Method for regulating flowering of cinnamomum camphora and application thereof

Abstract

The application discloses a method for regulating flowering period of Lagerstroemia indica and application thereof, and comprises the following steps: S1, daily management of Lagerstroemia indica; S2, operation of regulating flowering period of Lagerstroemia indica; S3, maintenance of Lagerstroemia indica after regulating flowering period; wherein, the step S2 comprises: S21, selecting suitable plants, S22, pruning inflorescences or pruning branches of the plants in the middle and late May to the late August according to the target of regulating flowering period. The method for regulating flowering period of Lagerstroemia indica provided by the application regulates the secondary flowering period of Lagerstroemia indica to the period from September to the middle and early October, enriches the types of woody flower viewing plants in the period of major festivals (such as the National Day), reduces the amount of grass flowers, guarantees the flower landscape effect, and reduces the maintenance cost. The method for regulating flowering period of Lagerstroemia indica provided by the application is high in accuracy, strong in practicability and convenient to popularize.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plant cultivation, more particularly to a method for regulating the flowering period of Lagerstroemia indica and application thereof. BACKGROUND

[0002] There are fewer types of flowering woody plants in East China and Central China in summer and autumn, and the flower landscape guarantee for major festivals (such as the National Day) mainly relies on grass flowers. The use of a large number of grass flowers has the following disadvantages: 1. High economic cost, the cost of flower production, transportation, planting, maintenance and replacement is high every 4-6 times of flower replacement; 2. Unable to maintain normal long-term, seasonal grass flowers need to be replaced frequently, and the ornamental period of a kind of grass flower is about 1-3 months, and the growth period is less than one year; 3. Low ecological benefit, first, a large amount of water, fertilizer and pesticide is needed in the process of planting and maintenance, second, the biomass is much smaller than that of woody plants, and the carbon fixation capacity is significantly weaker than that of woody plants, and third, the soil fixation effect is weak.

[0003] Therefore, one of the research directions of those skilled in the art is to regulate the flowering period of woody plants. Lagerstroemia indica belongs to the family Lythraceae and has large flower quantity, rich flower color and long flowering period, and is an important summer flowering plant. Lagerstroemia indica can effectively prolong the flowering period or regulate the flowering period through pruning and other measures due to the characteristic of flowering in the same year as flower bud differentiation. In recent years, certain achievements have been made in the research on the related technology for regulating the flowering period of Lagerstroemia indica. Sha Fei, Lu Shibao and Chen Ying et al. made Lagerstroemia indica bloom for 2-3 rounds through partial branch pruning or step-by-step pruning (also known as round-by-round pruning), but the flower quantity of Lagerstroemia indica treated by partial pruning or step-by-step pruning was significantly reduced during the peak flowering period. In addition, Luo Xuemeng and Dai Qingmin et al. also studied the effect of exogenous hormones on the secondary flowering of Lagerstroemia indica.

[0004] However, in the existing research, even if the same or similar operation technology is used, the regulation effect is greatly different due to the differences in regions, varieties and operators. The applicant once conducted pruning at the end of July and the beginning of August on the basis of these researches in order to regulate the secondary peak flowering period of Lagerstroemia indica in the Shanghai area to the National Day period, but the ideal effect could not be achieved, and the regulation effects of different varieties were greatly different.

[0005] In view of the above problems, the applicant is committed to developing a popular Lagerstroemia indica flowering period regulation measure to regulate the secondary peak flowering period of Lagerstroemia indica to September to the middle and early October, so as to enrich the types of woody flowering plants in major festivals (such as the National Day), reduce the use of grass flowers, guarantee the flower landscape effect, and reduce the maintenance cost. SUMMARY

[0006] In view of the shortcomings of the above prior art, the purpose of the present application is to provide a method for regulating the flowering period of Lagerstroemia indica and application thereof, which can solve the problem that the existing flower period regulation method cannot achieve the ideal effect.

[0007] To achieve the above object, the application provides a method for regulating flowering period of Lagerstroemia indica, comprising:

[0008] S1, daily management of Lagerstroemia indica is performed;

[0009] S2, flowering period regulation operation is performed on Lagerstroemia indica;

[0010] S3, maintenance is performed on Lagerstroemia indica after the flowering period regulation;

[0011] In the step S2, the following steps are included:

[0012] S21, suitable plants are selected;

[0013] S22, according to the flowering period regulation target, inflorescence pruning or branch pruning is performed on the plants from the middle or late May to the late August.

[0014] Preferably, in the step S2, the pruning time and the pruning amount satisfy the following formula:

[0015] D t =1.931D p +28.734A p +8.1;

[0016] In the formula, D t is the number of days from August 1 to the target beginning of full flowering period, D p is the number of days from August 1 to the pruning time, and A p is the proportion of pruning of the current year branches (excluding inflorescences).

[0017] D t , D p and A p satisfy the following restrictions:

[0018] D t and D p are integers, D t > 25, D p ≤ 22, 8.1 + 1.931D p ≤ D t < 20.634 + 1.931D p .

[0019] 0 ≤ A p < 1, and when A p = 0, the inflorescence is pruned.

[0020] Preferably, when A p = 0, the first full axillary bud below the inflorescence is pruned; and when A p ≥ 0.8, the pruned branch has at least 3 axillary buds.

[0021] Preferably, the flowering period of the second flowering of Lagerstroemia indica is regulated to September to the middle of October through the method for regulating the flowering period of Lagerstroemia indica.

[0022] Preferably, in step S21, the selected plant should meet the following conditions: no vertical obstruction of the crown, healthy growth, and no obvious diseases and pests.

[0023] Preferably, step S1 comprises:

[0024] S11, focusing on the prevention and control of Lagerstroemia indica pear weevils, powdery mildew, and Lagerstroemia indica long-spotted aphids, wherein,

[0025] The prevention and control method for Lagerstroemia indica pear weevils is: spraying pesticides for prevention after budding in spring; if pests have occurred, spraying pesticides once every 10-15 days, and continuously spraying pesticides for 2-3 times; cutting off all fruit sequences before the capsules crack in the middle of November of the previous year;

[0026] The prevention and control method for powdery mildew is: spraying pesticides for prevention after budding in spring; if diseases have occurred, spraying pesticides once every 7-10 days, and continuously spraying pesticides for 2-3 times;

[0027] The prevention and control method for Lagerstroemia indica long-spotted aphids is: spraying pesticides for prevention after budding in spring; if pests have occurred, spraying pesticides once every 10-15 days, and continuously spraying pesticides for 2-3 times.

[0028] Preferably, step S1 further comprises:

[0029] S12, applying organic fertilizer to Lagerstroemia indica in winter of the previous year, with a fertilizer application amount of 8-12 kg / m 2 , and a fertilization method of spreading and mixing the organic fertilizer with the surface soil by combining with soil loosening;

[0030] S13, soil moisture management: if the soil is not dry, do not water; if water is applied, water thoroughly;

[0031] S14, performing severe shortening on current-year branches in winter of the previous year, and removing dense branches, diseased and pest branches, thin and weak branches, senescent branches, and dead branches, wherein the severe shortening is to prune off 3 / 4-4 / 5 of the current-year growth of the branches.

[0032] Preferably, step S3 comprises:

[0033] S31, within 1-7 days after pruning, spraying insecticides and fungicides to prevent the occurrence of diseases and pests such as Lagerstroemia indica pear weevils, powdery mildew, and Lagerstroemia indica long-spotted aphids.

[0034] Preferably, step S3 further comprises:

[0035] S32, fertilization: after the flowering period regulation operation of Lagerstroemia indica, a compound fertilizer of monoammonium phosphate is applied, and the fertilization mode adopts hole fertilization or ring fertilization, and the fertilization hole and the fertilization ring are at the vertical projection outer edge of the tree crown.

[0036] The application also provides an application of the Lagerstroemia indica flowering period regulation method in regulating the flowering period of Lagerstroemia indica.

[0037] The Lagerstroemia indica flowering period regulation method provided by the application has the following technical effects:

[0038] 1. The Lagerstroemia indica flowering period regulation method provided by the application regulates the secondary flowering peak flowering period of Lagerstroemia indica to September to the middle and late October, so as to enrich the types of woody flowering plants in major festival activities (such as the National Day), reduce the amount of grass flowers, ensure the flower landscape effect, and reduce the maintenance cost.

[0039] 2. The Lagerstroemia indica flowering period regulation method provided by the application has high accuracy, strong practicability and is convenient to popularize.

[0040] The concept, specific structure and technical effects of the application will be further described below with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the application. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is the 'Swan Velvet' state diagram of Example 1 in the application case of Putuo Xincun Road on September 27, 2020.

[0042] Figure 2 is the 'Swan Velvet' state diagram of Example 3 in the first scene of Jing'an Zhijiang Road on September 27, 2020.

[0043] Figure 3 is the 'Swan Velvet' state of Example 3 in the second scene of Jing'an Zhijiang Road on September 9, 2020.

[0044] Figure 4 is the 'Swan Velvet' state diagram of Example 3 in the third scene of Putuo Xincun Road on September 10, 2020.

[0045] Figure 5 is the WT-01 state diagram of Example 3 in the fourth scene of Huangpu District, The Bund on September 15, 2020.

[0046] Figure 6 is the 'Powder Crystal' state diagram of Example 3 in the fifth scene of Songjiang Sixin Road on September 23, 2022.

[0047] Figure 7 is the 'Swan Velvet' state diagram of Example 3 in the sixth scene of Pudong New Area, Pudong Road on September 25, 2023.

[0048] Figure 8is a status chart of the 'Red Fireball' on September 25, 2023 in the seventh scenario of Example 3 of the Longning Youle Road. DETAILED DESCRIPTION

[0049] The present application can be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details without departing from the spirit of the present application based on different viewpoints and applications. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0050] Some example embodiments of the present application are described for illustrative purposes, and it should be understood that the present application can be implemented in other ways not specifically shown in the drawings.

[0051] The present application provides a method for regulating the flowering period of Lagerstroemia indica, mainly including the following three steps:

[0052] S1, daily management of Lagerstroemia indica;

[0053] S2, flowering period regulation operation of Lagerstroemia indica;

[0054] S3, maintenance of Lagerstroemia indica after flowering period regulation.

[0055] The main purpose of step S1 is to make the plant grow vigorously, for example, scientific and standardized fertilization, water management, pruning and pest control of the plant, etc. It should be understood that the daily management scheme capable of achieving the purpose of making the plant grow vigorously is applicable to the present application.

[0056] Specifically, step S1 includes: S11, focusing on the prevention and control of Lagerstroemia indica pear-shaped insects, powdery mildew and Lagerstroemia indica long spot aphids.

[0057] Among them, Lagerstroemia indica pear-shaped insects harm the tender shoots, which can make the plant unable to differentiate flower buds. The prevention and control method of Lagerstroemia indica pear-shaped insects is: after spring budding, spray pesticides for prevention; if there is insect infestation, spray pesticides once every 10-15 days, and continuously spray pesticides 2-3 times, and the spraying time is easy in the morning and evening; all fruit sequences are cut off before the capsule is not cracked in the middle and late November of the previous year, which can destroy the overwintering place of Lagerstroemia indica pear-shaped insects and effectively reduce the insect density next year. The pesticides for preventing and controlling Lagerstroemia indica pear-shaped insects can be selected from high-efficiency cypermethrin, emamectin benzoate, and jieshun, etc. It should be understood that the pesticides capable of preventing and controlling Lagerstroemia indica pear-shaped insects are all applicable to the present application, and are not limited to the listed few.

[0058] Powdery mildew harms the whole plant, and affects growth and flowering. The prevention and treatment method of powdery mildew is: after the spring bud, spray the agent for prevention, if the disease has occurred, spray the agent once every 7-10 days, spray the agent for 2-3 times continuously, and the spraying time is easy in the morning and evening. The agent for preventing and treating powdery mildew can be selected from triazole wettable powder, myclobutanil or tebuconazole, etc. It should be understood that the agents that can be used to prevent and treat powdery mildew are all applicable to the present application, and are not limited to the few listed.

[0059] Long aphid of Lagerstroemia induces soot disease, affects growth and flowering. The prevention and treatment method of long aphid of Lagerstroemia is: after the spring bud, spray the agent for prevention, if the disease has occurred, spray the agent once every 10-15 days, spray the agent for 2-3 times continuously, and the spraying time is easy in the morning and evening. The agent for preventing and treating long aphid of Lagerstroemia can be selected from imidacloprid wettable powder (which can effectively control the annual insect density and the occurrence of soot disease), acetamiprid emulsion, thiamethoxam water dispersible granule, high-efficiency cypermethrin, etc. It should be understood that the agents that can be used to prevent and treat long aphid of Lagerstroemia are all applicable to the present application, and are not limited to the few listed.

[0060] Step S1 further comprises: S12, applying organic fertilizer to Lagerstroemia in the winter of the previous year, the fertilizer application amount is 8-12 kg / m 2 , preferably 10 kg / m 2 , the fertilization method is scattering, and the organic fertilizer is fully mixed with the surface soil by combining with soil loosening. The main purpose of fertilization is to increase soil nutrients and air permeability.

[0061] Step S1 further comprises: S13, soil moisture management: if the soil is not dry, do not water; if water, water thoroughly.

[0062] Step S1 further comprises: S14, severe short cutting of current-year branches in the winter of the previous year, and removal of dense branches, diseased branches, thin branches, old branches and dead branches, wherein the severe short cutting is to cut off 3 / 4-4 / 5 of the current-year growth of the branches. The purpose of severe short cutting is to concentrate nutrient supply.

[0063] Step S2, i.e. the flower period regulation operation of Lagerstroemia, is the key of the present application, which comprises the following two steps.

[0064] Step S21, selecting appropriate plants. The selected plants should meet: the leaves are dark green and shiny, the branches are strong, and there is no obvious disease and mechanical damage; Lagerstroemia prefers light, and sufficient light is beneficial to its growth and flower bud differentiation. Practice shows that shading will affect the flower period regulation effect, therefore, the growth environment of the selected plants should be sufficient light, and the plants without shading in the vertical direction of the crown are preferred.

[0065] Step S22, according to the flower period regulation target, pruning inflorescences or pruning branches of the plants in the middle and late May to the late August. More specifically, the pruning time and pruning amount preferably meet the following formula:

[0066] D t =1.931D p +28.734A p +8.1;

[0067] Among them, D t The number of days from August 1st to the target peak bloom date (for example, if the target peak bloom date is set to September 25th, then D) t =56), D p The number of days from August 1st to the pruning date (e.g., if pruning is on August 20th, then D). p =20; Pruning on July 25th, then D p =-6), A p The proportion of current-year shoots (excluding inflorescences) pruned (0≤A) p <1, when A p When the value is 0, it indicates that the inflorescence has been pruned.

[0068] D t D p and A p The following restrictions apply:

[0069] D t and D p D is an integer. t >25, D p ≤22, 8.1+1.931D p ≤D t <20.634+1.931D p .

[0070] When A p When A = 0, prune at the first plump axillary bud below the inflorescence; more specifically, prune about 0.5 cm above the first plump axillary bud below the inflorescence. p When A is ≥0.8, the pruned branch should have at least 3 axillary buds, that is, when A p When ≥0.8, if according to A p When pruning according to the actual value, if the pruned branch has fewer than 3 axillary buds, it should be pruned according to the method of retaining 3 axillary buds, instead of following A. p The actual value is pruned.

[0071] To facilitate understanding of the above formula, the following example is provided:

[0072] If we set the target peak bloom date as September 25th and the pruning date as August 20th, then we can know that D... t =56, D p =20, D t =56 and D p Substituting 20 into the above formula Dt = 1.931D p + 28.734A p + 8.1, A can be calculated p = 0.32, i.e. 0.32 of the current year branches are pruned. That is, 0.32 of the current year branches (close to 1 / 3 of the current year branches) are pruned on August 20, so that the plant reaches the beginning of the second flowering peak around September 25.

[0073] By the above method of regulating the flowering period of Lagerstroemia indica, the second flowering peak of Lagerstroemia indica is regulated to September to the middle of October, which enriches the types of woody ornamental plants during this period, reduces the amount of grass flowers, ensures the flower landscape effect, and reduces the maintenance cost.

[0074] After pruning Lagerstroemia indica, the subsequent maintenance step S3 is also important, which is embodied in fertilization, water management, and pest control.

[0075] Regarding pest control, specifically, step S31, within 1-7 days after pruning, insecticides and fungicides are sprayed to prevent the occurrence of pests such as Lagerstroemia indica pear weevils, powdery mildew, and Lagerstroemia indica long-spotted aphids.

[0076] The prevention method for Lagerstroemia indica pear weevils is to spray pesticides within 1-7 days after pruning to prevent Lagerstroemia indica pear weevils. The pesticides for preventing Lagerstroemia indica pear weevils can be selected from high-efficiency cypermethrin, emamectin benzoate, and dieldrin, and it should be understood that all pesticides that can be used to prevent Lagerstroemia indica pear weevils are applicable to the present application and are not limited to the few listed.

[0077] The prevention method for powdery mildew is to spray pesticides within 1-7 days after pruning to prevent powdery mildew. The pesticides for preventing powdery mildew can be selected from triadimefon wettable powder, myclobutanil, or tebuconazole, and it should be understood that all pesticides that can be used to prevent powdery mildew are applicable to the present application and are not limited to the few listed.

[0078] The prevention method for Lagerstroemia indica long-spotted aphids is to spray pesticides within 1-7 days after pruning to prevent Lagerstroemia indica long-spotted aphids. The pesticides for preventing Lagerstroemia indica long-spotted aphids can be selected from imidacloprid wettable powder (which can effectively control the annual insect density and soot disease), acetamiprid emulsion, thiamethoxam water dispersible granules, high-efficiency cypermethrin, and it should be understood that all pesticides that can be used to prevent Lagerstroemia indica long-spotted aphids are applicable to the present application and are not limited to the few listed.

[0079] Regarding fertilization, specifically, step S32, fertilization: after the flowering period regulation operation on Lagerstroemia indica, compound superphosphate fertilizer is applied to promote flower bud differentiation. The fertilization method adopts hole or ring fertilization, and the fertilization holes and rings are at the outer edge of the vertical projection of the tree crown, and water should be poured immediately after fertilization.

[0080] As for water management, specifically for step S33, the implementation of the flowering regulation operation is in the high-temperature and dry season, if the air temperature > 35℃, at least 1 time of watering per day should be ensured, and the watering should be thorough, whether the water is lacking can be judged by observing the soil condition (cracking, whitening, etc.) and the plant state (tree leaves without luster, wilting, etc.), the watering frequency should be appropriately increased, and the watering should be carried out after sunset or before sunrise. In the case of no water accumulation, sufficient water supply is the key to the secondary flower bud differentiation of Lagerstroemia indica.

[0081] In addition, the application also provides the application of the Lagerstroemia indica flowering regulation method in regulating the flowering of Lagerstroemia indica. Through the above-mentioned Lagerstroemia indica flowering regulation method, the secondary flowering peak flowering period of Lagerstroemia indica is regulated to September to the middle and early October.

[0082] Embodiment 1

[0083] The embodiment provides a specific implementation mode of the Lagerstroemia indica flowering regulation method, wherein the Lagerstroemia indica variety is Lagerstroemia indica 'Swan Velvet', the target peak flowering start date D t is set to September 25, the pruning time D p is August 20, D t = 59 and D p = 22 are substituted into the above formula D t = 1.931D p + 28.734A p + 8.1, A p = 0.32 can be calculated.

[0084] The Lagerstroemia indica flowering regulation method in the embodiment comprises the following steps:

[0085] S11, Lagerstroemia indica pear-shaped weevils, powdery mildew and Lagerstroemia indica long spot aphids are prevented and treated. The prevention and treatment method of Lagerstroemia indica pear-shaped weevils is: after budding in spring, high-efficiency cypermethrin is sprayed for prevention; if the pests have occurred, high-efficiency cypermethrin is sprayed once every 10-15 days, and high-efficiency cypermethrin is sprayed for 2-3 times continuously, and the spraying time is in the morning and evening; all fruit sequences are cut off before the capsule cracks in the middle and early November of the previous year. The prevention and treatment method of powdery mildew is: after budding in spring, flusilazole is sprayed for prevention, if the disease has occurred, flusilazole is sprayed once every 7-10 days, and flusilazole is sprayed for 2-3 times continuously, and the spraying time is in the morning and evening. The prevention and treatment method of Lagerstroemia indica long spot aphids is: after budding in spring, imidacloprid wettable powder is sprayed for prevention, if the pests have occurred, imidacloprid wettable powder is sprayed once every 10-15 days, and imidacloprid wettable powder is sprayed for 2-3 times continuously, and the spraying time is in the morning and evening.

[0086] S12, organic fertilizer is applied to Lagerstroemia indica in the winter of the previous year, the application amount is 10 kg / m 2 , the application method is scattering, and the organic fertilizer is fully mixed with the surface soil by combining with soil loosening.

[0087] S13, soil moisture management: if the soil is not dry, do not water; if water, water thoroughly.

[0088] S14, the previous winter to the current year branches severe short, and thinning dense branches, branches, disease, weak, old and dead branches, which severe short is pruning away 3 / 4 of the current year growth.

[0089] S21, select the appropriate plant. The selected plant meets: leaf deep green luster, branches strong, no obvious disease and mechanical damage; the selected plant growth environment with sufficient light, the vertical direction of the crown without obstruction.

[0090] S22, according to the flowering control target, pruning 0.32 of the current year branches on August 20.

[0091] S31, within 1-7 days after pruning, spraying insecticides and fungicides to prevent the occurrence of purple willow weevils, powdery mildew and purple willow long aphids. The prevention method of purple willow weevils is: within 1-7 days after pruning, spraying high-efficiency cypermethrin to prevent purple willow weevils. The prevention method of powdery mildew is: within 1-7 days after pruning, spraying myclobutanil to prevent powdery mildew. The prevention method of purple willow long aphids is: within 1-7 days after pruning, spraying imidacloprid wettable powder to prevent purple willow long aphids.

[0092] S32, fertilization: after the flowering control operation of purple willow, apply once a compound fertilizer of superphosphate of lime, the fertilization method adopts hole fertilization, the fertilization hole is at the vertical projection of the outer edge of the crown, and water should be poured immediately after fertilization.

[0093] S33, the implementation of the flowering control operation is in the high temperature and drought season, if the temperature is > 35℃, at least 1 day water 1 time, water needs to be poured thoroughly, whether the water is lacking can be judged by observing the soil condition (cracking, whitening, etc.) and the plant state (tree leaves without luster, wilting, etc.), the water frequency is appropriately increased, and the water is preferably carried out after sunset or before sunrise.

[0094] Through the above method of flowering control of purple willow, the secondary flowering and flowering beginning of purple willow is controlled to about September 25. Figure 1 As an application case of the embodiment, it shows the blooming state of purple willow 'Swan Velvet' on September 27 in Putuo Xincun Road.

[0095] Embodiment 2

[0096] The embodiment provides another specific implementation manner of the method for controlling the flowering of purple willow, wherein the purple willow variety is selected as purple willow 'Red Rocket', the target flowering beginning D t is set as September 16, the pruning time D p is August 14, D t = 47 and D p= 14 into the above formula D t = 1.931D p + 28.734A p + 8.1, A can be calculated p = 0.41.

[0097] The method for flowering regulation of Lagerstroemia indica in the embodiment comprises the following steps:

[0098] S11, Lagerstroemia oryza, powdery mildew and Lagerstroemia long spot aphid are prevented and treated. The prevention and treatment method of Lagerstroemia oryza is as follows: after budding in spring, avermectin salt is sprayed for prevention; if the insect infestation has occurred, avermectin salt is sprayed once every 10-15 days, and avermectin salt is sprayed for 2-3 times continuously, and the spraying time is in the morning and evening; all fruit sequences are cut off before the capsule is not cracked in the middle and late November of the previous year. The prevention and treatment method of powdery mildew is as follows: after budding in spring, triadimefon wettable powder is sprayed for prevention, if the disease has occurred, triadimefon wettable powder is sprayed once every 7-10 days, and triadimefon wettable powder is sprayed for 2-3 times continuously, and the spraying time is in the morning and evening. The prevention and treatment method of Lagerstroemia long spot aphid is as follows: after budding in spring, dinotefuran emulsion is sprayed for prevention, if the insect infestation has occurred, dinotefuran emulsion is sprayed once every 10-15 days, and dinotefuran emulsion is sprayed for 2-3 times continuously, and the spraying time is in the morning and evening.

[0099] S12, organic fertilizer is applied to Lagerstroemia indica in winter of the previous year, the application amount is 12 kg / m 2 , the application method is scattering, and the organic fertilizer is fully mixed with the surface soil by combining with soil loosening.

[0100] S13, soil moisture management: if the soil is not dry, do not water; if water is poured, pour thoroughly.

[0101] S14, the current year's branches are severely shortened in winter of the previous year, and the dense branches, diseased and insect branches, thin branches, old branches and dead branches are removed, wherein the severe shortening is that 4 / 5 of the current year's growth of the branches is pruned off.

[0102] S21, appropriate plants are selected. The selected plants meet the following conditions: the leaves are dark green and shiny, the branches are strong, there is no obvious disease and insect damage and mechanical damage; the growth environment of the selected plants is sufficient in light, and the vertical direction of the crown is not blocked.

[0103] S22, according to the flowering regulation target, 0.41.

[0104] S31, within 1-7 days after pruning, spray insecticides and fungicides to prevent the occurrence of purpleleaf mulberry weevils, powdery mildew and purpleleaf mulberry long-spotted aphids. The prevention method of purpleleaf mulberry weevils is: within 1-7 days after pruning, spray emamectin benzoate to prevent purpleleaf mulberry weevils. The prevention method of powdery mildew is: within 1-7 days after pruning, spray triadimefon wettable powder to prevent powdery mildew. The prevention method of purpleleaf mulberry long-spotted aphids is: within 1-7 days after pruning, spray acetamiprid emulsion to prevent purpleleaf mulberry long-spotted aphids.

[0105] S32, fertilization: after the flowering period regulation operation of purpleleaf mulberry is performed, apply once a compound fertilizer of calcium superphosphate, and the fertilization is performed in a ring manner, and the fertilization ring is at the vertical projection outer edge of the tree crown, and water should be poured immediately after fertilization.

[0106] S33, the flowering period regulation operation is implemented in a high-temperature and dry season, if the air temperature is greater than 35 DEG C, at least 1 time of watering per day should be ensured, the watering should be poured thoroughly, whether the soil is water-deficient can be judged by observing the soil conditions (cracking, whitening, etc.) and the plant state (tree leaves without luster, wilting, etc.), the watering frequency can be appropriately increased, and the watering is preferably performed after sunset or before sunrise.

[0107] Through the above-mentioned method for regulating the flowering period of purpleleaf mulberry, the secondary flowering and full-blooming initial stage of purpleleaf mulberry is regulated to about September 16.

[0108] Example 3

[0109] In this example, the above-mentioned method for regulating the flowering period of purpleleaf mulberry is applied to actual situations, and the specific steps are similar to those in Examples 1-2, and the treatment results of purpleleaf mulberry in multiple places are shown below. Figures 1-7 The blooming states of purpleleaf mulberry in the seven scenes in Example 3 are shown. Specifically, Figure 1 The blooming state diagram of 'Swan Velvet' in the first scene on September 27, 2020 in Jing'an Zhijiang Middle Road is shown, wherein 0.32 of the current-year branches are pruned on August 20, 2020; Figure 2 The blooming state diagram of 'Swan Velvet' in the second scene on September 9, 2020 in Jing'an Zhijiang Middle Road is shown, wherein 0.3 of the current-year branches are pruned on August 10, 2020; Figure 3 The blooming state diagram of 'Swan Velvet' in the third scene on September 10, 2020 in Putuo Xincun Road is shown, wherein 0.47 of the current-year branches are pruned on August 10, 2020; Figure 4 The blooming state diagram of WT-01 in the fourth scene on September 15, 2020 in Huangpu District The Bund is shown, wherein 0.3 of the current-year branches are pruned on August 10, 2020; Figure 5 The blooming state diagram of 'Powder Crystal' in the fifth scene on September 23, 2022 in Songjiang Sichen Road is shown, wherein 0.19 of the current-year branches are pruned on August 22, 2022; Figure 6A diagram showing the blooming state of 'Swan Velvet' in Pudong New Area Pudian Road on September 25, 2023, wherein only the inflorescences were pruned on August 21, 2023; Figure 7 A diagram showing the blooming state of 'Red Fireball' in Changning Youle Road on September 25, 2023, wherein 0.32 of the current-year branches were pruned on August 20, 2023.

[0110]

[0111] From the above results, it can be seen that the method for regulating the flowering period of Lagerstroemia indica according to the present application can regulate the secondary flowering period of Lagerstroemia indica to the ideal effect according to the target initial flowering period, enrich the types of woody flowering plants during major festivals (such as the National Day), and reduce the amount of grass flowers.

[0112] The above examples are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present application shall be covered by the claims of the present application.

Claims

1. A method for regulating flowering of a crape myrtle, the method comprising, The method comprises the following steps: S1, daily management of Lagerstroemia indica; S2, flower period regulation operation on Lagerstroemia indica; S3, maintenance of Lagerstroemia indica after the flower period regulation operation; The step S2 comprises: S21, selecting suitable plants, S22, pruning inflorescences or pruning branches of the plants in the period from mid-late May to late August according to the flower period regulation target, and the pruning time and pruning amount satisfy the following formula: D t = 1.931D p + 28.734A p + 8.1; where D t is the number of days from August 1 to the target beginning of the flowering period, D p is the number of days from August 1 to the pruning time, A p is the proportion of the current year shoots, excluding the inflorescence part, that are pruned off; D t , D p and A p meet the following restrictions: D t and D p is an integer, D t > 25, D p ≤ 22, 8.1 + 1.931D p ≤ D t < 20.634 + 1.931D p ; 0 < A p < 1, when A p = 0, for pinching the inflorescences.

2. The method for regulating flowering of C. odorata according to claim 1, wherein, When A p = 0, prune at the first full axillary bud below the inflorescence; when A p ≥ 0.8, the pruned shoot should have at least 3 axillary buds.

3. The method for regulating flowering of C. tetrandra in claim 1 or 2, wherein, The method for regulating the flower period of Lagerstroemia indica can regulate the secondary flowering and blooming period of Lagerstroemia indica to the period from September to mid-October.

4. The method for regulating flowering of C. odorata according to claim 1, wherein, The plants selected in the step S21 should satisfy the following conditions: no obstruction in the vertical direction of the crown, healthy growth, and no obvious diseases and insect pests.

5. The method for regulating flowering of C. odorata according to claim 1, wherein, The step S1 comprises: S11, focusing on the prevention and control of Pythoidea indica, powdery mildew and Macrosiphum lagerstroemiae, wherein, The prevention and control method of Pythoidea indica is: spraying a pesticide for prevention after budding in spring, spraying the pesticide once every 10-15 days if the insect pests have occurred, and spraying the pesticide for 2-3 times continuously; The prevention and control method of powdery mildew is: spraying a pesticide for prevention after budding in spring, spraying the pesticide once every 7-10 days if the diseases have occurred, and spraying the pesticide for 2-3 times continuously; The prevention and control method of Macrosiphum lagerstroemiae is: spraying a pesticide for prevention after budding in spring, spraying the pesticide once every 10-15 days if the insect pests have occurred, and spraying the pesticide for 2-3 times continuously.

6. The method for regulating flowering of C. odorata according to claim 1, wherein, The step S1 further comprises: S12, the previous winter to apply organic fertilizer, fertilizer amount for 8-12kg / m 2 , the way of fertilization is scattering, and combined with soil loosening, the organic fertilizer is mixed with topsoil fully; S13, soil moisture management: if the soil is not dry, no water is poured; if water is poured, the water is poured thoroughly; S14, heavily shortening the current-year branches in winter of the previous year, and removing dense branches, diseased branches, thin branches, old branches and dead branches, wherein the heavy shortening is to prune 3 / 4-4 / 5 of the current-year growth of the branches.

7. The method for regulating flowering of C. odorata according to claim 1, wherein, The step S3 comprises: S31, spraying an insecticide and a fungicide within 1-7 days after pruning to prevent the occurrence of Pythoidea indica, powdery mildew and Macrosiphum lagerstroemiae.

8. The method for regulating flowering of C. odorata according to claim 1, wherein, The step S3 further comprises: S32, fertilization: after the flower period regulation operation on Lagerstroemia indica, applying a compound superphosphate fertilizer once, and the fertilization is performed by hole fertilization or ring fertilization, and the fertilization holes and the fertilization rings are arranged at the outer edge of the vertical projection of the crown.

9. Application of the method for regulating the flower period of Lagerstroemia indica according to any one of claims 1-8 in regulating the flower period of Lagerstroemia indica.

Images