Method for cultivating asparagus mother stems in cooperation with plant type shaping of population and application of method for cultivating asparagus mother stems in cooperation with plant type shaping of population

Abstract

The invention discloses a method for cultivating asparagus mother stems in cooperation with plant type shaping of a group and application. The method comprises the following steps: keeping a proper mother stem spacing distance; the mother stems are trimmed, so that branches between two rows of plants form an arch shape, the illumination intensity and the photosynthetic rate are improved, and field operation is facilitated when the mother stems are reserved for bamboo shoot harvesting; the mother stems are subjected to light insect supplementing and water and fertilizer management, so that the illumination intensity and the photosynthetic rate are enhanced, pests are effectively repelled, plant stems are prevented from cracking, and diseases are reduced; and carrying out fertilizer emasculation treatment on the plants in the initial flowering stage to prevent the female plants from fruiting, promote the plant growth and improve the yield. The method has wide application prospects in the fields of improving the quality of asparagus mother stems and / or the yield of asparagus and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of asparagus cultivation, and particularly relates to a method and application of asparagus mother stem retention and collaborative group plant shape shaping. Background Art

[0002] Asparagus is a perennial herbaceous plant belonging to the genus Asparagus of the family Asparagaceae. It uses tender stems as its product organ. The tender stems are formed by the germination of bulbils on the underground stems. The quantity and quality of bulbils depend on the nutrients supplied by the underground storage roots. The more sufficient the nutrient supply, the more bulbils will be formed. The formation of tender stems is completely dependent on the photosynthesis of the stems and leaves in the previous year, which synthesizes and operates the photosynthetic assimilates stored in the storage roots. Therefore, the factors that affect the yield of asparagus are mainly the quality of the aboveground mother stems, especially the photosynthesis to produce nutrients, which are then transported to the underground storage roots. The more storage roots there are, the larger the underground stems are, and the stronger the mother stems are, the higher the yield of the plant. Therefore, the quality of the mother stems determines the yield of asparagus.

[0003] The main problems in current cultivation technology are as follows: inappropriate spacing between mother stems; lack of mother stem pruning technology; lack of measures to supplement light and repel insects on mother stems; improper water and fertilizer management of mother stems; and a large number of mother stems causing nutrient waste, thereby reducing the yield of tender stems.

[0004] Therefore, there is still a need for a cultivation technology that can improve the quality of asparagus mother stems and asparagus yield. Summary of the invention

[0005] In order to solve at least some of the technical problems in the above-mentioned prior art, the present invention improves the quality of asparagus mother stems and the yield of asparagus by maintaining an appropriate distance between mother stems, pruning the mother stems in a certain manner, supplementing light and repelling insects, managing water and fertilizer for the mother stems, and taking measures to prevent the female plants from bearing fruit. Specifically, the present invention includes the following contents.

[0006] A first aspect of the present invention provides a method for maintaining mother asparagus stems and coordinating plant shape of the asparagus population, comprising:

[0007] (1) Maintain appropriate distance between mother stems;

[0008] (2) Pruning the mother stem: After the branches and leaves of the mother stem are fully expanded, prune the mother stem according to the formula Y = -0.015x 2 +94 for pruning, where Y represents the plant height, and x represents the distance between the outer branches and leaves close to each other in two rows, 30cm≤Y≤80cm;

[0009] (3) supplementing light, repelling insects, and managing water and fertilizer on the mother stem;

[0010] (4) Apply fertilizer to suppress male sex in early flowering stage to prevent female plants from bearing fruit.

[0011] In certain embodiments, according to the method for retaining asparagus mother stems for coordinated plant shape shaping of a population, in step (1), the spacing between the two-year-old asparagus mother stems is greater than 2 cm.

[0012] In certain embodiments, according to the method for retaining asparagus mother stems for coordinated plant shape shaping of the asparagus population described in the present invention, in step (1), the distance between the asparagus mother stems of three years old and above is more than 3 cm.

[0013] In certain embodiments, according to the method for collaborative plant shaping of asparagus colonies by retaining mother stems of the present invention, in step (3), the light supplement and insect repellent includes laying a reflective film under the mother stems.

[0014] In certain embodiments, according to the method for collaborative plant shaping of asparagus populations by retaining mother stems of asparagus according to the present invention, the distance between the reflective film and the mother stems is 6-8 cm, and the width of the reflective film is 20-30 cm.

[0015] In certain embodiments, in the method for collaborative plant shape shaping of asparagus population by retaining mother stems according to the present invention, the water and fertilizer management includes: applying organic fertilizer and high-potassium compound fertilizer before retaining the mother stems, and maintaining the soil water holding capacity at 60-70% during the period of retaining the mother stems.

[0016] In certain embodiments, according to the method for retaining asparagus mother stems and coordinating plant shape of the asparagus population as described in the present invention, a small ditch is opened 15-25 cm away from the planting row before retaining the mother stems, 150-250 kilograms of organic fertilizer and 5-15 kilograms of high-potassium compound fertilizer are applied per mu, and the stems are sprayed with 5-10% wood ash extract before, during and after the side branches of the mother stems unfold.

[0017] In certain embodiments, according to the method for retaining asparagus mother stems and coordinating plant shape of a population, the plants are sprayed with 1-6% urea and 1-5‰ potassium dihydrogen phosphate during the early flowering stage.

[0018] In certain embodiments, according to the method for retaining asparagus mother stems and coordinating plant shape shaping of the population as described in the present invention, the spraying is performed once every 4-8 days, for 2-4 consecutive times, and before 9 o'clock every day.

[0019] A second aspect of the present invention provides use of the method according to the present invention in improving the quality of asparagus mother stems and / or asparagus yield.

[0020] The present invention has the following beneficial effects:

[0021] (1) The present invention maintains an appropriate distance between mother stems, thereby achieving the purpose of enhancing the light intensity between asparagus mother stems, improving the photosynthetic rate, increasing the storage amount of mother stem photosynthetic products in the root system, and reducing the occurrence of diseases.

[0022] (2) According to the pruning method of the present invention, the branches between two rows of plants form an arch after pruning. When the plant is 40 cm high, the distance between the branches and leaves of the two rows is about 60 cm; when the plant is 70 cm high, the distance between the branches and leaves of the two rows is about 40 cm. This is not only convenient for field operation when the mother stem is left to pick bamboo shoots, but also has good ventilation and light transmission effects for the plants, reduces labor costs, enhances the light intensity of the branches and leaves of the plants, and improves the photosynthetic rate. This avoids the problems in the prior art of reducing the nutrients produced by photosynthesis of the plants due to excessive pruning, and at the same time, the apical dominance is broken, and it is easy to generate new axillary buds and cause nutrient waste.

[0023] (3) The present invention lays a reflective film under the mother stem when the leaves and branches of the mother stem begin to unfold, thereby enhancing the light intensity and photosynthetic rate. This solves the problem of insufficient light caused by long-term rainy weather and the shading of the plant itself, especially the lower leaves and branches, which causes a decrease in photosynthetic rate, reduces the storage of photosynthetic products of the mother stem in the root system, and reduces the asparagus yield. At the same time, the reflective film can reflect light, thereby preventing pests such as aphids from approaching the crop.

[0024] (4) The present invention applies organic fertilizer and high potassium compound fertilizer before leaving the mother stem. The soil water holding capacity is maintained at 60-70% during the period of leaving the mother stem, following the principle of "small amount and multiple times". At the same time, before, during and after the mother stem and its side branches unfold, 5-10% plant ash extract is sprayed respectively to avoid cracks in the plant stems and reduce diseases.

[0025] (5) The present invention sprays urea and potassium dihydrogen phosphate at the initial flowering stage of the plant, which promotes the shriveling of male flowers, avoids normal pollination of female flowers, and prevents the fruiting of female plants, which causes nutrient waste. At the same time, spraying urea and potassium dihydrogen phosphate on the leaves can promote the growth of plant stems and leaves, thereby increasing yield. Most of the asparagus grown in production is a mixed male and female variety. Female and male plants bloom every year, and female plants fruit after pollination. Part of the dry matter accumulated in the female plants is used for fruit development, which wastes nutrients and reduces the yield of tender stems by about 25%. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The morphology of asparagus mother stem plants is shown, wherein A shows the morphology of an unpruned mother stem; B shows the morphology of a mother stem after pruning according to the method of the present invention, with an arch appearing in the red circle and branches and leaves remaining at the arrows; C shows the morphology of a mother stem after over-pruning, with no arch appearing in the red circle and branches and leaves being over-pruned at the arrows; and D shows that new branches have been regenerated from the mother stem after over-pruning.

[0027] Figure 2 The morphology of asparagus male flowers is shown, wherein A, D, and E are normal untreated male flowers; and B, C, and F are withered male flowers after spraying 5% urea plus 3‰ potassium dihydrogen phosphate.

[0028] Figure 3The figure shows the fruiting condition of female asparagus plants, wherein A shows that the mother stems of female asparagus plants have more fruiting, and B shows that the mother stems of asparagus plants are not fruiting after being treated by the method.

[0029] Figure 4 The morphology of asparagus mother stems is shown, wherein A is a cracked asparagus mother stem; and B is a healthy asparagus mother stem treated by the method of the present invention. DETAILED DESCRIPTION

[0030] 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 should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0031] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that the upper and lower limits of the scope and each intermediate value therebetween are specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0032] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings 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 a conflict with any incorporated document, the content of this specification shall prevail.

[0033] Method for keeping mother stems of asparagus and shaping plant shape of the group

[0034] One aspect of the present invention provides a method for maintaining mother stems of asparagus and shaping the plant population. In a preferred embodiment, the method of the present invention comprises:

[0035] (1) Maintain appropriate distance between mother stems;

[0036] (2) Pruning the mother stem: After the branches and leaves of the mother stem are fully expanded, prune the mother stem according to the formula Y = -0.015x 2 +94 for pruning, where Y represents the plant height, and x represents the distance between the outer branches and leaves close to each other in two rows, 30cm≤Y≤80cm;

[0037] (3) supplementing light, repelling insects, and managing water and fertilizer on the mother stem;

[0038] (4) Apply fertilizer to suppress male sex in early flowering stage to prevent female plants from bearing fruit.

[0039] In the present invention, "group plant shape shaping" refers to adjusting the plant shape structure of the asparagus mother stem group through artificial management measures and technical means, such as but not limited to leaf shape, stem shape, etc.

[0040] The present invention increases the light intensity between asparagus mother stems by limiting the distance between mother stems, improves the photosynthetic rate, increases the storage amount of photosynthetic products of mother stems in the root system, and reduces the occurrence of diseases. In a preferred embodiment, the distance between the mother stems of two-year-old asparagus is more than 2 cm, such as 2, 3, 4, 5, 6, 7, 8, 9, 10 cm. In another preferred embodiment, the distance between the mother stems of three-year-old and above asparagus is more than 3 cm, such as 3, 4, 5, 6, 7, 8, 9, 10 cm.

[0041] After pruning using the pruning method of step (2) of the present invention, the branches between the two rows of plants form an arch, which increases the light intensity of the plant branches and leaves and the photosynthetic rate of the plant, reduces labor costs, and facilitates plant ventilation and light transmission and field operations when leaving mother stems to pick bamboo shoots.

[0042] The present invention enhances the light intensity and photosynthetic rate, improves the asparagus yield, and effectively reduces the number of pests such as white planthoppers and aphids, and reduces the amount of pesticides by taking supplementary light and insect repellent measures. In a preferred embodiment, the supplementary light and insect repellent includes the step of laying a reflective film under the mother stem, wherein the distance between the reflective film and the mother stem is 6-8 cm, such as 6, 6.2, 6.4, 6.6, 6.8, 7, 7.2, 7.4, 7.6, 7.8, 8 cm, and the width of the reflective film is 20-30 cm, preferably 21-29 cm, and also preferably 22-28 cm, such as 22, 22.5, 23, 23.5, 24, 24.5, 25, 25.5, 26, 26.5, 27, 27.5, 28 cm.

[0043] In a preferred embodiment, the water and fertilizer management includes applying organic fertilizer and high-potassium compound fertilizer before retaining the mother stem, and the soil water holding capacity is maintained at 60-70% during the period of retaining the mother stem, for example, 60%, 60.5%, 61%, 61.5%, 62%, 62.5%, 63%, 63.5%, 64%, 64.5%, 65%, 65.5%, 66%, 66.5%, 67%, 67.5%, 68%, 68.5%, 69%, 69.5%, and 70%. Maintaining soil water holding capacity preferably follows the principle of "small amounts and multiple times".

[0044] The present invention effectively avoids plant stem cracks and reduces the occurrence of diseases by performing water and fertilizer management. In a preferred embodiment, the water and fertilizer management includes opening a small ditch 15-25 cm (preferably 16-24 cm, and more preferably 17-23 cm, such as 17, 17.5, 18, 18.5, 19, 19.5, 20, 20.5, 21, 21.5, 22, 22.5, 23 cm) away from the planting row before leaving the mother stem, and applying 150-250 jin per mu of organic fertilizer, preferably 160-240 jin, and more preferably 170-230 jin, such as 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225, 230 jin, 5-15 jin of high-potassium compound fertilizer, preferably 6-14 jin, also preferably 7-13 jin, for example 7, 8, 9, 10, 11, 12, 13 jin, before, during and after the mother stem and side branches unfold, spray the stems with 5-10% (preferably 6-10%, also preferably 7-10%, for example 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%) of wood ash extract.

[0045] The present invention promotes the shriveling of male flowers and achieves a zero fruiting rate of female plants by taking measures to avoid fruiting of the mother stems, thereby avoiding the nutrient waste caused by fruiting of the female plants to promote plant growth, thereby increasing the yield of asparagus. In a preferred embodiment, the plants in the early flowering period are sprayed with 1-6% (preferably 1-5.5%, also preferably 1-5%, such as 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%) urea and 1-5‰ (preferably 1-4.5‰, also preferably 1-4‰, more preferably 1-3‰, such as 1‰, 1.5‰, 2‰, 2.5‰, 3‰) potassium dihydrogen phosphate. In a specific embodiment, 3% urea and 3‰ potassium dihydrogen phosphate are sprayed. In another specific embodiment, 4% urea and 3‰ potassium dihydrogen phosphate are sprayed. In another specific embodiment, 5% urea and 3‰ potassium dihydrogen phosphate are sprayed.

[0046] In a preferred embodiment, the spraying is performed once every 4-8 days (e.g., 4, 5, 6, 7, 8 days), for 2-4 consecutive times (e.g., 2, 3, 4 times), and before 9 o'clock every day (e.g., 6, 7, 8 o'clock).

[0047] application

[0048] One aspect of the present invention provides the use of the method of the present invention in improving the quality of asparagus mother stems and / or asparagus yield.

[0049] The method of the present invention can improve the quality of asparagus mother stems (for example, but not limited to increasing the thickness of the mother stems, increasing the nutritional content of the mother stems, etc.), thereby increasing the yield of asparagus. For example, in the embodiment of the present invention, the mother stems treated with the management method of the present invention increased the asparagus yield by at least 11.03% compared with the control group.

[0050] Example 1

[0051] The following shows the effects of asparagus stem pruning and supplementary lighting on net photosynthetic rate and yield.

[0052] The 4-year-old asparagus "Jinglu Lu No. 1" was used as the test material and cultivated in a greenhouse. The test site is medium loam, loose in texture, flat in land, and the previous crop is potatoes, with medium to high fertility and good drainage and irrigation conditions. One plant was planted in each nest, with a row spacing of 1.5m, a plant spacing of 0.3m, a planting ditch width of 0.4m, a depth of 0.4m, and a protective row around. One month after the leaves and branches of the mother stems of asparagus were fully expanded in the spring of 2023, the control was not trimmed and the reflective film was not laid, and this pruning method was used as treatment one, according to the formula Y = -0.015x 2 +94: Prune the longer branches below 70cm. After pruning, the branches between two rows of plants form an arch. When the plant is 40cm high, the distance between the branches and leaves is about 60cm; when the plant is 70cm high, the distance between the branches and leaves is about 40cm; Treatment 2: Prune the longer branches below 70cm. When the plant is 40cm high, the distance between the branches and leaves is about 60cm; when the plant is 70cm high, the distance between the branches and leaves is about 60cm; Each treatment is set with or without reflective film. Each plot has 4 rows, a length of 10m, and a plot area of ​​45m 2 Each treatment was repeated three times, and the fertilizer and water management of each treatment group was the same. The net photosynthetic rate (Pn) of the leaves of 5 branches at the bottom (40 cm), middle (70 cm), and top (110 cm) of each treatment plant was measured from 9:00 to 11:00 in the morning. The unit is μmol CO2·m -2 ·s -1 ; photosynthetically active radiation (PAR), unit: μmol·(m 2 ·s) -1 In 2024, the yield of 50 asparagus plants was counted in each replicate.

[0053] Table 1 Effects of pruning and supplementary lighting on net photosynthetic rate of asparagus stems

[0054]

[0055]

[0056] The results showed that the pruning treatment according to this method had a significant effect on increasing light intensity and improving the net photosynthetic rate of leaves. In treatment 1, the light intensity of the lower part of the plant increased by 89.4% and 83.8% on the sunny side and the shady side, respectively, and the net photosynthetic rate increased by 16.1% and 23.1%. The light intensity of the middle part of the plant increased by 61.0% and 46.9% on the sunny side and the shady side, respectively, and the net photosynthetic rate increased by 30.5% and 28.1%. The light intensity of the upper part of the plant increased by 6.3% and 2.0% on the sunny side and the shady side, respectively, and the net photosynthetic rate increased by 4.9% and 6.2%. This method mainly increases the light intensity of the lower and middle parts of the asparagus plant, especially the light intensity of the lower part increased by more than 80%, and the net photosynthetic rate of the lower and middle parts increased by 16.1%-30.5%. After excessive pruning of branches and leaves in Treatment 2, although the light intensity and net photosynthetic rate in the lower and middle parts of the plant were slightly higher than those in Treatment 1, excessive pruning of the middle and lower branches and leaves promoted the sprouting and growth of new branches in the lower part, affecting the nutrient supply of the upper branches and leaves, causing the net photosynthetic rate in the upper part of the plant to be lower than that in the control and Treatment 1.

[0057] Table 2 Effects of pruning mother stems and supplementary lighting on yield of asparagus

[0058]

[0059] The results showed that in treatment 1, the plants with pruned branches and leaves by this method had an increase of 11.03% in yield after supplementary lighting, which was the best yield increase effect. The second was to use this method to prune branches and leaves without supplementary lighting. However, the yield increase effect of supplementary lighting with reflective film without pruning branches and leaves was not obvious. This may be because the branches and leaves of asparagus were too lush and the gaps between the branches and leaves of the plants were too small, so the sunlight could not reach the inside and lower part of the plants. Even if reflective film was used to supplement light, it could not achieve a good effect. Treatment 2 was excessive pruning. Although the photosynthetic rate of the plant was enhanced, the accumulated nutrients were reduced due to the large reduction in branches and leaves, especially the functional leaves with the strongest photosynthetic function near the middle 70 cm, so the yield was reduced by more than 5% compared with the control.

[0060] Example 2

[0061] The following shows the effect of spraying urea and potassium dihydrogen phosphate on the fruiting of female asparagus plants during the flowering period.

[0062] The 4-year-old mixed male and female asparagus variety "Jinglu Lu No. 1" was used as the experimental material. After the bare asparagus was harvested in spring, the mother stems were retained on April 22. Urea and 3‰ potassium dihydrogen phosphate were sprayed from the flowering stage, and the urea concentration was set to 3% , 4%, and 5%; the number of sprayings was set to 3: Treatment 1 sprayed urea at the initial flowering stage of asparagus, a total of 1 spray; Treatment 2 sprayed urea at the initial flowering stage of asparagus and 6 days after the first spraying, a total of 2 sprays; Treatment 3 sprayed urea at the initial flowering stage of asparagus, 6 days after the first spraying, and 12 days after the first spraying, a total of 3 sprays; The control was sprayed with water each time, and the area of ​​the plot was 45m 2, repeated 3 times. Spraying with clean water was used as the control. Ten female plants were randomly selected from each plot, marked with a sign, and the number of fruit set on the marked branches was investigated on the 30th day after spraying with urea and 3‰ potassium dihydrogen phosphate. The growth of the plants was also observed to see if fertilizer damage occurred.

[0063] Table 3 Effects of spraying urea and potassium dihydrogen phosphate on the fruiting of female asparagus stems at the initial flowering stage

[0064]

[0065] The results showed that the fruit setting rate of asparagus could be reduced by spraying 3 concentrations of urea and 3‰ potassium dihydrogen phosphate once, twice, or three times, and the fruit setting rate gradually decreased with the increase of urea concentration and the number of times used. Through observation, it was found that the stamens of male asparagus flowers were sensitive to urea and potassium dihydrogen phosphate solutions. After being stimulated, the stamens were easily shriveled and could not form pollen, and the female flowers could not be pollinated and fruited normally.

[0066] Therefore, the use of the method can increase the net photosynthetic rate of the asparagus mother stem, effectively avoid cracks in the plant stems, prevent lodging, reduce diseases, facilitate field operations when picking asparagus by leaving the mother stems, promote the shriveling of male flowers to avoid pollination and fruiting of female plants, avoid nutrient waste, promote plant growth, and increase yield.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for cultivating asparagus mother stems and shaping the plant shape of the group, characterized in that: include: (1) Maintain appropriate distance between mother stems; (2) Pruning the mother stem: After the branches and leaves of the mother stem are fully expanded, prune the mother stem according to the formula Y = -0.015x 2 +94 for pruning, where Y represents the plant height, and x represents the distance between the outer branches and leaves close to each other in two rows, 30cm≤Y≤80cm; (3) supplementing light, repelling insects, and managing water and fertilizer on the mother stem; (4) Apply fertilizer to suppress male sex in early flowering stage to prevent female plants from bearing fruit.

2. The method for coordinating plant shape of asparagus population by retaining mother stems according to claim 1, characterized in that: In step (1), the distance between the mother stems of the biennial asparagus is more than 2 cm.

3. The method for collaborative plant shaping of asparagus mother stems according to claim 1, characterized in that: In step (1), the distance between the mother stems of three-year-old and older asparagus is more than 3 cm.

4. The method for coordinating plant type shaping of asparagus mother stems by retaining them according to claim 1, characterized in that: In step (3), the light supplement and insect repellent comprises the step of laying a reflective film under the mother stem.

5. The method for coordinating plant type shaping of asparagus mother stems by retaining them according to claim 4, characterized in that: The distance between the reflective film and the mother stem is 6-8 cm, and the width of the reflective film is 20-30 cm.

6. The method for coordinating plant shape of asparagus population by retaining mother stems according to claim 1, characterized in that: The water and fertilizer management includes: applying organic fertilizer and high-potassium compound fertilizer before retaining the mother stem, and maintaining the soil water holding capacity at 60-70% during the period of retaining the mother stem.

7. The method for coordinating plant shape of asparagus colonies by retaining mother stems of asparagus according to claim 6, characterized in that: Before leaving the mother stem, dig a small trench 15-25 cm away from the planting row, apply 150-250 catties of organic fertilizer and 5-15 catties of high-potassium compound fertilizer per mu, and spray the stems with 5-10% wood ash extract before, during and after the side branches of the mother stem unfold.

8. The method for coordinating plant shape of asparagus population by retaining mother stems according to claim 1, characterized in that: During the initial flowering period, spray the plants with 1-6% urea and 1-5‰ potassium dihydrogen phosphate.

9. The method for coordinating plant shape of asparagus colonies by retaining mother stems of asparagus according to claim 8, characterized in that: The spraying is performed once every 4-8 days, for 2-4 consecutive times, before 9 o'clock every day.

10. Use of the method according to any one of claims 1 to 9 in improving the quality of asparagus mother stems and / or asparagus yield.

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