CN115191259B - Navel orange single-dry cylinder high-light-efficiency tree form cultivation method - Google Patents
Navel orange single-dry cylinder high-light-efficiency tree form cultivation method Download PDFInfo
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/005—Following a specific plan, e.g. pattern
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/007—Determining fertilization requirements
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G17/00—Cultivation of hops, vines, fruit trees, or like trees
- A01G17/005—Cultivation methods
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Abstract
The invention provides a navel orange single-dry cylinder high-light-efficiency tree-shaped cultivation method, wherein the crown height is 2-2.5m, and the crown diameter is 1-1.5m; the central trunk has no branches below 40cm, 1.2 branch tips are arranged at intervals of 10cm above 40cm on average, and the lengths of branch groups formed by the branch tips are controlled to be 45-70cm and distributed radially. The main branch concept is desalted by the tree shape, a plurality of branch groups are uniformly cultivated on the cultivated central trunk, the tree body is simple in structure, the crown diameter of the tree crown is greatly reduced, and the purposes of facilitating mechanical management, reducing the labor input and improving the labor efficiency are achieved; meanwhile, the photosynthetic efficiency of the whole plant is basically consistent, the quality consistency of the whole plant is higher, and the commodity rate of fruits is greatly improved.
Description
Technical Field
The invention relates to the technical field of fruit tree cultivation, in particular to a single-stem cylindrical high-light-efficiency tree cultivation method for navel oranges.
Background
Navel orange is an important fresh citrus variety, and is an important enrichment tree in mountain areas such as Gannan, sanxia reservoir areas and the like in China. The traditional tree form of the navel orange is a natural round head shape (figure 1), the general tree body of an adult tree is high, the height and crown diameter of the tree are both more than 3m, the manual pruning, the pesticide spraying or the fruit picking are inconvenient, and even if the mechanical pesticide spraying is used, the inside or the top of the tree crown is difficult to be sprayed in place. Meanwhile, the quality consistency of fruits at different parts of the traditional natural dome-shaped tree form is poor, the commodity rate is low, and the sales price and the orchard operation benefit are seriously influenced, so that a new tree form is needed to meet the requirements of healthy development of citrus industries such as navel oranges in new times.
Disclosure of Invention
In view of the above, the invention provides a single-stem cylindrical high-light-efficiency tree cultivation method for navel oranges, which has high yield and quality and is convenient to manage.
The technical scheme of the invention is realized as follows: the invention provides a navel orange single-dry cylinder high-light-efficiency tree form cultivation method, which comprises the following steps:
s1, selecting strong seedlings which are 60cm away from the ground and have no branches, wherein the diameter of a trunk is larger than 1cm at the position 10cm above a grafting port, as seedling using standards;
s2, planting the seedlings before sprouting in spring, cutting the seedlings in a short way above strong buds at 50-60cm away from the ground on the trunk after planting, standing supporting rods beside the seedlings, and binding the trunks of the seedlings on the supporting rods;
s3, after the truncated terminal buds of the trunk germinate, selecting a top strong tip to be bound on the upright post, and straightening the strong tip to serve as a central trunk; the germination tillers near the strong tips are picked up for controlling growth, the germination tillers with the center stems being more than 40cm are reserved, the germination tillers with the center stems being less than 40cm are removed in time, and when the seedlings grow to 1.8-2.2m, the tips are picked up for controlling growth;
s4, before sprouting in spring of the next year, for the nursery stock with branches on the central trunk, when the length of the branch tip exceeds 30cm, pinching to promote branching; for the seedlings with bad branches on the central trunk, all branches on the central trunk are thinned, so that germination of lateral buds on the central trunk is promoted, at the same time, germination of buds below 40cm of the central trunk is promoted, germination of buds above 40cm of the central trunk is promoted, and 1-1.5 branch tips are evenly arranged at intervals of 8-15 cm;
s5, applying tip-promoting fertilizer before sprouting of early autumn tips in the next year, and when the length of newly-extracted autumn tips on the central trunk reaches 15-25cm, applying fertilizer on leaf surfaces to promote the autumn tips to age, and culturing autumn tip fruiting parent branches;
s6, finishing the culture of the single-trunk cylindrical tree form at the bottom of the second year, controlling the height of the tree to be 2-2.5m, controlling the crown diameter to be 1-1.5m, evenly arranging 1.2 branch tips on the central trunk every 10cm, controlling the length of branch groups formed by the branch tips to be 45-70cm, and radially distributing the branch tips.
Based on the above technical solution, preferably, in step S5, the existing branch tip is moderately cut, and early autumn tip extraction is promoted.
Based on the above technical solution, preferably, in step S2, a plastic bag is sleeved on the portion from the top end to 40cm from the ground, the plastic bag is fastened, and when the young shoots growing from the strong buds grow to 5cm, the plastic bag is removed.
On the basis of the technical scheme, preferably, during the field planting of the seedlings in the spring in the step S2, the planting furrows are filled with organic fertilizer and calcium magnesium phosphate fertilizer, and each plant of tree is applied with 2-3kg of organic fertilizer and 0.4-0.6kg of calcium magnesium phosphate fertilizer.
On the basis of the technical scheme, preferably, in the first-year summer and autumn shoot extraction stage, nitrogen and potassium fertilizers are dripped on each plant of tree, simultaneously insecticide is sprayed in the process of extracting and producing each batch of shoots, and different insecticide is alternately used for different batches of shoots.
On the basis of the technical scheme, preferably, 10-50g of nitrogen fertilizer and 8-40g of potassium fertilizer are applied to each tree, and the tree is dripped for 3-4 times.
On the basis of the technical scheme, preferably, after the branches are thinned in the central trunk in the step S4, 40-60g of nitrogenous fertilizer and 32-48g of potash fertilizer are applied to each tree, and the lateral buds on the central trunk are promoted to germinate after 3-4 times of dripping or pouring.
On the basis of the technical scheme, preferably, the fertilizing method of the tip-promoting fertilizer in the step S5 comprises the following steps: before the germination of the early autumn tips, 30-50g of nitrogen fertilizer and 12-16g of potassium fertilizer are applied to each tree, and the tree is dripped or poured for 2-3 times.
Based on the above technical scheme, preferably, the foliar fertilizer in step S5 is 0.3-0.5% of potassium dihydrogen phosphate.
Based on the technical scheme, preferably, the strong seedlings used in the step S1 are container seedlings or soil-bearing ball seedlings for 2-3 years.
Compared with the prior art, the navel orange single-dry cylinder high-light-efficiency tree form cultivation method has the following beneficial effects:
according to the principle of combining agriculture and agricultural machinery, the invention develops a single-stem cylindrical high-light-efficiency tree cultivation method of navel orange, aiming at the requirements of using mechanical pesticide spraying, reducing the manual management cost and improving the manual management efficiency, wherein the main branch concept is desalted by the tree, a plurality of branch groups are uniformly cultivated on the cultivated central stem, the height of the crown is 2-2.5m, the crown diameter is 1-1.5m, no branch exists below the central stem, the average of more than 40cm is 1.2 branch tips every 10cm, and the length of the branch groups is controlled to be 45-70cm and is distributed radially. The tree body has simple structure, greatly reduces the crown diameter of the tree crown, and achieves the purposes of facilitating mechanical management, reducing the labor input and improving the labor efficiency; meanwhile, the photosynthetic efficiency of the whole plant is basically consistent, the quality consistency of the whole plant is higher, and the commodity rate of fruits in a garden is greatly improved.
By adopting the cultivation method, the single-dry cylindrical tree shape can be cultivated in the second year, fruits can be obtained in the third year, the fruits enter the full bearing period in the fourth year, the acre yield can reach 3458.8kg, and the acre yield is far higher than the average acre yield of navel orange in China. And the illumination intensity and the soluble solid matter and solid acid ratio content of the upper, middle and lower parts of the tree form are small in difference, and the fruit quality consistency and commodity rate are high.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a conventional tree-shaped natural dome shape of navel oranges;
FIG. 2 is a first year tree of the single dry cylindrical tree planting of the present invention;
FIG. 3 is a fourth year tree form of the single dry cylindrical tree form field planting of the present invention;
FIG. 4 is a backbone structure model of the single dry cylindrical tree of the present invention.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
1. Single dry cylindrical tree form first year cultivation
(1) Seedling selection
Traditional navel orange seedlings, whether bare root seedlings or container seedlings, generally require 1 trunk and 3 branches. When the single-trunk cylindrical tree form is cultivated, a trunk is required to grow upwards, branches are not required on the trunk, and only single-trunk seedlings are required. Therefore, the seedling using standard of 'no branch below 60cm, the diameter of the trunk at 10cm on the grafting port exceeds 1 cm', namely, container seedlings or strong seedlings with soil and balls, wherein the trunk is not branched below 60cm from the ground, and the diameter of the trunk at 10cm above the grafting port (about 10cm from the ground) is greater than 1cm, are provided.
(2) Planting of nursery stock
The field planting period is before the germination in spring, and before the field planting, the planting ditch is filled with 2-3kg of high-quality decomposed organic fertilizer and 0.4-0.6kg of calcium magnesium phosphate fertilizer. As a result of comparing the effect of the fertilizer applied in the planting furrows with the effect of the fertilizer applied without the fertilizer on the plant growth, the result shows that after the organic fertilizer and the calcium magnesium phosphate fertilizer are buried, the average growth height of the seedlings reaches 2.2m in one year, and the total growth of the growth amount of the branch tips reaches 437.2cm and 30cm 2 319.3 root tips of the soil cross-sectional area; the average height of the plant which is not buried is only 1.6m, the total growth length of the branch tip is 225.3cm and 30cm 2 The root tips of the soil cross-sectional area are 70.5. The method shows that the landfill organic fertilizer and the calcium magnesium phosphate fertilizer can obviously promote the growth of the tree body and the branch tip, is beneficial to root growth and the like, and promotes the rapid cultivation and formation of the single-dry cylindrical tree form.
Cutting the trunk at 50-60cm above strong buds, sleeving a plastic bag on the part of the trunk from the top to 40cm above the ground, and fastening the plastic bag to promote germination; after germination, the air is timely ventilated to prevent the tender shoots from being burned, and the plastic bag is removed when the tender tips growing out of the strong buds grow to 5 cm. And (3) cutting while standing a supporting rod beside the seedling, and binding the trunk of the seedling on the supporting rod to enable the trunk to grow vertically. After the truncated terminal buds of the trunk germinate, selecting a strong tip at the top to be bound on the upright post, and straightening the strong tip to serve as a central trunk. And (3) picking the sprouts near the strong tips to control the growth, retaining the sprouts with the center stems more than 40cm, timely removing the sprouts with the center stems less than 40cm, and continuously picking the tips to control the growth when the seedlings grow to 1.8-2.2 m.
(3) Management during shoot growth
In order to ensure the quick formation of the single-dry cylindrical tree form, the adequate extraction and growth of the young shoots must be ensured during the growth season of the navel orange, 10-50g of nitrogen fertilizer and 8-40g of potassium fertilizer are applied to each tree drop by drop in the summer and autumn tip extraction stage, the dropping is completed for 3-4 times, meanwhile, in order to reduce the pest control difficulty, pesticides (thiamethoxam, imidacloprid or fipronil) are sprayed in the extraction process of each batch of young shoots, and different pesticides are alternately used for different batches of young shoots. After the end of the growth of the last batch of shoots, investigation shows that 30g of nitrogen fertilizer and 24g of potassium fertilizer, 40g of nitrogen fertilizer and 32g of potassium fertilizer have the best fertilizer dropping effect, the average height of each plant of tree reaches 2.1m and 2.3m respectively, and the total length of the shoot growth amounts reaches 541.8cm and 535.1cm respectively.
In the first year after field planting, except management, the sprouts below 40cm from the central trunk to the ground are mainly removed continuously, and at the same time, the top-drawer strong tips are tied on the support rods from time to time, so that the growth of the strong tips is promoted by straightening, and finally the target height is 2.0-2.5m.
2. Promoting shoot growth and flower bud differentiation in the second year after field planting
(1) Removing branch tip on central trunk in spring
Before sprouting in spring of the next year, for the nursery stock with branches on the central trunk, when the length of the branch tip exceeds 30cm, picking the core to promote branching; for navel orange trees with poor branches on the central trunk, all branches on the central trunk are thinned, lateral buds on the central trunk are promoted to germinate, meanwhile, buds below 40cm of the central trunk are removed, and buds above 40cm of the central trunk are promoted to germinate; ensuring that the center stem is more than 40cm, and 1 to 1.5 new shoots are arranged at intervals of 8 to 15cm on average.
According to the nutrient requirement of the growth amount of the young shoots in spring, 40-60g of nitrogen fertilizer and 32-48g of potassium fertilizer are applied to each tree after the branches are thinned, and the germination of lateral buds on the central trunk is promoted after the fertilizer is dripped or poured for 4 times.
Through investigation, the germination growth rate of buds is very low without thinning, the central trunk only germinates and takes out 0.2 buds every 10cm, and after thinning, almost every bud can germinate and take out 1.2 buds every 10cm, and the average length of a branch group is about 50 cm; the effect of promoting the germination and growth of buds on the central trunk by the branch thinning treatment is very good, and the single-trunk cylindrical tree form cultivation is successful.
(2) Autumn tip management
The young shoots are aged in time (the self-shearing of the young shoots of the navel orange is a sign of beginning to enter the aging) is a precondition for carrying out flower bud differentiation and ensuring that the young shoots can bloom and fruit set in the next year. The single-dry cylindrical tree shape of the navel orange is cultivated to the second year, and enough autumn-tip fruiting parent branches need to be cultivated to lay a foundation for flowering and fruit setting in the next year (the third year).
The existing branch shoots are subjected to moderate chopping, early autumn shoot is promoted to be light, the early autumn shoot is dripped or poured with a shoot promoting fertilizer before germination, 30-50g of nitrogen fertilizer and 12-16g of potassium fertilizer are dripped or poured for 2-3 times according to the nutrient requirement of the growth amount, when the length of the newly light autumn shoot on the central trunk is 15-25cm, the leaf surface is sprayed with 1 time of potassium dihydrogen phosphate with the concentration of 0.3-0.5%, so that the old growth of the new shoot is promoted, and the female branch of the autumn shoot is cultivated, thereby being beneficial to flowering and fruit setting in the next year.
As shown in fig. 4, the left view is a top view and the right view is a front view. After two years of cultivation, the cultivation of the single trunk cylindrical tree form at the bottom of the second year is completed, the height of the tree is controlled to be 2-2.5m, the crown diameter is controlled to be 1-1.5m, 1.2 branch tips are evenly arranged on the central trunk every 10cm, the length of branch groups formed by the branch tips is controlled to be 45-70cm, and the branch tips are distributed radially.
The average height of the single trunk tree forms cultivated by the method is 2.47+/-0.12 m, the crown diameter is 1.28+/-0.21 m, the extraction and the light generation of east, west, south and north branch tips are basically consistent, and 1.2 branch tips are arranged on the central trunk on average every 10cm length, so that a single trunk cylindrical tree form is formed.
Compared with the traditional natural round head tree form (crown height and crown diameter are both more than 3.0 m), the single-trunk cylindrical tree form is convenient to manage, and labor efficiency is improved; especially, the small crown diameter can ensure that the liquid medicine for mechanical spraying can enter the inside of the tree crown, thereby improving the control effect of plant diseases and insect pests.
At the same planting site (the fruit tree base of Huazhong agricultural university), the same water and fertilizer management mode is adopted, and the illumination intensity and the fruit quality of the conventional natural round head shape of the navel orange and the single-dry cylindrical tree shape of the invention are measured.
When the same planting row spacing is 5m, the illumination intensities of the upper layer, the middle layer and the lower layer of the single-trunk cylindrical tree crown are 973+/-105.1 (lux), 957+/-184.7 (lux) and 944+/-144.9 (lux) respectively, and the difference of the upper, middle and lower illumination intensities is not large; the light intensity of the lower part is only 30% of the light intensity of the upper part, and the high light efficiency of the tree shape of the invention is shown.
The quality of fruits at the upper layer, the middle layer and the lower layer of the single-dry cylindrical tree form is analyzed, and the data show that: the soluble solids of the fruits at the upper, middle and lower layers are 12.8+ -0.9%, 12.7+ -0.8% and 12.7+ -0.2%, respectively, and the titratable acids are 0.57+ -0.06%, 0.68+ -0.09% and 0.70+ -0.03%, respectively, which are not very different. The soluble solids of the upper layer and the lower layer of the conventional natural round head shape are respectively 12.1 percent and 10.4 percent, and the content of titratable acid is respectively 0.52 percent and 0.84 percent, and the difference is very large, thereby indicating that the quality consistency and commodity rate of fruits produced by the tree shape are high.
The average acre yield of the navel orange is about 1500kg, and the average acre yield of the orchard with good planting management is not more than 2500kg. The single-stem cylindrical tree form is planted in 2017, the tree form is cultivated and formed in the second year of planting (the end of 2018), and the starting result of the 3 rd year of planting (2019) shows good stable yield and high yield through the field evaluation of experts in 3 consecutive years: fruit bearing starts in 2019, the average yield of single plants produced by on-site measurement is 7.6kg, and the yield is 1687.2kg per mu; the field planting is carried out in full bearing period in the 4 th year (2020), the yield of single plant is 15.6kg on site, which is equivalent to 3463.2kg per mu; the field measurement yield of the single plant in the 5 th year (2021) of field planting is 14.1kg on average, which is equivalent to 3130.2kg per mu. Therefore, the average acreage yield of the single dry cylindrical tree form is higher than that of navel oranges in China, and the single dry cylindrical tree form has higher economic benefit and is a good popularization tree form in navel orange producing areas.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A navel orange single-dry cylinder high-light-efficiency tree-shaped cultivation method is characterized by comprising the following steps of: the method comprises the following steps:
s1, selecting strong seedlings with the trunk diameter larger than 1cm at the position 10cm above a grafting port as seedling using standards, wherein the trunk is 60cm below the ground and has no branches;
s2, planting the seedlings before sprouting in spring, cutting the seedlings in a short way above strong buds at 50-60cm away from the ground on the trunk after planting, standing supporting rods beside the seedlings, and binding the trunks of the seedlings on the supporting rods;
s3, after the truncated terminal buds of the trunk germinate, selecting a top strong tip to be bound on the upright post, and straightening the strong tip to serve as a central trunk; the germination tillers near the strong tips are picked up for controlling growth, the germination tillers with the center stems being more than 40cm are reserved, the germination tillers with the center stems being less than 40cm are removed in time, and when the seedlings grow to 1.8-2.2m, the tips are picked up for controlling growth;
s4, before sprouting in spring of the next year, for the nursery stock with branches on the central trunk, when the length of the branch tip exceeds 30cm, pinching to promote branching; for the seedlings with bad branches on the central trunk, all branches on the central trunk are thinned, so that germination of lateral buds on the central trunk is promoted, at the same time, germination of buds below 40cm of the central trunk is promoted, germination of buds above 40cm of the central trunk is promoted, and 1-1.5 branch tips are evenly arranged at intervals of 8-15 cm;
s5, applying tip-promoting fertilizer before sprouting of early autumn tips in the next year, and when the length of newly-extracted autumn tips on the central trunk reaches 15-25cm, applying fertilizer on leaf surfaces to promote the autumn tips to age, and culturing autumn tip fruiting parent branches;
s6, finishing the culture of the single-trunk cylindrical tree form at the bottom of the second year, controlling the height of the tree to be 2-2.5m, controlling the crown diameter to be 1-1.5m, evenly arranging 1.2 branch tips on the central trunk every 10cm, controlling the length of branch groups formed by the branch tips to be 45-70cm, and radially distributing the branch tips.
2. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: in step S5, the existing branch tips are subjected to moderate chopping, and early autumn tip extraction is promoted.
3. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: in the step S2, a plastic bag is sleeved on the part from the top end to 40cm away from the ground, the plastic bag is fastened, and when the tender tips growing out of the strong buds grow to 5cm, the plastic bag is removed.
4. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: and S2, during field planting of the seedlings in spring, the planting furrows are filled with organic fertilizer and calcium magnesium phosphate fertilizer, and each plant of tree is applied with 2-3kg of organic fertilizer and 0.4-0.6kg of calcium magnesium phosphate fertilizer.
5. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: in the first-year summer and autumn shoot extraction stage, nitrogen and potassium fertilizers are dripped on each plant of tree, meanwhile, pesticides are sprayed in the process of extracting and generating new shoots in each batch, and different pesticides are alternately used for different batches of new shoots.
6. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 5, wherein the method comprises the following steps: applying 10-50g of nitrogen fertilizer and 8-40g of potassium fertilizer to each tree, and dripping for 3-4 times.
7. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: and S4, after the branches of the central trunk are thinned, dressing 40-60g of nitrogenous fertilizer and 32-48g of potash fertilizer for each tree, and dripping or pouring for 3-4 times to promote the germination of lateral buds on the central trunk.
8. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: the fertilizing method of the tip fertilizer in the step S5 is as follows: before the germination of the early autumn tips, 30-50g of nitrogen fertilizer and 12-16g of potassium fertilizer are applied to each tree, and the tree is dripped or poured for 2-3 times.
9. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: in the step S5, the foliar fertilizer is potassium dihydrogen phosphate with the concentration of 0.3-0.5%.
10. The navel orange single-dry cylinder high-light-efficiency tree cultivation method according to claim 1, wherein the method comprises the following steps: the strong seedlings used in the step S1 are container seedlings or soil-bearing ball seedlings for 2-3 years.
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| CN104823741A (en) * | 2015-05-05 | 2015-08-12 | 湖北省农业科学院果树茶叶研究所 | Hedgerow training method for sweet persimmon |
| CN110352735A (en) * | 2019-08-15 | 2019-10-22 | 安徽农业大学 | Southern Chinese pear " umbrella room shape " tree structure and its shaping and trimming method and application |
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