Isonicotinanilide derivatives, plant growth regulating compositions and use

This invention relates to isonicotinanilide derivatives of the formula (I): ##STR5## (wherein R.sub.1 is a hydrogen atom or a lower alkyl group usually C.sub.1 -C.sub.4 alkyl, preferably C.sub.1 -C.sub.2 alkyl; X is a halogen atom such as F, Cl, Br or I, preferably Cl or Br, or methyl; n is an integer of from 0 to 2; R.sub.2 is phenyl, halo-substituted phenyl such as mono- or di-fluoro, chloro, bromo- or iodo-substituted phenyl, preferably 2-chloro or 4-chloro phenyl, or a lower alkyl group usually C.sub.1 -C.sub.4 alkyl; and Q is ##STR6## provided that when R.sub.2 is phenyl or halo-substituted phenyl, Q is ##STR7## or --CH.sub.2 --, and when R.sub.2 is a lower alkyl group, Q is ##STR8##
This invention also relates to a process for preparing the isonicotinanilide derivatives and to a plant growth regulator which contains one or more isonicotinanilide derivatives. The derivatives of the formula (I) have activity for regulating the growth of various plants, especially of grassy plants.
The biggest change in rice culture in recent years has been the remarkable development in mechanization of rice-trans planting and rice-harvesting. Thus, attention is being paid to development of seedlings tough enough to withstand mechanized transplantation and of culture technique for inhibiting falldown of rice plant during harvesting. For example, specific strains of rice such as Koshihikari, Sasanishiki and so on have become famous and are appreciated for their excellent taste. However, these strains of rice have some poor characteristics such as very low resistance to falldown and to pests. For these reasons, it has long been desired to establish good cultivation technique or to develop plant growth regulation with use of chemicals so that sufficiently tough seedlings and plants having good properties for mechanized harvesting can be realized.
The inventors of this invention have searched for several years to find compounds capable of regulating the growth of various plants, and found that isonicotinanilides represented by the formula (I) have excellent growth regulating activity, particularly with respect to grassy plants. On the basis of this fact, they have continued their study to complete this invention.
The compounds of this invention can be advantageously applied to inhibit useless unproductive growth, and excess aging in a rice seedling bed and to inhibit falldown in paddy field. In addition to these advantages, the compounds contribute to increase in the yield of rice. Also, these advantages are observed with respect to other grassy plants such as wheat, barley, corn, sugar cane or the like. Furthermore, the compounds of this invention exhibit an activity to inhibit undesirable growth of hypocotyl of broad-leaf plants, such as egg plant, cucumber and the like.
In addition to the crops above, the compounds are advantageously applied to lawn. Lawn is widely used in private and public gardens, golf links, green zones or greenbelts, the edge of roads, and the like. However, lawn is troublesome and costly to take care of; this is especially true in the summer when mowing must be done frequently because of rapid growth of the lawn and, therefore, is very expensive.
Also, various grassy plants other than lawn are planted on the edge or shoulder of roads or highway, greenbelts, highway or railroad banks, or the like. Taking care of these plants is not only costly and laborious, but also is very dangerous. Thus, the application of the compounds of this invention to these plants is very advantageous.
The compounds of the formula (I) can be used to regulate the growth of both broadleaf and grassy plants, and as a result of the regulation of growth, an improvement in resistance to poor growing circumstances and various pests can be expected.
Furthermore, the application of the compounds to crops increases the amount of chlorophyll in leaves to accelerate the photosynthesis activity and to promote the production of carbohydrate and the growth of roots.
A great advantage of this invention is that the compounds of this invention regulate the growth of plants, particularly the height of plants, and thicken the foliage and aid healthy growth without causing phytotoxicity such as leaf burn or foliage burn whatever type of treatment such as seed treatment, soil treatment or foliage treatment is selected.
The compounds of the formula (I) are novel and are prepared, for example, by the following process.
That is, the process comprises reacting an isonicotinyl halide of the formula (II) ##STR9## (wherein Y is a halogen atom) in a suitable solvent with an aniline derivative of the formula (III) ##STR10## (wherein R.sub.1, R.sub.2, X, n and Q are the same as those defined above) to form the compound of the formula (I).
This reaction can be promoted by use of an acid removing agent, such as pyridine, triethylamine, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate or the like.
A solvent useful in this reaction includes benzene, toluene, xylene, dichloromethane, chloroform, tetrahydrofuran, dioxane, dimethylformamide and the like. The reaction is carried out at room temperature but may be conducted at an elevated temperature or at a lower temperature depending on other reaction factors. The reaction temperature is preferably from 0.degree. to 60.degree. C. The reaction period varies depending on other specific reaction conditions, but usually ranges from 1 to 8 hours. After completion of the reaction, the product may be isolated and purified in a conventional way.
Alternatively, the compound of the formula (V) ##STR11## (wherein R.sub.1 is a hydrogen atom or a lower alkyl group; X is a halogen atom or methyl; n is an integer of from 0 to 2; R.sub.2 is phenyl, halo-substituted phenyl or a lower alkyl; and Z is ##STR12## or --CH.sub.2 --, provided that Z is ##STR13## when R.sub.2 is a lower alkyl group) can be prepared by reducing an isonicotinic acid derivative of the formula (IV) ##STR14## wherein R.sub.1, R.sub.2, X, and n are the same as those defined above with use of a reducing agent.
The reducing agent which is useful in this reaction includes metal hydrides such as aluminum lithium hydride, sodium borohydride and the like. The reaction with use of the reducing agent can be conducted in a conventional way.
Preparation of the compounds of this invention is further illustrated by the following exemplified preparation.
PREPARATION 1
N-Methyl-isonicotin-[4-chloro-2-(.alpha.-hydroxybenzyl)]anilide (Compound No. 3)
Isonicotinyl chloride hydrochloride (1.4 g) was added slowly over about 30 min. to a solution of 2-methylamino-5-chlorobenzhydrol (1.5 g) in pyridine (30 ml) while stirring under cooling with ice. After continuing the stirring at room temperature for 3 hours, water (200 ml) was added to the reaction mixture to precipitate crystals. The crystals were collected and recrystallized from methanol-acetone to give 1.7 g of N-methyl-isonicotin-[4-chloro-2-(.alpha.-hydroxybenzyl)]anilide having a melting point of 199.degree.-201.degree. C.
Analysis: Calcd. for C.sub.20 H.sub.17 ClN.sub.2 O.sub.2 (molecular weight: 351.81): C, 68.08; H, 4.86; N, 7.04 (%). Found: C, 67.96; H, 4.98; N, 7.79 (%).
PREPARATION 2
Isonicotin-[4-chloro-2-(.alpha.-hydroxybenzyl)]anilide (Compound No. 4)
Sodium borohydride (0.2 g) was added slowly over about 30 min. to a solution of isonicotin-(4-chloro-2-benzoyl)anilide (1.9 g) in methanol (20 ml). After continuing the stirring at room temperature for 2 hours, water (200 ml) was added to the reaction mixture to precipitate crystals. The crystals were collected by filtration and recrystallized from dimethylformamide-methanol to give 1.8 g of isonicotin-[4-chloro-2-(.alpha.-hydroxybenzyl)]anilide having a melting point of 210.degree.-212.degree. C.
Analysis: Calcd. for C.sub.19 H.sub.15 ClN.sub.2 O.sub.2 (molecular weight: 338.79): C, 67.36; H, 4.46; N, 8.27 (%). Found: C, 67.18; H, 4.56; N, 8.29 (%).
PREPARATION 3
Isonicotin-(4-chloro-2-benzyl)anilide (Compound No. 1)
Isonicotinyl chloride hydrochloride (1.4 g) was added slowly over about 30 min. to a solution of 4-chloro-2-benzylaniline (1.3 g) in pyridine (30 ml) while stirring under cooling with ice, followed by stirring at room temperature for 3 hours to complete the reaction. Water (200 ml) was added to the reaction mixture to precipitate crystals which were collected. Recrystallization of the crystals from ethanol gave 1.6 g of isonicotin-(4-chloro-2-benzyl)anilide having a melting point of 178.degree.-179.degree. C.
Analysis: Calcd. for C.sub.19 H.sub.15 ClN.sub.2 O (molecular weight: 322.79): C, 70.70; H, 4.68; N, 8.68 (%). Found: C, 70.75; H, 4.79; N, 8.65 (%).
PREPARATION 4
Isonicotin-2-acetylanilide (Compound No. 18)
Isonicotinyl chloride hydrochloride (2.14 g) was added slowly to a solution of 2-aminoacetophenone (1.35 g) in pyridine (30 ml) while stirring under cooling with ice, followed by stirring at room temperature for 8 hours. Water was then added to the reaction mixture to precipitate crystals which were recovered by filtration and recrystallized from n-hexaneethylacetate to give 2.23 g of isonicotin-2-acetylanilide having a melting point of 116.degree.-117.degree. C. (Yield: 93%).
Analysis: Calcd. for C.sub.14 H.sub.12 N.sub.2 O.sub.2 (molecular weight: 240.26): C, 69.99; H, 5.03; N, 11.66 (%). Found: C, 70.08; H, 4.98; N, 11.60 (%).
PREPARATION 5
Isonicotin-2-acetyl-4-chloroanilide (Compound No. 19)
Preparation 1 was repeated, except that 2-amino-5-chloroacetophenone (1.7 g) was used instead of 2-aminoacetophenone to give 2.5 g of isonicotin-2-acetyl-4-chloroanilide having a melting point of 203.degree.-205.degree. C. (Yield: 90%).
Analysis: Calcd. for C.sub.14 H.sub.11 ClN.sub.2 O.sub.2 (molecular weight: 274.71): C, 61.21; H, 4.04; N, 10.20 (%). Found: C, 61.09; H, 3.99; N, 10.24 (%).
PREPARATION 6
Isonicotin-4-chloro-2-(.alpha.-hydroxyethyl)anilide (Compound No. 20)
Sodium borohydride (0.34 g) was added slowly to a solution of isonicotin-2-acetyl-4-chloroanilide (2.5 g) prepared in Preparation 2 in methanol (30 ml) while stirring under cooling with water. After stirring at room temperature for 3 hours, the reaction mixture was evaporated under reduced pressure to remove methanol and then water (100 ml) was added to the residue to precipitate crystals. The crystals were recovered by filtration and recrystallized from n-hexane-ethyl acetate to give 2.3 g of isonicotin-4-chloro-2-(.alpha.-hydroxyethyl)anilide having a melting point of 142.degree.-143.degree. C. (Yield: 92%).
Analysis: Calcd. for C.sub.14 H.sub.13 ClN.sub.2 O.sub.2 (molecular weight: 276.62): C, 60.77; H, 4.74; N, 10.12 (%). Found: C, 60.70; H, 4.77; N, 10.08 (%).
The following Table 1 shows exemplary compounds of the formula (I) which were prepared as in the Preparations above. These listed compounds are shown for illustrative purposes only and are by no means intended to limit the scope of the invention. The reference No. for defining these compounds will be used in Examples of formulation and Experiments hereunder.
TABLE 1______________________________________Com-poundNo. Chemical Structure m.p. (.degree.C.)______________________________________ ##STR15## 178-1792 ##STR16## 144-1453 ##STR17## 199-2014 ##STR18## 210-2125 ##STR19## 133-1346 ##STR20## 184-1857 ##STR21## 216-2178 ##STR22## 204-2059 ##STR23## 158-15910 ##STR24## 208-20911 ##STR25## 208-21012 ##STR26## 206-20713 ##STR27## 119.5-120.514 ##STR28## 209-21115 ##STR29## 152-15316 ##STR30## 177-177.517 ##STR31## 123-12418 ##STR32## 116-11719 ##STR33## 203-20520 ##STR34## 142-14321 ##STR35## 143-14422 ##STR36## 138-14023 ##STR37## 137-13924 ##STR38## 158-15925 ##STR39## 89-9126 ##STR40## 127-12827 ##STR41## 55-5728 ##STR42## Oil NMR (CDCl.sub.3).delta. 2.35 (3H,S) 3.36 (3H,S) 7.09-7.60 (5H,m) 8.45-8.52 (2H,d)29 ##STR43## 153-15430 ##STR44## 151-15331 ##STR45## 133-13432 ##STR46## 131-13233 ##STR47## 161-16234 ##STR48## 141-14235 ##STR49## 142-14336 ##STR50## 207-20837 ##STR51## 156-157______________________________________
In accordance with this invention, the plant growth regulator is applied to plants in any suitable dose, usually in a dose such that a compound of the formula (I) or a mixture of two or more compounds of the formula (I) is 50-2,000 g/10 ares, preferably 200-1,000 g/10 ares, although the dose of the regulator may vary depend on the species and growth level of the plants to be regulated.
The compounds of this invention can be formulated in a conventional way using a solid or liquid carrier commonly used in the formulation of agricultural compositions into wettable powder, emulsion, dust, granules, tablet or the like. According to the necessity, a conventional adjuvant, such as dispersant, diluent, emulsifier, penetrating agent, binder or the like may be added. Further, a herbicidal compound, fungicidal compound, insecticidal compound, other plant growth regulator, fertilizer or the like may be incorporated into the formulation of this invention.
The activities of the plant growth regulator of this invention were confirmed by the following Experiments.
EXPERIMENT 1
Growth Regulating Test for Grassy Plants by Pre-emergence Soil Treatment
A pot with the open area of 1/5000 are was filed with dry clayish loam, seeded with bentgrass, Kentucky bluegrass, wild lawn, cucumber, green gram, komatsuna (Brassica Rapa Var. pervidis), nutsedge (Cyprus microiri), crabgrass, rice, or corn, and lightly covered with the same soil. The pot was sprayed with an aqueous dispersion of the wettable powder formulated in Example 1 in a dose of 250 g or 500 g of the active compound per 10 ares by using a portable sprayer. Fifty days after spraying, the height of the plant in connection with each pot was observed.
The results are shown in Table 2 below.
The degree of growth regulating activity for each plant was rated on the following scale.
0: 0-10% growth inhibition (in terms of untreated section)
1: 11-20% growth inhibition
2: 21-30% growth inhibition
3: 31-40% growth inhibition
4: 41-50% growth inhibition
5: more than 51% growth inhibition
TABLE 2__________________________________________________________________________Test Growth Regulating ActivityCompound Dose Bent- Kentucky Green Crab- RiceNo. (g/10a) grass bluegrass Cucumber gram Komatsuna Nutsedge grass plant Corn Injury__________________________________________________________________________1 500 5 5 5 2 5 5 5 3 3 none 250 5 5 4 1 4 5 5 2 2 "2 500 2 2 0 1 2 3 2 0 1 " 250 0 0 0 0 2 2 1 0 0 "3 500 2 2 1 1 2 3 2 1 0 " 250 1 1 0 0 1 2 1 0 0 "4 500 5 5 5 2 2 5 5 3 3 " 250 5 5 5 1 1 5 5 2 2 "5 500 5 5 1 1 5 3 3 1 2 " 250 5 5 0 0 5 3 2 1 1 "6 500 2 2 1 0 5 2 3 1 1 " 250 1 1 1 0 4 1 2 0 0 "7 500 5 5 4 2 3 5 5 3 3 " 250 5 5 4 1 2 5 5 2 2 "8 500 5 5 2 1 4 3 3 1 1 " 250 3 2 1 0 3 3 2 0 0 "Non- -- 0 0 0 0 0 0 0 0 0 --treated__________________________________________________________________________
EXPERIMENT 2
Growth Regulating Test for Grassy Plants by Foliage Treatment
The compound of this invention formulated as in Example 2 was diluted with water and sprayed by a portable sprayer on the foliage of each of bentgrass, Kentucky bluegrass, cucumber, tomato and crabgrass which had been cultivated as in Experiment 1 to have a height of 5-6 cm. The dose of the sprayed active compound was 250 g of 500 g per 10 ares. Thirty days after spraying, the height of each plant was measured and averaged.
The results are shown in Table 3.
The rating of plant growth inhibition in Table 3 is the same as that illustrated in Experiment 1.
TABLE 3______________________________________TestCom- Growth Regulating Activitypound Dose Bent- Kentucky Cu- To- Crab-No. (g/10a) grass bluegrass cumber mato grass Injury______________________________________1 500 5 5 3 2 5 none 250 5 5 2 1 5 "2 500 4 4 1 1 2 " 250 2 2 0 0 1 "3 500 5 4 2 2 5 " 250 4 4 1 1 4 "4 500 5 5 3 3 5 " 250 5 5 2 2 5 "5 500 3 4 2 2 4 " 250 2 2 1 1 3 "7 500 5 5 2 2 5 " 250 5 5 2 1 5 "8 500 3 3 1 1 3 " 250 2 1 0 0 2 "Non- -- 0 0 0 0 0 --treated______________________________________
EXPERIMENT 3
Field Test for Lawn Growth Regulation by Foliage Treatment
Lawn (bentgrass) which had been cultivated in a field for three years since transplantation was divided into sections of 1 m square, and mowed to a grass height of 1 cm in the seasons when the lawn grows fast. The compound of this invention formulated as in Example 1 and diluted with water was sprayed by a sprayer at a dose of 1 g, 2 g or 4 g per 1 m square in terms of the active compound.
Forty days after spraying, the lawn was mowed to a grass height of 1 cm, and the weight of mowed raw lawn in each section was measured.
The results are shown in Table 4 below.
TABLE 4______________________________________Test Average Weight ofCompound Dose Height of mowed GrassNo. (g/m.sup.2) Plant (cm) (g/m.sup.2) Injury______________________________________ 1 4.3 195 none1 2 3.2 162 " 4 2.8 130 " 1 3.4 180 "4 2 2.5 135 " 4 2.2 120 "Non- -- 8.9 380 --treated______________________________________
EXPERIMENT 4
Unproductive Growth Inhibiting Test for Rice Seedlings by Pre-emergence Soil Treatment
A box with 60 cm length, 30 cm width and 3 cm depth was filled with 3.2 kg of clayish loam, seeded with 200 g of germinated grains of rice (Koshihikari strain), and lightly covered with 0.8 kg of soil. The test compound formulated as in Example 1 and diluted with water was sprayed by a portable sprayer on the soil in a dose of 0.1 g, 0.5 g, 1.0 g, or 2.0 g per box. Forty days after spraying, the weight of the rice seedlings, number of leaves, area and height of foliages, and length and weight of roots were measured. The test was carried out in a growth chamber in which the temperature was maintained in the range of from 25.degree. to 30.degree. C.
The results are shown in Table 5 below.
In Table 5, the figures shown are the average of 50 seedlings and the weight is on a dry basis.
TABLE 5__________________________________________________________________________Test Height Root Area of Foliage RootCompound Dose of plant length Number leaves weight weightNo. (g/box) (cm) (cm) of leaves (cm/plant) (mg/plant) (mg/plant) Injury__________________________________________________________________________Non- -- 34.5 8.3 5.1 7.2 20.6 8.2 --treated1 2 18.3 8.5 6.2 6.8 21.5 8.1 none 1 18.5 10.2 6.2 7.2 26.3 12.5 " 0.5 20.5 11.1 6.3 7.8 26.5 16.3 " 0.1 32.2 9.5 6.1 8.2 25.2 17.5 "2 2 20.3 8.5 5.4 7.5 26.3 9.2 " 1 26.5 9.3 6.2 7.7 30.2 10.3 " 0.5 30.2 10.6 6.2 8.4 30.4 21.5 " 0.1 35.5 13.5 6.0 7.2 30.7 20.2 "4 2 16.3 8.0 6.3 7.0 21.2 8.5 " 1 18.5 8.5 6.7 7.5 22.6 9.7 " 0.5 18.2 8.4 6.5 7.6 27.7 12.5 " 0.1 20.7 12.2 5.8 7.6 29.5 16.3 "__________________________________________________________________________
EXPERIMENT 5
Rice seedlings (Koshihikari strain) which had been grown in a seedling box were transplanted in the paddy field which was divided into sections of 2.5 m.times.2 m. Five seedlings were transplanted at one spot with the spots in one row spaced 30 cm apart, the rows being 12 cm apart. Forty days after the transplantation, the test compound formulated as in Example 1 and diluted with water was sprayed by a portable sprayer on the soil in a dose of 200 g, 400 g, or 600 g per 10 ares. Twenty days after coming into ears, the number of stalks and ears per spot, the length between 1st and 5th nodes of stalks, and the weight of dry stalk from 4th to 5th node were measured.
The results are shown in Table 6.
In Table 6, the figures shown are the average of 50 spots of plants.
TABLE 6__________________________________________________________________________ Unit stalk weightTest Number of Ear between nodesCompound Dose stalks length Length between nodes (cm) (mg/cm)No. (g/10a) per spot (cm) 1st 2nd 3rd 4th 5th Total 4th 5th__________________________________________________________________________Non- -- 28 18.4 35.0 20.2 14.5 8.0 3.2 80.9 10.2 22.0treated1 600 35 19.0 32.2 12.7 4.4 1.4 0.8 51.5 23.3 42.5 400 32 19.3 34.8 14.0 7.6 4.1 1.2 61.7 29.2 42.0 200 30 19.8 35.0 16.2 10.2 5.2 2.0 68.6 19.8 33.04 600 38 19.2 30.6 12.5 4.7 1.2 0.7 49.7 30.5 62.5 400 32 18.6 31.0 12.2 4.5 1.2 0.8 49.7 25.5 55.0 200 35 17.0 30.7 15.8 9.6 2.8 0.8 59.7 25.2 50.07 600 33 19.1 34.3 16.4 9.6 4.1 1.0 65.4 31.2 56.2 400 33 19.0 35.6 15.9 9.7 5.6 1.6 68.4 30.2 45.5 200 32 19.2 35.0 16.2 10.2 5.2 2.0 68.6 15.8 33.7__________________________________________________________________________
EXPERIMENT 6
Growth Regulating Test for Cucumber and Rice Plant at Early Growing Stage (Germination Test in Petri Dishes)
Filter paper was placed on the bottom of a petri dish 9 cm in diameter, and after pouring 15 ml of a 10 ppm test compound aqueous solution into the dish, 10 seeds of cucumber (Tokiwa strain) and 10 seeds of rice (Sasanishiki strain) were placed on the paper. Tests were conducted by 3 runs for each test compound in a growth chamber having its temperature maintained at 25.degree. C. Seventeen days after the placement of seeds, length of hypocotyl and roots and dry weight of foliage and roots for cucumber and height of plant, length of the second leaf sheath and dry weight of foliage and roots for rice plant were measured.
The results are shown in Table 7 on cucumber, and Table 8 on rice plant.
Each numeral in Tables 7 and 8 represents an average of 30 plants.
TABLE 7______________________________________Test Root Foliage RootCom- Hypocotyl length weight weightpound Dose length (cm/ (mg/ (mg/No. (ppm) (cm/plant) plant) plant) plant) Injury______________________________________Non- -- 4.5 9.5 14.2 3.2 --treated2 10 0.9 15.9 15.6 4.8 none4 10 0.8 14.4 15.0 4.6 "7 10 1.0 16.4 15.8 5.1 "8 10 0.6 14.3 15.0 5.7 "9 10 0.7 16.2 17.6 5.0 "10 10 0.7 12.9 16.6 4.2 "11 10 1.0 14.3 17.3 4.5 "12 10 0.8 18.3 14.5 5.4 "13 10 1.0 15.2 14.9 4.0 "14 10 2.0 13.4 15.2 5.1 "15 10 1.9 14.0 14.5 5.1 "16 10 1.0 13.8 15.8 4.9 "______________________________________
TABLE 8______________________________________Test Length Foliage RootCom- Height of of second weight weightpound Dose plant leaf seath (mg/ (mg/No. (ppm) (cm) (cm) plant) plant) Injury______________________________________Non- -- 8.4 3.9 4.2 4.0 --treated2 10 4.2 2.1 4.0 7.2 none4 10 3.6 1.5 3.2 6.0 "7 10 3.7 1.6 3.5 6.8 "8 10 3.8 1.7 3.9 7.5 "9 10 3.3 1.6 4.1 7.5 "10 10 3.8 1.7 4.2 6.2 "11 10 4.0 2.0 3.8 6.8 "12 10 3.7 1.5 4.0 6.5 "13 10 4.0 1.8 4.1 5.1 "14 10 4.1 2.1 4.2 5.3 "15 10 4.8 2.0 4.3 5.8 "16 10 3.8 2.0 3.4 6.9 "______________________________________
EXPERIMENT 7
Unproductive Growth Inhibiting Test for Rice Seedling with use of Test Compound-premixed Soil
Wettable powder (2 g or 1 g) formulated as in Example 1 for each test compound was thoroughly mixed with 4 kg of soil. A seedling cultivation box 60 cm long, 30 cm wide and 3 cm deep was filled with 3.2 kg of the treated soil, seeded with 200 g of germinated grains of rice (Koshihikari strain), watered and lightly covered with the remaining soil (0.8 kg). The box was placed and retained in a growth chamber having its temperature maintained at 30.degree. C. Twenty-five days after seedling, the height of the plant, length of roots, number of leaves and weight each of foliage and roots were measured.
The results are shown in Table 9.
Each number in Table 9 is an average of 50 seedlings, and the weight is on a dry basis.
TABLE 9______________________________________Test Height Root Num- Foliage RootCom- Dose of length ber weight weightpound (g/ plant (cm/ of (mg/ (mg/ In-No. box) (cm) plant) leaves plant) plant) jury______________________________________Non- -- 26.5 6.5 3.8 18.5 5.9 --treated1 2 15.3 9.5 4.1 18.1 8.6 none 1 19.6 12.5 4.2 18.3 10.2 "4 2 12.2 8.7 4.3 16.3 6.3 " 1 15.1 8.5 4.2 18.9 8.4 "9 2 16.2 9.1 4.5 17.4 7.2 " 1 18.3 10.2 4.2 18.2 9.9 "12 2 14.1 8.6 4.5 16.1 10.5 " 1 18.4 10.3 4.1 17.9 10.6 "16 2 13.5 9.2 4.3 16.7 8.5 "16 1 19.2 10.1 4.2 18.4 11.4 "______________________________________
EXPERIMENT 8
Growth Regulating Test for Cucumber and Rice Plant at Early Growing Stage (Germination Test in Petri Dishes)
Filter paper was placed on the bottom of a petri dish 9 cm in diameter, and after pouring 15 ml of a 10 ppm test compound aqueous solution into the dish, 10 seeds of cucumber (Tokiwa strain) and 10 seeds of rice (Sasanishiki strain) were placed on the paper. Tests were conducted by 3 runs for each test compound in a growth chamber having its temperature and brightness maintained at 25.degree. C. and at 500 lux. Seventeen days after the placement of seeds, length of hypocotyl and roots and dry weight of foliage and roots for cucumber, and height of plant, length of the second leaf sheath and dry weight of foliage and roots for rice plant were measured.
The results are shown in Table 10 on cucumber, and Table 11 on rice plant.
Each number in Tables 10 and 11 is an average of 30 plants.
TABLE 10______________________________________Test Foliage RootCom- Hypocotyl Root weight weightpound Dose length length (mg/ (mg/No. (ppm) (cm) (cm) plant) plant) Injury______________________________________Non- -- 6.0 9.8 15.3 3.2 --treated17 50 1.0 13.7 15.2 4.1 none 10 1.1 14.3 15.3 4.5 " 1 1.2 11.0 15.6 4.8 "18 50 0.6 7.5 18.4 2.9 " 10 2.5 9.7 15.0 3.0 " 1 2.6 9.9 16.8 3.0 "19 50 1.9 10.7 15.4 4.6 " 10 2.3 10.6 16.2 5.8 " 1 2.4 11.0 15.0 4.2 "20 50 0.7 9.5 14.2 4.1 " 10 1.0 12.2 15.8 5.2 " 1 1.1 14.1 16.1 4.6 "21 50 1.0 10.2 14.3 4.2 " 10 1.2 13.5 15.6 5.1 " 1 1.8 14.1 15.4 4.6 "______________________________________
TABLE 11______________________________________ Length of Fol-Test Height second iage RootCom- of leaf Root weight weightpound Dose plant seath length (mg/ (mg/ In-No. (ppm) (cm) (cm) (cm) plant) plant) jury______________________________________Non- -- 7.1 4.2 5.1 4.3 3.6 --treated 50 4.3 1.1 6.3 4.0 4.8 none17 10 5.0 1.2 5.8 4.2 5.4 " 1 5.2 1.5 6.2 4.2 4.5 " 50 3.8 1.2 4.9 3.8 3.8 "18 10 3.9 1.2 5.0 4.1 4.1 " 1 4.2 1.4 5.5 4.4 4.2 " 50 6.0 2.0 7.5 4.3 5.1 "19 10 6.2 2.4 8.4 4.5 6.2 " 1 6.5 3.0 7.2 4.6 5.0 " 50 4.0 1.0 5.8 4.0 4.1 "20 10 4.3 1.0 6.5 4.0 5.5 " 1 4.8 1.2 6.1 4.1 4.6 " 50 4.0 1.1 5.8 4.1 4.5 "21 10 4.3 1.3 6.7 4.4 5.2 " 1 5.2 1.7 6.9 4.2 5.6 "______________________________________
EXPERIMENT 9
Unproductive Growth Inhibiting Test for Rice Seedling with use of Test Compound-premixed Soil
Wettable powder (2 g, 1 g or 0.5 g) formulated as in Example 1 for each test compound was thoroughly mixed with 4 kg of soil. A seedling cultivation box of perforated bottomed plastic 60 cm long, 30 cm wide and 3 cm deep was filled with 3.2 kg of the treated soil, seeded with 150 g of germinated grains of rice (Koshihikari strain), watered and lightly covered with the remaining soil (0.8 kg). The box was placed for 2 days in a growth chamber having its temperature maintained at 25.degree.-30.degree. C., so that the seeds were germinated. Then, the box was moved a filled plastic hothouse. Twenty-five days after seeding, the height of the plant, length of roots, number of leaves and weight each of foliage and roots were measured.
The results are shown in Table 12.
Each number in Table 12 is an average of 50 seedlings, and the weight is on a dry basis.
TABLE 12______________________________________Test Height Num- Foliage RootCom- Dose of Root ber weight weightpound (g/ plant length of (mg/ (mg/ In-No. box) (cm) (cm) leaves plant) plant) jury______________________________________Non- -- 22.3 7.2 3.7 22.6 8.3 --treated 2 7.5 8.3 4.5 19.5 10.2 none17 1 7.6 8.9 4.7 20.7 10.9 " 0.5 9.9 9.2 4.0 23.1 11.5 " 2 13.5 8.1 4.0 22.2 9.5 "18 1 16.2 8.8 3.9 22.8 9.7 " 0.5 16.5 8.1 3.7 23.4 9.4 " 2 10.2 9.2 4.2 22.0 9.5 "19 1 11.1 10.5 4.5 22.8 10.7 " 0.5 15.7 8.1 4.0 22.8 11.1 " 2 7.4 10.3 4.4 20.7 10.7 "20 1 7.8 12.5 4.4 21.6 11.5 " 0.5 10.2 13.2 4.2 23.1 10.8 " 2 13.0 8.7 4.6 20.5 10.3 "21 1 14.2 9.2 4.2 22.8 12.5 " 0.5 15.5 10.5 4.0 22.6 11.8 " 2 13.6 8.0 4.0 22.0 9.3 "22 1 16.1 8.6 3.8 22.9 9.5 " 0.5 16.5 8.1 3.5 23.5 9.6 " 2 12.4 7.6 4.3 21.7 9.4 "23 1 13.4 8.9 4.6 20.5 10.3 " 0.5 14.3 8.3 4.2 22.5 10.2 " 2 7.5 10.2 4.4 20.7 10.5 "24 1 8.0 12.3 4.3 21.4 11.5 " 0.5 11.2 13.1 4.0 23.0 10.6 " 2 13.2 8.0 4.0 22.1 9.3 "25 1 16.0 8.6 3.7 22.6 9.5 " 0.5 16.3 8.0 3.5 22.8 9.2 " 2 13.5 8.3 3.8 22.0 9.1 "26 1 16.1 8.6 3.7 22.6 9.6 " 0.5 16.4 8.0 3.6 23.2 9.4 " 2 12.4 7.9 4.2 21.6 9.5 "27 1 13.0 8.7 4.3 20.7 10.4 " 0.5 14.1 8.0 4.0 22.3 10.0 " 2 13.5 8.1 3.9 22.0 9.6 "28 1 16.0 8.6 3.7 22.7 8.8 " 0.5 16.5 8.0 3.5 23.4 9.5 " 2 12.2 7.7 4.3 21.6 9.2 "29 1 12.1 8.6 4.5 20.7 10.3 " 0.5 14.2 8.3 4.3 22.8 10.1 " 2 13.4 8.2 4.1 22.2 9.6 "30 1 16.2 8.9 4.0 22.7 9.7 " 0.5 16.4 8.2 3.7 23.2 9.3 " 2 7.2 10.1 4.3 20.8 10.9 "31 1 7.8 12.6 4.4 22.0 11.5 " 0.5 10.1 13.1 4.1 23.0 10.7 " 2 14.0 7.9 3.7 21.8 9.5 "32 1 16.0 8.5 3.6 22.5 9.6 " 0.5 16.3 8.2 3.4 22.9 9.2 " 2 12.1 7.7 3.8 21.2 9.2 "33 1 13.2 8.5 4.1 20.5 10.1 " 0.5 14.2 7.9 3.7 22.0 9.8 " 2 13.2 7.8 3.9 21.2 9.2 "34 1 16.1 8.5 3.6 21.8 9.3 " 0.5 16.3 7.9 3.4 22.4 9.1 " 2 7.6 10.2 4.4 20.2 10.7 "35 1 7.9 12.1 4.5 21.1 11.4 " 0.5 10.1 13.2 4.0 22.7 10.6 " 2 7.2 9.3 4.2 22.0 10.6 "36 1 7.6 10.7 4.6 22.7 10.9 " 0.5 10.0 8.3 4.0 22.6 11.2 " 2 7.3 10.2 4.3 20.5 10.5 "37 1 7.8 12.3 4.5 21.6 11.7 " 0.5 10.3 13.5 4.0 23.0 11.0 "______________________________________

The formulation of the growth regulator of this invention is further illustrated by the following Examples. It should be understood that the active compounds, carriers and the mixing proportions of the formulation of this invention are not limited to the Examples. Incidentially, all parts in the following Examples are by weight.
EXAMPLE 1
______________________________________Compound No. 4 50 (parts)Sodium alkylsulfate 2.5Polyoxyethylene alkylphenyl ether 2.5Clay 45______________________________________
The components above were mixed uniformly and pulverized to form wettable powder.
EXAMPLE 2
______________________________________Compound No. 1 10 (parts)Sodium lignin sulfonate 1Bentonite 30Talc 59______________________________________
All the components were mixed uniformly and formed into granules by the use of a granulator.
EXAMPLE 3
______________________________________Compound No. 2 10 (parts)Polyoxyethylene alkylphenyl ether 7Calcium alkylarylsulfonate 3Xylene 60Cyclohexanone 20______________________________________
All the components were thoroughly mixed to form an emulsion.
EXAMPLE 4
______________________________________Compound No. 14 50 (parts)Sodium alkylsulfate 2.5Polyoxyethylene alkylphenyl ether 2.5Clay 45______________________________________
All the components were mixed uniformly and pulverized to form wettable powder.
EXAMPLE 5
______________________________________Compound No. 17 10 (parts)Sodium lignin sulfonate 1Bentonite 30Talc 59______________________________________
All the components were mixed uniformly and formed into granules with use of a granulator.
EXAMPLE 6
______________________________________Compound No. 18 10 (parts)Polyoxyethylene alkylphenyl ether 7Calcium alkylarylsulfonate 3Xylene 60Cyclohexanone 20______________________________________
All the components were mixed uniformly to form an emulsion.

Number	Date	Country
55-135112	Sep 1980	JPX
56-71424	May 1981	JPX
56-102257	Jul 1981	JPX

Number	Date	Country
53-72825	Jun 1978	JPX
2047701	Dec 1980	GBX

Isonicotinanilide derivatives, plant growth regulating compositions and use

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