CS252503B1 - Plant growth regulating agent - Google Patents

Abstract

The solution relates to a composition for regulating plant growth, for increasing the yield and technological quality of plants, containing as an active ingredient at least one substituted 2-oxobenzothiazoline of the general formula I in which X means hydrogen or chlorine, R means methyl, cyano, methoxy, halogen, n means 0 to 3.

Description

The invention relates to a composition for regulating plant growth, for increasing the yield and technological quality of plants, which contains as an active ingredient substituted 2-oxobenzothiazolines of the general formula I

=0

CH^COO-CH ₂

IR) (/) in which

X represents a hydrogen or chlorine atom,

R stands for halogen, methyl, cyano, methoxy.

n is 0 to 3.

The above compounds can be prepared by the method described in Czech Patent Application No. 252 502 and Czech Patent Application No. 245 866.

It is known that some substituted 2-oxobenzothiazolines are characterized primarily by herbicidal and fungicidal activity [D'Amico J. ].: USA pat. 4187 098 (1977J; Nedá I.: Jap. pat. 92956 (1979); Jap. pat. 105 605 (1980); Cs. pat. 172 118 (1974)]. It is also known that some 2-oxobenzothiazolines have the ability to increase the sugar content in sugar-producing crops [D'Amico J. J.: USA pat. 576512 (1975)].

It is known that as growth regulators, mainly substances derived from natural growth regulators of phytohormones are used, however, the use of various synthetic substances is also intensively developing, which can significantly influence the metabolic processes of plants and ultimately change the qualitative and technical-economic parameters of crops, especially the height and quality of the harvest. Especially important are those whose desired regulatory effect is not dependent on climatic conditions and can be applied in a conventional manner according to previously developed methodologies, do not require a change in agricultural technology, their application doses are usually in the range of several grams per ha, do not cause negative consequences, such as undesirable residues, etc.

It has now been found that some of the shortcomings of existing control agents can be overcome by the plant growth control agent according to the invention, for increasing the yield and technological quality of plants.

The essence of the invention lies in the fact that it contains as an active substance at least one substituted 2-oxobenzothiazoline of the general formula:

in which

X represents a hydrogen or chlorine atom,

R means halogen, methyl, methoxy, cyano, n means 0 to 3.

The composition according to the invention can be used for agricultural and horticultural purposes as such or in admixture with processing aids which improve the effect of the composition according to the invention or which stabilize the composition depending on the purpose of its use. The composition according to the invention can be used, for example, in the form of powder, microgranules, granules, wettable powder, liquid suspension concentrates, ultra-low volume composition or in the form of emulsifiable concentrate, prepared by methods generally used in. pesticide production.

In practical use, these various types of compositions according to the invention can be used as such or after dilution with water to a suitable concentration.

The term "processing aids" here always refers to carriers (diluents) and also dispersants, emulsifiers, wetting agents, dispersants, binders, fillers, disintegrators and similar substances.

Liquid carriers are always understood to mean petroleum fractions such as kerosene and light oil, aromatic hydrocarbons such as toluene and _xylene , alcohols such as methanol, butanol, glycol, ketones such as dimethyl sulfoxide, methylnaphthalene, cyclohexane, animal and vegetable oils, fatty acids, fatty acid esters and similar carriers.

Solid carriers are always understood to include clay, kaolin, talc, diatomaceous earth, silicon dioxide, calcium carbonate, montmorillonite, bentonite, feldspar, quartz, alumina, sawdust.

Surfactants are used as emulsifiers or dispersants. Surfactants include anionic, cationic, nonionic and amphoteric surfactants, such as sodium salts of higher alcohol sulfates, stearyl trimethyl ammonium chloride, polyoxyethylene alkyl phenyl ethers and lauryl betaine and others.

The above-mentioned types of composition of the invention can be used alone, or they can be applied to the soil or to the destination in the form of a mixture with fertilizers or other agricultural or horticultural preparations.

When used in the above-mentioned forms, the concentration of active ingredients of the composition according to the invention can vary depending on the form of the composition and the processing aids used and is generally 4-95% by weight. For different types of composition, the preferred content of active ingredients can vary. For example, in the case of a powder, the content of active ingredients is 4-20% by weight and of excipients 80-96%; in the case of an emulsifiable concentrate, the content of active ingredients is 5-40% and of excipients 60-95%; in the case of liquid suspensions and concentrates, the content of active ingredients is 5-40% and of excipients 60-95%; in the case of a wettable powder, the content of active ingredients is 20-80% and of excipients 20-80%; in the case of granules and microgranules, the content of active substances is 4 — — 10% and auxiliary substances 90 — 96%.

The examples given illustrate, but do not limit, the subject matter of the invention.

Active ingredients used according to the invention:

A j 3-(benzyloxycarbonylmethyl)-4-chloro-2-benzothiazolinone

B) 3-(benzyloxycarbonylmethyl j -2-benzothiazolinone

C) 3-(4-chlorobenzyloxycarbonylmethyl)-4-chloro-2-benzothiazolinone,

D j 3-(3,4-dimethylbenzyloxycarbonylmethyl j -4-chloro-2-benzothiazolinone,

E j 3-(4-methoxybenzyloxycarbonylmethyl j -4-chloro-2-benzothiazolinone,

F'j S-H-cyanobenzyloxycarbonylmethyl)-4-chloro-2-benzylthiazolinone.

Example 1

Seeds of test plants were sown in rows in PVC containers measuring 30.5 cm XX 38.5 cm X 4 cm, filled with loamy sandy soil. The active substances, prepared as 5% EC and diluted with water, were applied either before the emergence of plants on the soil surface or after emergence to plants at the stage of the first two washed leaves of dicotyledons and two leaves of monocotyledons. The volume of the application solution corresponded to a volume of 800 l. ha ^-1 . After the symptoms were marked, the morphoregulatory effect was evaluated so that 0 means normal plants, + plants with slight growth and morphological changes and + + plants with significant growth and morphological changes. The results are shown in Table 1.

Table 1.

Growth and morphoregulatory effects of substances A and B during pre-emergence and post-emergence application

Application rate in kg acc. 1

Test object Pre-application Post-application kg. ha ¹ 1 kg. ha ¹

A B A B

Beta vulgaris + ' + ·+ + Brassica napus + 1+ 4- + 4· Vicia sativa + ! + + 1 + + Buckwheat + + H- + ^; + +'+ Sinapis alba + + '+ 4- + 4-4* Pisum sativum 4- 1 + 4- + 4" Hordeum sativum 0 0 0 0 Example 2 about 0 9 cm . Seeds were placed on the discs- buckwheat 30 pieces per bowl in 3 batches Z 5 θ/o EK of substance A with dilution distilled- tions. After 5 days of incubation at 21 °C with water, they prepared graded final measured the length of the shoots and roots, count- trations that are in 4 : ml volumes applied they averaged the values and calculated the % con- on filter discs paper in a petri dish- trolls. Table 2. Effect of substance A on buckwheat in the germination stage Concentration Sprout Root account 1. in % mm % control mm % control 0.0316 23.9 102.1 55.3 67.0 0.0158 )30.8 131.6 67.3 81.6 0.01 33.1 141.5 79.3 96.1 0.005 36.9 150.9 97.7 118.4 0.00316 38.1 162.9 81.0 98.2 0.00158 37.8 161.5 73.6 89.2

Control — 100.0 — 100.0

I

252303

Example 3

Tomato plants, variety Imuna, were planted in 3 vegetative containers (Mitcherlich) in soil (1 part loamy sand + 1 part hotbed soil) and grown in greenhouse conditions in 3 replicates. In each replicate, a range of 3 doses was applied in different phases of tomato growth. After 5 weeks from the application, we weighed the weight of the green mass of the plants, calculated the weight of 1 plant and determined the percentage of control (Table 3, 4, 5).

Fresh weight of tomato determined 5 weeks after treatment. Treatment at 6 leaf stage.

dose of 1st application in kg. ha ^-1 plant weight in g % control 0.0158 237 153.0 0.031 200 129.0 0.05 165 106.4 Control 155 100.0

Table 4

Fresh weight of tomato determined 5 weeks after treatment. Treatment at 7 leaf stage. dose of 1st application in kg ha ^-1 plant weight in g % control 0.0158 175 176.7 0.031 168 169.7 0.05 185 186.8 Control 99 100.0

Table 5

Fresh weight of tomato determined 5 weeks after treatment. Treatment in the 8-leaf stage. dose of 1. in kg . ha ^-1 plant weight in g % of control

0.0158

0.031

0.05

Control

Example 4

Sugar beet was treated at the pre-harvest maturity stage (20. 10. 1983) with graduated doses of the test compounds corresponding to 7.5 g . ha ^-1 , 15 g . h ^-1 and 30 g . ha ^-1

163 155.2 175 166.6 205 195.2 105 100.0

in a final volume of 1,000 l. ha ¹ . The size of each plot was 125 m ² , with each variant having 3 replications. Three weeks after application, 30 samples were taken from each plot for refractometric determination of sugar content (Table 6).

Table 6

Sugar content in sugar beet determined refractometrically 3 weeks after treatment compound dose effective sugar content % control invention substance in kg ^-1 in %

0.0015 20.2 105.2 A 0.015 23.0 119.8 0.030 21.6 112.0 0.0015 22.3 116.1 C 0.015 23.1 120.3 0.030 ,21.9 114.0 0.0015 21.1 109.9 D 0.015 22.0 114.6 0.030 21.4 111.5 0.0015 24.2 126.0' E 0.015 24.7 128.6 0.030 23.0 119.8 0.0015 20.9 108.8 F 0.015 22.8 118.7 0.030 21.6 112.5 Control — 19.2 100.0

SUBJECT OF THE INVENTION

Claims (1)

OBJECT OF THE INVENTION A composition for controlling plant growth, for increasing crop yields and for the technological quality of plants, characterized in that it contains at least one substituted 2-oxo benzothiazoline of the formula I as active substance and in which X represents a hydrogen or chlorine atom, R is halogen, methyl, cyano, methoxy, n is 0 to 3.