RU2728597C1 - Method for increasing productivity of winter wheat - Google Patents

Abstract

FIELD: agriculture.SUBSTANCE: invention relates to the agriculture. To increase winter wheat yield, the plants are treated with 2-(4-bromobenzyl sulphanyl)-4,6-dimethylnicotinonitrile in amount of 30 g/ha in the tillering phase and in the phase of the flag leaf.EFFECT: invention enables to achieve the specified purpose.1 cl, 1 tbl, 1 ex

Description

The invention relates to agriculture and can be used for growing wheat.

To increase the yield in modern agriculture, intensive technologies are used that involve the use of plant growth regulators - physiologically active substances of biogenic origin or synthesized artificially, which in small doses have a positive effect on the life processes of plants [1. Shapoval O.A., Mozharova I.P., Korshunov A.A. Plant growth regulators in agricultural technologies. Plant protection and quarantine. 2014. No. 6. S. 16-20]. The creation and use of growth regulators that reduce the pesticide pressure on plants and the environment is very important. The development of new active substances is carried out in various classes of chemical compounds, both in our country and abroad

The objective of the invention is to expand the arsenal of wheat growth regulators.

The technical result of the invention is to increase the yield of wheat.

This result is achieved by the fact that the method for increasing wheat productivity involves the treatment of growing wheat plants with a solution of 2- (4-bromobenzylsulfanyl) -4,6-dimethylnicotinonitrile of formula I:

in the amount of 30 g / ha in the tillering phase and 30 g / ha in the flag leaf phase.

2- (4-bromobenzylsulfanyl) -4,6-dimethylnicotinonitrile I is known in the literature [2. Strelkov V.D., Dyadyuchenko L.V., Dmitrieva I.G. Synthesis of new herbicidal sunflower antidotes. Krasnodar. 2014.96 p. 3. Pat. No. 2383135 dated 03/10/2010. Sunflower antidote to 2,4-dichlorophenoxyacetic acid], but its growth-regulating properties have been revealed for the first time.

The synthesis of the claimed substance was carried out by the authors by the interaction of 4,6-dimethyl-3-cyano-2 (1H) pyridinethione II with 4-bromo-benzyl bromide III according to scheme 1:

Scheme 1

In this case, 4,6-dimethyl-3-cyano-2 (1H) pyridinethione II was obtained by the interaction of the corresponding 64,6-dimethyl-2-chloronicotinonitrile with thiourea [4. Strelkov V.D., Dyadyuchenko L.V., Dmitrieva I.G., Isakova L.I. Synthesis and screening of herbicide antidotes on sunflower. Collection of materials of the International scientific and practical. Conf., dedicated to the 50th anniversary of VNIIBZR "Biological plant protection - the basis for stabilization of agroecosystems." 2010. S. 503-515].

Growth-regulating activity was determined according to the standard method [6. Guidelines for conducting registration tests of agrochemicals in agriculture. M: Ministry of Agriculture of the Russian Federation. 2018.217 p.].

The invention is illustrated by example.

Example 1. 2- (4-bromobenzylsulfanyl) -4,6-dimethylnicotinonitrile (compound).

To a suspension of 1.2 g (7.3 mmol) 4,6-dimethyl-3-cyano-2 (1H) -pyridinethione in 20 ml DMF add a solution of 0.41 g (7.3 mmol) KOH in a minimum amount of water and stirred until the precipitate is completely dissolved. Then a solution of 1.82 g (7.3 mmol) of 4-bromobenzyl bromide in 10 ml of DMF is added to the reaction mixture and stirred at room temperature for 1 h, the reaction mixture is diluted by half with water, and the precipitate formed is filtered off and dried. After recrystallization from a mixture of cyclohexane: ethyl acetate = 1: 1, 1.8 g (88%) of the target product 1 s are obtained in the form of crystals with m.p. 152-153 ° C.

Found,%: C 53.56; H 3.79; N 8.31. C ₁₅ H ₁₃ BrN ₂ S;

Calculated,%: C 54.06; H 3.93; N 8.41.

¹ H NMR spectrum, δ, ppm (group): 2.38 (s, 3H, 4-CH ₃ Py); 2.55 (s, 3H, 6-CH ₃ Py); 4.47 (s, 2H, SCH ₂ ); 7.12 (s, 1H, 5-H Py); 7.35-7.54 (m, 4H, Ar).

The assessment of the growth-regulating activity of the synthesized compound on winter wheat plants of the Grom variety was carried out in the experimental field of the All-Russian Scientific Research Institute of Plant Protection. The well-known growth regulator Retatsel, VK (State catalog of pesticides and agrochemicals permitted for use in the Russian Federation. Ministry of Agriculture of Russia. Moscow. 2019) was chosen as a standard. The standard was used in the amount recommended for wheat of 60 ml / ha.

Winter wheat plants of the Grom variety were treated with an aqueous solution of the synthesized compound twice in the tillering phase (dose 30 g / ha) and in the flag leaf phase (dose 30 g / ha) and Retacel, VC solution in the same phases (dose 60 ml / ha) with working fluid consumption rate of 300 l / ha.

Spraying was carried out using an OEMP-16 sprayer. The area of the experimental plot is 8 m ² , the replication is 4-fold, the placement of the plots is randomized. Wheat was harvested when the grain was fully ripe.

Growth-regulating activity was determined by increasing the grain yield of plants treated according to the proposed method and according to the reference method, in comparison with the control (untreated plants).

The data obtained are presented in the table.

Tests carried out on winter wheat made it possible to establish that the synthesized compound I, when applied twice at a dose of 30 g / ha, exhibits the properties of a growth stimulator.

Thus, the proposed invention realizes the specified purpose, providing an increase in wheat yield of 12.2 c / ha (21.4%), while the standard contributes to an increase in yield by 9.8 c / ha (17.3%).

Claims (3)

A method for increasing the yield of winter wheat, providing for the treatment of vegetative plants with 2- (4-bromobenzylsulfanyl) -4,6-dimethylnicotinonitrile of the formula I:

in the amount of 30 g / ha in the tillering phase and 30 g / ha in the flag leaf phase.