High-yield and high-efficiency cultivation method for tender tip asparagus tea

Abstract

The invention provides a high-yield and high-efficiency cultivation method for asparagus tender tip tea. Wide-distance double-row Z-shaped field planting is adopted, the number of plants with harvested tender tips is increased by about 56.25% compared with a conventional green asparagus cultivation method, and the dry weight yield is increased by 34.48%. In addition, tender stems are reserved and harvested at the same time, one batch of asparagus tea is harvested, and the tender stems are reserved after the garden is cleaned, so that at least five batches of asparagus tea can be harvested in one year, and the yield is high. The asparagus tender tips harvested by the method are excellent in quality, have beautiful sensory quality and higher nutritional quality, and the beneficial components such as nystose, timosaponin, polyphyllin and glycyl-leucine in the asparagus tender tips are increased by more than two times compared with common tender tip tea without flower buds. Therefore, the method has wide application prospects in the fields of improving the yield and quality of the tender tip asparagus tea and the like.

Description

Technical Field

[0001] The invention belongs to the research field of biological breeding technology, and particularly relates to a high-yield and high-efficiency cultivation method of asparagus tender tip tea. Background Art

[0002] asparagus( Asparagus officinalis L.) belongs to the Asparagus genus of the Asparagaceae family. It is a health-care vegetable that contains biologically active ingredients such as steroidal soaps and flavonoids, and is rich in free amino acids, vitamins, trace elements (selenium, zinc, iron), as well as protein, sugar and other nutrients. Asparagus has physiological effects such as anti-fatigue, anti-tumor, anti-aging, and immunity enhancement. High-quality asparagus tea is a tea substitute made from the tender tips of fresh asparagus using green tea processing technology. Asparagus tea is a new type of tea health substitute developed in China in recent years. It condenses the medical and medicinal value and the nutritional value of asparagus. With the improvement of people's health awareness, asparagus tea has developed rapidly, and its market development prospects are broad. However, the current research on asparagus tea mainly focuses on the preparation process, and there is no report on the high-yield and efficient cultivation technology of asparagus tender tip tea. The existing cultivation technology of asparagus tea has the following problems: (1) There are currently no reports on the cultivation technology of asparagus tea.

[0003] (2) The length of tender stems harvested from ordinary green asparagus cultivation methods is generally about 30 cm, with a small number of stem tips and low yield.

[0004] (3) The thickness of the tender stems harvested by ordinary green asparagus cultivation methods is generally more than 10 mm, and requires slicing and other processing, which is not only labor-intensive, but also has an appearance that is not as good as the tender tips.

[0005] (4) Common green asparagus cultivation methods generally use narrow-spaced single-row planting with low density, resulting in low asparagus tea yield. Summary of the Invention

[0006] In order to solve the main problems currently existing, the present invention provides a high-yield and high-efficiency cultivation method of asparagus shoot tea. Specifically, the present invention includes the following contents.

[0007] A first aspect of the present invention provides a high-yield and high-efficiency cultivation method for asparagus shoot tea, wherein the method comprises: (I) Asparagus seedlings are planted in a wide-spaced double row Z-shaped pattern and are not harvested in the year of planting; (II) In the year after planting, after the asparagus shoots sprout, leave 5-6 shoots in each nest. When the side branches are fully expanded, harvest the first batch of shoots at once. After the shoots are harvested, cut off the above-ground stems and all side branches 50-60 cm above the ground and remove them. (III) After harvesting the second batch of asparagus tips according to step (II), remove the above-ground stems, retain the tender stems of each nest after the asparagus sprouts as mother stems, and keep the mother stems until the middle of the year, leaving the stubble and removing the above-ground stems; (IV) After the new shoots have sprouted and the side branches have fully expanded, the third batch of asparagus shoots are harvested at once, and the shoots that have sprouted from the stubble are harvested at the same time. After the harvesting is completed, the above-ground stems are removed. After the new shoots sprout, the shoots in each nest are retained as mother stems. The mother stems are kept until the end of the year, and the above-ground stems are removed. (V) In the third year after transplanting and thereafter, after the fourth batch of asparagus tips are harvested according to the steps in (II), the above-ground stems are removed. In early to mid-May, new stems are allowed to sprout and then retained as mother stems. The mother stems are kept until autumn, with the stubble left and the above-ground stems removed. After the new stems sprout and the side branches are fully unfolded, the fifth batch of asparagus tips are harvested at once, and the tips that emerge from the stubble are also harvested. After harvesting is completed, all above-ground stems are removed.

[0008] In certain embodiments, the high-yield and high-efficiency cultivation method of asparagus tea according to the present invention further comprises: (VI) After new tender stems sprout, each nest of tender stems will be used as mother stems. The mother stems will be kept until the end of the year. When the aboveground stems turn yellow, remove the aboveground parts and apply organic fertilizer, urea and compound fertilizer.

[0009] In certain embodiments, according to the high-yield and high-efficiency cultivation method of asparagus shoot tea of the present invention, in step (I), the planting row spacing is 20-200 cm, and the plant spacing is 10-30 cm, preferably the planting row spacing is 180-250 cm, and the plant spacing is 20-30 cm.

[0010] In certain embodiments, according to the high-yield and high-efficiency cultivation method of asparagus shoot tea of the present invention, steps (II) to (V) further include the step of applying organic fertilizer, urea and compound fertilizer.

[0011] In certain embodiments, according to the high-yield and high-efficiency cultivation method of asparagus shoot tea of the present invention, in step (II), in the year after planting, 5-6 asparagus shoots are left in each nest after germination, and the shoots are harvested at one time after all the side branches are unfolded. After the shoots are harvested, the above-ground stems and all side branches are cut off 50-60 cm above the ground.

[0012] In certain embodiments, according to the high-yield and high-efficiency cultivation method of asparagus shoot tea of the present invention, in step (III), after the second batch of asparagus shoots are harvested, the above-ground stems are removed, and after the asparagus sprouts, 3-4 shoots are left in each nest as mother stems, and the mother stems are kept until mid-August, leaving a stubble of 20-30 cm and removing the above-ground stems.

[0013] In certain embodiments, according to the high-yield and high-efficiency cultivation method of asparagus shoot tea of the present invention, in step (IV), after the new shoots sprout and the side branches are fully unfolded 6-8 days later, the third batch of asparagus shoots are harvested at one time, and the shoots sprouted from the stubble are also harvested. After the harvesting is completed, the above-ground stems are removed, and after the new shoots sprout, 5-6 shoots are left in each nest as mother stems. The mother stems are kept until December, and the above-ground stems are removed.

[0014] In certain embodiments, according to the high-yield and high-efficiency cultivation method of asparagus shoot tea of the present invention, in step (V), after the fourth batch of asparagus shoots are harvested according to method (II) in the third year of planting and thereafter, the above-ground stems are removed. In early May, after the new shoots sprout, 3-4 shoots are left in each nest as mother stems. The mother stems are kept until late August, and the above-ground stems are removed after leaving 20-30 cm stubble. Organic fertilizer, urea and compound fertilizer are applied topdressing. When the new shoots sprout and the side branches are fully unfolded, the fifth batch of asparagus shoots are harvested at one time, and the shoots sprouted from the stubble are harvested at the same time. After the harvesting is completed, all the above-ground stems are removed.

[0015] In certain embodiments, according to the high-yield and high-efficiency cultivation method of asparagus shoot tea of the present invention, in step (VI), in early September, after the new tender stems germinate, 5-6 tender stems are retained in each nest as mother stems, and the mother stems are retained until December. After the aboveground stems turn yellow, the aboveground parts are removed, and organic fertilizer, urea and compound fertilizer are applied as topdressing.

[0016] The second aspect of the present invention provides the use of the method described in the first aspect in improving the yield, appearance value and nutritional content of asparagus tea.

[0017] The technical effects of the present invention include but are not limited to: (1) The present invention simultaneously harvests the asparagus while retaining the tender stems. After harvesting one batch, the garden is cleaned and the tender stems are retained. At least five batches of asparagus tea can be harvested in a year, resulting in a high yield. The present invention fills a gap in the efficient cultivation technology of asparagus tea and is completely different from conventional green asparagus cultivation methods.

[0018] (2) The diameter of the asparagus tips harvested by the present invention is approximately 1-3 mm, with excellent quality and beautiful appearance. Slicing is not required for making asparagus tea. Conventional green asparagus cultivation methods harvest asparagus tips with a diameter of 10 mm or more, requiring slicing, which is unsightly and labor-intensive.

[0019] (3) The present invention harvests the tender tips of asparagus with flower buds, which have higher nutritional content, among which the beneficial ingredients such as saccharide, anemarrhena saponin, paridis saponin, and glycine-leucine are increased by more than 2 times.

[0020] (4) The present invention adopts wide-spacing double-row Z-shaped planting, and the number of plants harvested with tender tips increases by about 56.25% compared with the conventional green asparagus cultivation method, and the dry weight yield is increased by 34.48%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 These are the shapes of asparagus stems and tips. A is the asparagus stem, and B is the asparagus tip with bud.

[0022] Figure 2 The figure shows the morphological differences between the asparagus stalk and the asparagus plant after the side branches are expanded. A is the asparagus stalk, and B is the asparagus plant after the side branches are expanded.

[0023] Figure 3 The germination of side branches of asparagus at different stubble heights in spring. A represents asparagus stubble at 20 cm, B represents asparagus stubble at 50 cm, and C represents asparagus stubble at 90 cm.

[0024] Figure 4 The following are the germination of side branches of asparagus at different stubble heights in autumn. A represents asparagus stubble at 20 cm, B represents asparagus stubble at 50 cm, and C represents asparagus stubble at 90 cm.

[0025] Figure 5 The growth of asparagus at different planting densities: A is a 6-meter-wide greenhouse with 4 boxes and 4 rows of asparagus; B is a 6-meter-wide greenhouse with 3 boxes and 6 rows of asparagus.

[0026] Figure 6 This study aimed to analyze the differences in nutritional composition between asparagus stem tips and tender tips. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0028] It should be understood that the terms described in the present invention are only for describing particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges in the present invention, it should be understood that the upper and lower limits of the ranges and each intermediate value therebetween are specifically disclosed. Each smaller range between any stated value or intermediate value within a stated range and any other stated value or intermediate value within the stated range is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0029] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0030] High-yield and high-efficiency cultivation method of asparagus tender tip tea In the method of the present invention, the asparagus variety is not particularly limited, and any asparagus variety with more branches can be used as the material of the present invention. First, adopt wide-spaced double-row Z-shaped planting, and do not harvest the asparagus tips in the year of planting. In the second year, after the asparagus tender stems germinate, leave 5-6 roots in each nest, and harvest the tender tips at one time after the side branches are fully unfolded and flower buds appear. After the tender tips are harvested, cut off the above-ground stems and all side branches 50-60 cm above the ground, and apply topdressing. After harvesting 2 batches of spring tender tip tea, leave 3-4 mother stems in each nest, and keep the mother stems until mid-August. Remove the above-ground stems, leave 20-30 cm stubble, clean the garden, and apply topdressing. Harvest 1 batch of autumn tender tip tea, and at the same time harvest the tender tips that emerge from the stubble, clean the garden, leave the autumn mother stems, remove the above-ground stems in December, and apply topdressing. In the third year after planting, after harvesting the fourth batch of spring asparagus tips, the garden is cleaned, topdressed with fertilizer, and the mother stems are retained. The mother stems are left until late August, leaving 20-30 cm of stubble, then the garden is cleaned and topdressed with fertilizer. Wait until new stems sprout, and after 6-8 days, when all side branches are fully expanded, the fifth batch of asparagus tips are harvested at once, and the tips that emerge from the stubble are also harvested. After harvesting, the garden is cleaned. In early September, the autumn mother stems are retained, and in December, the above-ground stems are removed and topdressed with fertilizer. Using the method of the present invention, three batches of asparagus tips and two batches of tips emerging from the stubble can be harvested in the second year after planting asparagus tea; and five batches of asparagus tips and two batches of tips emerging from the stubble can be harvested in the third year after planting. This high-yield and high-efficiency cultivation method for asparagus tips can increase dry weight yield by 34.48%, improve appearance value, and nutrient content.

[0031] In a preferred embodiment, the high-yield and high-efficiency cultivation method of the asparagus shoot tea of the present invention comprises: 1) Use asparagus varieties with more branches and more concentrated stem growth time as materials.

[0032] 2) When growing in a 6-meter-wide greenhouse, plant asparagus seedlings in a Z-shaped pattern in pairs, with a row spacing of 200 cm and a plant spacing of 20 cm. Plant 3,000-3,300 plants per mu. When growing in an 8-meter-wide greenhouse or in the open field, plant two plants in a V-shaped pattern in pairs, with a row spacing of 200 cm and a plant spacing of 20 cm. Plant 3,200-3,400 plants per mu. Do not harvest the asparagus tips in the year of planting.

[0033] 3) In the second year, after the asparagus shoots sprout, keep 5-7 shoots in each nest. After 10-15 days, when all the side branches are unfolded and flower buds appear, harvest the 5-6 cm tender tips at one time.

[0034] 4) After harvesting the tender tips, cut off the above-ground stems and all side branches 50-60 cm above the ground and remove them from the asparagus field. Apply 10-20 kg / mu of urea and 10-15 kg / mu of NPK compound fertilizer. Fertilize by digging a 10-15 cm deep furrow 20-30 cm from the plants, along the direction of the planting row. Cover with soil and water thoroughly.

[0035] 5) Do not water the asparagus from the time the tender stems sprout until the asparagus tea is harvested to control the number of underground bulbils that sprout.

[0036] 6) After harvesting the second batch of asparagus tips using the methods in 3-4 above, remove the aboveground stems. After the asparagus sprouts, leave 3-4 shoots with a diameter of 1.2-1.5 cm per nest as mother shoots. Keep the mother shoots until mid-August, leaving 20-30 cm of stubble and removing the aboveground stems. Apply 300-400 kg / mu of organic fertilizer, 10-20 kg / mu of urea, and 10-15 kg / mu of NPK compound fertilizer. Wait until new shoots sprout, and after 6-8 days, when the side branches have fully expanded, harvest the third batch of asparagus tips all at once, also harvesting the shoots that have emerged from the stubble. After harvesting, remove the aboveground stems. After the new tender stems sprout, keep 5-6 tender stems with a diameter of 1.2-1.5 cm in each nest as mother stems. Keep the mother stems until December, remove the above-ground stems, and apply 500-600 kg / mu of organic fertilizer and 40-60 kg / mu of NPK compound fertilizer.

[0037] 7) In the third year of planting and thereafter, after harvesting the fourth batch of asparagus tips according to methods (3)-(4), remove the aboveground stems. In early to mid-May, after the new stems sprout, leave 3-4 stems with a diameter of 1.2-1.5 cm in each nest as mother stems. Keep the mother stems until late August, leaving 20-30 cm of stubble and remove the aboveground stems. Apply 300-400 kg / mu of organic fertilizer, 10-20 kg / mu of urea, and 10-15 kg / mu of NPK compound fertilizer. Wait until the new stems sprout, 6-8 days later, when all the side branches are unfolded, harvest the fourth batch of asparagus tips planted in the open field and the fifth batch of asparagus tips planted in the greenhouse at one time, and harvest the tips that sprout from the stubble at the same time. After harvesting, remove all the aboveground stems.

[0038] In early September, after the new tender stems sprout, keep 5-6 tender stems with a diameter of 1.2-1.5 cm in each nest as mother stems. Keep the mother stems until December. After the above-ground stems turn yellow, remove the above-ground parts and apply 500-600 kg / mu of organic fertilizer and 40-60 kg / mu of NPK compound fertilizer.

[0039] application The present invention also provides the use of the above method in improving the yield, appearance value, and nutritional content of asparagus tea. Increasing the nutritional content includes, but is not limited to, increasing the content of hexaose, pentasaccharide, anemarrhena saponins, paridis saponins, and glycyl-leucine.

[0040] Example 1 Three-year-old asparagus varieties "Chuanlu No. 1" and "Apollo" were used as materials and cultivated in greenhouses. The plants were planted in a double-row Z-shape with a row spacing of 2 m and a plant spacing of 0.2 m, and 3,000 nests were planted per mu. After the fourth batch of spring tea was harvested on April 24, the garden was cleared. When clearing the garden, three stubble heights were set, namely 30 cm, 60 cm, and 90 cm. The spring mother stems were retained until August 26, and the garden was cleared. When clearing the garden, three stubble heights were also set. After the new tender stems sprouted, 6 roots were left in each nest. After the side branches were fully unfolded and flower buds appeared, 5-6 cm tender tips were harvested at one time, and the tender tips that emerged from the stubble were also harvested. The fresh weight and dry weight of 20 tender tips were investigated for each treatment, and repeated 3 times.

[0041] The results showed that, despite the same planting methods, there was significant variation in the yield of asparagus tea among different varieties. With 3,000 nests per mu (approximately 6 stems per nest), the fresh weight yield of the fourth-batch spring tea of Chuanlu No. 1 was 514.8 ÷ 60 × 3,000 × 6 = 154,440 g (approximately 308.88 jin) per mu, and the dry weight yield was 70.8 ÷ 60 × 3,000 × 6 = 21,240 g (approximately 42.48 jin) per mu. The fresh weight yield of the fourth-batch spring tea of Apollo was 134,280 g (approximately 268.56 jin) per mu, and the dry weight yield was 18,090 g (approximately 36.36 jin) per mu. The fresh weight per mu of the fourth-batch spring tea of Chuanlu No. 1 was 15.01% higher than that of Apollo, and the dry weight was 16.83% higher. During the autumn tea harvest, the fresh weight yield of Chuanlu No. 1 Autumn Tea was 80,280 g (approximately 160.56 jin) per mu, and the dry weight yield was 11,520 g (approximately 23.04 jin) per mu, while the fresh weight yield of Apollo was 76,500 g (approximately 153.00 jin) per mu, and the dry weight yield was 10,800 g (approximately 21.60 jin) per mu. Chuanlu No. 1 Autumn Tea had a 4.94% higher fresh weight per mu than Apollo, and a 6.67% higher dry weight per mu. Therefore, when choosing asparagus tip tea, choose varieties with more branches and relatively low water content.

[0042] The weight of the harvested asparagus tips varies with the stubble height in different seasons. The weight of the asparagus tips harvested in spring with a stubble of 60 cm is the highest. The fresh weight yield per mu of Chuanlu No. 1 is 153.6÷60×3000×6=46080 g (about 92.16 jin), and the fresh weight yield per mu of Apollo is about 83.16 jin. The most tender stems are harvested in autumn with a stubble of 30 cm. The fresh weight yield per mu of Chuanlu No. 1 is about 42.84 jin, and the fresh weight yield per mu of Apollo is about 39.96 jin. Since the stubble in spring is about 15 days after the stems grow, after the asparagus tips are harvested, the nutrients in the stems are rich ( Figure 3 ), which is conducive to the growth of side branches below 60 cm, while the autumn stubble is left when the stem grows for about 120 days, the nutrients in the stem flow back to the roots, and the nutrients in the stem are less ( Figure 4 ), only a few side branches can germinate and grow below 30 cm. And the height of the stubble left in spring is not the higher the better. The height of the first branch of the asparagus stem is generally below 60 cm, and the side branches above it have already sprouted into branches. Only by removing the top and breaking the top dominance can the side branches below 60 cm that have not sprouted sprout ( Figure 3 ). Therefore, the yield of 90 cm stubble is slightly lower than that of 60 cm stubble. In summary, the suitable stubble height in spring is 50-60 cm, and the suitable stubble height in autumn is 20-30 cm.

[0043] Table 1 Effects of varieties and stubble height on the yield of asparagus tea Example 2 Asparagus cultivar "Chuanlu No. 1" was cultivated in a 6-meter greenhouse. Plants in the treatment group were planted in a double-row, Z-shaped pattern, with 2 m row spacing and 0.2 m plant spacing. Three boxes were planted per greenhouse, totaling 6 rows. 3,000 nests were planted per mu (approximately 1.5 m) of asparagus sprouts were retained in each nest. The control group was planted using conventional green asparagus cultivation methods, with 1.5 m row spacing and 0.25 m plant spacing. Four boxes were planted in single rows, totaling 4 rows, per greenhouse. 1,600 nests were planted per mu (approximately 1.5 m) of asparagus sprouts were retained in each nest. Six asparagus sprouts were retained in each nest. The treatment and control groups each covered 1 mu (approximately 1.0 m). Asparagus tips were not harvested in the year of planting. Yield testing began in the third year of planting. In spring, 5-6 cm tips were harvested 10-15 days after the shoots sprouted, when lateral branches fully expanded and flower buds appeared. After the tips were harvested, they were removed from the asparagus field. Apply 10-20 kg / mu of urea and 10-15 kg / mu of NPK compound fertilizer. Fertilize by digging a 10-15 cm deep furrow 20-30 cm away from the plants, along the direction of the planting row, and apply the fertilizer. Cover with soil and water thoroughly after fertilization. Do not water the asparagus from the time the shoots sprout until the time they are harvested to control the number of underground bulbils. After harvesting the fourth batch of asparagus tips using this method, cut the above-ground stems 50-60 cm below the ground. After harvesting the tips, remove them from the asparagus field. After the asparagus sprouts, retain 3-4 shoots with a diameter of 1.2-1.5 cm per nest as mother stems. Keep the mother stems until mid-August, leaving a 30 cm stubble and removing the above-ground stems. Apply 300-400 kg / mu of organic fertilizer, 10-20 kg / mu of urea, and 10-15 kg / mu of NPK compound fertilizer. In autumn, wait until new shoots sprout. After 6-8 days, when all lateral branches have expanded, harvest the fifth batch of asparagus tips all at once, along with any tips left on the stubble. After harvesting, remove the aboveground stems. After new shoots sprout, retain six shoots with a diameter of 1.2-1.5 cm per nest as mother stems. Keep the mother stems until December, then remove the aboveground stems. Apply 500-600 kg / mu of organic fertilizer or 40-60 kg / mu of NPK compound fertilizer.

[0044] The results showed that the same variety with different planting densities ( Figure 5 ) Significant differences in asparagus tea yields were observed. The treatment group had 3,000 nests per acre, with five stems retained per nest. The control group had 1,600 nests per acre, with six stems retained per nest. At each harvest, the treatment group harvested 5,400 more tender tips per plant than the control group, resulting in a 50.06% increase in total fresh weight yield per acre and a 34.48% increase in dry weight yield.

[0045] Table 2 Asparagus tea yield at different planting densities Example 3 Asparagus cultivar "Chuanlu No. 1" was cultivated in a greenhouse. On March 20th, 30 cm long shoots were harvested using conventional methods, and the top 5 cm of the shoot tip was analyzed for nutrient composition. Using the method of the present invention, 5 cm long tips with flower buds were harvested after the lateral branches of the shoot expanded, and their nutrient composition was analyzed. Liquid chromatography-mass spectrometry (LC-MS / MS) was used to analyze the differences in nutrients between the shoot tip and the shoot tip at the metabolomics level.

[0046] like Figure 6 As shown, the results showed that the nutrient content of tender tips with flower buds was higher than that of tender stem tips, among which the nutrient content of hexaose, pentasaccharide, anemarrhena saponin, paridis saponin, glycine-leucine and other nutrients increased by more than 2 times.

[0047] Therefore, the method can improve the yield and quality of asparagus tip tea and obtain higher economic benefits.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The above embodiments provide a detailed description of the present invention. Any simple modifications, equivalent replacements, and improvements made by those skilled in the art to the above embodiments, without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention, shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-yield and high-efficiency cultivation method for asparagus shoot tea, characterized in that: The method comprises: (I) Asparagus seedlings are planted in a wide-spaced double row Z-shaped pattern, and the tender tips of the asparagus are not harvested in the year of planting; (II) In the year after planting, after the asparagus shoots sprout, leave 5-6 shoots in each nest. When the side branches are fully expanded, harvest the first batch of shoots at once. After harvesting the shoots, cut the stems 50-60 cm above the ground and remove broken branches. (III) After harvesting the second batch of asparagus tips according to the steps in (II), leave no stubble and remove the above-ground stems. After the asparagus sprouts, leave the tender stems in each nest as mother stems. The mother stems are kept until the middle of the year, leaving stubble and removing the above-ground stems. (IV) After the new shoots have sprouted and the side branches have fully expanded, the third batch of asparagus shoots are harvested at once, and the shoots that have sprouted from the stubble are harvested at the same time. After the harvesting is completed, the above-ground stems are removed. After the new shoots sprout, the shoots in each nest are retained as mother stems. The mother stems are kept until the end of the year, and the above-ground stems are removed. (V) In the third year after planting and thereafter, after the fourth batch of asparagus tips are harvested according to the steps in (II), the above-ground stems are removed. After the new shoots sprout, a new shoot is left in each nest as the mother shoot. The mother shoot is kept until autumn, leaving a stubble of 20-30 cm. All broken branches are removed. After the new shoots sprout and the side branches are fully unfolded, the asparagus tips are harvested at one time, and the tips that emerge from the stubble are also harvested. After harvesting, all above-ground parts are removed.

2. The high-yield and high-efficiency cultivation method of asparagus tender tip tea according to claim 1, characterized in that: The method further comprises: (VI) After new tender stems sprout, each nest of tender stems will be used as mother stems. The mother stems will be kept until the end of the year. When the aboveground stems turn yellow, remove the aboveground parts and apply organic fertilizer, urea and compound fertilizer.

3. The high-yield and high-efficiency cultivation method of asparagus tea according to claim 1, characterized in that: In step (I), the planting row spacing is 20-200 cm and the plant spacing is 10-30 cm.

4. The high-yield and high-efficiency cultivation method of asparagus tender tip tea according to claim 1, characterized in that: Steps (II) to (V) further include the step of applying organic fertilizer, urea and compound fertilizer.

5. The high-yield and high-efficiency cultivation method of asparagus tea according to claim 1, characterized in that: In step (II), in the year following planting, after the asparagus shoots sprout, 5-6 shoots are left in each nest. After all the side branches are unfolded, the shoots are harvested at one time. After the shoots are harvested, the above-ground stems and all side branches are cut off 50-60 cm above the ground.

6. The high-yield and high-efficiency cultivation method of asparagus tea according to claim 1, characterized in that: In step (III), after the second batch of asparagus tips are harvested, the above-ground stems are removed. After the asparagus sprouts, 3-4 tender stems are left in each nest as mother stems. The mother stems are kept until mid-August, and the above-ground stems are removed after leaving a stubble of 20-30 cm.

7. The high-yield and high-efficiency cultivation method of asparagus tender tip tea according to claim 1, characterized in that: In step (IV), wait until new tender stems sprout. After 6-8 days, when all the side branches are unfolded, the third batch of asparagus tips are harvested at one time, and the tender tips sprouted from the stubble are harvested at the same time. After the harvesting is completed, the above-ground stems are removed. After the new tender stems sprout, 5-6 tender stems are left in each nest as mother stems. The mother stems are kept until December, and the above-ground stems are removed.

8. The high-yield and high-efficiency cultivation method of asparagus tea according to claim 1, wherein: In step (V), after the fourth batch of asparagus tips are harvested according to method (II) in the third year of planting and thereafter, the above-ground stems are removed. In early May, after the new tender stems sprout, 3-4 tender stems are left in each nest as mother stems. The mother stems are kept until late August, and the above-ground stems are removed after leaving stubble of 20-30 cm. Organic fertilizer, urea and compound fertilizer are applied topdressing. When the new tender stems sprout and the side branches are fully unfolded, the asparagus tips grown in the open field and the fifth batch of asparagus tips grown in the greenhouse are harvested at one time, and the tender tips that emerge from the stubble are harvested at the same time. After the harvesting is completed, all the above-ground stems are removed.

9. The high-yield and high-efficiency cultivation method of asparagus tender tip tea according to claim 2, characterized in that: In step (VI), in early September, after the new tender stems sprout, 5-6 tender stems are left in each nest as mother stems. The mother stems are kept until December. After the aboveground stems turn yellow, the aboveground parts are removed and organic fertilizer, urea and compound fertilizer are applied.

10. Use of the method according to any one of claims 1 to 9 for improving the yield, appearance value and nutritional content of asparagus tea.

Images