A method for promoting growth of a ground cherry

Abstract

The present application belongs to the technical field of plant cultivation, and discloses a method for promoting the growth of Disperis chinensis. The technical problems of insufficient flower bud differentiation, less flowering, low fruit setting rate, poor fruit development and easy falling during the growth of Disperis chinensis are solved. The method comprises the following steps: applying leaf fertilizer and soil topdressing during the growth of Disperis chinensis. The leaf fertilizer comprises a basic general formula (formula 1+formula 2) and a strengthening and stabilizing fruit formula (formula 3), and the soil topdressing comprises a flower promoting fertilizer (formula 4) and a fruit setting and fruit strengthening fertilizer (formula 5). Through scientific proportioning of the components of each formula and synergistic effect, the present application can accurately match the nutrient requirements of Disperis chinensis during the flowering and fruiting period, regulate the growth rhythm of the plant, promote flower bud differentiation, improve the fruit setting rate, and enhance the fruit swelling capacity. The present application is suitable for flower promoting and fruit strengthening management in the artificial cultivation of Disperis chinensis, and is especially suitable for large-scale planting scenarios.

Description

Technical Field

[0001] This invention belongs to the field of plant cultivation technology, and in particular relates to a method for promoting the growth of *Melastoma dodecandrum*. Background Technology

[0002] Dimin( Melastoma dodecandrum Melastoma 'Lour.', also known as creeping shrub, is a creeping shrub belonging to the genus Melastoma in the family Melastomataceae. It is highly adaptable, drought-tolerant, and thrives in poor soil, often growing in acidic soils. It is commonly used for roadside slopes, areas prone to soil erosion, and understory greening. However, in artificial cultivation, especially for fruit harvesting or enhancing ornamental value, it often faces problems such as insufficient flower bud differentiation, low flowering, low fruit set, poor fruit development, and easy fruit drop, making it difficult to improve the yield and quality of Melastoma 'Lour.'

[0003] Currently, the artificial cultivation of *Melastoma dodecandrum* relies heavily on extensive management, lacking targeted techniques and specialized formulas for promoting flowering and fruit development. Existing formulas designed for other crops often fail to achieve the desired results when directly applied to *Melastoma dodecandrum* due to its different growth habits and nutritional requirements. This can lead to poor efficacy or fertilizer burn, hindering normal growth, flowering, and fruiting, and resulting in high rates of fruit deformities. For example, some flowering formulas contain excessive nitrogen, causing excessive vegetative growth and inhibiting flower bud differentiation; others lack essential elements, failing to meet the needs of fruit setting and enlargement, leading to low fruit set rates.

[0004] Furthermore, current research on fertilization in *Melastoma candida* cultivation techniques largely focuses on basic fertilization, with few specialized compound formulas targeting the critical flowering and fruiting stages. Moreover, the scientific ratios and precise dosages of each component are not clearly defined, making it difficult to simultaneously increase flowering quantity, fruit set rate, and fruit yield. Therefore, developing a method and corresponding formula that is suitable for the growth habits of *Melastoma candida*, has a scientific formula, precise dosage, and is easy to use to promote flowering and fruiting in *Melastoma candida* is crucial for promoting its large-scale cultivation.

[0005] In addition, current research on the growth of *Melastoma dodecandrum* focuses more on increasing fruit yield and pays less attention to improving the quality of *Melastoma dodecandrum* fruit (such as the sugar-acid ratio). Summary of the Invention

[0006] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a method for promoting the growth of *Melastoma candida*. This method combines the growth habits of *Melastoma candida* and its nutritional needs during the flowering and fruiting stages, precisely proportioning nutrients such as phosphorus, potassium, boron, calcium, and magnesium, as well as plant growth regulators. Foliar spraying and soil fertilization work synergistically to ensure the necessary nutrients for flower bud differentiation and flower development, while also meeting the needs for young fruit enlargement and quality improvement. This solves the problems of insufficient targeting and poor effectiveness of existing formulas. It is applicable to the management of flower and fruit promotion in the artificial cultivation of *Melastoma candida*, and is especially suitable for large-scale *Melastoma candida* planting scenarios.

[0007] The technical solution of the present invention is as follows: A method to promote the growth of *Melastoma dodecandrum* involves managing the plant to promote flowering and fruit development at different growth stages by applying foliar fertilizer and soil topdressing. The two work synergistically, providing comprehensive and precise nutritional support for flowering and fruiting through absorption via both leaves and roots.

[0008] The foliar fertilizer includes formula 1, formula 2 and formula 3, and the soil topdressing includes formula 4 and formula 5.

[0009] (1) During the flower bud differentiation period (after the spring shoots stop growing), spray Formula 1 at 10-20 L / mu. Formula 1 includes 2-4 g / L potassium dihydrogen phosphate, 1-3 mL / L fluid boron, and 0.05-0.1 mg / L brassinolide, as well as the remainder water.

[0010] (2) At the initial flowering stage (5-10% of flowers open), spray Formula 2 at 10-20 L / mu. Formula 2 includes 2-4 g / L potassium dihydrogen phosphate, 1-3 mL / L fluid boron, and 0.01-0.03 g / L sodium nitrophenolate, and the remainder is water.

[0011] In Formulas 1 and 2, potassium dihydrogen phosphate provides phosphorus and potassium. Phosphorus promotes flower bud differentiation and floral development, while potassium enhances plant resistance and reduces flower drop. Fluid boron promotes pollen germination and pollen tube elongation, increasing pollination success rate and reducing empty flowers. Brassinolide or sodium nitrophenolate acts as a plant growth regulator, regulating plant growth rhythm, promoting nutrient transport to floral organs, and improving flower bud quality.

[0012] (3) After flowering (≥70% of flowers have fallen) and during the fruit enlargement period, spray Formula 3 at 10-20 L / mu. Formula 3 includes 2-5 g / L potassium dihydrogen phosphate, 1-3 mL / L fluid boron, 1-3 g / L sugar alcohol calcium magnesium, 2-5 mL / L amino acid foliar fertilizer, and 0.05-0.1 mg / L brassinolide, with the remainder being water.

[0013] Formula 3 adds sugar alcohol calcium-magnesium and amino acid foliar fertilizer to Formula 1. Sugar alcohol calcium-magnesium provides calcium and magnesium. Calcium strengthens the cell walls of the fruit, reducing cracking and fruit drop, while magnesium promotes chlorophyll synthesis, ensuring photosynthesis and providing energy for fruit enlargement. Amino acid foliar fertilizer quickly replenishes organic nutrients, promoting fruit cell division and enlargement.

[0014] (4) Apply Formula 4 at 9-14 kg / mu 7-10 days before budding. Formula 4 includes 6.7-10 kg of superphosphate, 2-3.3 kg of potassium sulfate and 0.3-0.7 kg of borax.

[0015] Superphosphate provides long-lasting phosphorus, storing nutrients for flower bud differentiation. Potassium sulfate provides potassium, enhancing plant growth. Borax supplements boron, further promoting flower bud differentiation, improving flower bud fullness, and preventing deformed flowers.

[0016] (5) When the young fruit is 2-6 mm after flowering, apply formula 5 at 6-8.5 kg / mu. Formula 5 includes 0.5-1 kg potassium dihydrogen phosphate and 5.5-7.5 kg potassium sulfate.

[0017] Among them, potassium dihydrogen phosphate quickly replenishes phosphorus and potassium, promoting the enlargement of young fruits. Potassium sulfate provides long-lasting potassium, enhancing fruit quality, reducing fruit drop, and improving plant resistance to pests, diseases, and adverse environmental conditions.

[0018] Preferably, the formulas 1, 2, 3, 4 and 5 are applied 1 to 2 times.

[0019] More preferably, formulations 1, 2, 4 and 5 are applied once; formulation 3 is applied once after flowering; and formulation 3 is applied twice during the fruit enlargement period, with an interval of 10 to 14 days between the two applications.

[0020] Preferably, the application method of the formula 4 includes: digging a shallow trench (5-8 cm deep) 8-12 cm away from the roots of the Melastoma candida, evenly spreading the formula 4 into the trench, covering it with soil and watering it to ensure that the fertilizer dissolves and is absorbed, and to avoid direct contact between the fertilizer and the roots, which could cause root burn.

[0021] Preferably, the application method of the formula 5 includes: dissolving potassium dihydrogen phosphate in water and spraying it around the roots, and evenly spreading potassium sulfate around the roots and then watering to promote rapid fertilizer penetration and meet the needs of young fruit enlargement.

[0022] Preferably, the planting density of the *Rhodiola rosea* is 8,000 to 12,000 plants per mu, and more preferably 10,000 to 11,000 plants per mu.

[0023] Preferably, the fluid boron has a boron content ≥100 g / L, the sugar alcohol calcium magnesium has a calcium content ≥120 g / L and a magnesium content ≥30 g / L, the amino acid foliar fertilizer has an amino acid content ≥100 g / L, the potassium dihydrogen phosphate has a purity ≥98%, the potassium sulfate has a purity ≥95%, and the borax has a purity ≥99%.

[0024] Preferably, formulations 1 and 3 further include 0.25~0.6 g / L of fructose diphosphate sodium.

[0025] More preferably, the formulation 3 further includes 0.05~0.2 g / L hyaluronic acid.

[0026] The present invention also provides a fertilizer to promote the growth of *Melastoma dodecandrum*, including the foliar fertilizer and soil top dressing.

[0027] The present invention also provides the application of the fertilizer in promoting the growth of *Melastoma candida*.

[0028] When foliar spraying, avoid high temperatures (above 30℃) and choose cloudy days or evenings. Spray evenly to cover both sides of the leaves, as well as the surface of flowers and young fruits, to ensure full nutrient absorption. If using brassinolide, dissolve it in a small amount of warm water first, then add it to the diluted potassium dihydrogen phosphate, liquid boron, and other components, stir well, and spray to avoid excessive local concentrations that could cause phytotoxicity.

[0029] Compared with the prior art, the present invention has the following advantages: 1. Scientifically formulated and highly targeted: This invention combines the growth habits of Melilotus arvense and its nutritional needs during the flowering and fruiting period, precisely proportioning nutrients such as phosphorus, potassium, boron, calcium, and magnesium, as well as plant growth regulators. The synergistic effect of foliar spraying and soil fertilization ensures the nutrition required for flower bud differentiation and flower development, while also meeting the needs for young fruit enlargement and quality improvement, thus solving the problems of insufficient targeting and poor effect of existing formulas.

[0030] 2. Significant effect on promoting flowering and fruit development: The basic general formula of foliar fertilizer (formula 1 + formula 2) promotes flower bud differentiation and improves pollination success rate. The formula for strengthening fruit stability (formula 3) reduces fruit drop and promotes fruit enlargement. The bud-promoting fertilizer (formula 4) and fruit-setting and fruit-strengthening fertilizer (formula 5) in the soil supplement long-lasting nutrition. Overall, it can effectively improve the flowering amount, fruit setting rate and fruit yield of the plant.

[0031] 3. Convenient to use and low cost: The raw materials used in the formula of this invention are all conventional agricultural fertilizers and plant growth regulators, which are readily available and inexpensive; the application method is simple and does not require complicated equipment. Foliar spraying and soil topdressing can be completed through conventional agricultural operations, making it suitable for large-scale planting and small-scale cultivation, and easy to promote and apply.

[0032] 4. Safe and environmentally friendly, with no side effects: The ingredients of this invention all meet agricultural production standards, and the concentration is scientifically controlled, avoiding fertilizer damage and environmental pollution caused by excessive fertilization. It has no side effects on the soil and the *Melastoma candida* plant, and at the same time, it can reduce pesticide and fertilizer residues, and improve the safety and quality of *Melastoma candida* fruit.

[0033] 5. The foliar fertilizer formulas 1 and 3 of this invention also include sodium fructose diphosphate. Spraying them during the flower bud differentiation period, after flowering, and during the young fruit enlargement period can effectively promote the absorption of various nutrients by the melon, increase the weight of the melon fruit, and reduce the deformity rate of the melon fruit (mainly to improve the fruit cracking situation).

[0034] Furthermore, hyaluronic acid is added to Formula 3. As an acidic mucopolysaccharide, it can not only further promote the nutrient absorption of acid-loving Rhododendron simsii, but also, when used in combination with fructose diphosphate sodium, can further improve the quality (sugar-acid ratio) of Rhododendron simsii fruit. Attached Figure Description

[0035] Figure 1 This is a diagram showing the growth of *Rhododendron molle* in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of a normal *Melastoma dodecandrum* fruit obtained in Example 3 of the present invention; Figure 3 This is a schematic diagram showing the fruit cracking of *Melastoma candida* fruit in the CK group of this invention. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Unless otherwise specified in the following examples, the cultivation method of *Rhodiola rosea* is a conventional artificial cultivation method, and the implementation conditions are usually those in conventional experiments. The raw materials are all commercially available or prepared by conventional methods in the field.

[0038] Among them, potassium dihydrogen phosphate has a purity of ≥98%, fluid boron has a boron content of ≥100 g / L, brassinolide and sodium nitrophenolate are conventional commercial products, sugar alcohol calcium magnesium (calcium ≥120 g / L, magnesium ≥30 g / L), amino acid foliar fertilizer (amino acid ≥100 g / L), superphosphate, potassium sulfate and borax are all conventional agricultural grade products. Example 1

[0039] This embodiment provides a method to promote the growth of *Rhodiola rosea*. The *Rhodiola rosea* is cultivated using conventional artificial cultivation methods. At different growth stages, additional management measures are implemented to promote flowering and fruit development, including the application of foliar fertilizer and soil topdressing. These two methods work synergistically, providing comprehensive and precise nutritional support for flowering and fruiting through both foliar and root absorption pathways.

[0040] 1. Foliar fertilizer formulation and application (1) During the flower bud differentiation period (after the spring shoots stop growing), spray Formula 1 at 15 L / mu. Formula 1 includes 2.6 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron and 0.07 mg / L brassinolide. After mixing each component with water, spray once in the evening to evenly cover the front and back of the leaves.

[0041] (2) At the initial flowering stage (5-10% of flowers open), spray Formula 2 at 15 L / mu. Formula 2 includes 2.6 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron and 0.012 g / L sodium nitrophenolate. After mixing each component with water evenly, spray once in the evening to evenly cover the front and back of the leaves.

[0042] (3) After flowering (≥70% of flowers have fallen), spray Formula 3 at 15 L / mu. Formula 3 includes 3.3 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 2 g / L sugar alcohol calcium magnesium, 3.3 mL / L amino acid foliar fertilizer, and 0.07 mg / L brassinolide. Mix all components with water until homogeneous, and spray once in the evening, evenly covering both sides of the leaves.

[0043] (4) During the fruit enlargement period, spray Formula 3 at 15 L / mu in the evening, evenly covering the front and back of the leaves. Spray twice in total, with an interval of 10 to 14 days between the two applications.

[0044] 2. Soil topdressing and application (5) Apply Formula 4 at 11.5 kg / mu 7-10 days before budding. Formula 4 includes 8 kg of superphosphate, 3 kg of potassium sulfate and 0.5 kg of borax.

[0045] The application method for Formula 4 includes: digging a shallow trench (5-8 cm deep) 10 cm away from the roots of the Melastoma cane, spreading Formula 4 evenly into the trench, covering it with soil and watering it to ensure that the fertilizer is dissolved and absorbed, and to avoid direct contact between the fertilizer and the roots, which could cause root burn.

[0046] (6) When the young fruit is 2-6 mm after flowering, apply Formula 5 at 7.3 kg / mu. Formula 5 includes 0.8 kg potassium dihydrogen phosphate and 6.5 kg potassium sulfate.

[0047] The application method of Formula 5 includes: dissolving potassium dihydrogen phosphate in water and spraying it around the roots, then evenly spreading potassium sulfate around the roots and watering to promote rapid fertilizer penetration and meet the needs of young fruit enlargement. Example 2

[0048] Based on Example 1, this example provides a method for promoting the growth of *Melastoma dodecandrum*. Formulas 1 and 3 also include 0.4 g / L sodium fructose diphosphate.

[0049] At this point, Formula 1 specifically includes: 2.6 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 0.07 mg / L brassinolide, and 0.4 g / L fructose diphosphate sodium.

[0050] Formula 3 specifically includes: 3.3 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 2 g / L sugar alcohol calcium magnesium, 3.3 mL / L amino acid foliar fertilizer, 0.07 mg / L brassinolide, and 0.4 g / L fructose diphosphate sodium. Example 3

[0051] Based on Example 1, this example provides a method for promoting the growth of *Melastoma dodecandrum*. Formula 1 further includes 0.4 g / L sodium fructose diphosphate, and Formula 3 further includes 0.4 g / L sodium fructose diphosphate and 0.1 g / L hyaluronic acid.

[0052] At this point, Formula 1 specifically includes: 2.6 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 0.07 mg / L brassinolide, and 0.4 g / L fructose diphosphate sodium.

[0053] Formula 3 specifically includes: 3.3 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 2 g / L sugar alcohol calcium magnesium, 3.3 mL / L amino acid foliar fertilizer, 0.07 mg / L brassinolide, 0.4 g / L fructose diphosphate sodium, and 0.1 g / L hyaluronic acid. Example 4

[0054] This embodiment provides a method to promote the growth of *Rhodiola rosea*. The *Rhodiola rosea* is cultivated using conventional artificial cultivation methods. At different growth stages, additional management measures are implemented to promote flowering and fruit development, including the application of foliar fertilizer and soil topdressing. These two methods work synergistically, providing comprehensive and precise nutritional support for flowering and fruiting through both foliar and root absorption pathways.

[0055] 1. Foliar fertilizer formulation and application (1) During the flower bud differentiation period (after the spring shoots stop growing), spray Formula 1 at 10 L / mu. Formula 1 includes 4 g / L potassium dihydrogen phosphate, 3 mL / L fluid boron, 0.1 mg / L brassinolide and 0.6 g / L fructose diphosphate sodium. After mixing each component with water evenly, spray once in the evening to evenly cover the front and back of the leaves.

[0056] (2) At the initial flowering stage (5-10% of flowers open), spray Formula 2 at 10 L / mu. Formula 2 includes 4 g / L potassium dihydrogen phosphate, 3 mL / L fluid boron and 0.03 g / L sodium nitrophenolate. After mixing each component with water evenly, spray once in the evening to evenly cover the front and back of the leaves.

[0057] (3) After flowering (≥70% of flowers have fallen), spray Formula 3 at 10 L / mu. Formula 3 includes 5 g / L potassium dihydrogen phosphate, 3 mL / L fluid boron, 3 g / L sugar alcohol calcium magnesium, 5 mL / L amino acid foliar fertilizer, 0.1 mg / L brassinolide, 0.6 g / L fructose diphosphate sodium, and 0.2 g / L hyaluronic acid. Mix all components with water until homogeneous, and spray once in the evening, evenly covering both sides of the leaves.

[0058] (4) During the fruit enlargement period, spray formula 3 at 10 L / mu, spray once in the evening, and evenly cover the front and back of the leaves.

[0059] 2. Soil topdressing and application (5) Apply Formula 4 at 9 kg / mu 7-10 days before budding. Formula 4 includes 6.7 kg superphosphate, 2 kg potassium sulfate and 0.3 kg borax.

[0060] The application method for Formula 4 includes: digging a shallow trench (5-8 cm deep) 10 cm away from the roots of the Melastoma cane, spreading Formula 4 evenly into the trench, covering it with soil and watering it to ensure that the fertilizer is dissolved and absorbed, and to avoid direct contact between the fertilizer and the roots, which could cause root burn.

[0061] (6) When the young fruit is 2-6 mm after flowering, apply Formula 5 at 6 kg / mu. Formula 5 includes 0.5 kg potassium dihydrogen phosphate and 5.5 kg potassium sulfate.

[0062] The application method of Formula 5 includes: dissolving potassium dihydrogen phosphate in water and spraying it around the roots, then evenly spreading potassium sulfate around the roots and watering to promote rapid fertilizer penetration and meet the needs of young fruit enlargement. Example 5

[0063] This embodiment provides a method to promote the growth of *Rhodiola rosea*. The *Rhodiola rosea* is cultivated using conventional artificial cultivation methods. At different growth stages, additional management measures are implemented to promote flowering and fruit development, including the application of foliar fertilizer and soil topdressing. These two methods work synergistically, providing comprehensive and precise nutritional support for flowering and fruiting through both foliar and root absorption pathways.

[0064] 1. Foliar fertilizer formulation and application (1) During the flower bud differentiation period (after the spring shoots stop growing), spray Formula 1 at 20 L / mu. Formula 1 includes 2 g / L potassium dihydrogen phosphate, 1 mL / L fluid boron, 0.05 mg / L brassinolide and 0.25 g / L fructose diphosphate sodium. After mixing each component with water, spray once in the evening to evenly cover the front and back of the leaves.

[0065] (2) At the initial flowering stage (5-10% of flowers open), spray Formula 2 at 20 L / mu. Formula 2 includes 2 g / L potassium dihydrogen phosphate, 1 mL / L fluid boron and 0.01 g / L sodium nitrophenolate. After mixing each component with water evenly, spray once in the evening to evenly cover the front and back of the leaves.

[0066] (3) After flowering (≥70% of flowers have fallen), spray Formula 3 at 20 L / mu. Formula 3 includes 2 g / L potassium dihydrogen phosphate, 1 mL / L fluid boron, 1 g / L sugar alcohol calcium magnesium, 2 mL / L amino acid foliar fertilizer, 0.05 mg / L brassinolide, 0.25 g / L fructose diphosphate sodium, and 0.05 g / L hyaluronic acid. After mixing all components with water, spray once in the evening, evenly covering both sides of the leaves.

[0067] (4) During the fruit enlargement period, spray formula 3 at 20 L / mu, spray once in the evening, and evenly cover the front and back of the leaves.

[0068] 2. Soil topdressing and application (5) Apply Formula 4 at 14 kg / mu 7-10 days before budding. Formula 4 includes 10 kg of superphosphate, 3.3 kg of potassium sulfate and 0.7 kg of borax.

[0069] The application method for Formula 4 includes: digging a shallow trench (5-8 cm deep) 10 cm away from the roots of the Melastoma cane, spreading Formula 4 evenly into the trench, covering it with soil and watering it to ensure that the fertilizer is dissolved and absorbed, and to avoid direct contact between the fertilizer and the roots, which could cause root burn.

[0070] (6) When the young fruit is 2-6 mm after flowering, apply Formula 5 at 8.5 kg / mu. Formula 5 includes 1 kg of potassium dihydrogen phosphate and 7.5 kg of potassium sulfate.

[0071] The application method of Formula 5 includes: dissolving potassium dihydrogen phosphate in water and spraying it around the roots, then evenly spreading potassium sulfate around the roots and watering to promote rapid fertilizer penetration and meet the needs of young fruit enlargement.

[0072] field trials The *Rhodiola rosea* was cultivated in Nanchang County, Nanchang City, Jiangxi Province, on a scale of 1 mu (approximately 0.16 acres) with a planting density of 10,000 plants.

[0073] I. Effects of foliar fertilizer on the growth of *Melastoma candida* in Example 1 of this invention In the initial study of this invention, the effects of different foliar fertilizer formulations in Example 1 on the growth of *Melastoma candida* were set up, including a control group (CK, foliar spray with an equal amount of water), foliar fertilizer group 1 (single application of formulation 1), foliar fertilizer group 2 (single application of formulation 2), foliar fertilizer group 3 (single application of formulation 3), and foliar fertilizer group 4 (spraying with formulation 1 + formulation 2 + formulation 3). None of the groups included soil topdressing as in Example 1, and the rest were the same as in Example 1.

[0074] The number of flowers was counted from the time the plants began to flower in May until the end of flowering. Mature fruits were harvested in batches starting in July (based on the fruit turning purplish-black). The fruit set rate and fresh fruit yield of the harvested fruits were then recorded.

[0075] The results are shown in Table 1 below. Compared with the CK group and the application of formula 1, formula 2 and formula 3 alone, the combination of formula 1, formula 2 and formula 3 for foliar spraying can effectively increase the flowering amount, fruit setting rate and fresh fruit yield of Melastoma dodecandrum, and promote the flowering and fruiting of Melastoma dodecandrum. Therefore, formula 1, formula 2 and formula 3 were selected for foliar spraying.

[0076] Table 1

[0077] II. The effect of soil topdressing on the growth of *Melastoma candida* in Example 1 of this invention In the initial study of this invention, the effects of different soil fertilization formulas in Example 1 on the growth of *Melastoma dodecandrum* were set up, including a blank group (CK, no fertilization) and soil fertilization groups 1 (single application of formula 4), 2 (single application of formula 5), ​​and 3 (application of formula 4 + formula 5). None of the groups included foliar fertilizer spraying as in Example 1, and the rest were the same as in Example 1.

[0078] The results are shown in Table 2 below. Compared with the CK group and the application of formula 4 and formula 5 alone, the combination of formula 4 and formula 5 as topdressing can effectively increase the flowering amount, fruit setting rate and fresh fruit yield of *Melastoma candida*, and promote flowering and fruiting of *Melastoma candida*. Therefore, formula 4 and formula 5 were selected for topdressing.

[0079] Table 2

[0080] III. The effects of the foliar fertilizer + soil topdressing of this invention on the growth of *Melastoma candida* The *Melastoma candida* was managed to promote flowering and fruit development according to the methods described in Examples 1 to 5 of this invention, with foliar fertilizer and soil topdressing applied. A control group (CK) was set up, with an equal amount of water sprayed on the leaves and no topdressing. Observation showed that the growth of *Melastoma candida* in each group was normal (taking Example 1 as an example). Figure 1 The results of each growth index are shown in Table 3 below.

[0081] The results showed that the number of flowers per plant in Examples 1 to 5 ranged from 30.3 to 35.7, the fruit set rate from 86.8% to 92.5%, and the fresh fruit yield from 32.9 to 44.1 g per plant. The number of flowers, fruit set rate, and fresh fruit yield increased sequentially in Examples 1, 2, and 3, indicating that the addition of sodium fructose diphosphate and hyaluronic acid promoted the growth of *Melastoma candida*.

[0082] Table 3

[0083] IV. Effects of sodium fructose diphosphate and hyaluronic acid in the foliar fertilizer of this invention on the growth of *Melastoma candida*. To further investigate the effects of sodium fructose diphosphate and hyaluronic acid on the growth of *Melastoma candida*, comparative examples 1 to 8 were set up, and a control group (CK, foliar sprayed with an equal amount of water, no topdressing) was set up.

[0084] Comparative Example 1 The difference between this comparative example and Example 2 is that Formula 1 and Formula 3 do not include 0.4 g / L fructose diphosphate sodium, while Formula 2 also includes 0.4 g / L fructose diphosphate sodium. In this case, Formula 2 specifically includes: 2.6 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 0.012 g / L sodium nitrophenolate and 0.4 g / L fructose diphosphate sodium.

[0085] Comparative Example 2 The difference between this comparative example and Example 3 is that Formula 1 does not include 0.4 g / L fructose diphosphate sodium. In this case, Formula 1 specifically includes: 2.6 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, and 0.07 mg / L brassinolide.

[0086] Comparative Example 3 The difference between this comparative example and Example 3 is that Formula 3 does not include 0.4 g / L fructose diphosphate sodium. Formula 3 specifically includes: 3.3 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 2 g / L sugar alcohol calcium magnesium, 3.3 mL / L amino acid foliar fertilizer, 0.07 mg / L brassinolide, and 0.1 g / L hyaluronic acid.

[0087] Comparative Example 4 The difference between this comparative example and Example 3 is that Formula 1 further includes 0.4 g / L fructose diphosphate sodium and 0.1 g / L hyaluronic acid, while Formula 3 further includes 0.4 g / L fructose diphosphate sodium.

[0088] At this point, Formula 1 specifically includes: 2.6 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 0.07 mg / L brassinolide, 0.4 g / L fructose diphosphate sodium, and 0.1 g / L hyaluronic acid.

[0089] Formula 3 specifically includes: 3.3 g / L potassium dihydrogen phosphate, 1.3 mL / L fluid boron, 2 g / L sugar alcohol calcium magnesium, 3.3 mL / L amino acid foliar fertilizer, 0.07 mg / L brassinolide, and 0.4 g / L fructose diphosphate sodium.

[0090] Comparative Example 5 The difference between this comparative example and Example 3 is that fructose diphosphate sodium is replaced with glucose.

[0091] Comparative Example 6 The difference between this comparative example and Example 3 is that fructose diphosphate sodium is replaced with fructose.

[0092] Comparative Example 7 The difference between this comparative example and Example 3 is that hyaluronic acid is replaced with citric acid.

[0093] Comparative Example 8 The difference between this comparative example and Example 3 is that hyaluronic acid is replaced with alginate.

[0094] 1. Impact on production The yield of fresh fruit in each group was statistically analyzed, and the results are shown in Table 4 below. The results show that compared with Example 2, the yield of Comparative Example 1 was significantly reduced, and compared with Example 3, the yields of Comparative Examples 2 to 8 were reduced to varying degrees, indicating that the application time and composition of fructose diphosphate sodium have a significant impact.

[0095] Table 4

[0096] 2. Effects of fruit deformity rate on *Melastoma candida* When the fruit of the *Melastoma dodecandrum* was harvested, its appearance was observed, and it was found that most of the fruits in each group had a normal appearance (see Example 3). Figure 2 Only some groups experienced fruit cracking (see CK group for example). Figure 3 The fruit cracking situation in the CK group, Examples 1-3, and Comparative Examples 5-6 was statistically analyzed. The deformity rate of *Melastoma candida* fruit was calculated as 100% × (number of cracked fruits / total number of fruits included in the survey), as shown in Table 5 below. The results show that the application of sodium fructose diphosphate can regulate the growth of *Melastoma candida* fruit, effectively reduce the deformity rate, and improve fruit quality.

[0097] Table 5

[0098] 3. Effect of fructose-acid ratio on *Melastoma candida* The sugar-acid ratio of *Melastoma candida* fruit obtained from the CK group, Example 2, Example 3, and Comparative Examples 5-8 was measured respectively, and the results are shown in Table 6 below. The results show that, compared with Example 2, the combined application of fructose diphosphate sodium and hyaluronic acid can further regulate the substance production of *Melastoma candida* fruit and improve its quality (sugar-acid ratio).

[0099] Table 6

[0100] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for promoting the growth of *Rhododendron simsii*, characterized in that: To promote flowering and fruit development in *Melastoma dodecandrum*, foliar fertilizer is applied, including formulas 1, 2, and 3. During the flower bud differentiation period, spray Formula 1 at 10-20 L / mu, which includes 2-4 g / L potassium dihydrogen phosphate, 1-3 mL / L fluid boron and 0.05-0.1 mg / L brassinolide. At the initial flowering stage, spray Formula 2 at 10-20 L / mu, which includes 2-4 g / L potassium dihydrogen phosphate, 1-3 mL / L fluid boron and 0.01-0.03 g / L sodium nitrophenolate; After flowering and during the fruit enlargement period, spray Formula 3 at 10-20 L / mu. Formula 3 includes 2-5 g / L potassium dihydrogen phosphate, 1-3 mL / L fluid boron, 1-3 g / L sugar alcohol calcium magnesium, 2-5 mL / L amino acid foliar fertilizer, and 0.05-0.1 mg / L brassinolide.

2. The method according to claim 1, characterized in that: It also includes the application of soil topdressing, which includes formulations 4 and 5; Apply Formula 4 at a rate of 9-14 kg / mu 7-10 days before budding. Formula 4 includes 6.7-10 kg of superphosphate, 2-3.3 kg of potassium sulfate, and 0.3-0.7 kg of borax. When the young fruit is 2-6 mm after flowering, apply Formula 5 at a rate of 6-8.5 kg / mu. Formula 5 includes 0.5-1 kg of potassium dihydrogen phosphate and 5.5-7.5 kg of potassium sulfate.

3. The method according to claim 1, characterized in that: The planting density of the *Rhodiola rosea* is 8,000 to 12,000 plants per mu.

4. The method according to claim 1, characterized in that: Formulas 1 and 3 also include 0.25~0.6 g / L fructose diphosphate sodium.

5. The method according to claim 2, characterized in that: Formulas 1, 2, 3, 4 and 5 are to be applied 1 to 2 times.

6. The method according to claim 2, characterized in that: The application method of Formula 4 includes: digging a trench 8-12 cm away from the roots of Melastoma dodecandrum, spreading Formula 4 evenly into the trench, covering it with soil, and then watering it. The application method of the formula 5 includes: spraying potassium dihydrogen phosphate diluted with water, and watering after sprinkling potassium sulfate.

7. The method according to claim 2, characterized in that: The fluid boron has a boron content ≥100 g / L, the sugar alcohol calcium magnesium has a calcium content ≥120 g / L and a magnesium content ≥30 g / L, the amino acid foliar fertilizer has an amino acid content ≥100 g / L, the potassium dihydrogen phosphate has a purity ≥98%, the potassium sulfate has a purity ≥95%, and the borax has a purity ≥99%.

8. The method according to claim 4, characterized in that: Formula 3 also includes 0.05~0.2 g / L hyaluronic acid.

9. A fertilizer for promoting the growth of *Sedum aizoon*, characterized in that: This includes the foliar fertilizer described in claim 1 and / or the soil topdressing described in claim 2.

10. The application of the fertilizer of claim 9 in promoting the growth of *Melastoma dodecandrum*.

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