium nitrate is 0.167 and 33 wt.%, And the lower limit is 0.042-50. The optimal ratio of these ingredients is 0.083 and 33.

Continued tab. 3

None of the experience of oppression of cultivated plants was observed.

Example 4. Crops of carrots are processed for 1–2 days before the appearance of seedlings of cultivated plants. Crops are littered with lice, mountaineer rough white mary, pickle, shepherd's purse, wild radish and chamomile. By the time of processing, weeds are in the phase of the seed lobes - one true leaf.

Consumption of working solution 600 l / ha

The results of the experiments are presented in table. four.

Table 4

635100

O 489 77.0

18.6 494 77.8

21.5 58 40.6

91.0

The interaction of linuron and ammonium nitrate is synergistic. The combined use of linuron at a dose of 0.125 kg / ha in the a. (0.042 wt.%) With ammonium nitrate at a dose of 50 kg / ha (8.33 wt.%) Ensures the death of 97% of weeds, and the weight of the remaining weeds is only about 6% of the control. The combined use of linuron at a dose of 0.5 kg / ha in the a. (0.167 wt.%) And ammonium nitrate at a dose of 37.5 kg / ha (6.25 wt.%) Provides the same effect as in the case of the use of the herbicide in the usual dose of r - 2 kg / ha in D. c. (prototype).

Inhibition of cultivated plants in any of the options is not marked.

Continued table. four

In this example, the upper limit of the ratio of linuron and ammonium nitrate is 0.167 and 6.25 wt.%, And the lower LI is 0.042 and 6.25. Optimal

the ratio of these ingredients 0,083 and 6.25.

Example 5. Planting potatoes is treated for 2-3 days before the appearance of seedlings of cultivated plants. Wood lice dominate in weeds. By the time of processing, weeds are in the phase of the seed lobes - one true leaf. Consumption of working solution 400 l / ha.

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

Table 5 In this example, the interaction of linuron and ammonium nitrate has the character of a well-pronounced synergy. The combined use of linuron at a dose of 0.062 kg / ha in dv (0.031 wt.%) With ammonium nitrate at a dose of 50 kg / ha (12.5 wt.%). Provides suppression over 96% of weeds. The use of linuron in a dose of 0.125 kg / ha for the ai. (0.063 wt.%) With ammonium nitrate at a dose of 50 kg / ha (12.5 wt.%) Causes complete death of weeds. In this example, the upper limit of the ratio of linuron to ammonium nitrate is 0.125 and 6.25 (in wt.%), And the lower continuation table. 5% - 0.031 and 12.50. The optimal ratio of ingredients is 0.063 and 6.25. Inhibition of cultivated plants was not observed in any of the variants of experiments. Example 6. Crops of carrots are treated for 1-2 days before the appearance of seedlings of cultivated plants. Crops are clogged mainly with white marica, highlander rough, radish wild and wood lice. Weeds are in phase from seed of long leaves to the first true leaf at the time of processing. Consumption of working solution 600 l / ha. The results of the experiments are presented in table. 6. Table 6

Continued table. 6

Claims (1)

Claim A herbicidal composition containing N-3,4-dichlorophenyl-P-methyl-M ^ _methoxy _ urea of the formula CE as an active substance and water, characterized in that, in order to enhance the herbicidal activity, 35 it additionally includes ammonium nitrate in the following ratio of components, wt.%: N-3,4-Dichlorophenyl-H-methyl-Y ^ methoxyurea Ammonium nitrate Water 0.04-0.50 4-50 Rest