Method for increasing and stabilizing yield by mixed planting of multiple good varieties and strains of Hainan camellia oleifera

Abstract

The invention relates to an agricultural cultivation technology, in particular to a method for increasing and stabilizing yield by mixed planting of multiple good varieties and strains of Hainan camellia oleifera. The method comprises the following steps: S1, forest land selection and soil preparation; s2, hole application of base fertilizer; s3, field planting of camellia oleifera seedling plants; s4, selection of a mixed variety; s5, fertilizer management; s6, water management; s7, plant management; s8, disease and pest control; according to the method for increasing yield and stabilizing yield through mixed planting of multiple good varieties and strains of Hainan camellia oleifera, a proper fertilization method is adopted, water and fertilizer management of Hainan camellia oleifera is proper, reasonable plant management is adopted every year, and then the yield of Hainan camellia oleifera is increased; meanwhile, the content of saturated fatty acid in fatty acid composition of the Hainan camellia oleifera planted through the method is low, the content of unsaturated fatty acid is high, and when the camellia oleifera is used by a human body, cardiovascular health is facilitated, metabolism is easier, blood sugar is adjusted, and oxidation resistance and aging resistance are achieved.

Description

Technical Field

[0001] The present invention relates to an agricultural cultivation technique, and particularly to a method for increasing yield and stabilizing production by mixed planting of multiple excellent varieties and strains of Hainan oil-tea camellia. Background Art

[0002] Oil-tea camellia is an evergreen small tree of the genus Camellia in the family Theaceae. It is also the woody oil tree species with the largest cultivated area and a relatively wide distribution range in China. The oil content of oil-tea camellia seeds is relatively high. The tea oil extracted from it is clear in color, fragrant in smell, rich in nutrition, resistant to storage, and contains specific physiological active substances such as vitamin E and camellia glycoside. It has the good reputations of "Oriental olive oil" and "treasure among oils". Hainan oil-tea camellia ( Camellia hainanica ) is one of the four major woody oil crops, also known as big-fruit oil-tea camellia and Luchuan oil-tea camellia. It belongs to the arbor tree species of the genus Camellia in the family Theaceae. It is mainly distributed in the areas of Luchuan County, Guangxi Zhuang Autonomous Region and Gaozhou City, Guangdong Province and the areas south of them in China, and is also planted in Hainan Island. Hainan oil-tea camellia is commonly known as "mountain pomelo" in Hainan Island, and its tea seed oil has the good reputation of "king of kings". The oil-tea camellia industry chain is long and the comprehensive utilization value is high. The oil-tea camellia combines ecological benefits, economic benefits and social benefits. Different oil-tea camellias have different climate adaptabilities and growth characteristics. In the existing oil-tea camellia planting methods, due to their own limitations, the yield of some oil-tea camellia varieties is relatively low, which will greatly affect the popularization and application of oil-tea camellia. Summary of the Invention

[0003] The main purpose of the present invention is to provide a method for increasing yield and stabilizing production by mixed planting of multiple excellent varieties and strains of Hainan oil-tea camellia.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A method for increasing yield and stabilizing production by mixed planting of multiple excellent varieties and strains of Hainan oil-tea camellia, comprising the following steps: S1, forest land selection and soil preparation: Select a sloping land with an altitude ≤ 600m, open terrain and good sun exposure. When reclaiming, remove the weeds and shrubs on the sloping land, deeply plow the sloping land after removal, with a depth ≥ 40cm. Arrange the forest land from top to bottom according to the slope trend, dig planting holes at a row spacing of 4×3m, and set the planting holes in adjacent rows in a staggered manner; S2, hole application of base fertilizer: The base fertilizer before planting oil-tea camellia is mainly composed of decomposed organic fertilizer. In the early stage of fixing the roots, apply 20-25kg of organic fertilizer in the hole, and apply fertilizer reasonably according to the principle of "applying thin fertilizer frequently", 3-5 times a year. In the young forest period of oil-tea camellia, apply organic fertilizer, the fertilization time is in the spring of the current year, and the fertilization amount is 16675-20625kg / hm 2 ; S3, Planting of oil-tea seedlings: Planting time is between October and March each year. On the forest land with basal fertilizer, the planting holes are 3m apart and 45cm deep. Water the holes to establish roots after planting. Water the oil-tea seedlings every two days within one month after planting. S4, selection of hybrid varieties and strains: ensure that the growth habits of Hainan oil-tea varieties and strains in the forest are similar, and have the characteristics of rapid growth, high yield, stable yield, high oil quality, and strong adaptability. Select varieties and strains with similar phenological periods; S5, Fertilizer management: dig a hole 20-30cm away from the root of the seedling and apply 50-100g of potassium sulfate compound fertilizer to ensure sufficient fertility. In the later stage, topdressing is carried out by hole application, strip application or ring application. Dig trenches around the vertical projection of the tree crown. The specifications of the trenches are 20cm×30cm×40cm. Mix the organic fertilizer with the topsoil and cover it with soil and compact it. The trenches are staggered every year. S6, Water management: When the dry season comes, water once every 10 days. When the rainy season comes, do a good job of drainage to maintain root permeability; S7, plant management: cut the main stem of the oil tea tree 0.4m from the ground, wait until new branches sprout, and then select 3-4 thick branches with different directions and 10cm above and below as the main branches. In the second year, add 2-3 more branches on each main branch, staggered, and then use spring buds to cultivate secondary branch groups on the main and secondary branches. Prune according to the ratio of "one stem, three branches and nine tips" to make the root tip structure evenly distributed, remove unused branches and densely sprouted branches at the bottom of the main branch or main stem as soon as possible, and evenly configure the main branches and secondary branches of the oil tea tree to ensure good light transmittance of the crown. During the dormant period, the pruning of the oil tea tree is mainly pruning and shaping, cutting off excess branches and bad branches to reduce the consumption of nutrients and water. It is not suitable for high-intensity pruning during the growing season. The main pruning methods are pinching, bud removal, and sprout removal. S8, pest and disease management: Camellia oleifera is easily damaged by tea moth, blue-winged longhorn beetle, stem borer or termite. After being damaged by pests, the plantation staff will prune and prevent the diseased plants; S9, Harvest: The tea berries will gradually mature in August every year and can be picked in late October. Choose to pick them between the Cold Dew seeds and the Frost seeds. Choose plump, evenly colored, and moderately hard fruits. Remove the ones with insect bites, rot, black spots, and white spots on the surface.

[0005] Furthermore, in step S1, the sloping soil is fertile, loose, less polluted, and has a gentle slope. The soil thickness of the oil tea planting area is ≥80cm, and the drainage effect of the planting area is relatively good. In the land preparation work, when the slope is ≤15°, the full reclamation land preparation method is used; when the slope is between 15°-25°, the strip land preparation method is used.

[0006] Further, in step S2, after the planting holes are dug, they are left to dry in the sun for two months. In August and September, an appropriate amount of fertilizer is applied to the planting holes, and then the holes are filled with soil and the soil is evenly mixed with the fertilizer to ensure that the depth of the planting holes after filling is 45 cm.

[0007] Further, in step S3, during the process of planting Camellia oleifera, the backfill soil is dug open in advance. The roots of the seedlings are covered and compacted with fine soil, and then the backfill soil is covered again and compacted. After the seedlings are planted, water is poured thoroughly at the roots in a timely manner.

[0008] Further, in step S4, eight excellent varieties with similar phenological periods and adapted to the ecological conditions of the planting area, namely Dongsheng 1, Dongsheng 10, Dongsheng 20, Huishan 113, Haida 2, Haida 4, Boao 8, and Boao 11, are selected for afforestation.

[0009] Further, in step S5, fertilization is carried out after fruit picking in December, fruit retention fertilizer is applied in March, and fruit swelling fertilizer is applied in June. More organic fertilizers are applied. Camellia oleifera is not fertilized in the first year after planting, and topdressing is carried out every spring starting from the second year, adopting the method of applying small amounts but multiple times.

[0010] Further, in step S7, flower and fruit retention fertilizer is applied to increase the pollination probability of Camellia oleifera. The Camellia oleifera is topped, and the branches below 20 cm are removed. The overbearing branches, crossing branches, and overlapping branches are pruned. Pruning is carried out every November after fruit picking and fertilization. During the young age of Camellia oleifera, pruning starts when it grows to 1 m in height. During the full fruit period, pruning is carried out according to the mode of thinning the inner cavity, shortening the top shoots, and controlling the tree crown. During the senescence period, pruning is carried out to maintain the quality of branches, buds, and leaves.

[0011] Further, in step S8, when Camellia oleifera suffers from soft rot disease, the branches and leaves are regularly pruned, and at the same time, Bordeaux mixture and carbendazim chemical reagents with a longer drug effect time and better effect are introduced. After Camellia oleifera is damaged by tea shoot moths, the diseased plants are pruned, and Bacillus thuringiensis is used for prevention, or prevention is carried out through insecticidal lamps. When damaged by stem borers, trichlorfon drugs are used for control. When damaged by termites, prevention is carried out by using food trapping methods.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By reasonably selecting the varieties and strains of Hainan Camellia oleifera and adopting a scientific and reasonable mixed planting method, and through a series of management measures, scientific and reasonable management of Hainan Camellia oleifera is carried out, and a method for increasing production and stabilizing yield by mixed planting of multiple excellent varieties and strains of Hainan Camellia oleifera is provided; 2. During the transplanting and planting process of the present invention, cultivation is carried out according to eight different Camellia oleifera varieties, which can improve the pollen density during the flowering period, and flower and fruit retention fertilizer is applied to promote flower bud differentiation and improve the fruit setting rate, enabling Hainan Camellia oleifera to form flowers and bear fruits earlier and improving the flowering and fruit setting rate; 3. The present invention provides a method for increasing production and stabilizing yield through mixed planting of multiple excellent varieties and strains of Hainan oil-tea camellia. This method can be adopted in areas where Hainan oil-tea camellia can be planted. It can not only meet the production needs of mountain farmers for Hainan oil-tea camellia, but also improve the physical and chemical properties of the soil, increase the organic matter content in the soil, improve the standardized planting level of Hainan oil-tea camellia, and is easy to promote and apply. 4. In the tea oil refined from the Hainan oil-tea camellia planted by the present invention, the content of saturated fatty acids in the fatty acid composition is relatively low, and the content of unsaturated fatty acids is relatively high. When used by the human body, it is beneficial to cardiovascular health, is more easily metabolized, can regulate blood sugar, has antioxidant and anti-aging effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of mixed planting and intercropping of the present invention; Figure 2 It is a schematic diagram of mixed planting of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Example 1

[0015] S1, Woodland selection and soil preparation Select a hillside with an open terrain, good sun exposure, fertile, loose, less polluted soil, a certain slope and below 600m above sea level. When the soil thickness of the oil-tea camellia planting land reaches more than 80cm, the drainage effect of the planting land is relatively good. During reclamation, weeds and shrubs inside the area should be completely removed, and weeds and shrubs growing densely outside the area should also be removed. Deep plow the woodland to a depth of more than 40cm. Adopt the whole reclamation soil preparation method. According to the slope trend, arrange the ridge beds from top to bottom. Dig planting holes on the ridge beds with a row spacing of 4m and a plant spacing of 3m, and set the planting holes in adjacent rows in a staggered manner.

[0016] S2, Hole application of base fertilizer After digging the planting holes, after two months of drying, apply 25kg of cow dung into the planting holes in August and September, fill in the soil, and mix it evenly with the fertilizer to ensure that the depth of the planting hole after filling the soil is 45cm. This can not only ensure the fertility of the soil quality, but also effectively control the nutrient components in the soil, avoid nutrient loss, make the seedlings upright, give deep planting, and ensure the growth of the roots. During the young forest period of oil-tea camellia, fertilization work should be done well. The fertilizer is organic fertilizer. The fertilization time is usually in the spring of the current year, and the fertilization amount is about 20625kg / hm 2 or so.

[0017] S3, Planting of Camellia oleifera Seedlings Planting in October is easy to survive. Before planting Camellia oleifera seedlings, appropriate Camellia oleifera seedlings need to be selected according to the local climate, and then the planting positions of the seedlings are reasonably allocated according to the forest land design. On the forest land with sufficient base fertilizer, the hole spacing is 3m, and the depth of the Camellia oleifera planting hole is 45cm. After planting, pour enough root-fixing water. Water the seedlings every two days within one month after planting Camellia oleifera seedlings. After the seedlings survive, the watering time can be extended to once a week. During the process of planting Camellia oleifera, the staff should dig open the backfill soil in advance to allow the seedlings to have enough space to stretch. The roots of the seedlings should be covered with fine soil and compacted, and then the backfill soil is covered again to make it compact. Laying soil in layers can achieve good results and promote the combination of the seedling roots and the soil. After the seedlings are planted, water should be poured thoroughly at the roots in time to improve the survival rate of Camellia oleifera.

[0018] S4, Selection of Mixed Cultivation Varieties and Strains Ensure that the growth habits of Camellia oleifera varieties in the forest land are similar, and they have characteristics such as rapid growth, high yield, stable yield, excellent oil quality, and strong adaptability. When establishing the forest land of the base, select varieties that adapt to the climate of Qionghai and have similar flowering and fruiting periods, such as Dongsheng 1, Dongsheng 10, Dongsheng 20, Huishan 113, Haida 2, Haida 4, Boao 8, and Boao 11, and plant them alternately. As Figure 2 shown, 1, 2, 3, 4, 5, 6, 7, 8 respectively represent Dongsheng 1, Dongsheng 10, Dongsheng 20, Huishan 113, Haida 2, Haida 4, Boao 8, and Boao 11.

[0019] S5, Fertilizer Management Fertilize selectively according to the actual situation of the planting land. The fertilizers selected are compound fertilizers and organic fertilizers. The compound fertilizers can be applied by sprinkler irrigation, and the organic fertilizers can be farmyard manures such as pig manure, cow manure, and chicken manure; Dig holes at a position 20 - 30cm away from the roots of the seedlings and apply 50 - 100g of potassium sulfate compound fertilizer to ensure sufficient fertility. For later topdressing, apply by hole application, strip application, or ring application. Dig trenches around the vertical projection of the tree crown. The specifications of the trenches are 20cm × 30cm × 40cm. Mix the organic fertilizer with the topsoil and then cover and compact the soil. The trench-digging positions are staggered every year; Camellia oleifera may not need to be fertilized in the first year after planting. Start topdressing every year from the second year. Generally, topdress in spring, and apply 10 - 15kg per tree. If there is sufficient human resources, the method of applying less but more frequently can also be adopted, that is, reducing the single application amount and increasing the application frequency to ensure continuous and uniform supply of fertility; The number of fertilization times for Camellia oleifera varies from tree to tree. Fertilize after harvesting fruits in December, apply fruit-preserving fertilizer in March, and apply fruit-strengthening fertilizer in June. Applying more organic fertilizers can improve the site conditions, increase soil fertility, and promote high and stable yields of Camellia oleifera.

[0020] S6, Moisture management When the dry season comes, it is necessary to ensure the soil water content in the oil-tea camellia planting area and avoid the plants from withering and dying due to excessive water loss. Irrigation can be carried out about every 10 days to ensure survival in the first year. Since the oil-tea camellia is not tolerant to waterlogging, when entering the season with relatively more rain, in order not to let excessive rainwater accumulate at the roots of the oil-tea camellia, affecting the respiration of the roots, corresponding drainage work should be done to keep the air permeability of the roots and avoid economic losses caused by the rotting of the plant roots.

[0021] S7, Plant management The method of shaping is to cut the main stem about 0.4 m from the ground. Wait until new branches germinate, and then select 3 - 4 thick branches with different directions and about 10 cm up and down as the main branches. In the second year, add 2 - 3 more branches to each main branch and place them staggeredly. Then use the spring buds to cultivate secondary branch groups on the main and secondary branches, and prune scientifically and reasonably according to the ratio of "one stem, three branches, and nine tips" to make the root tip structure evenly distributed. The unused branches and densely germinated branches at the bottom of the main branch or main stem should be removed early. The configuration of the main branches and secondary branches of the oil-tea camellia needs to be uniform and reasonable to ensure good light transmittance of the crown; during the dormancy period, the pruning of the oil-tea camellia is mainly for shaping, cutting off the redundant branches and defective branches to reduce the consumption of nutrients and water. During the growth period, large-intensity pruning is not suitable, and mainly pruning methods such as pinching, bud rubbing, and sprouting removal are used.

[0022] S8, Pest and disease management The oil-tea camellia is vulnerable to the damage of the tea shoot moth, blue-winged longicorn, stem borer or termites. After being damaged by pests, the planters prune and prevent the diseased plants. When the oil-tea camellia breaks out with soft rot disease, the branches and leaves are pruned regularly, and at the same time, Bordeaux mixture and carbendazim chemical reagents with a long drug effect time and better effect are introduced. After the oil-tea camellia is damaged by the tea shoot moth, the diseased plants are pruned, and Bacillus thuringiensis is used for prevention, or prevention is carried out through insecticidal lamps. When being damaged by the stem borer, trichlorfon drugs are used for control. When being damaged by termites, the method of food trapping is used for prevention.

[0023] S9, Harvesting Around August every year, the oil-tea camellia fruits will gradually mature and can be picked by the end of October. After the oil-tea camellia fruits are mature, the harvesters complete the picking of the oil-tea camellia fruits between the Cold Dew seeds and the Frost's Descent seeds. If there are problems such as insect damage, rot, black spots, and white spots on the surface of the oil-tea camellia fruits, the fruits need to be removed in time. When picking, it is necessary to select fruits that are plump, have a uniform color, and a moderate hardness. The oil-tea camellia fruits showing grayish-brown or yellowish-brown represent maturity.

[0024] Table 1 Yield per single plant of different oil-tea camellia varieties

[0025] Table 2 Contents of Saturated Fatty Acids and Unsaturated Fatty Acids in Camellia oleifera Oil of Different Varieties

[0026] In summary, a method for increasing the yield and stability of multiple excellent varieties and strains of Hainan Camellia oleifera provided by the present invention, through a scientific and reasonable cultivation method of "forest land selection and site preparation, hole application of base fertilizer, planting of Camellia oleifera seedlings, selection of mixed varieties, fertilizer management, water management, plant management, pest and disease control, harvesting", mixes 8 different varieties and strains of Hainan Camellia oleifera. It can increase the density of pollen during the flowering period, and apply flower and fruit preservation fertilizers to promote flower bud differentiation and increase the fruit setting rate, enabling Hainan Camellia oleifera to flower and bear fruit earlier, increasing the flowering and fruit setting rate, and thus increasing the yield per plant of Hainan Camellia oleifera. At the same time, the content of saturated fatty acids in the fatty acid composition of the Camellia oleifera oil extracted from Hainan Camellia oleifera cultivated by the cultivation method of the present invention is relatively low, and the content of unsaturated fatty acids is relatively high. When used by the human body, it has the advantages of being beneficial to cardiovascular health, being more easily metabolized, regulating blood sugar, antioxidation, anti-aging, etc., and can provide a reference for the large-scale cultivation of Hainan Camellia oleifera.

[0027] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. As long as within the scope of the substantial spirit of the present invention, changes and modifications to the above-described embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for increasing production and stabilizing yield by mixed planting of multiple excellent varieties and strains of Hainan oil tea, characterized in that, It includes the following steps: S1, Woodland selection and soil preparation: Select a sloping land with an altitude ≤ 600m, open terrain, and good sun exposure. When reclaiming, remove weeds and shrubs on the sloping land, deeply plow the sloping land after removal, with a depth ≥ 40cm. Arrange the woodland from top to bottom according to the slope trend, dig planting holes at a row spacing of 4×3m, and set the planting holes in adjacent rows in a staggered manner; S2, Hole application of base fertilizer: Before planting Camellia oleifera, the base fertilizer is mainly decomposed organic fertilizer. In the early stage of root fixing, 25 kg of organic fertilizer is applied in the hole. Fertilization is carried out reasonably according to the principle of "applying thin fertilizer frequently", 3 - 5 times a year. During the young forest period of Camellia oleifera, organic fertilizer is applied. The fertilization time is in the spring of the current year, and the fertilization amount is 20625 kg / hm 2 ; S3, Planting of Camellia oleifera seedlings: Plant from October to March every year. On the woodland with sufficient base fertilizer applied, according to a hole spacing of 3m, the depth of the Camellia oleifera planting hole is 45cm. After planting, pour enough root-fixing water. Water the seedlings every two days within one month after planting; S4, Selection of mixed varieties and strains: Ensure that the growth habits of Camellia oleifera varieties and strains in the woodland are similar, and have characteristics such as rapid growth, high yield, stable yield, excellent oil quality, and strong adaptability. Select varieties and strains with similar phenological periods; S5, Fertilizer management: Dig a hole at a position 20 - 30cm away from the root of the seedlings and apply 50 - 100g of potassium sulfate compound fertilizer to ensure sufficient fertility. For later topdressing, use hole application, strip application, or ring application. Dig a ditch around the vertical projection of the tree crown, and the specifications of the ditch are 20cm×30cm×40cm. Mix the organic fertilizer with the topsoil and then cover and compact the soil. The digging positions of the ditches are staggered every year; S6, Water management: When the dry season comes, irrigate once every 10 days. When entering the rainy season, do a good job in drainage to keep the root permeability; S7, Plant management: Cut the main stem of Camellia oleifera 0.4m from the ground. When new branches germinate, select 3 - 4 thick branches with different directions and 10cm up and down as the main branches. In the second year, add 2 - 3 more branches to each main branch and place them staggeredly. Then use the spring buds to cultivate secondary branch groups on the main and secondary branches, and prune according to the ratio of "one stem, three branches, and nine tips" to make the root tip structure evenly distributed. Timely remove the unused branches and dense germinated branches at the bottom of the main branch or main stem. The main branches and secondary branches of Camellia oleifera are evenly configured to ensure good light transmittance of the tree crown. During the dormancy period, the pruning of Camellia oleifera is mainly for shaping, cutting off the redundant branches and bad branches to reduce the consumption of nutrients and water. During the growth period, large-intensity pruning is not suitable, and mainly use pinching, bud rubbing, and sprout removal pruning methods; S8, Pest and disease management: Camellia oleifera is vulnerable to the damage of tea shoot moths, blue-winged longhorn beetles, stem borers, or termites. After being damaged by pests, the planters prune and prevent the diseased plants.

2. A method for increasing production and stabilizing yield by mixed planting of multiple excellent varieties and strains of Hainan oil tea according to claim 1, characterized in that, In step S1, the sloping land has fertile, loose, less polluted, and gentle slopes, and the soil thickness of the Camellia oleifera planting land ≥ 80cm.

3. A method for increasing production and stabilizing yield by mixed planting of multiple excellent varieties and strains of Hainan oil-tea camellia according to claim 1, characterized in that, In step S2, after the planting holes are dug, after two months of drying, apply an appropriate amount of fertilizer to the planting holes in August and September, fill the planting holes with soil, and mix it evenly with the fertilizer to ensure that the depth of the planting holes after filling is 45cm.

4. A method for increasing production and stabilizing yield by mixed planting of multiple excellent varieties and strains of Hainan oil tea according to claim 1, characterized in that, In step S3, during the planting process of Camellia oleifera, dig open the backfill soil in advance, cover and compact the roots of the seedlings with fine soil, then cover the backfill soil again and compact it. After the seedlings are planted, water the roots thoroughly in time.

5. A method for increasing production and stabilizing yield by mixed planting of multiple excellent varieties and strains of Hainan oil tea according to claim 1, characterized in that, In step S4, select 8 excellent varieties with similar phenological periods and adaptable to the ecological conditions of the planting area, namely Dongsheng 1, Dongsheng 10, Dongsheng 20, Huishan 113, Haida 2, Haida 4, Boao 8, and Boao 11, for afforestation.

6. A method for increasing production and stabilizing yield by mixed planting of multiple excellent varieties and strains of Hainan oil-tea camellia according to claim 1, characterized in that, In step S5, fertilize after fruit harvesting in December, apply fruit retention fertilizer in March, and apply fruit enlargement fertilizer in June. Apply more organic fertilizers. Do not fertilize the oil tea in the first year after planting, and start topdressing every spring from the second year, adopting the method of applying small amounts but multiple times.

7. A method for increasing yield and stabilizing production by mixed planting of multiple excellent varieties and strains of Hainan oil-tea camellia according to claim 1, characterized in that, In step S7, apply flower and fruit retention fertilizer to increase the pollination probability of the oil tea. Prune the main stem of the oil tea, removing the branches below 20 cm. Prune the overbearing branches, cross branches, and overlapping branches. Prune the branches after fruit harvesting and fertilization in November every year. In the young age period of the oil tea, start pruning when it grows to 1 m in height. In the full fruit period, prune according to the pattern of thinning the inner cavity, shortening the top shoots, and controlling the tree crown. In the senescence period, prune to maintain the quality of the branches, buds, and leaves.

8. A method for increasing yield and stabilizing production by mixed planting of multiple excellent varieties and strains of Hainan oil tea according to claim 1, characterized in that, In step S8, when the oil tea suffers from soft rot disease, regularly prune the branches and leaves, and at the same time introduce Bordeaux mixture and carbendazim chemical reagents with a longer drug effect time and better effect. After the oil tea is damaged by the tea shoot moth, prune the diseased plants and prevent them with Bacillus thuringiensis or through insecticidal lamps. When damaged by the stem borer, use trichlorfon for prevention. When damaged by termites, use the method of food trapping for prevention.

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