Nutrient solution for promoting photosynthetic efficiency of polygonatum kingianum under forest, method and application

Abstract

The invention relates to the technical field of traditional Chinese medicine planting, in particular to a nutrient solution and method for promoting the photosynthetic efficiency of under-forest polygonatum kingianum and application, and the nutrient solution comprises a nutrient solution A sprayed on leaf surfaces after seedlings grow uniformly, a nutrient solution B for irrigating roots at the beginning of a full growth period and a nutrient solution C sprayed on leaf surfaces at the beginning of a reproductive growth period. The reasonable application of NAA, IAA, 6-BA, GA3 and SA can promote the relative chlorophyll content (SPAD value) of polygonatum kingianum leaves to be improved by 15.48%, the net photosynthetic rate to be improved by 33.47%, the stomatal conductance to be improved by 12.84%, the transpiration rate to be improved by 7.4% and the water utilization rate to be improved by 23.75%, and the biological yield of single plant tubers can be improved by 29.49% through the implementation of a plant growth regulator, major elements, medium elements, trace elements and alginic acid.

Description

Technical Field

[0001] The invention relates to the technical field of Chinese medicine planting, and in particular to a nutrient solution, method and application for promoting the photosynthetic efficiency of polygonatum cyrtonema under forest. Background Art

[0002] Polygonatum yunnanensis Polygonatum kingianum Coll et Hemsl ) is a perennial herb of the genus Polygonatum in the Liliaceae family. In recent years, with the increase in market demand, the scale of planting has continued to expand in various places, especially the planting of Yunnan polygonatum under the forest. Publication number: CN102652482A, a high-efficiency planting method of Polygonatum cyrtonema under the forest is disclosed; Publication number: CN103283434A, a method for cultivating Polygonatum cyrtonema under bamboo forest is disclosed; Publication number: CN104429549A, a method for simulating the wild planting of Yunnan polygonatum under the forest is disclosed; Publication number: CN103283461A, a simulated wild cultivation process of Polygonatum cyrtonema is announced; Publication number: CN103283440A, a method for planting Polygonatum cyrtonema under bamboo forest is disclosed; Publication number: CN104145658A, a method for interplanting Polygonatum cyrtonema under the forest is disclosed; Publication number: CN107295878A, a method for simulating the wild cultivation of Polygonatum cyrtonema under high-altitude forest is disclosed; Publication number: CN 117530130A, discloses a method for increasing the yield and quality of Polygonatum cyrtonema under forest planting; Publication No.: CN109328939A, discloses a large-scale planting method of organic Polygonatum cyrtonema under artificial pine forest; Publication No.: CN 113197041A, discloses a method for planting Polygonatum cyrtonema under forest; Publication No.: CN105993465A, discloses a method for intercropping Polygonatum cyrtonema under forest.

[0003] The forest economy is an agricultural economy that has been vigorously developed in Yunnan and the country in recent years. As far as Yunnan is concerned, Polygonatum sibiricum is the most suitable forest economic crop for large-scale promotion. It generally has excellent adaptability when planted under the forest. However, the forest density of Polygonatum sibiricum under forest is generally greater than the density that is most suitable for its cultivation, which makes the yield of a single Polygonatum sibiricum planted under forest far less than that planted under shade nets on cultivated land. At the same time, due to insufficient light intensity, the disease resistance of the plants is relatively weak, resulting in a higher incidence of root rot, anthracnose, etc. in forest planting under the same management conditions than in planting under shade nets on cultivated land. Summary of the invention

[0005] The purpose of the present invention is to provide a nutrient solution, method and application for promoting the photosynthetic efficiency of Polygonatum cyrtonema planted under forests in view of the problems existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a nutrient solution for promoting the photosynthetic efficiency of Yunnan Polygonatum cyrtonema planted under forest, including: nutrient solution A sprayed on the leaves after the seedlings emerge, nutrient solution B irrigated at the beginning of the growth peak, and nutrient solution C sprayed on the leaves at the beginning of the reproductive growth;

[0007] The nutrient solution A is composed of 0.2-0.3 mg / L IAA, 0.5-0.8 mg / L NAA, 5.0-6.0 mg / L SA, 2.5-3.0 mg / L ferrous sulfate, 1.0-1.2 g / L ammonium phosphate, 0.6-0.8 g / L calcium nitrate and 1.0-1.5 g / L alginic acid;

[0008] The nutrient solution B consists of 1.0-1.5 mg / L NAA, 2.0-3.0 mg / L IAA, 0.5-0.8 mg / L 6-BA, 0.2-0.4 mg / L GA3, 2.5-3.0 mg / L ferrous sulfate, 3.0-4.0 mg / L boric acid, 8.0-9.0 mg / L zinc sulfate, 21.0-23.0 mg / L manganese sulfate, 0.1-0.2 mg / L sodium molybdate, 1.5-1.8 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L potassium nitrate, 1.0-1.5 g / L potassium dihydrogen sulfate, and 3.0-4.0 g / L alginic acid;

[0009] The nutrient solution C consists of 4.0-5.0 mg / L IAA, 2.0-3.0 mg / L 6-BA, 2.5-3.0 mg / L ferrous sulfate, 3.0-4.0 mg / L boric acid, 8.0-9.0 mg / L zinc sulfate, 21.0-23.0 mg / L manganese sulfate, 0.1-0.2 mg / L sodium molybdate, 1.5-1.8 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L potassium nitrate, 1.0-1.5 g / L potassium dihydrogen sulfate, and 5.0-5.5 g / L alginate.

[0010] Furthermore,

[0011] The nutrient solution A consists of 0.25 mg / L IAA, 0.6 mg / L NAA, 5.5 mg / L SA, 2.7 mg / L ferrous sulfate, 1.1 g / L ammonium phosphate, 0.7 g / L calcium nitrate and 1.3 g / L alginic acid;

[0012] The nutrient solution B consists of 1.3 mg / L NAA, 2.5 mg / L IAA, 0.7 mg / L 6-BA, 0.3 mg / L GA3, 2.7 mg / L ferrous sulfate, 3.5 mg / L boric acid, 8.5 mg / L zinc sulfate, 22.0 mg / L manganese sulfate, 0.15 mg / L sodium molybdate, 1.6 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.1 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.3 g / L potassium nitrate, 1.1 g / L potassium dihydrogen sulfate and 3.5 g / L alginic acid;

[0013] The nutrient solution C consists of 4.5 mg / L IAA, 2.5 mg / L 6-BA, 2.7 mg / L ferrous sulfate, 3.5 mg / L boric acid, 8.5 mg / L zinc sulfate, 22.0 mg / L manganese sulfate, 0.15 mg / L sodium molybdate, 1.7 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.1 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.3 g / L potassium nitrate, 1.1 g / L potassium dihydrogen sulfate and 5.3 g / L alginate.

[0014] The second object of the present invention is to provide a method for promoting the photosynthetic efficiency of Polygonatum cyrtonema under forest, the steps comprising:

[0015] (1) After all seedlings emerge in May, spray nutrient solution A on the leaves at a rate of 40-45 kg / mu;

[0016] (2) In June, when the Yunnan Polygonatum cyrtonema is in its peak growth period, use nutrient solution B for root irrigation at a rate of 200-250 kg / mu, and then irrigate the roots every 10-15 days;

[0017] (3) Starting from the early reproductive growth stage of Polygonatum cyrtonema in August, spray the leaves with nutrient solution C at a rate of 40-45 kg / mu, and then spray every 10-15 days.

[0018] Further, the steps include:

[0019] (1) After all seedlings emerge in May, spray nutrient solution A on the leaves at a rate of 42.5 kg / mu;

[0020] (2) In June, when the Yunnan Polygonatum cyrtonema is in its peak growth period, use nutrient solution B for root irrigation at a rate of 225 kg / mu, and then irrigate the roots every 10 to 15 days;

[0021] (3) Starting from the early reproductive growth stage of Polygonatum cyrtonema in August, nutrient solution C was sprayed on the leaves at a rate of 42.5 kg / mu, and then sprayed every 10 to 15 days.

[0022] The beneficial technical effects of the present invention are:

[0023] 1. The reasonable application of NAA, IAA, 6-BA, GA3 and SA in the present invention can increase the relative chlorophyll content (SPAD value) of Polygonatum cyrtonema leaves by 15.48%, the net photosynthetic rate by 33.47%, the stomatal conductance by 12.84%, the transpiration rate by 7.4%, and the water utilization rate by 23.75%. It is speculated that one or more of the plant growth regulators among NAA, IAA, 6-BA, GA3 and SA are beneficial to improving the transpiration rate and water utilization rate of Polygonatum cyrtonema leaves, increasing the stomatal conductance, promoting chlorophyll synthesis, and thus improving the photosynthetic efficiency. On the one hand, it can increase plant yield, and on the other hand, it can also improve the plant's resistance to diseases, pests and adversity. At the same time, it may also promote the production of secondary metabolites to a certain extent, and as far as Chinese medicinal materials are concerned, it may increase the content of its effective ingredients.

[0024] 2. Forest economy is an agricultural economy that has been vigorously developed in Yunnan and China in recent years. As far as Yunnan is concerned, Yunnan Polygonatum is the most suitable forest economic crop for large-scale promotion. It generally has excellent adaptability when planted under the forest, but the general canopy density of Yunnan Polygonatum under the forest is greater than the canopy density that is most suitable for Yunnan Polygonatum cultivation, which makes the yield of Yunnan Polygonatum under the forest far less than that of planting with shade nets built on cultivated land. At the same time, due to the lack of light intensity, the disease resistance of the plants is relatively weak, resulting in the incidence of root rot, anthracnose, etc. under the same management conditions. The present invention can increase the biological yield of single tubers by 29.49% through the implementation of plant growth regulators, macro, medium and trace elements and alginic acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a diagram of the planting results of Example 4 of the present invention.

[0027] Figure 2 It is a planting result diagram of comparative example 1 of the present invention.

[0028] Figure 3 The figure shows a comparison between plants of Example 1 and Comparative Example 1. The plant of Example 1 on the left has a larger tuber; the plant of Comparative Example 1 on the right has a smaller tuber. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] A nutrient solution for promoting the photosynthetic efficiency of Yunnan polygonatum planted under forests, comprising: a nutrient solution A for spraying on leaves after all seedlings emerge, a nutrient solution B for irrigating roots at the peak growth stage, and a nutrient solution C for spraying on leaves at the early reproductive growth stage;

[0032] Nutrient solution A consisted of 0.25 mg / L IAA, 0.6 mg / L NAA, 5.5 mg / L SA, 2.7 mg / L ferrous sulfate, 1.1 g / L ammonium phosphate, 0.7 g / L calcium nitrate and 1.3 g / L alginate.

[0033] Nutrient solution B consisted of NAA 1.3 mg / L, IAA 2.5 mg / L, 6-BA 0.7 mg / L, GA3 0.3 mg / L, ferrous sulfate 2.7 mg / L, boric acid 3.5 mg / L, zinc sulfate 8.5 mg / L, manganese sulfate 22.0 mg / L, sodium molybdate 0.15 mg / L, ammonium phosphate 1.6 g / L, calcium nitrate 1.1 g / L, ammonium phosphate 1.1 g / L, calcium nitrate 1.1 g / L, potassium nitrate 1.3 g / L, potassium dihydrogen sulfate 1.1 g / L and alginate 3.5 g / L.

[0034] Nutrient solution C consisted of IAA 4.5 mg / L, 6-BA 2.5 mg / L, ferrous sulfate 2.7 mg / L, boric acid 3.5 mg / L, zinc sulfate 8.5 mg / L, manganese sulfate 22.0 mg / L, sodium molybdate 0.15 mg / L, ammonium phosphate 1.7 g / L, calcium nitrate 1.1 g / L, ammonium phosphate 1.1 g / L, calcium nitrate 1.1 g / L, potassium nitrate 1.3 g / L, potassium dihydrogen sulfate 1.1 g / L and alginate 5.3 g / L.

[0035] Example 2

[0036] A nutrient solution for promoting the photosynthetic efficiency of Yunnan polygonatum planted under forests, comprising: a nutrient solution A for spraying on leaves after all seedlings emerge, a nutrient solution B for irrigating roots at the peak growth stage, and a nutrient solution C for spraying on leaves at the early reproductive growth stage;

[0037] Nutrient solution A consisted of 0.2 mg / L IAA, 0.5 mg / L NAA, 5.0 mg / L SA, 2.5 mg / L ferrous sulfate, 1.0 g / L ammonium phosphate, 0.6 g / L calcium nitrate and 1.0 g / L alginate.

[0038] Nutrient solution B consisted of NAA 1.0 mg / L, IAA 2.0 mg / L, 6-BA 0.5 mg / L, GA3 0.2 mg / L, ferrous sulfate 2.5 mg / L, boric acid 3.0 mg / L, zinc sulfate 8.0 mg / L, manganese sulfate 21.0 mg / L, sodium molybdate 0.1 mg / L, ammonium phosphate 1.5 g / L, calcium nitrate 1.0 g / L, ammonium phosphate 1.0 g / L, calcium nitrate 1.0 g / L, potassium nitrate 1.0 g / L, potassium dihydrogen sulfate 1.0 g / L and alginic acid 3.0 g / L;

[0039] Nutrient solution C consisted of IAA 4.0 mg / L, 6-BA 2.0 mg / L, ferrous sulfate 2.5 mg / L, boric acid 3.0 mg / L, zinc sulfate 8.0 mg / L, manganese sulfate 21.0 mg / L, sodium molybdate 0.1 mg / L, ammonium phosphate 1.5 g / L, calcium nitrate 1.0 g / L, ammonium phosphate 1.0 g / L, calcium nitrate 1.0 g / L, potassium nitrate 1.0 g / L, potassium dihydrogen sulfate 1.0 g / L, and alginic acid 5.0 g / L.

[0040] Example 3

[0041] A nutrient solution for promoting the photosynthetic efficiency of Yunnan polygonatum planted under forests, comprising: a nutrient solution A for spraying on leaves after all seedlings emerge, a nutrient solution B for irrigating roots at the peak growth stage, and a nutrient solution C for spraying on leaves at the early reproductive growth stage;

[0042] Nutrient solution A consisted of 0.3 mg / L IAA, 0.8 mg / L NAA, 6.0 mg / L SA, 3.0 mg / L ferrous sulfate, 1.2 g / L ammonium phosphate, 0.8 g / L calcium nitrate and 1.5 g / L alginate.

[0043] Nutrient solution B consisted of NAA 1.5 mg / L, IAA 3.0 mg / L, 6-BA 0.8 mg / L, GA3 0.4 mg / L, ferrous sulfate 3.0 mg / L, boric acid 4.0 mg / L, zinc sulfate 9.0 mg / L, manganese sulfate 23.0 mg / L, sodium molybdate 0.2 mg / L, ammonium phosphate 1.8 g / L, calcium nitrate 1.2 g / L, ammonium phosphate 1.2 g / L, calcium nitrate 1.2 g / L, potassium nitrate 1.5 g / L, potassium dihydrogen sulfate 1.2 g / L and alginic acid 4.0 g / L;

[0044] Nutrient solution C consisted of IAA 5.0 mg / L, 6-BA 3.0 mg / L, ferrous sulfate 3.0 mg / L, boric acid 4.0 mg / L, zinc sulfate 9.0 mg / L, manganese sulfate 23.0 mg / L, sodium molybdate 0.2 mg / L, ammonium phosphate 1.8 g / L, calcium nitrate 1.2 g / L, ammonium phosphate 1.2 g / L, calcium nitrate 1.2 g / L, potassium nitrate 1.5 g / L, potassium dihydrogen sulfate 1.2 g / L, and alginic acid 5.5 g / L.

[0045] Example 4

[0046] A method for promoting the photosynthetic efficiency of Polygonatum cyrtonema under forest, wherein the nutrient solution is the formula in Example 1, and the steps include:

[0047] (1) After all seedlings emerge in May, spray nutrient solution A on the leaves at a rate of 42.5 kg / mu.

[0048] (2) In June, when the growth peak of Polygonatum cyrtonema begins, use nutrient solution B for root irrigation at a rate of 225 kg / mu, and then irrigate the roots every 13 days.

[0049] (3) Starting from the early reproductive growth stage of Polygonatum cyrtonema in August, nutrient solution C was sprayed on the leaves at a rate of 42.5 kg / mu, and then sprayed every 13 days. Figure 1 shown.

[0050] Example 5

[0051] A method for promoting the photosynthetic efficiency of Polygonatum cyrtonema under forest, wherein the nutrient solution is the formula in Example 2, and the steps include:

[0052] (1) After all seedlings emerge in May, spray nutrient solution A on the leaves at a rate of 40 kg / mu.

[0053] (2) In June, when the growth peak of Polygonatum cyrtonema begins, use nutrient solution B for root irrigation at a rate of 200 kg / mu, and then irrigate the roots every 10 days.

[0054] (3) Starting from the early reproductive growth stage of Polygonatum cyrtonema in August, nutrient solution C was sprayed on the leaves at a rate of 40 kg / mu, and then sprayed every 10 days.

[0055] Example 6

[0056] A method for promoting the photosynthetic efficiency of Polygonatum cyrtonema under forest, wherein the nutrient solution is the formula in Example 3, and the steps include:

[0057] (1) After all seedlings emerge in May, spray nutrient solution A on the leaves at a rate of 45 kg / mu.

[0058] (2) In June, when the growth peak of Polygonatum cyrtonema begins, use nutrient solution B for root irrigation at a rate of 250 kg / mu, and then irrigate the roots every 15 days.

[0059] (3) Starting from the early reproductive growth stage of Polygonatum cyrtonema in August, nutrient solution C was sprayed on the leaves at a rate of 45 kg / mu, and then sprayed every 15 days.

[0060] Comparative Example 1

[0061] The management was carried out according to step (3) of Example 1 of the patented method for simulating wild planting of polygonatum cyrtonema under forest (CN104429549A). The results were as follows: Figure 2 shown.

[0062] Comparative Example 2

[0063] After all the seedlings emerge in May, nutrient solution A is sprayed on the leaves at a rate of 40-45 kg / mu. Conventional management is then performed. The rest of the management is performed according to step (3) of Example 1 of a patented method for simulating wild planting of Polygonatum cyrtonema under forests (CN104429549A).

[0064] Nutrient solution A consisted of 0.25 mg / L IAA, 0.6 mg / L NAA, 5.5 mg / L SA, 2.7 mg / L ferrous sulfate, 1.1 g / L ammonium phosphate, 0.7 g / L calcium nitrate and 1.3 g / L alginate.

[0065] Comparative Example 3

[0066] At the beginning of the peak growth period of Yunnan polygonatum in June, nutrient solution B was used for root irrigation at a rate of 200-250 kg / mu, and then root irrigation was carried out every 10-15 days until July. Fertilization management was then carried out according to step (3) of Example 1 of a patented method for simulating wild planting of Yunnan polygonatum under forest (CN104429549A).

[0067] Nutrient solution B consists of NAA 1.3 mg / L, IAA 2.5 mg / L, 6-BA 0.7 mg / L, GA3 0.3 mg / L, ferrous sulfate 2.7 mg / L, boric acid 3.5 mg / L, zinc sulfate 8.5 mg / L, manganese sulfate 22.0 mg / L, sodium molybdate 0.15 mg / L, ammonium phosphate 1.6 g / L, calcium nitrate 1.1 g / L, ammonium phosphate 1.1 g / L, calcium nitrate 1.1 g / L, potassium nitrate 1.3 g / L, potassium dihydrogen sulfate 1.1 g / L and alginate 3.5 g / L.

[0068] Comparative Example 4

[0069] Fertilization management was carried out according to step (3) of Example 1 of a patented method for simulating wild cultivation of polygonatum cyrtonema under forest (CN104429549A), and nutrient solution C was sprayed on the leaves starting from the early reproductive growth stage of polygonatum cyrtonema in August, with a spraying amount of 40-45 kg / mu, and then sprayed every 10-15 days.

[0070] Nutrient solution C consisted of IAA 4.5 mg / L, 6-BA 2.5 mg / L, ferrous sulfate 2.7 mg / L, boric acid 3.5 mg / L, zinc sulfate 8.5 mg / L, manganese sulfate 22.0 mg / L, sodium molybdate 0.15 mg / L, ammonium phosphate 1.7 g / L, calcium nitrate 1.1 g / L, ammonium phosphate 1.1 g / L, calcium nitrate 1.1 g / L, potassium nitrate 1.3 g / L, potassium dihydrogen sulfate 1.1 g / L and alginate 5.3 g / L.

[0071] Example 4 Planting results are as follows Figure 1 As shown, the planting results of comparative example 1 are as follows Figure 2 As shown, from Figure 3 It can be seen that the tubers of the plants of Example 1 on the left are larger, while the tubers of the plants of Comparative Example 1 on the right are smaller. The photosynthetic physiological indexes and biomass indexes of Example 1 and Comparative Example 1 were statistically analyzed, and the results are shown in Tables 1 and 2.

[0072] Table 1 Photosynthetic physiological indicators

[0073] deal with <![CDATA[Net photosynthetic rate μmol / m 2 ·s]]> <![CDATA[Stomatal conductance mol / m 2 ·s]]> <![CDATA[Intercellular CO 2 Concentration μmol / m 2 ·s]]> <![CDATA[Transpiration rate mmol / m 2 ·s]]> Blade vapor pressure deficit kPa <![CDATA[Water use efficiency μmol·mol -1 > Relative chlorophyll content Comparative Example 1 7.56±0.06b 0.109±0.003b 270±0.18a 1.89±0.00b 1.41±0.02a 4.00±0.01b 42.00±0.01b Example 4 10.09±0.01a 0.123±0.006a 243±0.07b 2.03±0.01a 1.34±0.01b 4.95±0.00a 48.5±0.00a

[0074] Table 2 Biomass index

[0075] deal with Plant heightcm Stem diameter mm Leaf length cm Leaf width cm Root dry weight (g / plant) Comparative Example 1 67±1.6b 5.2±0.11b 14.6±0.98b 5.1±0.48b 41.03±0.87b Example 4 96.8±1.4a 8.4±0.23a 22.7±1.01c 6.4±0.26a 53.13±0.66a

[0076] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A nutrient solution for promoting the photosynthetic efficiency of Polygonatum cyrtonema under forest, characterized in that: include: Nutrient solution A is sprayed on the leaves after all seedlings emerge, nutrient solution B is used for root irrigation at the peak of growth, and nutrient solution C is sprayed on the leaves at the beginning of reproductive growth; The nutrient solution A is composed of 0.2-0.3 mg / L IAA, 0.5-0.8 mg / L NAA, 5.0-6.0 mg / L SA, 2.5-3.0 mg / L ferrous sulfate, 1.0-1.2 g / L ammonium phosphate, 0.6-0.8 g / L calcium nitrate and 1.0-1.5 g / L alginic acid; The nutrient solution B consists of 1.0-1.5 mg / L NAA, 2.0-3.0 mg / L IAA, 0.5-0.8 mg / L 6-BA, 0.2-0.4 mg / L GA3, 2.5-3.0 mg / L ferrous sulfate, 3.0-4.0 mg / L boric acid, 8.0-9.0 mg / L zinc sulfate, 21.0-23.0 mg / L manganese sulfate, 0.1-0.2 mg / L sodium molybdate, 1.5-1.8 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L potassium nitrate, 1.0-1.5 g / L potassium dihydrogen sulfate, and 3.0-4.0 g / L alginic acid; The nutrient solution C consists of 4.0-5.0 mg / L IAA, 2.0-3.0 mg / L 6-BA, 2.5-3.0 mg / L ferrous sulfate, 3.0-4.0 mg / L boric acid, 8.0-9.0 mg / L zinc sulfate, 21.0-23.0 mg / L manganese sulfate, 0.1-0.2 mg / L sodium molybdate, 1.5-1.8 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L ammonium phosphate, 1.0-1.2 g / L calcium nitrate, 1.0-1.2 g / L potassium nitrate, 1.0-1.5 g / L potassium dihydrogen sulfate, and 5.0-5.5 g / L alginate.

2. The nutrient solution according to claim 1, characterized in that: The nutrient solution A consists of 0.25 mg / L IAA, 0.6 mg / L NAA, 5.5 mg / L SA, 2.7 mg / L ferrous sulfate, 1.1 g / L ammonium phosphate, 0.7 g / L calcium nitrate and 1.3 g / L alginic acid; The nutrient solution B consists of 1.3 mg / L NAA, 2.5 mg / L IAA, 0.7 mg / L 6-BA, 0.3 mg / L GA3, 2.7 mg / L ferrous sulfate, 3.5 mg / L boric acid, 8.5 mg / L zinc sulfate, 22.0 mg / L manganese sulfate, 0.15 mg / L sodium molybdate, 1.6 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.1 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.3 g / L potassium nitrate, 1.1 g / L potassium dihydrogen sulfate and 3.5 g / L alginic acid; The nutrient solution C consists of 4.5 mg / L IAA, 2.5 mg / L 6-BA, 2.7 mg / L ferrous sulfate, 3.5 mg / L boric acid, 8.5 mg / L zinc sulfate, 22.0 mg / L manganese sulfate, 0.15 mg / L sodium molybdate, 1.7 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.1 g / L ammonium phosphate, 1.1 g / L calcium nitrate, 1.3 g / L potassium nitrate, 1.1 g / L potassium dihydrogen sulfate and 5.3 g / L alginate.

3. A method for promoting the photosynthetic efficiency of Polygonatum cyrtonema under forests using the nutrient solution according to claim 1 or 2, characterized in that the steps include: (1) After all seedlings emerge in May, spray nutrient solution A on the leaves at a rate of 40-45 kg / mu; (2) In June, when the Yunnan Polygonatum cyrtonema is in its peak growth period, use nutrient solution B for root irrigation at a rate of 200-250 kg / mu, and then irrigate the roots every 10-15 days; (3) Starting from the early reproductive growth stage of Polygonatum cyrtonema in August, spray the leaves with nutrient solution C at a rate of 40-45 kg / mu, and then spray every 10-15 days.

4. The method according to claim 3, characterized in that the steps include: (1) After all seedlings emerge in May, spray nutrient solution A on the leaves at a rate of 42.5 kg / mu; (2) In June, when the Yunnan Polygonatum cyrtonema is in its peak growth period, use nutrient solution B for root irrigation at a rate of 225 kg / mu, and then irrigate the roots every 10 to 15 days; (3) Starting from the early reproductive growth stage of Polygonatum cyrtonema in August, nutrient solution C was sprayed on the leaves at a rate of 42.5 kg / mu, and then sprayed every 10 to 15 days.

5. Application of the method according to claim 3 or 4 in planting Polygonatum cyrtonema under forest.

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