CS200879B1 - Growth plants regulator - Google Patents

Description

A number of chemical compounds affecting plant growth are currently known. These are, in particular, auxins, gibberellins, cytokinins and native or synthetic growth inhibitors. Longer exists a group of substances promoting effect of auxin or gibberellin, particularly vitamin K group, vitamin E, C, PP, B _1, Bg, H, there are also humic acid, skatole, indole, naphthols, nicotinic acid and fatty acid esters. Among the substances exhibiting a strong auxinoid effect, synthetic carboxylic acids such as 1,2,3,4-tetrahydronaphthoic acid, 1-naphthylacetic acid, 1-naphthylbutyric acid, ciscinnamic acid, in particular aryloxycarboxylic acids derived from chlorinated phenols and cresols ( for example 2,4-dichlorophenoxyacetic acid). Research into aryloxycarboxylic acids has received great attention worldwide, and many authors have tested the auxinoid effect of a large number of aryloxycarboxylic acids and their derivatives, of which only a small proportion of the compounds exhibit activity. One of the compounds found to have no auxinic activity is p-phenylphenoxyacetic acid and its derivatives (Hansch C, et al., J. Am. Chem. So. 1963, 85, 2817-24).

It has now been found that p-phenylphenoxyacetic acid and its lithium, sodium, potassium200879

200 070

- 2 and ammonium salts show a potent effect on non-auxinic plant growth, with physiologically active conoentraoes ranging between 50 and 5000 ppm. The effect of p-phenylphenoxyootic acid and its salts on plant growth is manifested by suppressing apical dominance, promoting lateral branching, increasing the growth rate of the side shoots, increasing the branching angle of the branches from the root and increasing the diameter of the trunk. These physiological effects are apparently between the effects of typical auxins, gibberellins and inhibitors, so that p-phenylphenoxyacetic acid and its salts cannot be assigned to any of the groups of plant physiologically active substances .

Due to the variety of plants, it is not possible to cover all suitable and unsuitable ways of using p-phenylphenoxyacetic acid and its salts in a short time and attention was paid to fruit plants in particular. From the tests carried out so far, the most suitable application of p-phenylphenoxyacetic acid and its salts appears to be the use of lanolin pastes containing 200 to 500 ppm of lithium, sodium, potassium or ammonium salts of p-phenylphenylacetic acid, or 800 to 1500 ppm when free p -phenylphenoxyacetic. However, it is also possible to use dilute aqueous solutions or powders, the concentra of the active ingredient not to exceed 5000 ppm. The lanolin paste is applied, for example, to the leaf stumps, under the valleys, to the roots and the like. The reaction of the plants is very strong and can vary depending on the concentration of active substance used. Owing to the high fire resistance of p-phenylphenoxyacetic acid, it is often sufficient to obtain the desired effect only by applying a single lanolin paste for at least one year.

Example of use:

A lanolin paste containing 500 ppm potassium salt of p-phenylphenoxyootic acid was prepared by a known technique. A lanolin paste was applied just below the internode (leaf was removed) in approximately the same length of prunus (Prunus domestica) exposed to the same degree of atmospheric agents. 5 mm wide tape. The experiment started on 15 May and ended on 15 November. The following information was found.

ββββββ & βββββ & βββββββββεχββι parameter: : ΒΒ3ΒΒΒ8Β8Ζ888Β88ΒΒΒΒΒΒΒΒΒΒΕΒΒΒΒΒΒΒΒΒΒ application of potassium salt of acid SBSBSBBBBBBBBaSaSBBBasS control: 8ΗΒΒ · 8ΒΒΟ8Β88 · 8ΒΒ8βΒΒΒα · ΒαΒ £ ·· § $ ΐ · 8Β ·} ΐΙΒΪΒΕΒ8Β3 «88888αΒ8ΒΒ8ΒΒΒΒ3 8BBB888BBB8BBBBBBBSSBB8S height 48 om 52 cm diameter of trunk 6,1 cm 5,2 cm number of side branches 15 Dec 8 min. and max, the distance of the sides- branches 5.2 to 25 cm 2.1 to 15 cm angle of branch deflection min. and max. 42 to 58® 32 to 37 °

mRaBamamssasssmsB & B & SBMBmBasBemBBmsmBsaamssamBaBBamBsamgaBmBmcmBaBammssssasssBímisa

After 24 months, the length of the lateral branches in the control tree was 3 to 6

200 879 ca, in a tree after application of the potassium salt of p-phenylphenoxyacetic acid only 1.8 to 3.2 cm.

Example of use:

A lanolin paste containing 250 ppm of lithium p-phenylphenoxyacetic acid was prepared. The application was performed in the same manner as in the previous example, but the experiment started on August 10 and ended on November 1. The following results were found for plums:

BtíBB8casssS2 = aESEB35B = BSsassss == i5: = SBS0S = sssssssa === ss = s5 = s5 == s ====: = c = sss =: s = sssB = time: sB =: s lithium salt application parameter: p-phenyl acid control:

phenoxyacetic height

52.5 cm cm trunk diameter

5,6 cm

4,8 cm number of side branches min. and max. length of side branches up to 25 cm

7.7 to 15 cm branch angle min. and max. 45-52 ° to 35 °

SBBBBaSBSBBBBBsa:

: ssjs:

: SS;

isassssassxss

Example of use:

Prepare a solution of p-phenylphenoxyacetic acid in distilled water at a concentration of 55 ppm. This solution is used to spray the tree so that the leaf area is continuously wetted. The experiment was carried out on plum 15.5. and evaluated 15.11. We found the following data * acid application parameter: p-phenylphenoxyacetic control:

height stem diameter number of side branches min. and max. length of side branches branch angle min. and max.

cm 5.9 cm

3.8 to 20 cm to 45 ° cm 5.4 cm 7

2.2 to 16 cm to 38 °

SUBJECT OF THE INVENTION

Claims (1)

SUBJECT OF THE INVENTION Use of p-phenylphenoxyacetic acid and its lithium, sodium, potassium or ammonium salts as plant growth regulators.