JPH02225406A - Growth regulation agent and growth regulation method for paddy rice plant - Google Patents

Abstract

PURPOSE:To provide the subject growth-regulation agent containing heptopargil and isoprothiolane as active components, exhibiting excellent growth regulation effect on paddy rice plant at a low dose compared from the separate use of the component, giving healthy seedling and effective in preventing the generation of stuffy seedling in a raising seedling box. CONSTITUTION:The objective agent contains, as active components, (A) heptopargil {=(+ or -)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one O-propynyloximel of formula having plant growth regulation effect and (B) isoprothiolane (=1,3- dithiolan-2-ylidene malonate) useful as an agent for controlling rice blast of paddy rice and known as a growth regulation agent for paddy rice plant. The amount of the component B is 0.1-1,000 pts.wt. per 1 pt.wt. of the component A. The growth of paddy rice plant can be regulated by applying the active components at a concentration of 0.1-3,000ppm to the field during the period before sowing to the initial stage of greening of the paddy rice seedling or to a medium in a raising seedling box.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a growth regulator and a growth regulating method for paddy rice, and more specifically to (±)-1,7,7-trimethylbicyclo[2,2,1]heptan-2-one 0- 2-pro and nyloxime and diisopropyl 1.3-dithiolane-2
The present invention relates to a growth regulator for paddy rice characterized by containing ylidene malonate as an active ingredient, and a method for regulating growth of paddy rice comprising using the drug.

Nicotinic acid amide, which is a type of vitamin, and hydroxyinxazole (-ship name), metasulfocarb (-ship name), etc., which are types of fungicides, are known as early growth regulators for paddy rice.

One of the active ingredients of the present invention, (±)-17,-7-trimethylbicyclo[2,2,1]]heptan-2-one 0-2-propynyloxime (hereinafter referred to as heptopargyl), is available from Japanese Patent Publication No. 57-48150. A compound represented by the following structural formula described in the publication can be used to promote plant growth by applying it to the soil surface for coating plant seeds or drilling after sowing, or by applying it to foliage during the plant growth period. −
is listed. However, the plant growth regulating effect of heptopargyl is not necessarily sufficient, and further improvements are desired.

The other active ingredient, diisopropyl 1,3-dithiolane-2-ylidenemalonate (hereinafter referred to as isobrothiolane), is widely used as a rice blast control agent and as a growth regulator for rice. It is known that its effects include preventing stuffiness of rice seedlings and promoting rooting ("Chemical Regulation of Plants J Vol. 1, 18.71 (198
3)).

In order to improve the action and plant growth regulating effect of hebutpargyl, the present inventors have conducted intensive research and have found that by using it in combination with isobrothiolane, the effect of heptopargyl and isobrothiolane when used alone is In comparison, the present invention was completed based on the discovery that a low dose of these drugs showed remarkable effects that could not be expected from the results of using each drug alone.

When the paddy rice growth regulator of the present invention containing hebutpargyl and isobrothiolane as active ingredients is applied to paddy rice seedlings, the dry weight increases, full and healthy seedlings are obtained, and stuffy seedlings are prevented from growing in seedling boxes. To prevent. It is particularly effective in raising healthy seedlings of paddy rice varieties that tend to overgrow, such as Koshipikari and Sasanishiki.

The mixing ratio of the rice growth regulator of the present invention is 0.1 to 100 isobrothiolane to 1 part by weight of heptopargyl.
0 parts by weight (preferably 1 part by weight of inbrothiolane to 1 part by weight of hebutpargyl).
The proportion ranges from 0 to 500 parts by weight.

The rice growth regulator mixed in the ratio within the above range may be formulated into a dosage form convenient for use, such as a concentrated emulsion, a single granule powder, or a wettable powder. All you have to do is formulate it into a mold.

The method for regulating the growth of paddy rice of the present invention varies depending on the growth stage of paddy rice, the method of use, the timing of treatment, etc., but usually the paddy rice growth regulator of the present invention is applied from before sowing of paddy rice to the period when paddy rice seedlings start greening. Just process it.

When treating the growth regulator of the present invention as a liquid, the concentration of the active ingredient is 0.1 ppm to 100 ppm for heptopargyl.
It may be present at a concentration within the range of 1 ppm, preferably 1 ppm.
Concentrations range from ~50 ppm.

Also, isobrothiolane is 0. lppm~3000ppm
It may be present at a concentration within the range of 1Oppm, preferably 1Oppm.
The treatment may be performed at a concentration ratio in the range of ~11,000 pp.

When a rice seedling box is treated with the growth regulator of the present invention, a seedling box measuring 60 ca in length x 30 cm in width x 3 cm in height is used for boat fishing, and the amount of active ingredient per box is 0.001 g to 0. From the range of .1g, preferably 0
．． From the range of 0.05g to 0.05g, isobrothiolane is 0.1g-1og, preferably 1.5g to 3.0g
For example, isobrothiolane alone is generally used in an amount of 25 g per box, and the present invention exhibits remarkable effects with a lower dose than this.

Typical test examples and examples of the present invention are shown below, but the present invention is not limited thereto.

Test Example 1 Using a beaker with an inner diameter of 1.8 ciI, three grains of germinated paddy rice (variety: Koshihikari) were sown in a solution containing a predetermined concentration of the growth regulator of the present invention. After seeding, 27℃,
After growing the seedlings for 7 days in a phytotron with 25 Klux and irradiation for 12 hours a day, the dry weight of the aboveground and underground parts was measured. The results are shown in Table 1.

As a result of the test in Table 1, the underground dry weight of the heptopargyl and isobrothiolane mixed plot was significantly increased compared to the single plot.

Test Example 2 Paddy rice seeds (variety: Koshihikari) were sterilized with a 200 times solution of benomyl/thiuram mixture (product name: Benlate T, manufactured by DuPont Japan Limited), and after germination, seedling boxes filled with artificial soil ( 60cnX 30c+iX 3c
The seeds were sown in an amount equivalent to 100 g of dry rice per box, and placed in a seedling grower at 30° C. for 2 days. After germination, the seedlings were raised in a greenhouse. At the beginning of greening, apply a predetermined amount of the chemical of the present invention to each seedling pod.
m1 was irrigated. Growth was investigated 14 days after sowing, and the dry weight of the stem, leaf and underground parts was measured in the same manner as in Test Example 1.

The results are shown in Table 2.

Table 2 Test Example 3 Paddy rice seeds (variety: Koshihikari) were sterilized with a 200x solution of benomyl/thiuram mixture (trade name: Benlate T, manufactured by DuPont Japan Limited), and after germination, they were filled with artificial soil. Seedling box (60cmX 30c+nX 3c
The seeds were sown at an amount equivalent to 100 g of dry rice per pod in M), placed in a seedling grower at 30°C for 2 days, and after germination, the seedlings were raised in a greenhouse. At the beginning of greening, apply a predetermined amount of the chemical of the present invention to each seedling pod.
m1 was irrigated. Furthermore, 3 days after 7 days of drug treatment5
A low temperature treatment of ℃ was performed to force the generation of stuffy seedlings.

The incidence of stuffy seedlings was investigated 14 days after the chemical treatment. The results are shown in Table 3.

Table 3 Prescription example 2 Heptopargyl drug substance Isobrothiolane drug substance polyoxyethylene nonylphenyl ether 0.02-4.0 parts 40.0 copies 4.0 copies Alkylnaphcrene Formalin condensate white carbon 2.0 copies 17.0 copies Prescription example 1 Heptopargyl drug substance Isobrothiolane drug substance Tsurupol 3005X (Manufactured by Toho Chemical Industry) cyclohexanone xylene emulsion 0.02-5.0 parts 40.0 copies 10.0 copies 20.0 copies remainder 100.0 copies Prescription example 3 Heptopargyl drug substance Isobrothiolane drug substance polyvinyl alcohol polyoxyethylene nonylphenyl ether Calcined diatomaceous earth 0.06-0.6 part 6.0-12.0 parts 2.0 copies 2.0 copies 5.0 copies clay powder remainder Special permission Out wish Man Nihon Nohyaku Co., Ltd. (2 idiots)

Claims (6)

[Claims] (1) (±)-1,7,7-trimethylbicyclo[2.
2.1] A rice growth regulator comprising heptane-2-one O-2-propynyloxime and diisopropyl 1,3-dithiolan-2-ylidenemalonate as active ingredients. (2) (±)-1,7,7-trimethylbicyclo[2.
2.1] containing diisopropyl 1,3-dithiolan-2-ylidenemalonate in a ratio of 0.1 to 1000 parts by weight per 1 part by weight of heptane-2-one O-2-propynyl oxime The paddy rice growth regulator according to claim 1. (3) (±)-1,7,7-trimethylbicyclo[2.
2.1] Applying agents containing heptane-2-one O-2-propynyloxime and diisopropyl 1,3-dithiolan-2-ylidene malonate as active ingredients from before sowing to when seedlings begin to green. Characteristic method for regulating the growth of paddy rice. (4) The active ingredient concentration was adjusted to (±)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one O-2-
Growth of paddy rice according to claim 3, characterized in that the treatment is carried out at concentrations ranging from 0.1 ppm to 100 ppm of propynyl oxime and from 0.1 ppm to 3000 ppm of diisopropyl 1,3-dithiolan-2-ylidene malonate. Adjustment method. (5) (±)-1,7,7-trimethylbicyclo[2.
2.1] Rice seedling box culture medium is treated with a drug containing heptane-2-one O-2-propynyloxime and diisopropyl 1,3-dithiolan-2-ylidene malonate as active ingredients. Growth regulation method. (6) (±)-1,7,7-trimethylbicyclo[2.
2.1] Drugs containing heptane-2-one O-2-propynyloxime and diisopropyl 1,3-dithiolan-2-ylidene malonate as active ingredients per rice seedling box medium (±)- 0.001 g to 0.1 g of 1,7,7-trimethylbicyclo[2.2.1]heptan-2-one O-2-propynyl oxime and 0.0 g of diisopropyl 1,3-dithiolan-2-ylidenemalonate. 6. The method for regulating the growth of paddy rice according to claim 5, characterized in that the treatment is carried out at a rate in the range of .1 g to 10 g.