SU349128A1 - PLANT GROWTH REGULATOR - Google Patents

Description

This invention relates to chemical means of controlling plant growth. It is known to use phosphorus compounds, for example, 2-ethyl- () -phosphonic acid, as plant growth regulators. However, the associations of this gruiy1) 1 have a sufficient growth-regulating activity. It is proposed to use the 2-chloroethyl- (thiono) -phosphonic acid derivatives of general formula ClCH.CHs-P as a new plant growth regulator: X - oxygen or sulfur. Formulas and formulas I are effective in treating flax, beans, seekers, and millet. They also accelerate the ripening of tomatoes. Recommended coititations with 0.0005-2%, mostly from 0.01-0.5% 5 10 15 20 25 Compounds of formula I are obtained by reacting 2-chloroethyl- (tnono) -phosphonic acid dichlorohydrides with substitutional phenols or primary substances in the presence of an acceptor hydrogen chloride. Of the compound of formula I, test chlorine B, - methyl 1-2-chloroethyl phosphonate (compound LU 1); o-feiyl-2-chloroethylthionophosphonic acid (compound L9 2); K-propl-2-chloroethylphosphonic acid; N-methyl-2-chlorostilphosphonic acid; N - pzopropyl-2 - chloroethylthiophosphoric acid (compound 3); N-butyl-2-chloroethylthiophosphoric acid; X- (|) epil-2-chloroethyl (I1 phosphorus 1; 11SL1) th1; K-butyl-2-chloroethylphosphonic acid (compound L1 and L4); o - () epil-2 - chloroethylphosphoic KUC.IOTI.I (compound No. 5); O-2,4-dichlorophenyl-2-chloroethylthioiophosphipic acid; O-2-chlorophenyl-2-chloroethylthiophosphonic acid (compound No. 7); O-2,6-dichlorophenl-2 - chloroethylthioiophosphoric acid (compound No. 8); 0-3-chlorophenyl-2-chloroethylthionophosphonic acid (sudiisium JMg 9); o-3-yitrophenyl-2-chloroethylthionophosphonic acid; N-isonroyl-2-chloroethylphosphonic acid (compound No. 10). Example 1. Slowing the growth of flax. In a Petri dish of the filamentous bogee magazine, 25 seeds and flax are laid out, 10 ml of a solution of the active substance are added and the seeds are germinated for 3 days in the dark at 25 ° C. Then, the length of shoot and roots and growth retardation of nx and relation to the control (in all of them plants treated with water) are determined, where 0% means no growth retardation and 100% growth. For comparison, the 2-chloroethylphosphonic acid (Compound A) is used. The results are presented in Table. 1. Table 10 kg / ha. After 8 days and after processing, the length of leguminous plants was determined but compared with the control. The results are shown in the table. 3. Table 3 Compound Number or Length of Legumes. drug PR and. m e r 4. Slow growth of nrosa. Nrosa plants with a height of 4 cm are treated with Compound No. 1 and Compound A. 6 days after the treatment, the growth rate of the plants is determined. The results are presented in table. 4. Table 4

Example 2. Slow growth isheians.

Wheat plants with a height of 4 cm are treated with compounds of the formula (Formula E) I n Compound. MA at a dose of 5000 mg / kg. After 10 days of treatment, the length of wheat stalk is determined by comparison with the control.

The results are listed in Table. 2

table 2

PRI me R 5. Slowing the growth of beans.

Beans with a height of 10 cm are treated with compounds of formula I and compound A at a dose of 2500 mg / kg. Six days after the treatment, the growth retardation walls are determined compared to the control. The results are shown in Table. five.

Table 5

Connection number or

Slowing plant growth,% 5Q preparation

Water

52 63 55 63 68

Table 6

The data presented testifies to a high growth regulating activating compound, which exceeds the activity of a known plant growth regulator, 2-chloroethylphosphonic acid.

Subject invention

Application of derivatives of 2-chloroethyl- (thiono) -phosphonic acid of general formula

С1СН, СН, -Р

Xi

I x

ten

where R is aryloxyradical, substituted by halogen, alkyl, hydroxyl or nitro, monoalkyl or monoarylamino; X - oxygen nli sulfur, as a plant growth regulator.