Hormone and leaf surface boron fertilizer spraying method for improving fruit setting rate of macadamia nuts

Abstract

The invention belongs to the technical field of planting, and discloses a hormone and leaf surface boron fertilizer spraying method for improving the fruit setting rate of macadamia ternifolia, and the method comprises the following steps: spraying 0.02% boron fertilizer in the flower bud period of macadamia ternifolia; 2 mg / L 6-BA is sprayed in the full-bloom stage of the macadamia nuts; 0.02% of boron fertilizer and 0.2 ml / L of brassinolide are sprayed from the flowering period of the macadamia nuts to the initial fruit setting period. The 0.02% boron fertilizer is sprayed in the flower bud period of the macadamia nuts, so that the pollen viability and the flower quantity of the macadamia nuts are increased, and the fruit setting probability and the total fruit setting quantity in the later period are increased. According to the method, 2 mg / L 6-BA is sprayed at the full-bloom stage of the macadamia nuts, so that the flower falling rate is reduced, and the fruit setting rate is increased.

Description

Technical Field

[0001] The present invention belongs to, but is not limited to, the field of planting technology, and particularly relates to a method for spraying hormones and foliar boron fertilizers to improve the fruit setting rate of Macadamia nuts. Background Art

[0002] Macadamia nuts (Macadamia integrifolia Maiden & Betche) are native to Australia and belong to the genus Macadamia of the family Proteaceae, and are perennial evergreen trees, also known as Hawaiian nuts, Australian walnuts, etc. Macadamia nuts are rich in nutrients, including soluble sugars, proteins, unsaturated fatty acids, etc., and have the functions of regulating human blood lipids, improving blood circulation, reducing cardiovascular diseases, enhancing memory, etc., and are a health food with extremely high nutritional value. Macadamia nuts are known as the "king of dried fruits" due to their extremely high economic value and are also regarded as one of the most valuable cash crops in the world. The commercial cultivation history of Macadamia nuts is only more than 150 years. It was first commercially planted in Hawaii and was introduced to southern China for commercial planting in the 1990s, and has developed rapidly in Yunnan and Guangxi, and is also widely planted in areas such as Guangdong. Currently, China has become the country with the largest planting area of Macadamia nuts, and Yunnan is the largest province in China for planting Macadamia nuts. However, in production, there are problems of large flower quantity but low fruit setting rate and serious fruit drop in Macadamia nuts in China. Currently, the fruit setting rate of Macadamia nuts is only 0.1% - 0.5%, and the unit area yield of Macadamia nuts in China is much lower than that in Australia.

[0003] To improve the fruit setting rate of Macadamia nuts, a lot of attention and research have been paid to the technology of protecting flowers and fruits of Macadamia nuts. Current research includes the exploration of the physiological fruit drop law of Macadamia nuts, the influence of pollination parents and pollination methods on Macadamia nuts, measures such as hormones and fertilization to reduce fruit drop of Macadamia nuts, the influence of water on fruit drop of Macadamia nuts, etc. Technical measures for protecting flowers and fruits have been obtained from aspects such as basal water and fertilizer management and artificial pollination. However, currently, most of the field management technologies are too extensive, lacking quantitative data for reference, and the cost of artificial pollination and the difficulty of technology implementation are relatively high.

[0004] Research shows that plant hormones have an obvious effect on the growth and development of plants and the regulation of fruit setting. Improving the fruit setting rate by spraying hormones and foliar fertilizers can not only reduce costs but also reduce the implementation difficulty, but there is currently no perfect spraying plan. Currently, in production, a single hormone or foliar fertilizer is mostly sprayed without difference throughout the growth period. This spraying method not only lacks theoretical and practical data basis and does not fully consider the demand characteristics of different growth periods of Macadamia nuts, but also has a poor effect on protecting flowers and fruits. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a method for spraying hormones and foliar boron fertilizers to improve the fruit setting rate of Macadamia integrifolia.

[0006] The present invention is implemented as follows. A method for spraying hormones and foliar boron fertilizers to improve the fruit setting rate of Macadamia integrifolia includes:

[0007] S1. Spraying 0.02% boron fertilizer during the flower bud stage of Macadamia integrifolia;

[0008] S2. Spraying 2 mg / L 6-BA during the full bloom stage of Macadamia integrifolia;

[0009] S3. Spraying 0.02% boron fertilizer and 0.2 ml / L brassinolide from the flower withering stage to the initial fruit setting stage of Macadamia integrifolia.

[0010] Furthermore, the specific steps of S1 include:

[0011] When the inflorescence of Macadamia integrifolia has germinated and the small flowers present as unopened green flower buds, prepare 0.02% boron fertilizer and spray it: add 0.2 g boric acid to every 1 L of water, and the active ingredient content of boric acid > 99%. Otherwise, effective ingredient conversion is required. Store the prepared solution in a knapsack sprayer and spray the whole tree. If the volume of the pesticide sprayer is 20 L, add 4 g boric acid and mix it evenly with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

[0012] Furthermore, the specific steps of S2 include:

[0013] When all the small flowers of Macadamia integrifolia are in full bloom, prepare 2 mg / L 6-BA and spray it: add 2 mg 6-BA to every 1 L of water, and the active ingredient content of 6-BA > 99%. Otherwise, effective ingredient conversion is required. Store the prepared solution in a knapsack sprayer and spray the whole tree. If the volume of the pesticide sprayer is 20 L, add 40 mg 6-BA and mix it evenly with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

[0014] Furthermore, the specific steps of S3 include:

[0015] When most of the small flowers of Macadamia integrifolia have withered and there is a small amount of initial fruit setting, prepare a mixed solution of 0.02% boron fertilizer + 0.2 ml / L brassinolide and spray it: add 0.2 ml brassinolide and 0.2 g boric acid to every 1 L of water, and the active ingredient content of both > 99%. Otherwise, effective ingredient conversion is required. Store the prepared solution in a knapsack sprayer and spray the whole tree. If the volume of the pesticide sprayer is 20 L, add 4 g boric acid and 4 ml brassinolide and mix it evenly with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

[0016] Combined with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by the present invention are as follows:

[0017] First, by spraying 0.02% boron fertilizer during the flower bud stage of macadamia nuts, the present invention increases the pollen viability and flower quantity of macadamia nuts, and improves the fruit setting probability and total fruit setting quantity in the later stage.

[0018] By spraying 2 mg / L 6-BA during the full bloom stage of macadamia nuts, the present invention reduces the flower dropping rate and increases the fruit setting rate.

[0019] By spraying 0.02% boron fertilizer and 0.2 ml / L brassinolide from the flower withering stage to the initial fruit setting stage of macadamia nuts, the present invention reduces fruit drop and increases the final fruit setting rate.

[0020] The present invention reduces the labor and material costs required for flower and fruit preservation, has a low implementation difficulty in the field, has a good effect on flower and fruit preservation, and has a good application prospect.

[0021] The present invention is environmentally friendly and safe. Compared with the extensive use of chemical agents and complex pollination and pruning management, the agents used in the present invention are relatively environmentally friendly and safe and have a low dosage, which is beneficial to green production.

[0022] Second, by optimizing the foliar application strategy and systematically regulating the coordination relationship between reproductive growth and vegetative growth, the present invention significantly improves the fruit setting rate of macadamia nuts. Based on the preliminary data of plot experiments and field promotion, the fruit setting rate has increased by 23.6%, driving the single plant yield to increase by about 20.9%. From the perspective of economic benefit calculation, the increase in output per unit area has led to an annual increase in the per capita income of fruit farmers of more than 20%, especially in pollination-sensitive varieties and marginal plots. This technical solution has good popularizability and adaptability, can be replicated on a large scale in the main production areas of macadamia nuts, is expected to significantly increase the overall economic output value of the industrial chain, and indirectly drive the development of supporting industries such as agricultural materials, plant protection, and agricultural machinery services.

[0023] For a long time, there has been a lack of precise regulation measures for the flower organ differentiation mechanism and nutrient distribution dynamics of macadamia nuts in the regulation of fruit setting rate, and there has been no systematic study on the application model of the combined action of foliar hormones and trace elements internationally. Existing research mostly stays in the stage of single-factor stimulation or empirical spraying, lacking a systematic integration plan based on the regulation of plant hormone signal pathways and the regulation mechanism of enzyme activity mediated by trace nutrient elements. By constructing a precise foliar spraying system with the compounding of exogenous gibberellin (GA3), cytokinin (6-BA) and boron element, the present invention establishes for the first time an intervention chain of "fruit setting physiological disorder - hormone and nutrient intervention - yield increase", filling the technical gap in the regulation of fruit setting rate of macadamia nuts at home and abroad.

[0024] The low fruit - setting rate of Macadamia integrifolia is caused by the combined action of multiple factors such as low pollen activity, poor fertilization efficiency, and poor ovary development. Moreover, traditional pollination - promoting measures (such as artificial supplementary pollination and bee - attracting pollination) have practical bottlenecks such as high cost, short effectiveness, and susceptibility to climate interference. The present invention focuses on two core physiological nodes: enhancing pistil fertility and inhibiting early ovule degeneration. By using the synergistic effect of hormones and boron, it enhances the assimilation intensity of carbon source distribution to fruits, improves the integrity of ovary development after flowering, and fundamentally improves the fruit - setting success rate. This solution realizes the simultaneous intervention of multiple obstacle factors and effectively overcomes the technical bottleneck that has long troubled the Macadamia integrifolia industry.

[0025] Traditional fertilization and plant growth regulation strategies mostly use single - hormone or single - nutrient intervention, ignoring the synergistic regulation role of the interaction mechanism between hormone signal networks and mineral nutrition in fruit development, and not fully considering the biological characteristics of Macadamia integrifolia flowers and fruits, such as cross - pollination mechanism, flower organ differentiation cycle, and the process of source - sink relationship reconstruction. The present invention breaks the technical inertia of "single - factor intervention can improve fruit - setting", adopts a "hormone + boron fertilizer" synergistic strategy, intervenes in the fruit development process from multiple dimensions of source strength improvement, storage capacity regulation, and signal coordination, and proposes a new paradigm for constructing medicament combinations and application windows based on crop physiological characteristics, providing a theoretical basis and practical path for improving the fruit - setting rate of tropical woody crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of the method for spraying hormones and foliar boron fertilizer to improve the fruit - setting rate of Macadamia integrifolia provided by the embodiments of the present invention;

[0027] Figure 2 is the pollen viability and the number of flowers per inflorescence provided by the embodiments of the present invention, A: pollen viability, B: the number of flowers per inflorescence;

[0028] Figure 3 is the initial fruit - setting amount per inflorescence and the fruit - setting rate provided by the embodiments of the present invention, A: the initial fruit - setting amount per inflorescence, B: the initial fruit - setting rate

[0029] Figure 4 is the fruit - dropping rate during the first fruit - dropping period provided by the embodiments of the present invention;

[0030] Figure 5 is the final number of fruits set per inflorescence and the final fruit - setting rate provided by the embodiments of the present invention, A: the final number of fruits set per inflorescence, B: the final fruit - setting rate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] AsFigure 1 As shown in Figure 1 , an embodiment of the present invention provides a method for spraying hormones and foliar boron fertilizers to improve the fruit setting rate of Macadamia integrifolia, and the method includes:

[0033] S1, spraying 0.02% boron fertilizer during the flower bud stage of Macadamia integrifolia;

[0034] S2, spraying 2 mg / L 6-BA during the full bloom stage of Macadamia integrifolia;

[0035] S3, spraying 0.02% boron fertilizer and 0.2 ml / L brassinolide from the flower withering stage to the initial fruit setting stage of Macadamia integrifolia.

[0036] Spraying 0.02% boron fertilizer during the flower bud differentiation stage of Macadamia integrifolia aims to enhance the early construction ability of flower organs. As a bridging factor in the pectin structure of the cell wall, boron promotes the stable division and elongation of apical meristem cells. Sufficient supply of boron can significantly improve the integrity of flower bud cell membranes and the adhesiveness of the cell interstitium, avoiding flower organ malformation or abortion caused by boron deficiency, and providing a stable organ basis for subsequent flowering and fertilization processes.

[0037] Applying boron during the flower bud stage can also activate key enzyme systems such as polyphenol oxidase and phosphatase, promote sugar accumulation and organic acid metabolism in flower buds, enhance the nutrient accumulation rate, and thus enhance the vitality and quantity of flower buds. Boron also indirectly affects the auxin distribution pattern by participating in the regulation of IAA (auxin) transporter proteins, induces the initiation of reproductive growth, and reduces the risk of flower bud degradation caused by nutrient competition.

[0038] Spraying 2 mg / L 6-BA (6-benzylaminopurine) during the full bloom stage of Macadamia integrifolia mainly aims to delay the senescence of flower organs, improve pollen activity, and extend the stigma receptivity through cytokinin-like hormones. 6-BA can activate the expression of Cyclin protein and CDK complex, thereby promoting the continuous division of anther wall and ovule cells, delaying the initiation of apoptosis program, and contributing to improving the overall fertilization success rate.

[0039] 6-BA also has a positive regulatory effect on the source-sink relationship. It can improve the activities of photosynthesis-related enzymes (such as Rubisco, PEPC) in leaves, enhance the carbon assimilation rate, and at the same time up-regulate the expression levels of SWEET sugar transporter and SUT sucrose transporter, promoting the active transport of photosynthetic products such as sucrose to newly formed ovaries and young fruits, providing sufficient energy and structural material support for fruit setting.

[0040] Spray a compound solution of 0.02% boron fertilizer + 0.2 ml / L brassinolide in the late stage of flower withering to the initial stage of young fruit formation, forming a functional complementarity between plant hormones and trace elements. As a steroid hormone, brassinolide can enhance the anti-apoptosis ability of ovule cells, promote the cell expansion rate, and at the same time act on the expression pathways of cell wall extension proteins and expansins together with boron elements, improving the fertility and developmental stability of ovary tissues.

[0041] Brassinolide can improve the signal response environment of ovule cells in the initial stage of fruit setting by upregulating the expression of key genes in the BR signaling pathway such as BZR1 and DWF4, and synergistically reduce the concentration of endogenous abscisic acid (ABA) in plants, inhibiting early embryo degeneration. This process plays a key role in enhancing the ovary maintenance ability and reducing physiological fruit drop.

[0042] The demand for boron elements increases sharply during the cell division and ovule nuclear division activities in the initial stage of fruit setting. Boron improves the accuracy of the mitosis process by stabilizing the microtubule structure and nuclear membrane complex at this stage, and at the same time inhibits the programmed cell death induced by DNA breakage, providing structural and metabolic guarantees for the normal embryonic development of fruits.

[0043] By implementing differential intervention measures at different development stages, a dynamic regulation system of "building organs in the early stage, ensuring pollination in the middle stage, and promoting fruit setting in the later stage" is formed, coordinating the spatio-temporal synergy of nutrient element supply and hormone signal transduction. This integrated strategy not only improves the fruit set rate, but also optimizes the energy and resource allocation efficiency during the growth cycle of fruit trees, achieving a systematic breakthrough in the yield bottleneck of Macadamia integrifolia at the physiological mechanism level.

[0044] The specific content of S1 includes:

[0045] Prepare 0.02% boron fertilizer and spray it when the inflorescence of Macadamia integrifolia has germinated and the small flowers present unopened green flower buds: add 0.2 g of boric acid to every 1 L of water, and the active ingredient content of boric acid > 99%, otherwise effective ingredient conversion is required. Store the prepared solution in a knapsack sprayer for full-tree spraying. If the volume of the pesticide sprayer is 20 L, 4 g of boric acid needs to be added to it and mixed with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

[0046] The specific content of S2 includes:

[0047] Prepare 2 mg / L 6-BA and spray it when all the small flowers of Macadamia integrifolia are open: add 2 mg of 6-BA to every 1 L of water, and the active ingredient content of 6-BA > 99%, otherwise effective ingredient conversion is required. Store the prepared solution in a knapsack sprayer for full-tree spraying. If the volume of the pesticide sprayer is 20 L, 40 mg of 6-BA needs to be added to it and mixed with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

[0048] The specific steps of S3 are as follows:

[0049] When most of the small flowers of Macadamia integrifolia wither and a small amount of initial fruit setting occurs, prepare a mixed solution of 0.02% boron fertilizer + 0.2 ml / L brassinolide and spray it: add 0.2 ml of brassinolide and 0.2 g of boric acid to every 1 L of water, and the active ingredients are both > 99%. Otherwise, the active ingredient conversion is required. Store the prepared solution in a knapsack pesticide sprayer and spray the whole tree. For example, if the volume of the pesticide sprayer is 20 L, add 4 g of boric acid and 4 ml of brassinolide to it and mix well with water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

[0050] Note: In production, this technology can be manually sprayed using a knapsack pesticide sprayer, or mechanically sprayed using a pesticide spraying vehicle or spraying pipeline. It should be noted that the medicament should be evenly sprayed in a spray form on the whole plant.

[0051] Table 1 Spraying Scheme

[0052]

[0053] I. Specific application fields or related products of the present invention

[0054] Application fields:

[0055] 1. Cultivation and production of Macadamia integrifolia: The present invention can be applied to Macadamia integrifolia orchards to improve the fruit setting rate of Macadamia integrifolia and increase the yield.

[0056] 2. Agricultural research institutions: Research institutions can use the present invention as a research case for further in-depth research to provide more technical support for agricultural production.

[0057] Related products: Macadamia integrifolia fruit products, related hormone and boron fertilizer pesticide products.

[0058] II. Relevant evidence of the technical effects obtained in the embodiments of the present invention

[0059] (1) Experimental plan: The experiment was carried out in Lujiangba, Baoshan City, Yunnan Province. 24 A4 macadamia trees of the same variety and similar growth were selected to set up an experimental group and a control group. The control group was sprayed with water, and the experimental group was sprayed with 20mg / L CPPU, 20mg / L GA3, 20mg / L NAA, 0.02% boron fertilizer, 0.2ml / L brassinolide, 2mg / L 6-BA, and a mixed solution of all the above solutions (20mg / L CPPU+20mg / L GA3+20mg / L NAA+0.02% boron fertilizer+0.2ml / L brassinolide+2mg / L6-BA), with 3 trees in each treatment. The reagents were sprayed directly on the flower spikes, once at the beginning of flowering, once at the peak of flowering, and once at the young fruit formation period (after flowering), for a total of 3 sprays.

[0060] After spraying the agent, indices such as inflorescence development, pollen vitality, initial fruit setting rate, and final number of fruits were measured.

[0061] (2) Test results:

[0062] During the flowering period of macadamia nuts, spraying boron fertilizer has the highest effect on improving pollen vitality, which can increase pollen vitality by 95.69% compared with the control group ( Figure 2 A); Spraying brassinolide increased the number of flowers per inflorescence the most, increasing the number of flowers per inflorescence by 26.37% compared with the control group ( Figure 2 B);

[0063] In the early stage of macadamia fruit setting, spraying of pesticides led by CPPU and 6-BA can significantly increase the initial fruit setting amount and initial fruit setting rate per inflorescence. Among them, the fruit setting rate of spraying CPPU increased by 211.48% compared with the control group, and the fruit setting rate of spraying 6-BA increased by 170.77% compared with the control group ( Figure 3 AB);

[0064] The first batch of macadamia fruit drop peaked 4 weeks after the initial fruit setting. During this period, GA3, brassinolide, and boron fertilizer treatments had the best fruit retention effects, and their fruit drop rates were reduced by 28.82%, 27.70%, and 26.55% respectively compared with the water treatment. Figure 4 ).

[0065] At the fruit ripening and harvesting period, the treatment with the highest number of fruits per inflorescence and the highest final fruit setting rate was the 6-BA treatment, whose final fruit setting rate was 476% higher than that of the water treatment, followed by the brassinolide treatment ( Figure 5 AB).

[0066] Combined with the test results, in the flower bud stage of Macadamia integrifolia, 0.02% boron fertilizer was sprayed to improve pollen viability and flower quantity; in the full bloom stage, 2 mg / L 6-BA was sprayed to improve the fruit setting rate; from the full bloom stage to the initial fruit setting stage, 0.02% boron fertilizer and 0.2 ml / L brassinolide were sprayed to reduce fruit drop and improve the final fruit setting rate.

[0067] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A method for spraying hormones and foliar boron fertilizers to improve the fruit setting rate of macadamia nuts, characterized in that, The method includes: S1. Spraying borate fertilizer with a mass concentration of 0.02% during the flower bud differentiation period of Macadamia integrifolia; S2. Spraying a 6-benzylaminopurine (6-BA) solution with a concentration of 2 mg / L during the full bloom period of Macadamia integrifolia; S3. Spraying a mixed solution of 0.02% borate fertilizer and 0.2 ml / L brassinolide from the late stage of flower withering to the initial fruit setting stage of Macadamia integrifolia.

2. The method according to claim 1, wherein The borate fertilizer sprayed in S1 is boric acid, with the mass fraction of its active ingredient being greater than 99%. It is sprayed on the whole tree using a sprayer, and 0.2 g of boric acid is added to every 1 L of water to prepare the spraying solution.

3. The method according to claim 1, characterized in that The spraying time of S1 is when the inflorescence of Macadamia integrifolia first appears and the small flowers are green and the flower buds are not yet open.

4. The method according to claim 1, characterized in that The 6-BA used in S2 is a high-purity preparation. 40 mg of 6-BA is added to every 20 L of the spraying solution, and it is sprayed on the whole tree using a knapsack pesticide sprayer.

5. The method according to claim 1, wherein In the mixed solution sprayed in S3, 0.2 g of boric acid and 0.2 ml of brassinolide are added to every 1 L of water. After preparation, it is mixed evenly for use. Every 20 L of the spraying solution is used to spray 6 Macadamia integrifolia fruit trees with a height of 4 - 5 meters.

6. The method according to claim 1, characterized in that, The above spraying operations are all carried out during the period when the leaf humidity is high and the transpiration rate is low in the early morning or evening, so as to avoid the volatilization and invalidation of the liquid medicine or the occurrence of phytotoxicity in the environment of strong sunlight and high temperature.

7. The hormone and foliar boron fertilizer spraying method for improving the fruit setting rate of Macadamia integrifolia according to claim 1, characterized in that, Specifically, S1 includes: When the inflorescence of Macadamia integrifolia has germinated and the small flowers present as unopened green flower buds, prepare 0.02% borate fertilizer and spray it: add 0.2 g of boric acid to every 1 L of water, and the active ingredient of boric acid > 99%. Otherwise, the active ingredient conversion is required. Store the prepared solution in a knapsack pesticide sprayer and spray it on the whole tree. For example, if the volume of the pesticide sprayer is 20 L, 4 g of boric acid needs to be added to it and mixed evenly with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

8. The hormone and foliar boron fertilizer spraying method for improving the fruit setting rate of Macadamia integrifolia as described in claim 1, characterized in that, Specifically, S2 includes: When all the small flowers of Macadamia integrifolia are in bloom, prepare 2 mg / L 6-BA and spray it: add 2 mg of 6-BA to every 1 L of water, and the content of the active ingredient of 6-BA > 99%. Otherwise, the active ingredient conversion is required. Store the prepared solution in a knapsack pesticide sprayer and spray it on the whole tree. For example, if the volume of the pesticide sprayer is 20 L, 40 mg of 6-BA needs to be added to it and mixed evenly with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

9. The hormone and foliar boron fertilizer spraying method for improving the fruit setting rate of macadamia nuts according to claim 1, characterized in that, Specifically, S3 includes: When most of the small flowers of Macadamia integrifolia have withered and there is a small amount of initial fruit setting, prepare a mixed solution of 0.02% borate fertilizer + 0.2 ml / L brassinolide and spray it: add 0.2 ml of brassinolide and 0.2 g of boric acid to every 1 L of water, and the active ingredients of both are > 99%. Otherwise, the active ingredient conversion is required. Store the prepared solution in a knapsack pesticide sprayer and spray it on the whole tree. For example, if the volume of the pesticide sprayer is 20 L, 4 g of boric acid and 4 ml of brassinolide need to be added to it and mixed evenly with clear water. Every 20 L of the medicament can spray 6 fruit trees with a height of 4 - 5 m.

Images