RU2542759C2 - Method of protecting vegetating sunflower plants from damaging impact of 2,4-dichlorophenoxyacetic acid - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to agriculture. To protect vegetating sunflower plants from injuring impact of 2,4-dichlorophenoxyacetic acid they are treated with 2-triphenylmethylthio-4,6-dimethyltriazolo-[1,5-a]pyrimidine in amount 200 g/ha one day after herbicide application.

EFFECT: invention makes it possible to increase sunflower yield.

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Description

The invention relates to a technology for the protection of cultivated plants from the damaging effects of herbicides.

There is a method of protecting vegetative crops from the damaging effects of herbicides, providing for their treatment with an antidote after using the herbicide (Pitina M.R. et al., Current level and perspective directions of crop protection from undesirable effects of the use of herbicides // Agrochemistry, 1986, No. 4, p. 107-136).

The objective of the invention is to expand the arsenal of antidotes for sunflower from the damaging effects of 2,4-D.

The technical result of the invention is the protection of vegetative sunflower plants from the damaging effects of 2,4-D, which is expressed in an increase in yield compared to a herbicide-treated control.

This result is achieved by that in a method of protection of growing plants from the damaging effect of 2,4-D, providing for processing them after use safener herbicide according to the invention as antidote is 2-triphenylmethylthio-4,6-dimetiltriazolo- [7,5- a ] pyrimidine of the formula I:

в количестве 200 г/га через 3 суток после использования гербицида.

in an amount of 200 g / ha 3 days after using the herbicide.

The synthesis of the antidote was first carried out by the authors according to the scheme:

Synthesis Method

To a suspension of 0.7 g (3.9 mmol) of 4,6-dimethyltriazolo- [1,5- a ] pyrimidin-2 thiol in 10 ml of DMF is added a solution of 0.22 g (3.9 mmol) of KOH in a minimum amount of water , stirred at room temperature for 10 minutes, then a solution of 1.09 g (3.9 mmol) of triphenylchloromethane in 10 ml of DMF was added and stirring was continued for another 2 hours. The reaction mixture was diluted with water twice, the precipitate that formed was filtered off, washed with water and dried. After recrystallization from ethanol: DMF = 3: 1, 1.30 g (80%) of the desired product I are obtained in the form of crystals with a melting point of 201-202 ° C.

Found,%: C 73.66; H 5.12; N 13.41; C ₂₆ H ₂₂ N ₄ S.

Calculated,%: C 73.90; H 5.25; N, 13.26.

¹ H NMR spectrum, δ, ppm (group): 2.58 (s, 3H, 4-CH ₃ Py); 2.78 (s, 3H, 6-CH ₃ Py); 6.42 (s, 1H, 5-H Py); 7.08 ... 7.36 (m, 15H, Ar).

The antidote activity of the obtained compound in sunflower plants was evaluated on the experimental field of the All-Russian Research Institute for Plant Biological Protection. As a prototype used the well-known antidote 2,4-D - sulfalene (List of pesticides and agrochemicals approved for use on the territory of the Russian Federation. Appendix to the journal "Protection and Quarantine of Plants", 2002, No. 6). The standard was used in the recommended amount for sunflower 200 g / ha at a flow rate of 500 l / ha.

Evaluation of the antidote activity of the claimed compound I and prototype (sulfalene) was carried out according to the following method.

In the field, sunflower plants of the VNIIMK 8883 cultivar were treated with 2,4-dichlorophenoxy-acetic acid butyl ether at a dose of 18 g / ha in a phase of 10-16 leaves and an antidote solution at a dose of 200 g / ha with a flow rate of 500 l was applied a day later / ha.

In the experiment, the following options are provided:

- control - untreated plants;

- “herbicide” (standard) - plants treated with a herbicide;

- “herbicide + antidote” - plants treated with herbicide and antidote.

The experiments were carried out on plots with an area of 2.8 m ² , five repetition. Harvesting of sunflower seeds was carried out at the time of complete ripening of seeds.

The antidote effect was determined by the absolute value of the yield increase to the herbicidal standard and in percentage by the formula:

, $$A_x=\frac{\mathrm{BUT}-E}{E}\times \mathrm{one}00$$

,

A _x - antidote effect,%;

A - crop in the variant antidote + herbicide;

E - crop in the standard version (herbicide).

The data obtained are statistically processed using t-student test.

The test results are presented in the table.

Table Antidote activity of 2-triphenylmethylthio-4,6-dimethyltriazolo- [1,5- a ] pyrimidine (compound I) and prototype (sulfalene) in relation to 2,4-D on sunflower Antidote Dose of antidote, g / ha Experience Options 2,4-D (herbicide) 2,4-D + antidote Productivity c / ha Productivity c / ha Antidote activity c / ha % Compound I 200 17.1 22.1 5,0 29 * Sulfalen (prototype) 200 17.1 20.1 3,1 eighteen The control - 40.6 - - -

The differences between the variants are significant at P = 0.90.

Thus, the present invention allows to provide an antidote effect at the level of 29% against 18% in the prototype, which increases the yield of sunflower by 5.0 kg / ha.

When studying the possibility of protecting sunflower from the negative effects of 2,4-D depending on the dose and the application period after many experiments, it was found that the optimal period for applying the antidote is 1 day after exposure to the plants with the herbicide and the optimal dose is the antidote dose of -200 g / ha .

Claims (1)

A method for protecting vegetative sunflower plants from the damaging effects of 2,4-dichlorophenoxyacetic acid, which comprises treating them with an antidote after using a herbicide, characterized in that 2-triphenylmethylthio-4,6-dimethyltriazolo- [1,5-a] pyrimidine of the formula are used as an antidote I:

in an amount of 200 g / ha a day after using the herbicide.