Hydroponic flower rooting liquid fertilizer, and preparation method and application thereof

Abstract

The present application relates to the technical field of nutrient solution, in particular to a hydroponic flower rooting liquid fertilizer as well as a preparation method and application thereof, the liquid fertilizer comprises the following components in mass percentage: 8-16% of potassium dihydrogen phosphate; 12-18% of calcium nitrate; 2-4% of potassium fulvate; 0.003-0.006% of naphthalene acetic acid; 0.003-0.008% of potassium indole butyric acid; 0.10-0.20% of citric acid; and the balance is water; rooting-nutrition-stability multifunctional integration is realized, and the risk brought by user self-mixing is avoided; secondly, the water culture rooting period is accurately designed, the synergistic effect of phosphorus, calcium and biological stimulants is strengthened, so as to improve the rooting quality and speed; finally, the product is completely water-soluble, has no precipitation and does not block, is safe, has good antibacterial performance, and effectively improves the use performance of the liquid fertilizer.

Description

Technical Field

[0001] This invention relates to the field of nutrient solution technology, specifically to a liquid fertilizer for promoting root growth in hydroponically grown flowers, its preparation method, and its application. Background Technology

[0002] Hydroponics is a process that utilizes various comprehensive technical measures to induce a series of biochemical mutations in plants, thereby encouraging them to grow new roots that can adapt to the low-oxygen environment of water. Hydroponically grown flowers face unique physiological and environmental challenges during the rooting stage: the dissolved oxygen level in the water is far lower than that in the soil pores, requiring the roots to adapt to a low-oxygen environment; the hydroponic solution lacks the natural barrier of soil microorganisms, making cut surfaces and new roots highly susceptible to microbial infection; and the specific nutrient requirements for phosphorus, calcium, and other elements during the rooting period differ significantly from those during the mature plant stage.

[0003] In existing technologies, rooting agents and nutrient solutions are usually provided separately, requiring users to mix them themselves. Because rooting agents (such as naphthaleneacetic acid, indolebutyric acid, etc.) and calcium and phosphorus ions in the nutrient solution easily form insoluble precipitates (such as calcium naphthaleneacetate, calcium phosphate, etc.) under specific concentration and pH conditions, non-professional users find it difficult to master the correct mixing order and concentration ratio. This can easily lead to problems such as precipitation and seedling burn due to pH and ion concentration mismatch, seriously affecting the safety and convenience of use. Conventional nutrient solution formulas often refer to Hoagland formulas for soil cultivation or Japanese garden experiment formulas, and are not optimized for the specific nutritional needs of hydroponics during the rooting period. The rooting period requires high phosphorus to promote root cell division and elongation, high calcium to maintain cell wall stability and root tip meristem activity, and specific biostimulants (such as growth regulators like naphthaleneacetic acid and indolebutyric acid) to initiate the formation of adventitious root primordia. Existing products do not provide sufficient precision in supplying these nutrients and often contain insoluble carriers or fillers, which can easily cause blockages in hydroponic circulation systems. In addition, in a hydroponic environment, the roots are directly exposed to the aqueous solution and lack the competitive inhibition of soil microorganisms. The cut surfaces and new roots are highly susceptible to infection by pathogenic microorganisms such as Pythium and Fusarium, leading to root rot and seedling death. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid fertilizer for promoting root growth in hydroponic flowers, its preparation method, and its application. This fertilizer integrates root promotion, nutrition, and stabilization, avoiding the risks associated with users mixing their own products. Secondly, it is precisely designed for the hydroponic rooting period, enhancing the synergistic effect of phosphorus, calcium, and biostimulants to improve rooting quality and speed. Finally, it ensures the product is completely water-soluble, free of sediment and clogging, highly safe, and possesses good antibacterial properties, effectively improving the performance of the liquid fertilizer.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a liquid fertilizer for promoting rooting of hydroponic flowers, comprising the following components by mass percentage: 8-16% potassium dihydrogen phosphate; 12-18% calcium nitrate; 2-4% potassium humate; 0.003-0.006% naphthaleneacetic acid; 0.003-0.008% potassium indolebutyrate; 0.10-0.20% citric acid; with the balance being water.

[0006] In one possible implementation, the mass ratio of naphthaleneacetic acid to potassium indolebutyrate is 1:1 to 1:2.

[0007] Secondly, the present invention provides a method for preparing the aforementioned liquid fertilizer for promoting rooting of hydroponic flowers, characterized in that it comprises: S1. Pre-acidification: Dissolve the mineral-derived potassium humate separately, add some citric acid for pre-acidification treatment, and adjust the pH value to 5.5-6.5 to obtain the pre-acidification intermediate solution; S2. Separate liquid preparation: Dissolve calcium nitrate separately in the first part of water to prepare solution A; dissolve potassium dihydrogen phosphate, naphthaleneacetic acid, potassium indolebutyrate and the remaining citric acid together in the second part of water to prepare solution B; S3. Speed-controlled mixing: While continuously stirring, slowly pour liquid A into liquid B, then add the pre-acidified intermediate liquid from step S1, and stir until homogeneous; S4. Volume Adjustment: Add water to 100% of the total weight, stir continuously for 20-40 minutes, and adjust the pH value to 5.5-6.5 with potassium carbonate solution; S5. Filtration and filling: The pH-adjusted solution is filtered through a 0.45-micron pore size filter material and then filled to obtain the liquid fertilizer.

[0008] In one possible implementation, the first portion of water is 1 / 4 to 1 / 3 of the total water volume, and the second portion of water is 1 / 4 to 1 / 3 of the total water volume.

[0009] In one possible implementation, the rate at which liquid A is poured into liquid B is 5-10 mL / min, and the stirring speed is 200-400 rpm.

[0010] In one possible implementation, determining whether the mixing is uniform in step S3 includes: Measurement points were set at the top, middle, and bottom of the container to obtain detection data; The calculation is performed based on the detection data to obtain the calculation result; The mixing process is judged based on the calculation results to determine whether the mixing is uniform.

[0011] Thirdly, the present invention also provides an application of the aforementioned hydroponic flower rooting liquid fertilizer in promoting the rooting of hydroponic flowers.

[0012] In one possible implementation, the hydroponic flowers are selected from one or more of the following: pothos, spider plant, pennywort, lucky bamboo, ivy, peace lily, arrowhead vine, monstera, and peperomia.

[0013] In one possible implementation, the liquid fertilizer is diluted with water at a ratio of 800-1500 times, and the resulting diluted solution is used directly as a hydroponic solution. The hydroponic solution is changed every 5 days in the early stage of hydroponics, and then changed every 7 days after new roots grow.

[0014] This invention proposes a liquid fertilizer for hydroponic flower rooting, its preparation method, and its application. It achieves a multi-functional integration of root promotion, nutrition, and stabilization, avoiding the risks associated with users mixing their own fertilizers. Secondly, it is precisely designed for the hydroponic rooting period, strengthening the synergistic effect of phosphorus, calcium, and biostimulants to improve rooting quality and speed. Finally, the process employs pre-acidification and step-by-step mixing, combined with fine filtration, to ensure the product is completely water-soluble, free of sediment and clogging, highly safe, and has good antibacterial properties, effectively improving the performance of the liquid fertilizer. It is suitable for both home gardening and large-scale production. Attached Figure Description

[0015] Figure 1 A schematic diagram illustrating a liquid fertilizer for promoting root growth in hydroponically grown flowers, as proposed in this invention; Figure 2 This is a schematic diagram illustrating the change of the mixing homogeneity index proposed in this invention over time. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0018] like Figure 1 As shown, this invention provides a liquid fertilizer for promoting rooting of hydroponic flowers, comprising the following components by weight percentage: potassium dihydrogen phosphate 8-16%; calcium nitrate 12-18%; potassium humate 2-4%; naphthaleneacetic acid 0.003-0.006%; potassium indolebutyrate 0.003-0.008%; citric acid 0.10-0.20%; the balance being water. Potassium humate from mineral source is dissolved separately, and a portion of citric acid is added for pre-acidification treatment. The pH value is adjusted to 5.5-6.5 to obtain a pre-acidification intermediate solution. Calcium nitrate is dissolved separately in the first portion of water to prepare solution A. Potassium dihydrogen phosphate, naphthaleneacetic acid, potassium indolebutyrate, and the remaining citric acid are dissolved together in the second portion of water to prepare solution B. Under continuous stirring, solution A is slowly poured into solution B, and then the pre-acidification intermediate solution is added and stirred evenly. Water is added to bring the total weight to 100%, and stirring is continued for 20-40 minutes. The pH value is adjusted to 5.5-6.5 with potassium carbonate solution. The pH-adjusted solution is filtered and bottled to obtain the liquid fertilizer.

[0019] In one possible implementation, the mass ratio of naphthaleneacetic acid to potassium indolebutyrate is 1:1 to 1:2.

[0020] Secondly, the present invention provides a method for preparing the aforementioned liquid fertilizer for promoting rooting of hydroponic flowers, characterized in that it comprises: S1. Pre-acidification: Dissolve the mineral-derived potassium humate separately, add some citric acid for pre-acidification treatment, and adjust the pH value to 5.5-6.5 to obtain the pre-acidification intermediate solution; S2. Separate liquid preparation: Dissolve calcium nitrate separately in the first part of water to prepare solution A; dissolve potassium dihydrogen phosphate, naphthaleneacetic acid, potassium indolebutyrate and the remaining citric acid together in the second part of water to prepare solution B; S3. Speed-controlled mixing: While continuously stirring, slowly pour liquid A into liquid B, then add the pre-acidified intermediate liquid from step S1, and stir until homogeneous; S4. Volume Adjustment: Add water to 100% of the total weight, stir continuously for 20-40 minutes, and adjust the pH value to 5.5-6.5 with potassium carbonate solution; S5. Filtration and filling: The pH-adjusted solution is filtered through a 0.45-micron pore size filter material and then filled to obtain the liquid fertilizer.

[0021] In one possible implementation, the first portion of water is 1 / 4 to 1 / 3 of the total water volume, and the second portion of water is 1 / 4 to 1 / 3 of the total water volume.

[0022] In one possible implementation, the rate at which liquid A is poured into liquid B is 5-10 mL / min, and the stirring speed is 200-400 rpm.

[0023] Example 1: A liquid fertilizer for promoting rooting of hydroponic flowers, comprising the following components by mass percentage: 12% potassium dihydrogen phosphate, 15% calcium nitrate, 3% mineral-derived potassium humate, 0.004% naphthaleneacetic acid, 0.006% potassium indolebutyrate, 0.15% citric acid, with the balance being water. The mass ratio of naphthaleneacetic acid to potassium indolebutyrate is 1:1.5.

[0024] Preparation method: Take 1 / 5 of the total water volume of deionized water, dissolve the mineral-derived potassium humate separately, stir until completely dissolved, add a portion of citric acid for pre-acidification, stir continuously for 5 minutes, adjust the pH of the solution to 6.0, and obtain a uniform and transparent pre-acidified intermediate solution for later use.

[0025] Take 1 / 3 of the total water volume as the first part of the water, add calcium nitrate at room temperature, and stir at 300 rpm for 10 minutes until completely dissolved to make a clear solution A without precipitate; take another 1 / 3 of the total water volume as the second part of the water, add potassium dihydrogen phosphate, naphthaleneacetic acid, potassium indolebutyrate and the remaining citric acid, and stir at 300 rpm for 8 minutes until all materials are completely dissolved to make solution B.

[0026] Turn on the stirring device and set the stirring speed to 300 rpm. Slowly and uniformly add solution A to solution B at a rate of 8 mL / min. After the addition is complete, add the pre-acidified intermediate solution and continue stirring for 15 min until the system is homogeneous.

[0027] Add the remaining deionized water to 100% of the total mass and stir continuously at a constant temperature for 30 minutes; use 10wt% potassium carbonate solution to slowly fine-tune the pH of the system to 6.0, with no precipitation or flocculation throughout the process.

[0028] The pH-adjusted solution is precisely filtered using a 0.45-micron pore size filter material to remove trace impurities. After aseptic filling, the finished product, hydroponic flower rooting liquid fertilizer, is obtained.

[0029] Example 2: A liquid fertilizer for promoting rooting of hydroponic flowers, comprising the following components by mass percentage: 8% potassium dihydrogen phosphate, 12% calcium nitrate, 2% mineral-derived potassium humate, 0.003% naphthaleneacetic acid, 0.003% potassium indolebutyrate, 0.10% citric acid, with the remainder being water; wherein the mass ratio of naphthaleneacetic acid to potassium indolebutyrate is 1:1.

[0030] Preparation method: Take 1 / 5 of the total water volume of deionized water, dissolve the mineral-derived potassium humate separately, stir until completely dissolved, add a portion of citric acid for pre-acidification, stir continuously for 5 minutes, adjust the pH of the solution to 5.5, and obtain a uniform and transparent pre-acidified intermediate solution for later use.

[0031] Take 1 / 4 of the total water volume as the first part of the water, add calcium nitrate at room temperature, and stir at 200 rpm for 12 minutes until completely dissolved to prepare a clear solution A without precipitate; take another 1 / 4 of the total water volume as the second part of the water, add potassium dihydrogen phosphate, naphthaleneacetic acid, potassium indolebutyrate and the remaining citric acid, and stir at 200 rpm for 10 minutes until all materials are completely dissolved to prepare solution B.

[0032] Turn on the stirring device and set the stirring speed to 200 rpm. Slowly and uniformly add solution A to solution B at a rate of 5 mL / min. After the addition is complete, add the pre-acidified intermediate solution and continue stirring for 15 min until the system is homogeneous.

[0033] Add the remaining deionized water to 100% of the total mass and stir continuously at a constant temperature for 20 minutes; use 10wt% potassium carbonate solution to slowly fine-tune the pH of the system to 5.5, with no precipitation or flocculation throughout the process.

[0034] The pH-adjusted solution is precisely filtered using a 0.45-micron pore size filter material to remove trace impurities. After aseptic filling, the finished product, hydroponic flower rooting liquid fertilizer, is obtained.

[0035] Example 3: A liquid fertilizer for promoting rooting of hydroponic flowers, comprising the following components by mass percentage: 16% potassium dihydrogen phosphate, 18% calcium nitrate, 4% mineral-derived potassium humate, 0.006% naphthaleneacetic acid, 0.008% potassium indolebutyrate, 0.20% citric acid, with the remainder being water; wherein the mass ratio of naphthaleneacetic acid to potassium indolebutyrate is 1:1.33.

[0036] Preparation method: Take 1 / 5 of the total water volume of deionized water, dissolve the mineral-derived potassium humate separately, stir until completely dissolved, add a portion of citric acid for pre-acidification, stir continuously for 5 minutes, adjust the pH of the solution to 6.5, and obtain a uniform and transparent pre-acidified intermediate solution for later use.

[0037] Take 1 / 3 of the total water volume as the first part of the water, add calcium nitrate at room temperature, and stir at 400 rpm for 8 minutes until completely dissolved to make a clear solution A without precipitate; take another 1 / 3 of the total water volume as the second part of the water, add potassium dihydrogen phosphate, naphthaleneacetic acid, potassium indolebutyrate and the remaining citric acid, and stir at 400 rpm for 6 minutes until all materials are completely dissolved to make solution B.

[0038] Turn on the stirring device and set the stirring speed to 400 rpm. Slowly and uniformly add solution A to solution B at a rate of 10 mL / min. After the addition is complete, add the pre-acidified intermediate solution and continue stirring for 10 min until the system is homogeneous.

[0039] Add the remaining deionized water to 100% of the total mass and stir continuously at a constant temperature for 40 minutes; use 10wt% potassium carbonate solution to slowly fine-tune the pH of the system to 6.5, with no precipitation or flocculation throughout the process.

[0040] The pH-adjusted solution is precisely filtered using a 0.45-micron pore size filter material to remove trace impurities. After aseptic filling, the finished product, hydroponic flower rooting liquid fertilizer, is obtained.

[0041] Set the comparison scale: Comparative Example 1 (Clean Water Control): Deionized water was used directly as the hydroponic solution without adding any fertilizer or rooting agent.

[0042] Comparative Example 2 (Conventional Nutrient Solution): Commercially available Hogland nutrient solution (general type) was used, diluted 1000 times according to the instructions, without rooting regulators.

[0043] Comparative Example 3 (Conventional Rooting Agent + Nutrient Solution Used Separately): Cuttings were soaked in commercially available rooting powder (0.1% naphthaleneacetic acid (NAA) wettable powder) for 10 minutes, and then planted in a 1000-fold diluted Hoagland nutrient solution for cultivation. This method simulates the user's method of mixing rooting agent and nutrient solution themselves.

[0044] Comparative Example 4 (containing only naphthaleneacetic acid (NAA), without potassium indolebutyrate (IBA-K): The formulation is the same as in Example 1, but potassium indolebutyrate is removed, and only naphthaleneacetic acid is retained. The remaining components and preparation methods remain unchanged.

[0045] Comparative Example 5 (containing only potassium indolebutyrate (IBA-K) and no naphthaleneacetic acid (NAA): The formulation is the same as in Example 1, but naphthaleneacetic acid is removed and only potassium indolebutyrate is retained. The other components and preparation methods remain unchanged.

[0046] Comparative Example 6 (without citric acid): The formulation is the same as in Example 1, but citric acid is removed, while the remaining components and preparation methods remain unchanged. No pre-acidification treatment is performed during the preparation process, and the mineral-derived potassium humate is directly mixed with other components.

[0047] Comparative Example 7 (one-time mixing, no separation): The formula is the same as in Example 1, but the preparation method is changed to add all components to all deionized water at once and stir to dissolve, without separation or controlled mixing.

[0048] Experiment 1: The effect of each example on the rooting effect of hydroponically grown pothos; Experimental materials: Selected green ivy cuttings with uniform growth and free from pests and diseases. Each cutting retained 2 nodes and 1 leaf, totaling 270 cuttings, which were randomly divided into 9 groups of 30 cuttings each.

[0049] Experimental Methods: The liquid fertilizers of each embodiment and comparative examples 1-3 were diluted with water at a ratio of 1000 to prepare hydroponic solutions. Cuttings were then implanted into hydroponic containers. Hydroponic conditions: temperature 25 ± 2 degrees Celsius, relative humidity 70 ± 5%, light intensity 3000-5000 lux, and a light cycle of 12h / 12h (light / dark). The hydroponic solution was changed every 5 days in the early stages of hydroponics, and then every 7 days after new roots emerged. The rooting time, number of roots on day 15, average root length, and survival rate were observed and recorded for each group, as shown in Table 1. Table 1 ; The liquid fertilizers in Examples 1-3 of this invention significantly promote rooting in hydroponically grown pothos, shortening the initial rooting time by 7-9 days compared to the water control and by 4-6 days compared to conventional nutrient solutions. Simultaneously, they also significantly improve the number of roots after 15 days, the average root length after 15 days, and the survival rate. Example 1 is the optimal example, requiring only 5 days for initial rooting, achieving 18.6 roots after 15 days, an average root length of 6.8 cm after 15 days, and a survival rate of 98%. Comparative Example 3 demonstrates that this invention is not simply a combination of rooting agent and nutrient solution, but rather achieves superior root-promoting effects through the precise ratio and synergistic effect of each component.

[0050] Experiment 2: Synergistic effect of naphthaleneacetic acid and potassium indolebutyrate; The experimental materials and methods were the same as in Experiment 1. Using pothos as the experimental subject, the differences in root-promoting effects between Example 1 and Comparative Examples 4 and 5 were examined, as shown in Table 2. Table 2 ; Example 1, containing both naphthaleneacetic acid (NAA) and potassium indolebutyrate (IBA-K), demonstrated a root-promoting effect far exceeding the simple sum of the effects of using either ingredient alone. Comparative Example 4 showed 9.1 roots after 15 days, and Comparative Example 5 showed 8.3 roots, with a theoretical sum of 17.4 roots. However, Example 1 achieved an actual root count of 18.6 roots, exceeding the theoretical sum by 6.9%, indicating that NAA and IBA-K, in a specific ratio, produced a synergistic effect beyond simple addition. From the perspective of root quantity, Example 1 showed an improvement of over 50% compared to Comparative Examples 4 and 5, fully demonstrating the synergistic effect of the dual growth regulator combination. From the perspective of root length, a similarly significant synergistic effect was observed.

[0051] Naphthaleneacetic acid (NAA) primarily increases the number of adventitious roots by promoting cell division and root primordium initiation, while potassium indolebutyrate (IBA-K) primarily increases root length and branching by promoting cell elongation and lateral root development. Both work synergistically through different mechanisms at different stages and aspects of root development, producing a synergistic effect greater than the sum of their parts.

[0052] like Figure 2 As shown, in one possible implementation, step S3, determining whether the stirring is uniform, includes: Measurement points were set at the top, middle, and bottom of the container to obtain detection data; The calculation is performed based on the detection data to obtain the calculation result; The mixing process is judged based on the calculation results to determine whether the mixing is uniform.

[0053] Measurement points were set at the top, middle, and bottom of the container, and an online conductivity meter was installed at each measurement point; at time... Collect spatial variation parameters of conductivity; ; in, This is a parameter representing the spatial variation of electrical conductivity. It is 3; For the first The readings of each measurement point at time t; This represents the spatial mean at any given moment. ; In this embodiment, the online conductivity meter used is the Leici DDS-307A model, with an electrode constant of 1.0 cm. -1 The accuracy is ±0.5%FS. Real-time conductivity values ​​at each measurement point are collected synchronously with a sampling period to determine the reading of the i-th measurement point at time t. That is, the ratio of the standard deviation to the mean of the spatial conductivity at time t. The smaller the value, the more uniform the spatial distribution.

[0054] Calculate the time stability index for a single measurement point within a time window of the past M sampling points; ; in, It is a time stability index; This is the length of the time window, with a value between 15 and 20. The sampling period is 2-5 seconds; the window mean is... ; It reflects the degree of temporal fluctuation in conductivity at a single measurement point.

[0055] Calculate the slope of the linear trend of the time series; obtain it through least squares linear regression.

[0056] ; in, for The mean; Approaching 0 indicates that the mixture is approaching stability; Weighted fusion after conductivity normalization: ; in, Let be the mixing homogeneity index at time t; These are the normalized spatial variation parameters; This is the weighting coefficient corresponding to conductivity; the weight of conductivity is 0.9. To adjust the parameters, a weight of 0.1 is used to penalize signals that are still changing; ; in, Let be the spatial variation parameter of conductivity at time t; This is the parameter representing the minimum spatial variation of conductivity; This is the parameter representing the maximum spatial variation of conductivity.

[0057] When the mixing uniformity index is less than or equal to the first threshold, the slope of the linear trend of the time series is less than or equal to the second threshold, and the duration is greater than or equal to the third threshold, it indicates that the mixing is uniform; otherwise, it indicates that the mixing is uneven.

[0058] The first threshold is 0.05, which needs to be calibrated experimentally; the second threshold is 0.001 μS / (cm·s), which is the slope threshold; the third threshold is 30s, which represents the shortest duration for which the condition is continuously met.

[0059] Method for determining the first threshold: Using the formulation of Example 1 as an example, a liquid fertilizer was prepared.

[0060] Run the online monitoring algorithm and manually take 5 mL samples from the top, middle and bottom of the mixing container every 30 seconds. Use an offline conductivity meter to measure the conductivity values ​​at the three sampling points and calculate the relative standard deviation (RSD) (i.e., offline spatial variation coefficient) of the conductivity values ​​at the three points.

[0061] Define the criteria for manual retesting: when the RSD of the conductivity at three sampling points is ≤ 2%, the mixture is considered to have reached a homogeneous state; record the MUI value output by the algorithm at this time.

[0062] Repeat the above experiment 5 times, record the algorithm MUI value corresponding to the manual determination of uniformity in each batch, take the value and round it up to get 0.05; ensure that the first threshold is slightly higher than the confirmed uniformity MUI value.

[0063] The method for determining the second threshold is as follows: When the absolute value of the time trend slope of conductivity is less than 0.001 μS / (cm·s), within a 30s judgment window, the total drift of conductivity is less than 0.03 μS / cm, which is much less than 0.002% of the typical conductivity value of the product in this embodiment (about 2000-3000 μS / cm), and can be ignored. Therefore, it is considered that the mixing has reached dynamic equilibrium and there is no longer any systematic drift.

[0064] The duration was determined based on the fact that 30 seconds covers at least several sampling periods, which is sufficient to eliminate the false uniformity caused by instantaneous sensor noise or periodic disturbances of the stirring blades.

[0065] Traditional methods rely on operator visual observation or experience to estimate mixing time, resulting in high subjectivity and poor batch-to-batch consistency. This embodiment uses sensor detection data for calculation and mathematical indicators to accurately determine the mixing state. When determining the mixing state, spatial variation parameters, a time stability index, and the slope of the linear trend of the time series are set. The time stability index detects stability in the time direction to prevent transient false uniformity; the slope of the linear trend of the time series detects whether the mean is still drifting, preventing premature judgment before the plateau period and greatly reducing the false judgment rate. The system outputs the current MUI value in each sampling period and feeds the result back to the control system. This allows for automatic increase of stirring speed when the MUI decreases slowly and automatic stopping of stirring when the MUI reaches the target, avoiding energy waste caused by over-stirring. Dimensionless design is used when calculating the spatial variation parameters. The time window mean and the slope of the linear trend of the time series are insensitive to single-point sudden noise; even if there is a brief fluctuation in the sensor during a sampling period, it will not trigger a false judgment. Simultaneously, the duration requirement further filters transient interference, improving the accuracy of judging whether the mixing is uniform, and further improving the accuracy of solution mixing, thus enhancing the efficacy and stability of the liquid fertilizer.

[0066] Thirdly, the present invention also provides the application of the aforementioned hydroponic flower rooting liquid fertilizer in promoting the rooting of hydroponic flowers.

[0067] In one possible implementation, the hydroponic flowers are selected from one or more of the following: pothos, spider plant, pennywort, lucky bamboo, ivy, peace lily, arrowhead vine, monstera, and peperomia.

[0068] In one possible implementation, the liquid fertilizer is diluted with water at a ratio of 800-1500 times, and the resulting diluted solution is used directly as a hydroponic solution. The hydroponic solution is changed every 5 days in the early stage of hydroponics, and then changed every 7 days after new roots grow.

[0069] Experiment 3: Verification of the universality of hydroponic flowers; The formulation of Example 1 was diluted 1000 times to serve as a hydroponic solution. The root-promoting effect of this invention on different hydroponic flowers was investigated. For each flower, 30 cuttings with consistent growth were selected, and 30 cuttings were used as a control group in plain water. The hydroponic conditions were the same as in Experiment 1, as shown in Table 3.

[0070] Table 3 ; Example 1 showed significant root-promoting effects on nine common hydroponic flower varieties, shortening the initial rooting time by 4-10 days compared to the water control, and significantly improving the number of roots and survival rate after 15 days. The liquid fertilizer demonstrated good versatility for various hydroponic flower varieties.

[0071] Experiment 4: The effect of dilution ratio on hydroponic rooting effect; Using the formulation of Example 1 as the stock solution, it was diluted with water at ratios of 500, 800, 1000, 1200, 1500 and 2000, respectively. Using pothos as the test subject, the rooting effect and solution stability at different dilution ratios were investigated, as shown in Table 4.

[0072] Table 4 ; Excellent root-promoting effects can be obtained with dilution ratios ranging from 800 to 1500 times. A 500-fold dilution results in a relatively high concentration, occasionally with trace precipitation and significant pH fluctuations; a 2000-fold dilution results in a relatively low nutrient concentration and a significantly weakened root-promoting effect. Considering both root-promoting effect and cost-effectiveness, a dilution ratio of 800-1500 times is recommended, with 1000 times being optimal.

[0073] Experiment 5: Storage stability test of liquid fertilizer for hydroponic flower rooting; The liquid fertilizers prepared in Example 1, Comparative Examples 6 and 7 were dispensed into 500mL PET bottles and stored in the dark at 25 degrees Celsius. Samples were taken periodically to test pH, precipitation and root-promoting effect, as shown in Table 5.

[0074] Table 5 ; In Example 1 of this invention, after storage at 25°C for 6 months, the pH only decreased from 6 to 5.7, with no precipitation or stratification. The root-promoting effect decreased from 18.6 roots / 15 days to 18.2 roots / 15 days, demonstrating excellent storage stability. Comparative Example 6, lacking the chelating stabilizing effect of citric acid, experienced a continuous decrease in pH and an increasing amount of calcium and phosphorus precipitation with prolonged storage time. Significant precipitation appeared after 6 months, and the root-promoting effect decreased to 10.5 roots / 15 days. Comparative Example 7 exhibited similar problems. The pre-acidification-liquid separation-rate-controlled mixing process of this invention is crucial for product storage stability. The use of citric acid and the stepwise mixing process is not merely a simple process choice, but a necessary technical feature to ensure long-term product stability.

[0075] Experiment 6: Based on the formulation of Example 1, the effects of pre-acidification treatment, A / B liquid mixing rate and stirring speed on the performance of the final product were investigated, as shown in Table 6.

[0076] Table 6 ; Pre-acidification treatment significantly reduced initial precipitation. Without pre-acidification, the precipitation amount was as high as 168 mg / L, while with pre-acidification, it was reduced to less than 1 mg / L. The mixing rate of solutions A and B had a significant impact on the amount of precipitation. When mixing at a controlled rate of 8 mL / min, there was almost no precipitation, while when mixing rapidly at 30 mL / min, the precipitation amount increased to 42 mg / L. This is because rapid addition led to excessively high local calcium ion concentrations, which reacted with phosphate ions to form calcium phosphate precipitate. Insufficient mixing at too low a stirring speed (100 rpm) also led to an increase in precipitation. The precipitation amount in Comparative Example 7 was as high as 285 mg / L, indicating that separation and preparation is a key process step in reducing precipitation.

[0077] Application Example 1: Rooting of pothos in water; The liquid fertilizer prepared in Example 1 was diluted with tap water at a ratio of 1000 to prepare the hydroponic solution. Uniformly growing pothos cuttings (retaining 2 stem nodes and 1 leaf) were selected, and the base of the stem was immersed in the diluted solution. Hydroponic conditions: temperature 25 ± 2 degrees Celsius, relative humidity 70 ± 5%, diffused light. The hydroponic solution was changed every 5 days during the initial stage of hydroponics. White root tips were observed on the 5th day, roots reached 1.5 cm in length on the 7th day, and more than 18 roots with a length of more than 6 cm were produced by the 15th day, achieving a survival rate of 98%.

[0078] Application Example 2: Rooting of Lucky Bamboo in Water; The liquid fertilizer prepared in Example 1 was diluted with tap water at a ratio of 1000 to prepare the hydroponic solution. Stem segments of lucky bamboo (retaining 3-4 nodes) were selected, and the base was obliquely cut before immersing in the diluted solution. Hydroponic conditions were the same as above. White root tips were observed on the 4th day, roots reached over 3cm in length on the 10th day, and more than 16 roots were produced on the 15th day, with a survival rate of 97%.

[0079] The beneficial effects of this invention are as follows: It integrates high phosphorus and calcium nutrient supply, synergistic root promotion with dual plant growth regulators (naphthaleneacetic acid and potassium indolebutyrate), stress resistance enhancement with mineral-derived potassium humate, and citric acid chelation stabilization into a single liquid product, achieving a multi-functional integration of root promotion, nutrition, and stabilization, avoiding the risks that users may encounter when mixing products themselves. The synergistic effect of naphthaleneacetic acid and potassium indolebutyrate at a specific ratio (1:1 to 1:2) has been confirmed, with actual root promotion effects exceeding the theoretical sum when used alone. The innovative three-step process of pre-acidification, liquid preparation, and controlled-speed mixing effectively solves the problem of calcium and phosphorus precipitation, exhibiting excellent root promotion effects on common hydroponic flowers, demonstrating strong universality, significantly shortening the rooting cycle of hydroponic flowers, and promoting earlier rooting, thereby accelerating production turnover and increasing the speed of product launch. Simultaneously, the integrated design reduces the cost for users purchasing and using multiple products, simplifies operation, and saves labor. In addition, its high efficiency in promoting root growth and its high safety can significantly improve plant survival rate and product quality, enhance market competitiveness, and make it especially suitable for home gardening and modern hydroponic flower bases, with broad prospects for promotion and economic benefits.

[0080] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A liquid fertilizer for promoting root growth in hydroponically grown flowers, characterized in that: By mass percentage, it comprises the following components: potassium dihydrogen phosphate 8-16%; calcium nitrate 12-18%; mineral-derived potassium humate 2-4%; naphthaleneacetic acid 0.003-0.006%; potassium indolebutyrate 0.003-0.008%; citric acid 0.10-0.20%; the balance being water.

2. The hydroponic flower rooting liquid fertilizer according to claim 1, characterized in that, The mass ratio of naphthaleneacetic acid to potassium indolebutyrate is 1:1 to 1:

2.

3. A method for preparing a liquid fertilizer for promoting rooting of hydroponic flowers as described in any one of claims 1 to 2, characterized in that, include: S1. Pre-acidification: Dissolve the mineral-derived potassium humate separately, add some citric acid for pre-acidification treatment, and adjust the pH value to 5.5-6.5 to obtain the pre-acidification intermediate solution; S2. Separate liquid preparation: Dissolve calcium nitrate separately in the first part of water to prepare solution A; dissolve potassium dihydrogen phosphate, naphthaleneacetic acid, potassium indolebutyrate and the remaining citric acid together in the second part of water to prepare solution B; S3. Speed-controlled mixing: While continuously stirring, slowly pour liquid A into liquid B, then add the pre-acidified intermediate liquid from step S1, and stir until homogeneous; S4. Volume Adjustment: Add water to 100% of the total weight, stir continuously for 20-40 minutes, and adjust the pH value to 5.5-6.5 with potassium carbonate solution; S5. Filtration and filling: The pH-adjusted solution is filtered through a 0.45-micron pore size filter material and then filled to obtain the liquid fertilizer.

4. The method for preparing the hydroponic flower rooting liquid fertilizer according to claim 3, characterized in that, The first portion of water is 1 / 4 to 1 / 3 of the total water volume, and the second portion of water is 1 / 4 to 1 / 3 of the total water volume.

5. The method for preparing the hydroponic flower rooting liquid fertilizer according to claim 3, characterized in that, The rate at which liquid A is poured into liquid B is 5-10 mL / min, and the stirring speed is 200-400 rpm.

6. The method for preparing the hydroponic flower rooting liquid fertilizer according to claim 3, characterized in that, Step S3, determining whether the mixing is uniform, includes: Measurement points were set at the top, middle, and bottom of the container to obtain detection data; The calculation is performed based on the detection data to obtain the calculation result; The mixing process is judged based on the calculation results to determine whether the mixing is uniform.

7. The application of a liquid fertilizer for promoting root growth in hydroponic flowers as described in any one of claims 1 to 2.

8. The application according to claim 7, characterized in that, The hydroponic flowers are selected from one or more of the following: pothos, spider plant, pennywort, lucky bamboo, ivy, peace lily, arrowhead vine, monstera, and peperomia.

9. The application according to claim 7, characterized in that, Dilute the liquid fertilizer with water at a ratio of 800-1500 times, and use the resulting diluted solution directly as a hydroponic solution. Change the hydroponic solution every 5 days in the early stage of hydroponics, and then change it every 7 days after new roots have grown.

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