A method of fertilizing piper betel

Abstract

The present application relates to the field of agricultural cultivation technology, especially to a fertilization method of Phyllagathis chinensis. The method evenly applies nitrogen, phosphorus and potassium fertilizer in the harvesting period, and sprays zinc fertilizer in the harvesting period, effectively promoting the growth of Phyllagathis chinensis. Further, inorganic fertilizer and organic fertilizer are applied together, which achieves mutual complementation, coordination of urgent and non-urgent, coordinated promotion of growth, and better and more obvious effect.

Description

Technical Field

[0001] This invention relates to the field of agricultural cultivation technology, and in particular to a method for fertilizing pandanus leaves. Background Technology

[0002] Pandanus amaryllifolius Roxb., commonly known as fragrant pandanus leaf, is a perennial herbaceous aromatic plant belonging to the genus Pandanus in the family Pandanaceae. It is also called fragrant pandanus leaf, variegated pandanus leaf, and blood-red pandanus, and is native to Indonesia. It is a fragrant plant in the Pandanaceae family, often called "Oriental herb," ​​with its main characteristic aroma component being 2-acetyl-1-pyrrolidone (2AP). The leaves are also rich in active ingredients such as squalene, linoleic acid, and phytol, which enhance cell vitality, accelerate metabolism, improve immunity, and lower uric acid levels. It is widely used in the food, pharmaceutical, and cosmetic industries, with huge market potential and a very broad application prospect. Pandanus leaves have a low light saturation point (550–600 μmol·m⁻¹). -2 ·s -1 It is shade-tolerant and suitable for planting under tropical economic forests such as areca nut, rubber, and coconut. Pandanus leaves can be harvested after 12 months of planting, and can be harvested 6-8 times a year, with a yield value of over 6,000 yuan per mu. The returns are quick and the economic benefits are significant, making it a superior crop for understory planting. Pandanus leaves have six advantages: easy planting, easy management, easy harvesting, easy processing, good market prospects, and good ecological benefits. With high economic value and benefits for many years from a single planting, it has recently developed into one of the main characteristic industries for enriching the people and revitalizing rural areas in Hainan Province.

[0003] Proper fertilization is crucial for improving the yield and quality of pandanus leaves. However, in production, fertilization of pandanus leaves is often haphazard, with inconsistent amounts and types of fertilizers, primarily relying on chemical fertilizers such as urea and compound fertilizers (15:15:15). This not only leads to low fertilizer utilization and significant fertilizer loss, but also results in uneven nutrient absorption by the pandanus leaves, causing poor growth and quality, severely hindering the sustainable development of the industry. Summary of the Invention

[0004] In view of this, the present invention provides a fertilization method for pandan leaves. This method can effectively promote the growth of pandan leaves, increase the aroma components of pandan leaves, and significantly improve the quality of pandan leaves.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A method for fertilizing pandanus leaves involves applying a mixed fertilizer once within one year of planting the pandanus leaves, and then applying the mixed fertilizer every six months thereafter, and spraying zinc fertilizer during the pandanus leaf harvesting period.

[0007] The mixed fertilizer includes inorganic fertilizer and organic fertilizer, and the inorganic fertilizer includes nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer.

[0008] After years of research, the applicant discovered that applying nitrogen, phosphorus, and potassium fertilizers evenly before harvest and zinc fertilizer during harvest can significantly promote the growth of pandanus leaves and the accumulation of aroma components, ultimately improving the quality of pandanus leaves.

[0009] The application rate of inorganic fertilizers is as follows: nitrogen fertilizer is 13.5-40.5 kg / mu (N), phosphorus fertilizer is 4.5-22.5 kg / mu (P2O5), and potassium fertilizer is 9-27 kg / mu (K2O).

[0010] In some implementation schemes, the ratio of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer in the applied inorganic fertilizer is calculated as N:P2O5:K2O as 13.5:4.5:9, 27:22.5:9 or (27~40.5):(4.5~13.5):(9~27).

[0011] In some specific embodiments, the ratio of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer in the applied inorganic fertilizer is calculated as N:P2O5:K2O as 13.5:4.5:9, 27:4.5:18 or 40.5:4.5:27.

[0012] In the method for fertilizing Panax notoginseng leaves provided by the present invention, the inorganic fertilizer is urea for nitrogen, superphosphate for phosphorus, and potassium sulfate for potassium.

[0013] In other embodiments, the applied mixed fertilizer includes inorganic fertilizer and sheep manure organic fertilizer;

[0014] The application rate of the sheep manure organic fertilizer is 300-700 kg / mu, and the mass ratio of N, P2O5 and K2O in the organic fertilizer is 18.4:17.3:23.5.

[0015] The inorganic fertilizer includes inorganic nitrogen fertilizer and inorganic potassium fertilizer. The application rate of inorganic nitrogen fertilizer is 60-76 kg / mu, and the application rate of inorganic potassium fertilizer is 15.7-36.6 kg / mu.

[0016] In some preferred embodiments, the application rate of the mixed fertilizer is 300 kg / mu for organic fertilizer, 76 kg / mu for inorganic nitrogen fertilizer, and 36.6 kg / mu for inorganic potassium fertilizer.

[0017] In other preferred embodiments, the application rate of organic fertilizer is 700 kg / mu, the application rate of inorganic nitrogen fertilizer is 60 kg / mu, and the application rate of inorganic potassium fertilizer is 15.7 kg / mu.

[0018] Specifically, the inorganic nitrogen fertilizer is urea, and the inorganic potassium fertilizer is potassium sulfate.

[0019] In some implementation schemes, the spraying concentration of the zinc fertilizer, based on the Zn concentration, is 0.2–0.3 g / L. In some specific implementation schemes, the spraying concentration of the zinc fertilizer may be 0.2 g / L, 0.25 g / L, or 0.3 g / L.

[0020] In some implementations, the pandanus leaves are harvested from the 2nd to the 15th year after planting, with 6 to 8 harvests per year.

[0021] Specifically, the leaf harvesting is carried out as follows: during the harvesting period of Panax notoginseng leaves from April to September, harvesting once every 30 to 45 days; and from October to March of the following year, harvesting once every 45 to 60 days.

[0022] The fertilization method for pandanus leaves provided by this invention includes: applying inorganic fertilizer or a mixed fertilizer including inorganic and organic fertilizer before the harvesting period of pandanus leaves, and spraying zinc fertilizer during the harvesting period of pandanus leaves. This method has the following beneficial effects:

[0023] ① Based on the nitrogen, phosphorus, and potassium requirements of Pandanus leaves during their growth and development, a balanced fertilization technique for nitrogen, phosphorus, and potassium is proposed; ② Based on the effects of combining organic and inorganic fertilizers, a combined application scheme for organic and inorganic fertilizers is proposed to achieve mutual benefit, balance the effects of different fertilizers, and coordinate the promotion of Pandanus leaf growth; ③ Based on the effects of micronutrients on the main quality component of Pandanus leaves—aroma components—a zinc fertilizer aroma-enhancing fertilization scheme is proposed to promote the enhancement of Pandanus leaf aroma. Attached Figure Description

[0024] Figure 1 Showing the number of leaves of Pandanus under different fertilization treatments

[0025] Figure 2 The plant height of Panax notoginseng leaves under different fertilization treatments is shown;

[0026] Figure 3 Showing the SPAD values ​​of Panax notoginseng leaves under different fertilization treatments;

[0027] Figure 4 The photosynthetic parameters of *Pueraria lobata* leaves under different fertilization treatments are shown.

[0028] Figure 5 This shows the effect of zinc fertilizer application on the SPAD value of Panax notoginseng leaves;

[0029] Figure 6 This shows the effect of zinc fertilizer application on the photosynthetic rate of Panax notoginseng leaves;

[0030] Figure 7 Heat map showing the content of aroma components in pandanus leaves at different times after zinc fertilizer application;

[0031] Figure 8 The figures show the chlorophyll content of Panax notoginseng leaves at different nitrogen application rates. N0, N1, N2, N3, and N4 represent nitrogen application rates of 0, 0.1, 0.2, 0.3, and 0.4 g per kg of soil, respectively.

[0032] Figure 9 The content of 2-acetyl-1-pyrrole in the leaves of Panax notoginseng under different nitrogen application rates is shown. Detailed Implementation

[0033] This invention provides a method for fertilizing pandanus leaves. Those skilled in the art can refer to this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The method and application of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the method and application described herein without departing from the content, spirit, and scope of this invention to implement and apply the technology of this invention.

[0034] The test materials used in this invention are all common commercial products and can be purchased on the market.

[0035] The present invention will be further illustrated below with reference to the embodiments:

[0036] Example 1

[0037] Based on the nitrogen, phosphorus, and potassium requirements of pandanus leaves and the results of nitrogen fertilizer experiments, 10 different nitrogen, phosphorus, and potassium fertilization treatments were applied to pandanus leaves (see Table 1) to study the effects of different nitrogen, phosphorus, and potassium ratios and application rates on the growth and aroma components of pandanus leaves.

[0038] Based on the application of nitrogen, phosphorus and potassium nutrients, the fertilization technology of combining organic fertilizer with chemical fertilizer was carried out. The types of organic fertilizer, the amount of fertilizer, and the ratio of organic fertilizer with chemical fertilizer were studied. The effects of combining organic fertilizer with chemical fertilizer on soil physicochemical properties, growth of pandanus leaves and aroma components were analyzed, and the optimal fertilization technology for intercropping pandanus leaves under forest was formed.

[0039] During the pandanus leaf harvesting period (leaf can be harvested in the second year after planting), zinc fertilizer was sprayed to reveal the effects of different spraying concentrations and spraying times on the aroma components and leaf color of pandanus leaves.

[0040] Table 1. Nitrogen, phosphorus, and potassium fertilization treatments for Pandanus leaves

[0041]

[0042] (1) Fertilization method

[0043] Methods for applying inorganic fertilizer: In the first month after planting, the first month of the second year, and the seventh month of the second year, inorganic fertilizer was applied once according to the scheme in Table 1. The effects of each fertilization treatment on the growth of Pandanus leaves were investigated on the 10th day and the 70th day after the first fertilization (i.e., the fertilization carried out in the first month after planting).

[0044] (2) Beneficial effects

[0045] ① Comparison of treatments with different nitrogen, phosphorus, and potassium fertilization ratios

[0046] a. Effects of different nitrogen, phosphorus, and potassium fertilization ratios on the number of leaves in Panax notoginseng

[0047] Depend on Figure 1 It was found that 10 days after fertilization, there was no significant difference in the number of leaves among the treatments of Panax notoginseng. With the extension of fertilization time, at 70 days after fertilization, the number of leaves increased with increasing nitrogen application, but the number of leaves decreased with increasing phosphorus application in all treatments. The number of leaves in treatment G7 was significantly higher than in other treatments (except G4), while treatment CK had the fewest leaves and the smallest growth. This indicates that fertilization promotes the growth of Panax notoginseng leaves, while excessive phosphorus fertilizer application inhibits leaf growth. The nitrogen, phosphorus, and potassium fertilization amounts in treatment G7 showed a significant promoting effect.

[0048] b. Effects of different nitrogen, phosphorus, and potassium fertilization ratios on the plant height of Panax notoginseng.

[0049] Depend on Figure 2 It was found that there was no significant difference in plant height among the different treatments 10 days after fertilization. However, as time progressed, after 70 days, the CK treatment showed slower growth compared to the other treatments. The G7, G8, and G9 treatments were significantly taller than the CK treatment, with G7 showing the highest height. The nitrogen fertilizer application rates were consistent across the G7, G8, and G9 treatments, indicating the highest nitrogen application rate among the nine treatments. The plant heights of the G1, G2, G3, G7, G8, and G9 treatments showed a decreasing trend with increasing phosphorus application. This suggests that the combined application of nitrogen, phosphorus, and potassium can promote the growth of pandan leaves. Within a certain range, higher nitrogen application is beneficial for pandan leaf growth, while increased phosphorus application has a certain impact on plant height. The combined application rate in the G7 treatment showed the best effect.

[0050] c. Effects of different nitrogen, phosphorus, and potassium fertilization ratios on SPAD in Panax notoginseng leaves

[0051] Depending on the amount of nitrogen, phosphorus, and potassium fertilizer applied, from Figure 3 It can be seen that 70 days after fertilization, there was no significant difference in SPAD values ​​among most fertilization treatments. Treatments G2 and G7 had the highest SPAD values, with no significant difference between them. Treatments CK and G9 had significantly lower SPAD values ​​than other treatments. This indicates that the combined application of nitrogen, phosphorus, and potassium increased the SPAD value of Aloe vera leaves, but excessive total fertilization will cause a decrease in leaf SPAD values.

[0052] d. Effects of different nitrogen, phosphorus, and potassium fertilization ratios on the photosynthetic characteristics of Panax notoginseng leaves

[0053] Depend on Figure 4 As shown, after 70 days of fertilization, the net photosynthetic rate of treatment G7 was significantly higher than that of other treatments, while the net photosynthetic rates of treatments G1, G2, and G6 were lower than those of the control (CK) treatment. The transpiration rate of treatment G7 was significantly higher than that of treatments G1, G2, G6, and G8, but not significantly different from other treatments. This indicates that the fertilization ratio in treatment G7 can improve the photosynthesis of *Pandanus orchid* leaves, while the fertilization schemes in treatments G1, G2, and G6 reduced the photosynthesis of *Pandanus orchid* leaves.

[0054] e. Effects of different nitrogen, phosphorus, and potassium fertilization ratios on the aroma components and content of Panax notoginseng leaves

[0055] Testing revealed 21 volatile aroma compounds 70 days after the first fertilization, belonging to 10 categories: phenols, alcohols, pyrroles, furans, furanones, acids, lipids, ketones, hydrocarbons, and esters. Table 2 shows that after different fertilization treatments, ethyl linoleate was not detected in the CK-G4 treatment; 18 volatile aroma components were detected in the G4 treatment; 19 in the G1, G2, and G3 treatments; 20 in the CK and G6 treatments; and 21 in the other treatments. Among the different treatments, the content of volatile aroma components in the leaves showed significant differences, except for the content of aldehydes, which did not differ significantly. Under the fertilization levels of G7, G8, and G9 treatments, the content of most volatile aroma components in the leaves of *Panthoceras sorbifolium* was higher than in other treatments, and the content of most aroma components did not differ significantly among the three treatments. Under the G7 treatment, the contents of squalene, o-methoxyphenol, and neophytadiene were the highest, at (682.56±134.86) μg·g, respectively. -1 (15.4±4.29) μg·g -1 (65.11±10.56) μg·g -1 Treatment G8 showed the highest content of 8 volatile aroma components, among which 5 aroma components showed no significant difference from treatment G7. Treatments G7 and G8 had significantly higher 2-acetyl-1-pyrrolidine content than other treatments (except G6). Treatment G7 had a 2AP content of (11.79±0.48) μg·g. -1 G8 treatment (12.18±0.37) μg·g -1 This indicates that the combined application of nitrogen, phosphorus, and potassium has a significant impact on the aroma content of Panax notoginseng leaves, and that a reasonable combination of nitrogen, phosphorus, and potassium can significantly increase the content of various volatile aroma components in the leaves.

[0056] Table 2. Volatile aroma components and contents of Pandanus leaves under different fertilization ratios

[0057]

[0058]

[0059] The results from treatments a, b, c, d, and e indicate that nitrogen, phosphorus, and potassium have significant effects on the growth and aroma components of *Pandanus orchidus* leaves. Treatment G7, with its fertilization rate, promotes leaf growth, enhances photosynthesis, and increases the content of volatile aroma components such as 2AP, squalene, and neophytadiene in the leaves. Specifically, the optimal application rates of N, P2O5, and K2O are 40.5, 4.5, and 27 kg / mu, respectively, with a suitable N:P:K ratio of 9:1:6. This translates to approximately 88 kg / mu of urea (46% N), 37.5 kg / mu of superphosphate (12% P2O5), and 60 kg / mu of potassium sulfate (45% K2O).

[0060] Example 2: Application method of the organic-inorganic mixed fertilizer of the present invention

[0061] ① The effect of different fertilization schemes on the growth of Pandanus leaves

[0062] In this embodiment, the inorganic fertilizer used was urea (46% N), the phosphate fertilizer was superphosphate (12% P2O5), the potassium fertilizer was a mixture of potassium sulfate (45% K2O), and the organic fertilizer was commercial sheep manure organic fertilizer (N: 18.4 g / kg; P2O5: 17.3 g / kg; K2O: 23.5 g / kg), purchased from a biological company in Hebei.

[0063] Method for applying inorganic-organic mixed fertilizer: In the first month after planting the Pandanus leaves, apply the mixed fertilizer for the first time according to the scheme in Table 3, and then apply it once every six months thereafter; Start spraying zinc fertilizer in the first month of the second year after planting the Pandanus leaves, and spray the zinc fertilizer according to the scheme in Table 5, and spray 6 to 8 times a year (spray once every 30 to 45 days from April to September; spray once every 45 to 60 days from October to March of the following year).

[0064] Leaves of Panax notoginseng were collected 10 days and 70 days after the first application of inorganic fertilizer to investigate the effects of different treatments on the number of leaves, plant height, and SPAD value of leaves.

[0065] The experimental design is shown in Table 3 below:

[0066] Table 3. Experimental treatments for organic-inorganic fertilizer ratio.

[0067]

[0068] a. Effect of organic-inorganic fertilizer ratio on the number of leaves in Pansy

[0069] Table 4 shows that 10 days after the combined application of organic and inorganic fertilizers, there was no significant difference in the number of leaves among the different treatments of *Pandanus orchid*. However, with the extension of fertilization time, at 70 days post-treatment, certain differences emerged in the number of leaves among the four different organic-inorganic fertilizer ratios. The CO2 treatment showed significantly higher numbers than the CF and OM treatments. There were no significant differences between the CO1 and CO2 treatments. This indicates that the combined application of organic and inorganic fertilizers increases the number of leaves in *Pandanus orchid*.

[0070] Table 4. Differences in leaf growth among Pandanus orchids with varying ratios of organic and inorganic fertilizers.

[0071]

[0072] b. Effects of organic-inorganic fertilizer ratio on the plant height of Panax notoginseng

[0073] Table 4 shows that 10 days after the application of organic and inorganic fertilizers, there was no significant difference in plant height among the different treatments of Panax notoginseng. However, with the extension of fertilization time, at 70 days post-treatment, the plant heights of the four different organic-inorganic fertilizer ratios showed some differences, with the CO2 treatment being significantly taller than the OM treatment. The CO1 and CO2 treatments were slightly taller than the CF treatment, but the differences were not significant. This indicates that the combined application of organic and inorganic fertilizers promotes the growth of Panax notoginseng leaves.

[0074] c. Effect of organic-inorganic fertilizer ratio on SPAD value of Panax notoginseng leaves

[0075] Table 4 shows that 10 days after the combined application of organic and inorganic fertilizers, there was no significant difference in SPAD values ​​of Panax notoginseng leaves among the treatments. However, with the extension of fertilization time, at 70 days after treatment, the SPAD values ​​of leaves from the four different organic-inorganic fertilizer ratios showed significant differences. The CO2 treatment was significantly higher than the other treatments, and the CO1 and CO2 treatments were significantly higher than the CF and OM treatments. This indicates that the combined application of organic and inorganic fertilizers helps Panax notoginseng leaves accumulate chlorophyll and promotes growth.

[0076] Based on results a, b, and c, it can be concluded that the combined application of organic and inorganic fertilizers promotes the growth of Panax notoginseng leaves. Specifically, both combination 1 (300 kg / mu organic fertilizer + 76 kg / mu urea + 36.6 kg / mu potassium sulfate) and combination 2 (700 kg / mu organic fertilizer + 60 kg / mu urea + 15.7 kg / mu potassium sulfate) can promote Panax notoginseng leaf growth. Considering overall cost, the combination of 300 kg / mu organic fertilizer + 76 kg / mu urea + 36.6 kg / mu potassium sulfate is the most suitable.

[0077] ② The effect of zinc fertilizer spraying on the leaf growth of Pandanus orchids

[0078] During the pandanus leaf harvesting period (leaf harvesting can begin in the second year after planting), specifically in the first month of the second year after planting, zinc fertilizer was sprayed at four different concentrations: 0, 0.2 g Zn / L, 0.25 g Zn / L, and 0.3 g Zn / L. Relevant indicators were measured 10, 20, and 30 days after spraying.

[0079] a. The effect of zinc fertilizer application on the SPAD value of Panax notoginseng leaves

[0080] like Figure 5 As shown, spraying zinc fertilizer increased the SPAD value of Panax notoginseng leaves, with the SPAD value at a concentration of 0.3 g Zn / L being higher than other treatments. The SPAD value initially increased and then decreased with time; the SPAD value after 20 days of spraying was higher than that after 10 and 30 days. At a concentration of 0.3 g Zn / L, the SPAD value did not change significantly with time after spraying.

[0081] b. The effect of zinc fertilizer application on photosynthesis in Panax notoginseng leaves

[0082] like Figure 6 As shown, the photosynthetic rate of *Panthoceras sorbifolium* leaves increased with increasing zinc fertilizer concentration after spraying, with the photosynthetic rate at a concentration of 0.3 g Zn / L being higher than other treatments. At concentrations of 0 and 0.2 g Zn / L, the photosynthetic rate first increased and then decreased with the duration of spraying; at a concentration of 0.25 g Zn / L, the photosynthetic rate reached its peak at 20 days and then remained relatively stable; at a concentration of 0.3 g Zn / L, the photosynthetic rate continued to increase with the duration of spraying.

[0083] c. The effect of zinc fertilizer application on the aroma components of Panax notoginseng leaves

[0084] like Figure 7 As shown, the content of aroma components in pandanus leaves increased after spraying with zinc fertilizer. The highest aroma component contents were observed at concentrations of 0.25 g Zn / L and 0.3 g Zn / L. A thermographic analysis of the aroma component contents at different time points after spraying revealed the highest content 20 days after spraying.

[0085] Table 5. Volatile aroma components and contents of Panax notoginseng leaves under zinc treatment

[0086]

[0087] The results from a, b, and c indicate that foliar spraying of zinc fertilizer promotes growth, increases photosynthetic rate, and enhances the content of aroma components. Higher concentrations were observed 20 days after spraying at concentrations of 0.25 g Zn / L or 0.3 g Zn / L. Therefore, in production, zinc fertilizer can be sprayed 20 days before leaf cutting at a concentration of 0.25 g Zn / L or 0.3 g Zn / L.

[0088] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for fertilizing pandanus leaves, characterized in that, Apply the mixed fertilizer once in the first month after planting the pandanus leaves, and then apply the same mixed fertilizer once every six months thereafter, and spray zinc fertilizer during the pandanus leaf harvesting period; The mixed fertilizer includes inorganic fertilizer and organic fertilizer, wherein the organic fertilizer is sheep manure organic fertilizer; the application rate of the sheep manure organic fertilizer is 300~700 kg / mu, and the mass ratio of N, P2O5 and K2O in the organic fertilizer is 18.4:17.3:23.5; The inorganic fertilizer includes inorganic nitrogen fertilizer and inorganic potassium fertilizer. The application rate of inorganic nitrogen fertilizer is 60-76 kg / mu, and the application rate of inorganic potassium fertilizer is 15.7-36.6 kg / mu. The zinc fertilizer was sprayed 18 to 22 days before leaf cutting at the harvest time; With Zn + The concentration of the zinc fertilizer used for spraying is 0.2–0.3 g / L.

2. The fertilization method according to claim 1, characterized in that, In the applied mixed fertilizer, the application rate of organic fertilizer is 300 kg / mu, the application rate of inorganic nitrogen fertilizer is 76 kg / mu, and the application rate of inorganic potassium fertilizer is 36.6 kg / mu. Alternatively, the application rate of organic fertilizer is 700 kg / mu, the application rate of inorganic nitrogen fertilizer is 60 kg / mu, and the application rate of inorganic potassium fertilizer is 15.7 kg / mu. The inorganic nitrogen fertilizer is urea, and the inorganic potassium fertilizer is potassium sulfate.

3. A method for fertilizing pandanus leaves, characterized in that, Inorganic fertilizer should be applied once in the first month after planting the Pansy leaves, once in the first month of the second year, and once in the seventh month of the second year. Zinc fertilizer should be sprayed during the Pansy leaf harvesting period. The zinc fertilizer was sprayed 18 to 22 days before leaf cutting at the harvest time; With Zn + The concentration of the zinc fertilizer used for spraying is 0.2–0.3 g / L, as indicated by the concentration meter. The application rate of the inorganic fertilizer is as follows: nitrogen fertilizer is 13.5-40.5 kg / mu (based on N), phosphorus fertilizer is 4.5-22.5 kg / mu (based on P2O5), and potassium fertilizer is 9-27 kg / mu (based on K2O).

4. The fertilization method according to any one of claims 1 to 3, characterized in that, The concentration of the zinc fertilizer used for spraying is 0.25 g / L.

5. The fertilization method according to any one of claims 1 to 3, characterized in that, The pandanus leaves are harvested from the 2nd to the 15th year after planting, with 6 to 8 harvests per year.

6. The fertilization method according to claim 5, characterized in that, The specific leaf harvesting method is as follows: during the harvesting period of Panax notoginseng leaves from April to September, harvest once every 30 to 45 days; from October to March of the following year, harvest once every 45 to 60 days.

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