RU2298323C2 - Method for increase in sunflower productivity - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: claimed method includes treatment of vegetative sunflower plants with {1,2,4-triazole-[1,5-a]-pyrimidyl-2-thio}-4-fluoroacenanyl in amount of 200 g/hectare.

EFFECT: new method for increase in sunflower productivity.

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Description

The invention relates to agriculture and can be used in the cultivation of sunflower.

The objective of the invention is the expansion of the arsenal of sunflower growth regulators.

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

This result is achieved in that a method of increasing the yield of sunflower involves treating vegetative plants with {1,2,4-triazole- [1,5-a] pyrimidyl-2-thio} -4-fluoroacetanilide in an amount of 200 g / ha.

The synthesis of the active substance was first carried out by the authors according to the scheme

Synthesis technique.

1 g (0.0056 mol) of 1,2,4-triazole- [1,5-a] pyrimidyl-2-thiol was dissolved in 12 ml of dimethylformamide, a solution of 0.31 g (0.0056 mol) of KOH in 4 was added ml of water was stirred for 7-10 minutes, then a solution of 1.050 g (0.0056 mol) of chloroacetic acid 4-fluoroanilide in 8 ml of dimethylformamide was poured and stirred at room temperature for another 1 hour. After that, the reaction mass was diluted with 20 ml of H ₂ O, the precipitate formed was filtered off, washed with water, and dried. After recrystallization from ethanol, 1.05 g (58% of theory) of the target product with a _mp = 176-177 ° C were obtained.

An initial assessment of the growth-regulating activity of the synthesized compound was carried out at the experimental base of VNIIBZR on sunflower seedlings according to the following procedure.

Sunflower seeds were placed for 1 hour in solutions of the obtained compound of various concentrations. The seeds of the control were soaked in water. After 1 hour, the seeds were evenly laid out on strips of filter paper, rolled up and placed in glasses with water, then in a thermostat at 28 ° C. After 3 days, the length of the stem and root was measured. Growth-regulating activity was determined by increasing the length of the stem and root of the seeds exposed to the test substance, in comparison with the control. The measurement results were subjected to statistical processing. The data obtained are presented in table 1.

Table 1 Test results of the obtained compound for growth-regulating activity on sunflower seedlings Test object Concentration,% 10 ^-2 10 ^-3 10 ^-4 10 ^-5 BUT B BUT B BUT B BUT B compound obtained Root / hypocotyl 41/37 - / 6 31/32 - / - 35/36 - / 60 * 43/51 2/46 * The control 42/35

And - the average length of the root / hypocotyl, mm;

B - an increase in the length of the root / hypocotyl,%;

The differences are significant:

* - at P = 0.95;

Subsequently, the growth-regulating activity of the synthesized compound was determined under the conditions of a shallow field experiment using the TsINAO method. A well-known growth regulator of potassium humate V.R. was chosen as a reference. 20-25 g / l (List of pesticides and agrochemicals approved for use on the territory of the Russian Federation. Appendix to the journal "Plant Protection and Quarantine", 2002, No. 6). The standard was used in the recommended amount of 250 ml / ha for 2–3 leaves for sunflower.

Sunflower plants of the VNIIMK-8883 cultivar in a phase of 2-3 leaves were treated with an aqueous solution of the synthesized compound at a dose of 200 g / ha and a solution of potassium humate (250 ml / ha) with a working fluid flow rate of 300 l / ha. The experimental plot area is 5 m ² , the repetition in the experiments is fivefold. Harvesting of sunflower seeds was carried out during the period of complete ripening of seeds.

Growth-regulating activity was determined by increasing the yield of grain processed by the proposed method and the standard method of plants in comparison with the control (untreated plants). The results are presented in table.2.

table 2 Test results of the synthesized compound as a growth regulator on sunflower An object Dose g (ml) / ha Productivity Increase in control c / ha c / ha % Proposed 200 22.75 4.25 23 Reference 250 19.8 1.3 7 The control - 18.5 - -

Thus, the present invention implements the indicated purpose, providing an increase in the yield of sunflower 4.25 kg / ha (23%), while the standard helps to increase productivity by 1.3 kg / ha (7%).

Claims (1)

A method of increasing sunflower yield, comprising treating vegetative plants with {1,2,4-triazole- [1,5-a] pyrimidyl-2-thio} -4-fluoroacetanilide in an amount of 200 g / ha.