RU2298322C2 - Method for increase in sunflower productivity - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: claimed method includes treatment of vegetative sunflower plants with 2,4,5,6-tetrachloro-3-(N-benzyl)-pyridinecarbamide 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 for increasing sunflower yield involves treating vegetative plants with 2,4,5,6-tetrachloro-3- (N-benzyl) -pyridine carbamide 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.

To a solution of 0.6 g (0.006 mol) of benzene amine and 0.5 g of triethylamine in 20 ml of dry benzene was added a solution of 1.4 g (0.005 mol) of tetrachloro nicotinic acid chloride and heated at 80 ° C for 6 hours. The reaction mass was cooled, the precipitate was filtered off, washed with water, dried and recrystallized from acetonitrile to obtain 1.3 g (75% of theory) of the product. T _pl. = 211-212 ° C.

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

Sunflower seeds are placed for 1 hour in solutions of the claimed compounds. The seeds of the control option are 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 The test results of the claimed compounds for growth-regulating activity on seedlings of sunflower Test object Concentration,% 10 ^-2 10 ^-3 10 ^-4 10 ^-5 BUT B BUT B BUT B BUT B The resulting compound, root / hypocotyl 108/60 fifteen**/- 132/62 40 * / - 120/65 28 * / 2 88/61 - / - The control 94/64 A - the average length of the root / hypocotyl, mm B - 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 permitted 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 mg / ha for sunflower in the phase of 2-3 leaves.

Sunflower plants of the VNIIMK-8883 cultivar in the 2-3-leaf phase were treated with a solution of the synthesized compound in an amount of 200 g / ha and a potassium humate solution of 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 grain yield of the plants treated with the synthesized compound and the standard in comparison with the control (untreated plants). The results are presented in table 2.

table 2 Test results of synthesized as a growth regulator on sunflower An object Dose g (ml) / ha Productivity, t / ha Increase in control c / ha % Proposed 200 29.8 8.3 38.6 Reference 250 26.5 5,0 23.3 The control - 21.5 - -

Thus, the present invention implements the indicated purpose, providing an increase in the yield of sunflower by 8.3 kg / ha (38.6%), while the standard helps to increase productivity by 5 kg / ha (23.3%).

Claims (1)

A method of increasing sunflower yield, comprising treating vegetative plants with 2,4,5,6-tetrachloro-3- (N-benzyl) -pyridine carbamide in an amount of 200 g / ha.