A plant growth regulator special for sweet potato and its preparation method and application
By combining anti-dampness, cyclopropionic acid amide, and Sophora japonica extract, the problem of synchronizing the control of aboveground growth and promotion of underground growth of sweet potato growth regulators was solved, achieving high yield increase and quality improvement of sweet potatoes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUBEI MAOSHENG BIOLOGY CO LTD
- Filing Date
- 2026-06-26
- Publication Date
- 2026-07-31
AI Technical Summary
Existing sweet potato growth regulators are difficult to synchronize between controlling aboveground growth and promoting underground tuber growth, resulting in decreased yield and quality, and also have problems such as long soil residue period and high risk of phytotoxicity.
A compound of anti-rotamine, cyclopropionic acid amide, and Sophora japonica extract (the main component of which is quercetin) is used to effectively control the growth of sweet potato stems and leaves and increase tuber yield by inhibiting gibberellin synthesis, interfering with auxin transport, and providing antioxidant protection.
It effectively inhibited excessive growth of sweet potato stems and leaves, increased tuber yield, and prevented premature senescence of functional leaves, achieving the effect of controlling excessive growth without suppressing yield, increasing yield and improving quality.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of plant growth regulator technology, specifically relating to a sweet potato-specific plant growth regulator, its preparation method, and its application. Background Technology
[0002] Sweet potato is an important food and cash crop, and its economic yield mainly depends on the enlargement of its underground tubers. Under conditions of high temperature and heavy rainfall, or excessive application of nitrogen fertilizer, sweet potatoes are prone to excessive vegetative growth, with rapid elongation of the main stem and abundant lateral branching. A large amount of photosynthetic products are consumed in the above-ground vegetative growth, leading to reduced nutrient allocation to the tubers and a significant decline in yield and quality. Therefore, scientifically controlling excessive above-ground growth and promoting the efficient translocation of assimilated products to the tubers are key cultivation measures for achieving high yield and quality sweet potatoes.
[0003] Currently, commonly used chemical methods for controlling excessive growth in production mainly rely on gibberellin synthesis inhibitors, such as paclobutrazol and uniconazole. These agents shorten internode length by inhibiting gibberellin biosynthesis, but they generally have long residual periods in the soil, a high risk of phytotoxicity in subsequent crops, and the intensity of growth control is difficult to control precisely. Excessive inhibition often leads to premature yellowing and senescence of leaves, severe reduction in functional leaf area, and limited total photosynthetic products, ultimately resulting in a passive situation where growth control does not increase yield or even reduces yield. Anti-growth amine, as a novel isonicotinic acid-based growth inhibitor with high activity and low residue, can effectively block endogenous gibberellin synthesis and inhibit stem elongation, but when used alone, it can still easily cause excessive dwarfing of plants and premature senescence of functional leaves.
[0004] Cyclopropionic acid amide is an auxin transport inhibitor that interferes with the polar transport of indoleacetic acid, weakens apical dominance, promotes lateral branch development, and induces more assimilates to the underground tubers by altering sink-source signals. However, cyclopropionic acid amide has a weak direct inhibitory effect on main stem elongation and often fails to effectively suppress the rapid growth of sweet potato aboveground parts when applied alone. Quercetin in Sophora japonica flower bud extract possesses both natural auxin transport inhibitory activity and reactive oxygen species scavenging ability, which can inhibit internode elongation, making the plant compact, and delay the senescence of functional leaves. However, research on the systematic combination of quercetin or Sophora japonica flower bud extract with the above-mentioned synthetic regulators for controlling excessive growth in sweet potato is still insufficient.
[0005] Existing two-component compound formulations struggle to simultaneously achieve the multiple regulatory objectives of "robust growth control," "continuous growth promotion," and "prevention of premature aging." Without antioxidant protection components, plants are prone to premature aging after growth regulation; without gibberellin synthesis inhibitors, the control of excessive stem and leaf growth is insufficient; and without auxin transport regulators, lateral branch development and sink control are inadequate, failing to fully unleash the potential for increased tuber yield. Therefore, there is an urgent need to develop a sweet potato-specific plant growth regulator that works synergistically across multiple targets, including gibberellin synthesis inhibition, auxin transport regulation, and antioxidant protection, to simultaneously inhibit excessive stem and leaf growth, increase tuber yield, and prevent premature aging of functional leaves. Summary of the Invention
[0006] The purpose of this invention is to provide a plant growth regulator specifically for sweet potatoes, which can effectively inhibit the growth of sweet potato stems and leaves and increase the yield of sweet potato tubers.
[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A sweet potato-specific plant growth regulator comprises the following raw materials in weight percentages: anti-dampness 1-15%, cyclopropionic acid amide 0.5-7%, Sophora japonica flower extract 1-5%, wetting and penetrating agent 2-5%, stabilizer 0.5-2%, dispersant 5-8%, and the balance being filler.
[0008] Furthermore, the preparation method of Sophora japonica flower extract is as follows: (1) Raw material preparation: Take coarse powder of Sophora japonica flowers and put it into a round bottom flask; prepare 70% ethanol and add hydrochloric acid to make the hydrochloric acid concentration 1.5% (v / v) to obtain an acid-alcohol solution; (2) Heating and reflux, simultaneous extraction and hydrolysis: Add the acid-alcohol solution to the Sophora japonica powder, the ratio of Sophora japonica powder to acid-alcohol solution is 1:15 (m / v), heat to boiling, and then reflux in a 90℃ water bath for 1.5-2 hours; (3) After the reaction is complete, filter while hot, separate the filtrate, rinse the filter residue with a small amount of hot 70% ethanol, combine the filtrates, concentrate the filtrate under reduced pressure to one-quarter of the original volume, add twice the volume of pure water to the concentrate and mix well, adjust the pH to 2-3, refrigerate at 4℃ for more than 12 hours to crystallize, filter and collect the crystals, rinse the precipitate with cold water to obtain the crude product. (4) Dissolve the crude product with 95% ethanol by heating. The ratio of crude product to 95% ethanol is 1:15. Add 1-3% of activated carbon by weight of crude product, stir and boil for 5-10 minutes to decolorize. Filter, cool and crystallize, and dry to obtain Sophora japonica extract.
[0009] Furthermore, the main component of the sophora japonica extract is quercetin.
[0010] Furthermore, the wetting and penetrating agent is composed of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether, with a mass ratio of 2:1.
[0011] Furthermore, the stabilizer is ascorbic acid and potassium dihydrogen phosphate in a mass ratio of 1:2.
[0012] Furthermore, the dispersant is sodium lignosulfonate.
[0013] Furthermore, the filler is diatomaceous earth.
[0014] A method for preparing a sweet potato-specific plant growth regulator includes the following steps: To prepare Sophora japonica extract, weigh each raw material according to the mass percentage. First, mix the fatty alcohol polyoxyethylene ether in the wetting and penetrating agent with a portion of diatomaceous earth to obtain a premixed material. Then, add the premixed material, anti-acid, cyclopropionic acid amide, Sophora japonica extract, sodium dodecyl sulfate, stabilizer, dispersant, and remaining diatomaceous earth into a mixer and stir thoroughly for 15-30 minutes to obtain a mixed powder. Finally, pulverize the mixed powder using an air jet mill and pass it through a 300-mesh sieve to obtain a sweet potato-specific plant growth regulator.
[0015] The present invention also provides the application of the sweet potato-specific plant growth regulator, specifically for inhibiting excessive vegetative growth of sweet potato stems and leaves and increasing tuber yield.
[0016] All raw materials used in this invention are commercially available.
[0017] The plant growth regulator prepared in this invention is a wettable powder.
[0018] The plant growth regulator of this invention is used after being diluted 2000 times.
[0019] Anti-growth amine belongs to the isonicotinic acid class of plant growth inhibitors. By inhibiting key enzymes in the gibberellin biosynthesis process, it blocks the synthesis of endogenous gibberellins, thereby significantly shortening the internode length of crops, resulting in a compact plant type and effectively inhibiting excessive vegetative growth in sweet potatoes. Cyclopropionic acid amide, on the other hand, is an auxin transport inhibitor that can interfere with the polar transport of indole-3-acetic acid from the shoot tip to the base, weakening apical dominance, promoting lateral branch development, and possibly inducing more assimilates to be allocated to the underground tubers by altering sink-source signals.
[0020] Anti-growth amine inhibits the supply of gibberellins that stimulate stem elongation at the source, thus "controlling upward growth." Cyclopropionic acid amide, on the other hand, mitigates the excessive dwarfing and premature aging that may be caused by a single strong inhibitor by adjusting the distribution of auxin flow, while maintaining moderate lateral branch growth, expanding photosynthetic area, and enhancing root and tuber accumulation, thus "promoting downward growth." This two-way regulation not only effectively prevents excessive vegetative growth in sweet potatoes but also achieves the goal of controlling excessive growth without suppressing yield, and increasing both yield and quality.
[0021] The main component of the Sophora japonica extract added in this invention is quercetin. As an inhibitor of auxin transport, quercetin interferes with the directional flow of indoleacetic acid from the stem tip to the base. With downward auxin transport blocked, the auxin concentration in the internode elongation zone decreases, the driving force for cell elongation weakens, and the internodes naturally shorten. Simultaneously, quercetin also induces ethylene synthesis. Ethylene, through its physiological effects of promoting lateral thickening of the stem and synergistically inhibiting longitudinal growth, further contributes to a compact plant structure.
[0022] Antioxidant properties delay leaf senescence: Quercetin has antioxidant properties, which can remove the large amount of reactive oxygen species produced during excessive growth, preventing premature yellowing and shedding of lower leaves. This allows the plant to maintain sufficient photosynthetic area after growth is controlled, avoiding yield loss. The combination of quercetin extract and anti-growth amine + cyclopropionic acid amide is equivalent to a double lock from two dimensions: "blocking auxin transport" and "interrupting gibberellin synthesis," while simultaneously providing antioxidant protection for the leaves, achieving the ideal plant type of "short and sturdy without premature senescence, controlling growth while promoting growth in the lower body."
[0023] Beneficial effects This invention's plant growth regulator, through the combination of three main active ingredients—sophora japonica extract, anti-dampness amine, and cyclopropionic acid amide—optimizes the growth of sweet potato plants through bidirectional regulation that controls growth at the top and promotes growth at the bottom. This allows photosynthetic products to be transported and accumulated more efficiently in the tubers, thereby achieving the effect of controlling excessive growth without suppressing yield, increasing yield, and improving quality.
[0024] The method for preparing the plant growth regulator of this invention involves premixing, mixing, and air jet milling, which is simple to operate and suitable for large-scale production. The product is a wettable powder that can be diluted and sprayed in the field, making it easy to apply and promote on a large scale. It has good potential to increase yield and income in sweet potato production. Detailed Implementation
[0025] The technical solution of the present invention will be further described below with reference to specific embodiments, but it is not limited thereto.
[0026] Example 1 A sweet potato-specific plant growth regulator comprises the following raw materials in weight percentages: 1% anti-dampness amine, 0.5% cyclopropionic acid amide, 1% Sophora japonica extract, 2% wetting and penetrating agent, 0.5% stabilizer, 5% dispersant, and the balance being filler.
[0027] The preparation method of Sophora japonica flower extract is as follows: (1) Raw material preparation: Take coarse powder of Sophora japonica flowers and put it into a round bottom flask; prepare 70% ethanol and add hydrochloric acid to make the hydrochloric acid concentration 1.5% (v / v) to obtain an acid-alcohol solution; (2) Heating and reflux, simultaneous extraction and hydrolysis: Add the acid-alcohol solution to the Sophora japonica powder, the ratio of Sophora japonica powder to acid-alcohol solution is 1:15 (m / v), heat to boiling, and then reflux in a 90℃ water bath for 1.5-2 hours; (3) After the reaction is complete, filter while hot, separate the filtrate, rinse the filter residue with a small amount of hot 70% ethanol, combine the filtrates, concentrate the filtrate under reduced pressure to one-quarter of the original volume, add twice the volume of pure water to the concentrate and mix well, adjust the pH to 2-3, refrigerate at 4℃ for more than 12 hours to crystallize, filter and collect the crystals, rinse the precipitate with cold water to obtain the crude product. (4) Dissolve the crude product with 95% ethanol by heating. The ratio of crude product to 95% ethanol is 1:15. Add 1-3% of activated carbon by weight of crude product, stir and boil for 5-10 minutes to decolorize. Filter, cool and crystallize, and dry to obtain Sophora japonica extract.
[0028] The wetting and penetrating agent is composed of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether, with a mass ratio of 2:1.
[0029] The stabilizer is ascorbic acid and potassium dihydrogen phosphate, with a mass ratio of 1:2.
[0030] The dispersant is sodium lignosulfonate.
[0031] The filler is diatomaceous earth.
[0032] A method for preparing a sweet potato-specific plant growth regulator includes the following steps: To prepare Sophora japonica extract, weigh each raw material according to the mass percentage. First, mix the fatty alcohol polyoxyethylene ether in the wetting and penetrating agent with a portion of diatomaceous earth to obtain a premixed material. Then, add the premixed material, anti-acid, cyclopropionic acid amide, Sophora japonica extract, sodium dodecyl sulfate, stabilizer, dispersant, and remaining diatomaceous earth into a mixer and stir thoroughly for 15-30 minutes to obtain a mixed powder. Finally, pulverize the mixed powder using an air jet mill and pass it through a 300-mesh sieve to obtain a sweet potato-specific plant growth regulator.
[0033] Example 2 A sweet potato-specific plant growth regulator comprises the following raw materials in weight percentages: anti-dampness 7%, cyclopropionic acid amide 4%, Sophora japonica extract 3%, wetting and penetrating agent 4%, stabilizer 1%, dispersant 6%, and the balance being filler.
[0034] The preparation method of Sophora japonica flower extract is as follows: (1) Raw material preparation: Take coarse powder of Sophora japonica flowers and put it into a round bottom flask; prepare 70% ethanol and add hydrochloric acid to make the hydrochloric acid concentration 1.5% (v / v) to obtain an acid-alcohol solution; (2) Heating and reflux, simultaneous extraction and hydrolysis: Add the acid-alcohol solution to the Sophora japonica powder, the ratio of Sophora japonica powder to acid-alcohol solution is 1:15 (m / v), heat to boiling, and then reflux in a 90℃ water bath for 1.5-2 hours; (3) After the reaction is complete, filter while hot, separate the filtrate, rinse the filter residue with a small amount of hot 70% ethanol, combine the filtrates, concentrate the filtrate under reduced pressure to one-quarter of the original volume, add twice the volume of pure water to the concentrate and mix well, adjust the pH to 2-3, refrigerate at 4℃ for more than 12 hours to crystallize, filter and collect the crystals, rinse the precipitate with cold water to obtain the crude product. (4) Dissolve the crude product with 95% ethanol by heating. The ratio of crude product to 95% ethanol is 1:15. Add 1-3% of activated carbon by weight of crude product, stir and boil for 5-10 minutes to decolorize. Filter, cool and crystallize, and dry to obtain Sophora japonica extract.
[0035] The wetting and penetrating agent is composed of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether, with a mass ratio of 2:1.
[0036] The stabilizer is ascorbic acid and potassium dihydrogen phosphate, with a mass ratio of 1:2.
[0037] The dispersant is sodium lignosulfonate.
[0038] The filler is diatomaceous earth.
[0039] A method for preparing a sweet potato-specific plant growth regulator includes the following steps: To prepare Sophora japonica extract, weigh each raw material according to the mass percentage. First, mix the fatty alcohol polyoxyethylene ether in the wetting and penetrating agent with a portion of diatomaceous earth to obtain a premixed material. Then, add the premixed material, anti-acid, cyclopropionic acid amide, Sophora japonica extract, sodium dodecyl sulfate, stabilizer, dispersant, and remaining diatomaceous earth into a mixer and stir thoroughly for 15-30 minutes to obtain a mixed powder. Finally, pulverize the mixed powder using an air jet mill and pass it through a 300-mesh sieve to obtain a sweet potato-specific plant growth regulator.
[0040] Example 3 A sweet potato-specific plant growth regulator comprises the following raw materials in weight percentages: 15% anti-dampness amine, 7% cyclopropionic acid amide, 5% Sophora japonica flower extract, 5% wetting and penetrating agent, 2% stabilizer, 8% dispersant, and the balance being filler.
[0041] The preparation method of Sophora japonica flower extract is as follows: (1) Raw material preparation: Take coarse powder of Sophora japonica flowers and put it into a round bottom flask; prepare 70% ethanol and add hydrochloric acid to make the hydrochloric acid concentration 1.5% (v / v) to obtain an acid-alcohol solution; (2) Heating and reflux, simultaneous extraction and hydrolysis: Add the acid-alcohol solution to the Sophora japonica powder, the ratio of Sophora japonica powder to acid-alcohol solution is 1:15 (m / v), heat to boiling, and then reflux in a 90℃ water bath for 1.5-2 hours; (3) After the reaction is complete, filter while hot, separate the filtrate, rinse the filter residue with a small amount of hot 70% ethanol, combine the filtrates, concentrate the filtrate under reduced pressure to one-quarter of the original volume, add twice the volume of pure water to the concentrate and mix well, adjust the pH to 2-3, refrigerate at 4℃ for more than 12 hours to crystallize, filter and collect the crystals, rinse the precipitate with cold water to obtain the crude product. (4) Dissolve the crude product with 95% ethanol by heating. The ratio of crude product to 95% ethanol is 1:15. Add 1-3% of activated carbon by weight of crude product, stir and boil for 5-10 minutes to decolorize. Filter, cool and crystallize, and dry to obtain Sophora japonica extract.
[0042] The wetting and penetrating agent is composed of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether, with a mass ratio of 2:1.
[0043] The stabilizer is ascorbic acid and potassium dihydrogen phosphate, with a mass ratio of 1:2.
[0044] The dispersant is sodium lignosulfonate.
[0045] The filler is diatomaceous earth.
[0046] A method for preparing a sweet potato-specific plant growth regulator includes the following steps: To prepare Sophora japonica extract, weigh each raw material according to the mass percentage. First, mix the fatty alcohol polyoxyethylene ether in the wetting and penetrating agent with a portion of diatomaceous earth to obtain a premixed material. Then, add the premixed material, anti-acid, cyclopropionic acid amide, Sophora japonica extract, sodium dodecyl sulfate, stabilizer, dispersant, and remaining diatomaceous earth into a mixer and stir thoroughly for 15-30 minutes to obtain a mixed powder. Finally, pulverize the mixed powder using an air jet mill and pass it through a 300-mesh sieve to obtain a sweet potato-specific plant growth regulator.
[0047] Comparative Example 1 Compared with Example 3, this comparative example is identical to Example 3 except that no Sophora japonica extract was added. All other raw materials and steps are the same as in Example 3.
[0048] Comparative Example 2 Compared with Example 3, this comparative example is identical to Example 3 except that no anti-anti-amine is added. All other raw materials and steps are the same as in Example 3.
[0049] Comparative Example 3 Compared with Example 3, this comparative example is identical to Example 3 except that cyclopropionic acid amide is not added.
[0050] Performance testing The sweet potato variety used in the experiment was Yanshu 25. Seven treatment groups were set up, using plant growth regulators from Examples 1-3 and Comparative Examples 1-3, respectively. A water treatment was also included as a control. Each treatment was replicated three times. The plant growth regulators for each treatment group were diluted 2000 times before use. The experiment used a randomized block design, with single-row, double-row planting. The row width was 0.85 meters, the row length was 10 meters, and each treatment plot had 8 rows, with a plot area of 30 square meters. 2 Each treatment area was surrounded by a 1-meter-wide protective row. Specific application times and dosages (based on the amount of plant growth regulator raw materials prepared per acre for each treatment group) are shown in Table 1.
[0051] Table 1. Application time and dosage for each treatment group
[0052] Three representative plants with normal growth were randomly selected from each treatment as samples. Aboveground measurements were conducted before and after each growth control measure, including main stem length and lateral branch length. Yield was measured before harvest. Three sampling points with uniform growth were randomly selected from each treatment, and 10 plants were continuously sampled from each point. The fresh weight of aboveground stems and leaves and the fresh weight of underground tubers were measured. The main stem growth multiple, lateral branch growth multiple, and T / R value were calculated using the following formulas. After seed potatoes were harvested, seedlings were raised in a greenhouse. The weight of tubers laid in the nursery was recorded for each treatment. After emergence, seedlings were cut three times consecutively, and the total number of emergences was counted, and the number of tuber emergences was calculated. Main stem growth multiple = (main stem length after growth control - main stem length before growth control) / main stem length before growth control; Lateral branch growth multiple = (lateral branch length after growth control - lateral branch length before growth control) / lateral branch length before growth control; T / R = aboveground fresh weight / underground fresh weight; Number of tuber emergences = total number of emergences / weight of laid tubers; The above statistical data are shown in Table 2.
[0053] Table 2 Effects of different plant growth regulators on the growth of Yanshu 25
[0054] As shown in Table 2, compared with Comparative Examples 1-3, which modified the plant growth regulator of the present invention, the plant growth regulator of the present invention can effectively inhibit the excessive growth of the aboveground parts of sweet potato and increase the yield of sweet potato.
[0055] Compared to Example 3, Comparative Example 1, lacking the antioxidant protection of Sophora japonica extract, was prone to over-controlling the plant growth, leading to slight premature aging, slower growth, and a lower main stem growth ratio. The absence of quercetin, an inhibitor of auxin transport, limited the ability of cyclopropionic acid amide to promote lateral branching, and the excessive control resulted in weaker overall growth and a lower lateral branch growth ratio. Furthermore, due to excessive inhibition of aboveground biomass, the underground tubers were less affected, resulting in a very low T / R ratio. Regarding yield, although the growth control effect was good, the lack of quercetin's antioxidant protection for leaves caused premature aging of functional leaves, leading to insufficient accumulation of photosynthetic products in the mid-to-late stages, resulting in a lower yield than Example 3. However, due to the continued basic growth control, the yield was still higher than the water control. Looking at the tuber dry matter percentage and seedling number, due to the limited total photosynthetic products, dry matter accumulation and seed tuber vigor were slightly lower than in Example 3, and even slightly lower than in Example 1 with the lowest dosage.
[0056] Compared to Example 3, Comparative Example 2 lacked the anti-gibberellin amine that inhibits gibberellin synthesis, resulting in a lack of the main growth regulator and inability to effectively block the elongation of the main stem. However, the dual inhibition of auxin transport by cyclopropionic acid amide and quercetin still provided some suppression of apical growth, with its growth control effect falling between that of the water control and Example 1. Both active ingredients used are auxin transport inhibitors, which can strongly eliminate apical dominance, leading to very vigorous lateral branch sprouting and growth, with a significantly higher lateral branch growth rate than in Example 3. However, due to intense overall nutrient competition, the growth was not as rampant as in the water control after the complete breakdown of apical dominance. The aboveground stem and leaf growth remained relatively vigorous, and the proportion of nutrients allocated to the underground decreased, resulting in a significant increase in the T / R value compared to Example 3. In addition, due to the inability to control the excessive aboveground growth, a large amount of photosynthetic products were consumed in stem and leaf formation, affecting tuber yield. Although the yield was higher than that of the water control, it was lower than that of the other examples. The tuber dry matter percentage decreased due to the diversion of photosynthetic products to the stems and leaves. Regarding the number of seedlings, although tuber yield was impaired, the number of seedlings remained relatively stable during tuber seedling cultivation.
[0057] Compared to Example 3, Comparative Example 3 showed that the anti-gibberellin agent strongly inhibited gibberellin and had a strong ability to control excessive growth. Therefore, the growth rate of the main stem was significantly lower than that of Comparative Example 2 and the water control. However, Comparative Example 3 lacked the combination of cyclopropionic acid amide, so the "balance" of growth control was not as good as that of Example 3. Lateral branch growth rate: After controlling the main stem with anti-gibberellin agent, lateral branches grew due to nutrient redistribution, so it was higher than that of Example 2 and Example 3. However, because the apex still had some dominance, it was slightly lower than that of the water control and Comparative Example 2. Regarding the T / R value, the plant type was well controlled, the aboveground biomass was moderate, and it could effectively promote nutrient transport downwards. The T / R value was close to that of Example 1. In terms of yield, this combination had a good growth control effect and quercetin to protect the leaves, increasing the allocation of photosynthetic products to the tubers, resulting in a higher yield. However, due to the lack of precise regulation and mitigation of cyclopropionic acid amide, the overall root and stem coordination was not as good as that of the three-component combination in Example 3, so the yield was lower than that of Example 3. In terms of tuber dry matter content and seedling number, due to good growth control and leaf preservation, the dry matter accumulation is sufficient and the tuber vigor is good, but it is inferior to the most perfect three-component synergistic example 3.
[0058] It should be noted that the above embodiments are merely some preferred embodiments of the present invention, and not all embodiments. Obviously, based on the above embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.
Claims
1. A plant growth regulator specifically for sweet potatoes, characterized in that, The raw materials include the following percentages by weight: anti-adhesive amine 1-15%, cyclopropionic acid amide 0.5-7%, Sophora japonica flower extract 1-5%, wetting and penetrating agent 2-5%, stabilizer 0.5-2%, dispersant 5-8%, and the balance being filler; The preparation method of the Sophora japonica extract is as follows: (1) Raw material preparation: Take coarse powder of Sophora japonica flowers and put it into a round bottom flask; prepare 70% ethanol and add hydrochloric acid to make the hydrochloric acid concentration 1.5% (v / v) to obtain an acid-alcohol solution; (2) Heating and reflux, simultaneous extraction and hydrolysis: Add the acid-alcohol solution to the Sophora japonica powder, the ratio of Sophora japonica powder to acid-alcohol solution is 1:15 (m / v), heat to boiling, and then reflux in a 90℃ water bath for 1.5-2 hours; (3) After the reaction is complete, filter while hot, separate the filtrate, rinse the filter residue with a small amount of hot 70% ethanol, combine the filtrates, concentrate the filtrate under reduced pressure to one-quarter of the original volume, add twice the volume of pure water to the concentrate and mix well, adjust the pH to 2-3, refrigerate at 4℃ for more than 12 hours to crystallize, filter and collect the crystals, rinse the precipitate with cold water to obtain the crude product. (4) Dissolve the crude product with 95% ethanol by heating. The ratio of crude product to 95% ethanol is 1:
15. Add 1-3% of activated carbon by weight of crude product, stir and boil for 5-10 minutes to decolorize, filter, cool and crystallize, and dry to obtain Sophora japonica extract. The wetting and penetrating agent is composed of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether, with a mass ratio of 2:
1. The stabilizer is ascorbic acid and potassium dihydrogen phosphate, with a mass ratio of 1:
2. The dispersant is sodium lignosulfonate.
2. The sweet potato-specific plant growth regulator according to claim 1, characterized in that, The filler is diatomaceous earth.
3. The sweet potato-specific plant growth regulator according to claim 1, characterized in that, The plant growth regulator is a wettable powder.
4. A method for preparing the sweet potato-specific plant growth regulator according to claim 1, characterized in that, Preparation includes the following steps: To prepare Sophora japonica extract, weigh each raw material according to the mass percentage. First, mix the fatty alcohol polyoxyethylene ether in the wetting and penetrating agent with a portion of diatomaceous earth to obtain a premixed material. Then, add the premixed material, anti-acid, cyclopropionic acid amide, Sophora japonica extract, sodium dodecyl sulfate, stabilizer, dispersant, and remaining diatomaceous earth into a mixer and stir thoroughly for 15-30 minutes to obtain a mixed powder. Finally, pulverize the mixed powder using an air jet mill and pass it through a 300-mesh sieve to obtain a sweet potato-specific plant growth regulator.
5. The application of the sweet potato-specific plant growth regulator according to claim 1, characterized in that, Specifically, it is used to inhibit excessive vegetative growth of sweet potato stems and leaves and increase tuber yield.