A fresh food type sweet potato yield-increasing and quality-regulating agent fertilizer, and an application method and application thereof

Abstract

The application discloses a fresh-consumption type sweet potato yield-increasing and quality-improving regulator fertilizer and an application method and application thereof, and belongs to the field of agricultural technology. The regulator fertilizer comprises a plant growth regulator (uniconazole and mepiquat chloride), a nutrient element fertilizer (a phosphorus source and a potassium source), a biological stimulant and a trace element fertilizer. Preferably, the biological stimulant comprises alginic acid and amino acid, and the trace element fertilizer comprises zinc, boron and iron. The application further provides an application method of the fertilizer, which comprises root dipping treatment and foliar spraying. The application realizes comprehensive regulation on the growth of sweet potato by compounding uniconazole and mepiquat chloride and combining a phosphorus and potassium source, trace elements, a biological stimulant and a synergist, and has remarkable effects in controlling stem and vine growth, promoting tuber enlargement, improving yield and quality, enhancing plant stress resistance and the like, and is low in cost, convenient to apply and has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of agricultural technology, specifically relating to a high-quality growth regulator fertilizer for fresh sweet potatoes and its application method and application. Background Technology

[0002] sweet potato( Ipomoea batatas (L.) Lam. Sweet potatoes are an important food, feed, and industrial raw material crop in my country, and also a popular health food among consumers. Fresh-eating sweet potatoes have high requirements for tuber shape, color, taste, and nutritional quality. However, during sweet potato cultivation, improper water and fertilizer management, especially excessive nitrogen fertilizer in the soil, often leads to excessive vegetative growth (commonly known as "vigorous growth") of the above-ground stems and vines, resulting in poor development of the underground tubers and an excessively high "T / R value" (fresh weight ratio of above-ground to underground parts), which seriously affects yield and quality.

[0003] To control excessive vegetative growth and promote tuber enlargement, plant growth regulators such as paclobutrazol, uniconazole, and chlormequat chloride are commonly used in agricultural production. However, the use of these regulators alone often leads to problems such as excessive potency, phytotoxicity, short-lasting effects, or incomplete efficacy. Furthermore, relying solely on regulators to control excessive vegetative growth while neglecting the supplementation of nutrients and the enhancement of the plant's own resistance makes it difficult to achieve truly high yields and quality.

[0004] Patent application CN119143543A discloses an organic water-soluble fertilizer for sweet potato to control excessive growth, increase yield, and improve quality. Its core principle lies in selectively adsorbing excess nitrate ions in the soil through modified ion exchange resin and activated carbon adsorbent, thereby reducing nitrogen absorption and indirectly controlling excessive growth. This technical solution focuses on soil environment improvement but does not address a comprehensive solution for directly regulating plant growth and metabolism through foliar application, nor does it mention the application of biostimulants in alleviating pesticide damage, promoting absorption, increasing yield, and improving quality.

[0005] Therefore, developing a comprehensive foliar regulation program that integrates growth control, stunting, stress resistance, and efficiency enhancement is of great significance for improving the yield and quality of fresh sweet potatoes. Summary of the Invention

[0006] This invention addresses the problems in sweet potato production, such as excessive vine growth, insufficient tuber enlargement, low yield and quality, and weak stress resistance. It provides a high-quality, fresh-eating sweet potato yield-increasing regulator fertilizer. Through the synergistic effect of uniconazole, mepiquat chloride to control excessive growth, phosphorus and potassium nutrition supply, alginate biostimulants, chelated zinc, boron, and iron trace elements, and synergists, it achieves a comprehensive effect of controlling excessive vine growth and promoting excessive tuber growth, improving quality and yield, and enhancing stress resistance. Moreover, it is easy to apply, low in cost, and safe and reliable.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] Firstly, a high-quality growth regulator fertilizer for fresh-eating sweet potatoes is provided, comprising the following components:

[0009] A plant growth regulator comprising uniconazole and mepiquat chloride;

[0010] Nutrient fertilizer, wherein the nutrient fertilizer contains a phosphorus source and a potassium source;

[0011] Biostimulants; and

[0012] Micronutrient fertilizer.

[0013] As a specific implementation method of the present invention, the biostimulant is selected from one or more of alginic acid, seaweed extract, amino acids, humic acid, and chitin.

[0014] As a specific implementation method of the present invention, the biostimulant comprises alginate or its derivatives, and amino acids.

[0015] As a specific implementation method of the present invention, the trace element fertilizer contains zinc, boron and iron.

[0016] As a specific implementation method of the present invention, the trace element fertilizer exists in a chelated form.

[0017] As a specific implementation method of the present invention, the trace element fertilizer comprises EDTA-Zn, EDTA-Fe and borax.

[0018] As a specific implementation method of the present invention, based on foliar spraying with 30 kg of water per acre, the content of each component is as follows:

[0019] Uniconazole 1.5 - 3.0 g;

[0020] Mepiquat chloride 2.0 - 3.0 grams;

[0021] 80-100 grams of phosphorus and potassium sources, calculated as potassium dihydrogen phosphate;

[0022] Biostimulant 5-10 ml or g, based on the effective amount;

[0023] 10-15 grams of micronutrient fertilizer.

[0024] As a specific implementation method of the present invention, the regulator fertilizer further includes a synergist, which is selected from one or more of amino acids, sodium nitrophenolate, amino acid esters, and brassinolide.

[0025] As a specific implementation method of the present invention, the synergist is glycine.

[0026] As a specific implementation method of the present invention, the phosphorus source and potassium source are potassium dihydrogen phosphate.

[0027] Secondly, the present invention also provides a method for applying the above-mentioned regulator fertilizer, including root dipping treatment and / or foliar spraying.

[0028] As a specific implementation method of the present invention, the root dipping treatment is carried out during sweet potato transplanting, in which the base of the sweet potato seedlings is soaked in a diluted regulator fertilizer solution.

[0029] As a specific implementation method of the present invention, the concentration of the diluted regulator fertilizer solution is 30%-70% of the above-mentioned formula concentration.

[0030] As a specific implementation method of the present invention, the foliar spraying is carried out during the tuber enlargement period of sweet potato.

[0031] As a specific implementation method of the present invention, spraying is carried out 1-3 times within 60-110 days after planting, and more preferably spraying once every 7-10 days for 2-3 consecutive times.

[0032] Thirdly, the present invention also provides the application of the above-mentioned regulator fertilizer or the above-mentioned application method in the cultivation of fresh sweet potatoes, for promoting tuber enlargement, controlling excessive vine growth, improving stress resistance and / or improving sweet potato quality.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] I. Collaborative control of excessive growth yields significant results:

[0035] The regulator fertilizer provided by this invention systematically regulates the physiological metabolism of fresh-eating sweet potatoes through the scientific formulation and synergy of specific functional components, thereby simultaneously resolving the contradiction in their production where "high yield, high quality, and stress resistance" are difficult to achieve simultaneously. Its synergistic mechanism is specifically manifested in the following four interconnected levels:

[0036] 1. Growth regulation layer: The combination of uniconazole and mepiquat chloride precisely optimizes the source-sink relationship, laying the foundation for high yield.

[0037] As a potent inhibitor of gibberellin biosynthesis, uniconazole can significantly inhibit the division and elongation of shoot apical meristem cells, effectively control the excessive vegetative growth of aboveground stems ("source control"), and reduce the ineffective consumption of photosynthetic products.

[0038] Mepiquat chloride, as a mild plant growth retardant, mainly works by inhibiting the synthesis of endogenous gibberellins while regulating the levels of other endogenous hormones, and its effects are relatively mild.

[0039] Synergistic effect: The combination of the two achieves a complementarity between "strong and rapid inhibition" and "mild and long-lasting regulation". This combination can strongly guide the transport and distribution of photosynthetic products from the above-ground stems and leaves ("source") to the underground tubers ("sink") without excessively inhibiting the photosynthetic function of the leaves (ensuring the strength of the "source"). This significantly reduces the T / R value (the ratio of fresh weight of the above-ground parts to the underground parts), fundamentally creating physiological conditions for tuber enlargement and yield improvement.

[0040] 2. Nutrition and Metabolic Enhancement Layer: Phosphorus and potassium sources work synergistically with chelated trace elements to enhance the "storage" capacity and quality formation.

[0041] Potassium dihydrogen phosphate (PK phosphate) directly provides key macroelements during the tuber enlargement period. Phosphorus is a key component of ATP, an energy substance, and participates in photosynthetic phosphorylation and sugar transport; potassium regulates cell osmotic pressure, promotes the transport of carbohydrates to the tuber and starch synthesis, and directly expands the capacity and activity of the "sink".

[0042] Chelated trace elements (Zn, B, Fe): Zinc (Zn) is an essential cofactor for key enzymes in auxin (IAA) synthesis and sucrose synthase. Its dual role is to promote root cell division and enlargement ("sink building") on the one hand, and to directly catalyze sucrose synthesis and unloading ("high flow") on the other, making it a key element connecting the "source" and "sink." Boron (B) participates in the transmembrane transport of sugars across the cell membrane, ensuring the smooth flow of photosynthetic products to the root. Iron (Fe) is a core element in chlorophyll synthesis, ensuring the photosynthetic efficiency of the leaves ("source") and providing the material basis for high yields.

[0043] Synergistic effect: The synergistic effect of macro- and micro-elements not only meets the basic nutritional needs for tuber enlargement, but also enhances the generation, transport, and conversion and accumulation of photosynthetic products in tubers from a metabolic level (enzyme activity, substance transport). This is the key to improving quality indicators such as starch and soluble sugar.

[0044] 3. Physiological buffer and stress-resistance enhancement layer: dominated by alginate biostimulants, it relieves stress and enhances absorption.

[0045] Alginic acid and other biostimulants are rich in natural active substances and play a dual role as a "buffer" and "enhancer" in this system.

[0046] Relieving pesticide damage and abiotic stress: By increasing the activity of plant antioxidant enzymes (such as SOD and POD), it effectively removes excess reactive oxygen species generated by the use of growth regulators or environmental stress (such as drought), reduces the degree of membrane lipid peroxidation (manifested as a decrease in malondialdehyde content), thereby alleviating potential pesticide damage and enhancing the plant's tolerance to abiotic stress.

[0047] Promotes root development and absorption: Its natural plant hormone analogs can stimulate root development, expand the absorption area, and work synergistically with trace elements to promote nutrient absorption and utilization efficiency.

[0048] Synergistic effect: The presence of alginic acid ensures that when strong intervention (using growth inhibitors) is implemented in the "growth regulation layer", the physiological homeostasis and stress resistance of the plant are not weakened, but rather enhanced, providing a stable physiological guarantee for the achievement of high yield and quality goals.

[0049] 4. System enhancement and balance layer: Amino acid substances regulate endogenous balance and synergistic effect.

[0050] Amino acids (such as glycine) serve as small organic nitrogen sources and signaling molecules:

[0051] Regulating endogenous hormone balance: It can act as a precursor or regulator to participate in maintaining a new balance of endogenous hormones in plants after growth is controlled, avoiding excessive inhibition and maintaining necessary physiological activity.

[0052] Synergistic effect: It can act as a surfactant to improve the adhesion and penetration of the drug solution, promote the absorption and transport of other components (especially trace elements), and play a "carrying" and "synergistic" role.

[0053] Synergistic effect: Amino acids organically link the effects of the above-mentioned levels, further optimizing the overall efficacy of regulators, nutrients and biostimulants, and achieving the comprehensive goal of "controlling excessive growth without damaging roots, increasing yield without reducing quality, and resisting stress without premature aging".

[0054] In summary, the components in this invention are not simply superimposed, but rather constitute a four-dimensional synergistic system with "upper-level control and lower-level promotion (regulation layer)" as the core, "nutritional fortification (metabolic layer)" as the foundation, "stress-resistant buffer (protective layer)" as support, and "system synergy enhancement (balance layer)" as optimization. This system, targeting the physiological characteristics of fresh-eating sweet potatoes, systematically resolves the contradictions between vegetative and reproductive growth, high yield and quality, and artificial regulation and plant stress resistance, thereby producing unexpected synergistic effects far exceeding those of individual components or conventional combinations (e.g., in the examples, while significantly increasing yield, the T / R value decreased substantially, and quality and stress resistance indicators were simultaneously and significantly improved).

[0055] II. Comprehensive nutrition for improved quality and yield: By adding phosphorus and potassium sources (such as potassium dihydrogen phosphate) and trace elements (zinc, boron, iron), the demand for phosphorus and potassium elements for sweet potato tuber enlargement is met, and the trace elements participate in auxin synthesis, carbohydrate transport and chlorophyll synthesis, thus comprehensively improving the yield and quality of sweet potatoes.

[0056] III. Flexible application and low cost: The formula of this invention can be used for root dipping to promote early root development, or as a foliar spray to control excessive growth during the critical period of fruit enlargement. The application method is flexible. The cost per acre is less than 20 yuan, making it economical, practical, and easy to promote and apply on a large scale. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0058] The reagents used in the examples were sourced from:

[0059] Uniconazole (5% effective content), mepiquat chloride (98% effective content): Commercially available;

[0060] Potassium dihydrogen phosphate (food grade, purity ≥99%): commercially available;

[0061] Seaweed extract (alginic acid content ≥5%): commercially available (such as imported seaweed extract);

[0062] EDTA-Zn (containing 15% Zn), EDTA-Fe (containing 13% Fe), Borax (containing 11% B): Commercially available;

[0063] Glycine (food grade, purity ≥99%): commercially available.

[0064] The formulas described in this invention are all based on a dosage of 30 kg of water per acre for foliar spraying.

[0065] Example 1:

[0066] I. Basic Information of the Experiment

[0067] Trial period: June-October 2024

[0068] Experimental location: A sweet potato planting demonstration base in Shandong Province

[0069] Soil type: sandy loam, pH 6.8

[0070] Tested variety: Yanshu 25

[0071] Previous crop: corn

[0072] Base fertilizer application: All treatments were uniformly treated with 1500 kg / mu of well-rotted organic fertilizer and 30 kg / mu of compound fertilizer (15-15-15);

[0073] II. Formula Composition (based on 30 kg of water per acre)

[0074] Table 1 Raw material formulation for Example 1

[0075] III. Application Method

[0076] 1. Root dipping treatment (transplanting period: June 15th)

[0077] Operating hours: 8:00 AM - 10:00 AM (avoid high temperatures and strong light)

[0078] Seedling age: Potato seedlings are 25-30cm long and have 6-8 unfolded leaves.

[0079] Solution preparation: Take 50% of the total amount of the above formula (i.e., dilute with 15 kg of water) and stir thoroughly until completely dissolved.

[0080] Soaking method: Immerse the base of the potato seedlings (10-12cm from the root) in the solution for 15 minutes.

[0081] Precautions: Gently shake the potato seedlings during soaking to promote solution contact; transplant immediately after soaking to prevent the roots from drying out.

[0082] Transplanting density: 21cm between plants, 80cm between rows, approximately 4000 plants per acre.

[0083] 2. First foliar spray (root formation period: 70 days after planting, i.e., August 25th)

[0084] Field condition: Plants have closed the canopy, main vines are 80-100cm long, and tubers have begun to form.

[0085] Weather conditions: Sunny, temperature 25-32℃, no wind

[0086] Spraying time: After 4:00 PM (to avoid sunburn from the midday heat)

[0087] Application method: Use a backpack electric sprayer with a working pressure of 0.3-0.4 MPa.

[0088] Spraying areas: Focus on spraying the upper tender stems and leaves and the middle functional leaves, wetting both sides of the leaves but not dripping water.

[0089] Dosage: Apply 30 kg of pesticide solution evenly per acre.

[0090] 3. Second foliar spray (early stage of tuber enlargement: 100 days after planting, i.e., September 25th)

[0091] Field condition: The tubers are entering a period of rapid expansion, while the growth rate of the stems and vines is slowing down.

[0092] Weather conditions: Sunny, temperature 20-28℃, light breeze

[0093] Spraying time: 9:00-11:00 AM

[0094] Spraying method: Same as above, focusing on spraying the middle and upper leaves.

[0095] Precautions: Ensure there is no rainfall within 6 hours after spraying to allow for full absorption of the pesticide solution.

[0096] Example 2

[0097] Only the raw material formula was adjusted; the rest remained the same as in Example 1.

[0098] Table 2 Raw material formulation for Example 2

[0099]

[0100] Example 3

[0101] Only the raw material formula was adjusted; the rest remained the same as in Example 1.

[0102] Table 3 Raw material formulation for Example 3

[0103]

[0104] Example 4

[0105] Only the raw material formula was adjusted; the rest remained the same as in Example 1.

[0106] Table 4 Raw material formulation for Example 4

[0107]

[0108] Example 5

[0109] Only the raw material formula was adjusted; the rest remained the same as in Example 1.

[0110] Table 5 Raw material formulation for Example 5

[0111]

[0112] Example 6

[0113] The tested variety was adjusted to: Pushu 32, and the rest were the same as in Example 1.

[0114] Comparative Example 1 (without glycine)

[0115] Only the raw material formula was adjusted; the rest remained the same as in Example 1.

[0116] Table 6 Raw material formulation of Comparative Example 1

[0117]

[0118] Comparative Example 2: No seaweed extract added

[0119] Only the raw material formula was adjusted; the rest remained the same as in Example 1.

[0120] Table 7 Raw material formulation for Comparative Example 2

[0121]

[0122] Comparative Example 3: No trace elements added

[0123] Only the raw material formula was adjusted; the rest remained the same as in Example 1.

[0124] Table 8 Raw material formulation of Comparative Example 3

[0125]

[0126] Implementation Results Example

[0127] Experimental Design: The experiment was conducted at a fresh-eating sweet potato planting base in Shandong Province. The tested variety was Yanshu 25 (Pushu 32 was used in Example 6). The plot area was 20㎡, and the randomized block design was used with 3 replicates. Except for the fertilizer treatment, other field management measures were the same.

[0128] Blank control: Treatment content: In both root dipping and foliar spraying, the same amount of water was sprayed; all other aspects were the same as in all Examples 1.

[0129] Measurement indicators: T / R value, yield per mu, starch content, soluble sugar content, chlorophyll SPAD, proline content, malondialdehyde content.

[0130] T / R value: During the harvest period, 10 plants were randomly selected from each plot, and the fresh weight of the above-ground stems and leaves and the fresh weight of the underground tubers were weighed to calculate the T / R value (fresh weight of above-ground parts / fresh weight of underground parts).

[0131] Yield: Each plot is harvested separately and the yield is calculated per acre.

[0132] Quality indicators: Five tubers were randomly selected from each plot to determine the starch content (iodine colorimetric method) and soluble sugar content (anthrone colorimetric method).

[0133] Stress resistance indicators: Seven days after foliar spraying, the chlorophyll content (SPAD instrument), proline content (acidic ninhydrin method), and malondialdehyde content (thiobarbituric acid method) of the leaves were measured to evaluate the stress resistance of the plants.

[0134] Test results

[0135] Table 9 Effects of different treatments on sweet potato T / R value and yield

[0136]

[0137] *Note: The variety used in Example 6 is Pushu 32, whose blank control yield was 2150 kg / mu. Therefore, the yield increase rate is (2850-2150) / 2150×100%=32.6%.

[0138] Table 10 Effects of different treatments on sweet potato quality and stress resistance indicators

[0139]

[0140] Yanshu 25 is a low-starch variety, generally not exceeding 18%. Regulator treatment should increase yield and soluble sugar content (10%-18% soluble sugar), but its effect on starch content is unclear. Pushu 32 has an average dry matter content of 29.33%, a starch content of 18.89%, and a carotene content of 17.30 mg / 100g fresh tuber, with slightly higher dry matter and starch content than Yanshu 25.

[0141] Results Analysis

[0142] The T / R values ​​of Examples 1-5 were between 0.44 and 0.49, significantly lower than the blank control (0.85), indicating that the formulation of the present invention has a significant effect on controlling excessive growth and promotes the transfer of photosynthetic products to the underground parts. Example 3 (high dosage) had the lowest T / R value (0.44) and the best effect on controlling excessive growth. The T / R values ​​of Comparative Examples 1-3 (0.52-0.56) were higher than those of the Examples, indicating that the lack of glycine, seaweed extract and trace elements would affect the overall effect of controlling excessive growth.

[0143] Yield effect analysis: Example 1 yielded 3020 kg / mu, an increase of 40.5% compared to the control, showing significant effect; Example 3 (high dosage) yielded the highest (3050 kg / mu), but only increased by 1.0% compared to Example 1, indicating that both medium and high dosages can achieve ideal results; Example 2 (low dosage) still increased yield by 37.2%, proving that the lower limit of the claim is practical; Comparative Example 3 (deficient in trace elements) had the lowest yield increase rate (24.7%), indicating that trace elements are an indispensable component in the formula; Example 6 (Pushu 32) increased yield by 32.6%, proving that the present invention is applicable to different fresh-eating sweet potato varieties.

[0144] Quality effect analysis: Starch content: 23.5%-24.5% in Examples 1-5, significantly higher than the blank (18.5%) and the comparative example (22.0%-22.8%); Soluble sugar: 8.0%-8.4% in Examples 1-5, significantly higher than the blank (6.2%) and the comparative example (7.3%-7.6%); Example 3 had the highest starch (24.5%) and sugar (8.4%) content, indicating that appropriately increasing the dosage is beneficial to quality improvement.

[0145] Analysis of stress resistance effects: Proline content: 74.0-80.1 μg / g in Examples 1-5, significantly higher than the blank (45.2 μg / g) and comparative examples (62.1-68.3 μg / g), indicating that the formulation of this invention significantly enhances the plant's osmotic regulation capacity; Malondialdehyde content: 4.0-4.8 μmol / g in Examples 1-5, significantly lower than the blank (8.6 μmol / g) and comparative examples (5.5-6.2 μmol / g), indicating the lowest degree of membrane lipid peroxidation and minimal cell membrane damage; Comparative example 2 (lacking seaweed extract) showed worse stress resistance indicators than comparative example 1, indicating that seaweed extract plays an important role in enhancing stress resistance; Comparative example 1 (lacking glycine) showed better stress resistance indicators than comparative examples 2 and 3, indicating that glycine has a certain effect on alleviating phytotoxicity, but seaweed extract and trace elements contribute more to stress resistance.

[0146] Component importance analysis: Compared with Example 1, Comparative Example 1 showed a 6.9% decrease in yield, and both quality and stress resistance decreased, indicating that glycine has a synergistic and harm-reducing effect; Compared with Example 1, Comparative Example 2 showed an 8.9% decrease in yield and a significant decrease in stress resistance, indicating that seaweed extract is crucial for enhancing stress resistance; Compared with Example 1, Comparative Example 3 showed an 11.3% decrease in yield, and the most significant decrease in quality and stress resistance, indicating that trace elements are an indispensable basic component in the formulation.

[0147] The formulation of this invention exhibits excellent performance in controlling excessive growth, increasing yield, improving quality, and enhancing stress resistance. Example 1 is the preferred formulation, while Example 3, a high-dosage formulation, shows the best results, but the differences are not significant. The synergistic effect of each component is significant: the combination of uniconazole and mepiquat chloride achieves precise growth control; phosphorus and potassium sources meet the nutritional needs for tuber enlargement; trace elements (Zn, B, Fe) improve quality and stress resistance; seaweed extract enhances stress resistance and delays aging; and glycine enhances efficacy, reduces harm, and promotes absorption. The comparative example shows significantly inferior results compared to the examples, demonstrating the completeness and synergy of the formulation of this invention. The absence of any single component leads to a decrease in overall effectiveness, with trace element deficiency having the greatest impact, followed by seaweed extract, and then glycine. Furthermore, Example 6 verifies the applicability of this invention to different fresh-eating sweet potato varieties, proving its broad-spectrum application value.

[0148] The comparison of the above embodiments and comparative examples shows that the compound fertilizer formula for increasing yield of fresh sweet potatoes provided by this invention, through the combined use of uniconazole and mepiquat chloride, along with phosphorus and potassium sources, trace elements, biostimulants, and synergists, achieves comprehensive regulation of sweet potato growth. It exhibits significantly superior effects compared to existing technologies in controlling excessive vine growth, promoting tuber enlargement, improving yield and quality, and enhancing plant resistance. In particular, the addition of alginic acid and amino acids plays a crucial synergistic role in alleviating the damage caused by growth inhibitors and improving stress resistance.

Claims

1. A high-quality growth regulator fertilizer for fresh-eating sweet potatoes, characterized in that, It contains the following components: A plant growth regulator comprising uniconazole and mepiquat chloride; Nutrient fertilizer, wherein the nutrient fertilizer contains a phosphorus source and a potassium source; Biostimulants; and micronutrient fertilizers.

2. The regulator fertilizer according to claim 1, characterized in that, The biostimulant is selected from one or more of seaweed extract, humic acid, and chitin; preferably, the seaweed extract contains alginic acid or its derivatives.

3. The regulator fertilizer according to claim 1 or 2, characterized in that, The micronutrient fertilizer contains one or more of zinc, boron, and iron; preferably, the micronutrient fertilizer exists in a chelated form; more preferably, it contains EDTA-Zn, EDTA-Fe, and borax.

4. The regulator fertilizer according to any one of claims 1-3, characterized in that, Based on a foliar spray application rate of 30 kg of water per acre, the content of each component is as follows: Uniconazole 1.5 - 3.0 g; Mepiquat chloride 2.0 - 3.0 grams; 80-100 grams of phosphorus and potassium sources, calculated as potassium dihydrogen phosphate; Biostimulant 5-10 ml or g, based on the effective amount; 10-15 grams of micronutrient fertilizer.

5. The regulator fertilizer according to any one of claims 1-4, characterized in that, It also contains a synergist selected from one or more of amino acids, sodium nitrophenolate, amino acid esters, and brassinolide; preferably, the synergist includes amino acids or sodium nitrophenolate; more preferably, the amino acid includes glycine.

6. The regulator fertilizer according to any one of claims 1-5, characterized in that, The phosphorus and potassium sources are potassium dihydrogen phosphate.

7. A method for applying the regulator fertilizer according to any one of claims 1-6, characterized in that, This includes root dipping and / or foliar spraying.

8. The application method according to claim 7, characterized in that, The root-dipping treatment is carried out during sweet potato transplanting, in which the base of the sweet potato seedlings is immersed in a diluted fertilizer regulator solution; Preferably, the concentration of the diluted regulator fertilizer solution is 30%-70% of the concentration described in claim 4.

9. The application method according to claim 7 or 8, characterized in that, The foliar spraying is carried out during the tuber enlargement period of sweet potato; preferably, it is sprayed 1-3 times within 60-110 days after planting; more preferably, it is sprayed once every 7-10 days for 2-3 consecutive times.

10. The application of the regulator fertilizer according to any one of claims 1-6 or the application method according to any one of claims 7-9 in the cultivation of fresh-eating sweet potatoes, characterized in that, It is used to promote tuber enlargement, control excessive stem and vine growth, improve stress resistance and / or improve sweet potato quality.

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