A stage nutrient formula for mango root layer regulation and application method

Abstract

The present application provides a kind of stage nutrient formula and application method for mango root layer regulation, the stage nutrient formula includes sprout promoting fertilizer, flower promoting fertilizer, fruit strengthening fertilizer, organic fertilizer, water retaining agent is ditched in the soil in fertilization ditch and is mixed uniformly in sprout promoting period, other fertilizer is dissolved in water in sprout promoting period, flower promoting period, fruit strengthening period respectively, water and fertilizer integration is connected with drip irrigation mouth by fine tube, and water and fertilizer are introduced into fertilization ditch uniformly, brown algae oligosaccharide is added when irrigating each time.The stage nutrient formula and application method of the present application are used for mango root layer regulation, which significantly improves orchard soil environment, improves mango quality and yield while reducing production cost and improving economic benefit.

Description

Technical Field

[0001] This invention relates to the field of mango cultivation technology, and in particular to a staged nutrient formula and application method for mango root layer regulation. Background Technology

[0002] Mangoes are an important commercial fruit tree in tropical and subtropical regions. They are one of the oldest fruit trees in cultivation, and are loved by many for their high sweetness, high nutritional value, and good taste.

[0003] In recent years, there have been many problems with fertilizer waste in mango planting and production, such as excessive fertilizer use and low fertilizer utilization. This not only affects economic benefits but also places a great burden on the soil environment, resulting in poor tree growth, poor disease resistance, and difficulty in guaranteeing mango yield and quality.

[0004] Plant growth and development are inextricably linked to root growth. Root zone regulation measures can control root growth, promote the biological effects of roots and their absorption and utilization of nutrients, thereby affecting the growth and development of the above-ground parts of the plant and improving fertilizer utilization. Therefore, developing root zone regulation methods that can improve fertilizer utilization and the quality and yield of mangoes has become an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the present invention proposes a staged nutrient formula and application method for mango root layer regulation, thereby solving the above problems.

[0006] The technical solution of this invention is implemented as follows:

[0007] A staged nutrient formula for mango root layer regulation, comprising: shoot-promoting fertilizer, flower-promoting fertilizer, and fruit-enlarging fertilizer;

[0008] The fertilizer for promoting shoot growth includes organic fertilizer, water-retaining agent, urea, potassium sulfate, borax, magnesium sulfate, and brown algae oligosaccharides;

[0009] The fertilizer for promoting shoot growth includes urea, potassium sulfate, borax, magnesium sulfate, and alginic oligosaccharides;

[0010] The fruit-enhancing fertilizer includes urea, potassium sulfate, borax, magnesium sulfate, and brown algae oligosaccharides;

[0011] Furthermore, the N:P2O5:K2O mass ratio in the shoot-promoting fertilizer is 1:0.5-0.7:1.1-1.4, the N:K2O mass ratio in the flower-promoting fertilizer is 1:0.9-1.5, the N:K2O mass ratio in the fruit-enlarging fertilizer is 1:0.9-1.5, and the total N:P2O5:K2O mass ratio for the three periods is 1:0.2-0.3:1-1.5.

[0012] Furthermore, the total mass ratio of urea, potassium sulfate, borax, and magnesium sulfate in the three stages of shoot-promoting fertilizer, flower-promoting fertilizer, and fruit-enlarging fertilizer is 3:4:3.

[0013] Furthermore, the water-retaining agent is polyacrylamide; its water absorption ratio is 365, and before absorbing water, it is dark gray and irregularly granular.

[0014] A method for applying a staged nutrient formula for mango root layer regulation includes the following steps:

[0015] Dig a fertilization trench at the drip line of the mango tree; the fertilization trench is the root zone for root regulation.

[0016] During the shoot-promoting period, apply organic fertilizer and water-retaining agent in furrows and mix them with the soil in the furrows. Mix other fertilizers with water and introduce them evenly into the furrows using a water-fertilizer integration method. Add brown algae oligosaccharides each time you irrigate.

[0017] During the flowering and fruit-enlarging periods, the flowering fertilizer and fruit-enlarging fertilizer are mixed with water and introduced evenly into the fertilization trench in an integrated water and fertilizer system. Brown algae oligosaccharides are added each time the fertilizer is applied.

[0018] Furthermore, the fertilization trench consists of two symmetrical fertilization trenches, each measuring 100cm in length, 30cm in width, and 20cm in depth.

[0019] Furthermore, the amount of organic fertilizer applied during the shoot-promoting period is 1009.18–1514.00 kg·hm². -2 The total fertilizer application rate during the shoot-promoting period is 43.20–48.12 kg·hm² N. -2 P2O5 21.43~32.40kg·hm -2 K2O 46.88~70.32kg·hm -2 .

[0020] Furthermore, the total fertilizer application rate during the flowering induction period is 34.48–37.03 kg·hm² N. -2 K2O 34.93~52.39kg·hm -2 .

[0021] Furthermore, the total fertilizer application rate during the fruit-setting period is 25.21–27.77 kg·hm² N. -2 K2O 26.19~39.29kg·hm -22 .

[0022] Furthermore, the integrated water and fertilizer system uses a thin tube connected to the drip irrigation port to evenly introduce water and fertilizer into the fertilization trench; specifically, each tree is surrounded by a ring pipe with 8 drip irrigation ports evenly opened, and the water and fertilizer are evenly introduced into the fertilization trench by connecting the drip irrigation ports with a thin tube. The amount of water applied each time is 25 liters, and 25g of brown algae oligosaccharide is added each time.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) The present invention provides a staged nutrient formula and application method for mango root layer regulation, which can improve the physical properties (soil bulk density, moisture, field water holding capacity and soil porosity), chemical properties (soil pH, organic matter content, soil available nitrogen, available phosphorus and available potassium content) and soil enzyme activity of mango root layer soil.

[0025] (2) Bio-organic fertilizer has low density, large volume, and high porosity. When applied to the soil, it directly reduces soil bulk density. Simultaneously, the rich nutrients in bio-organic fertilizer promote plant root growth and soil microbial activity, indirectly reducing soil bulk density and increasing the diversity of soil bacteria and fungi, as well as the richness of dominant bacterial groups, thus enhancing the vitality of mango tree roots. Water-retaining agents improve soil water retention performance, increase soil water use efficiency, and provide the necessary humidity conditions for microorganisms, thereby accelerating the reproduction and long-term colonization of beneficial microorganisms. Alginate has enzyme-like catalytic activity, meaning it can mimic the action of enzymes, promoting biochemical reactions and catalyzing the decomposition of organic matter in organic fertilizers by soil microorganisms, accelerating the release of nutrients available for plant use. Drip irrigation through specific fertilization furrows ensures that crop roots consistently absorb adequate water and nutrients during growth, maintaining soil moisture, improving fertilizer utilization, reducing environmental pressure, and providing a simpler and faster method.

[0026] (3) This invention achieves its effects through synergistic nutrient formula, brown algae oligosaccharide, fertigation, and drip irrigation of specific fertilization trenches. It can improve the nutrient utilization rate of mango tree roots, promote the absorption of nutrients by mango trees, improve the soil environment of the orchard, enhance the quality and yield of mangoes, reduce production costs, and improve economic benefits. Detailed Implementation

[0027] To better understand the technical content of this invention, specific embodiments are provided below to further illustrate the invention.

[0028] Unless otherwise specified, the experimental methods used in the embodiments of this invention are all conventional methods.

[0029] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0030] Example 1

[0031] The selected experimental plants mature once a year, with one year constituting one production cycle. The nitrogen application rate for each production cycle is 108.00 kg·hm². -2 The phosphorus pentoxide content is 30 kg·hm². -2 The amount of potassium oxide is 130 kg·hm. -2The planting spacing is 4m × 5m, the variety is Tainong No. 1, and the trees are 20 years old. The organic fertilizer used is Nangbowang bio-organic fertilizer (produced by Jiangsu Jiangyin Lianye Biotechnology Co., Ltd.), with a nitrogen content of 1.53%, a P2O5 content of 2.12%, and a K2O content of 2.05%. The water-retaining agent is polyacrylamide, with a water absorption ratio of 365, and is dark gray and irregularly granular before water absorption.

[0032] Nutritional formulas for different stages:

[0033] Shoot-promoting fertilizer: Before the fruit trees sprout new shoots, apply 2826.00g of organic fertilizer, 101.00g of water-retaining agent, 112.80g of urea, 125.06g of potassium sulfate, 30.00g of borax, 45.00g of magnesium sulfate, and 25.00g of alginic oligosaccharide per tree, containing N: 95.04g, P2O5: 60.00g, K2O: 108.26g, with N:P2O5:K2O = 1:0.6:1.1.

[0034] Flowering fertilizer: Before flowering, apply 150.40g of urea and 154.80g of potassium sulfate per plant, along with 40.00g of borax, 60.00g of magnesium sulfate, and 25.00g of alginic oligosaccharide, containing 69.18g of N and 86.71g of K2O, with an N:K2O ratio of 1:1.2.

[0035] Fruit-enlarging fertilizer: During the rapid fruit expansion period, apply 112.80g of urea, 116.10g of potassium sulfate, 30.00g of borax, 45.00g of magnesium sulfate, and 25.00g of alginic oligosaccharides per plant, containing 51.88g of N and 65.03g of K2O, with an N:K2O ratio of 1:1.2.

[0036] The overall N:P2O5:K2O ratio for the three periods was 1:0.28:1.2.

[0037] Application method:

[0038] Dig two symmetrical fertilization trenches at the drip line of the mango tree, each 100cm long, 30cm wide, and 20cm deep. These trenches are the root zone for root regulation.

[0039] During the shoot-promoting stage: Organic fertilizer and water-retaining agent are applied in furrows and mixed evenly with the soil in the fertilization furrows. The amount of organic fertilizer applied is 1413.07 kg·hm². -2 The application rate of water-retaining agent is 50.00 kg·hm². -2 Dissolve other fertilizers in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, with 25.00g of fucoidan added each time. The total fertilizer application during the shoot-promoting period is: N 47.52 kg·hm². -2P2O5 30.00 kg·hm -2 K2O 55.71 kg·hm -2 .

[0040] Flower induction period: Dissolve fertilizer in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip irrigation points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, with 25g of fucoidan added each time. The total fertilizer application during the flower induction period is 35.27 kg·hm² N. -2 K2O 42.45 kg·hm -2 .

[0041] During the fruit-enlarging stage: Dissolve the fertilizer in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip irrigation points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, and 25.00g of fucoidan is added with each irrigation. The total fertilizer application during the fruit-enlarging stage is 25.21 kg·hm² N. -2 K2O 31.84 kg·hm -2 .

[0042] The total fertilizer application rate for the three periods was N: 108.00 kg·hm² -2 P2O5: 30.00 kg·hm -2 K2O: 130.00 kg·hm -2 .

[0043] Example 2

[0044] The selected experimental plants mature once a year, with one year constituting one production cycle. The nitrogen application rate for each production cycle is 108.00 kg·hm². -2 The phosphorus pentoxide content is 32.40 kg·hm². -2 The potassium oxide content is 162.00 kg·hm². -2 The planting spacing is 4m × 5m, the variety is Tainong No. 1, and the trees are 20 years old. The organic fertilizer used is Nangbowang bio-organic fertilizer (produced by Jiangsu Jiangyin Lianye Biotechnology Co., Ltd.), with a nitrogen content of 1.53%, a P2O5 content of 2.12%, and a K2O content of 2.05%. The water-retaining agent is polyacrylamide, with a water absorption ratio of 365, and is dark gray and irregularly granular before water absorption.

[0045] Nutritional formulas for different stages:

[0046] Shoot-promoting fertilizer: Before the fruit trees sprout new shoots, apply 3027.85g of organic fertilizer, 101.00g of water-retaining agent, 110.67g of urea, 151.12g of potassium sulfate, 30.00g of borax, 45.00g of magnesium sulfate, and 25.00g of alginic oligosaccharide per tree, containing N: 97.23g, P2O5: 64.19g, K2O: 139.97g, with N:P2O5:K2O = 1:0.7:1.4.

[0047] Flowering fertilizer: Before flowering, apply 147.56g of urea and 201.51g of potassium sulfate per plant, along with 40.00g of borax, 60.00g of magnesium sulfate, and 25.00g of alginic oligosaccharide, containing 67.88g of N and 105.18g of K2O, with an N:K2O ratio of 1:1.5.

[0048] Fruit-enlarging fertilizer: During the rapid fruit expansion period, apply 110.67g of urea, 151.12g of potassium sulfate, 30.00g of borax, 45.00g of magnesium sulfate, and 25.00g of alginic oligosaccharides per plant, containing 50.91g of N and 78.88g of K2O, with an N:K2O ratio of 1:1.5.

[0049] The overall N:P2O5:K2O ratio for the three periods was 1:0.3:1.5.

[0050] Application method:

[0051] Dig two symmetrical fertilization trenches at the drip line of the mango tree, each 100cm long, 30cm wide, and 20cm deep. These trenches are the root zone for root regulation.

[0052] During the shoot-promoting stage: Organic fertilizer and water-retaining agent are applied in furrows and mixed evenly with the soil in the furrows. The amount of organic fertilizer applied is 1514.00 kg·hm². -2 The application rate of water-retaining agent is 50.00 kg·hm². -2 Dissolve other fertilizers in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, with 25.00g of fucoidan added each time. The total fertilizer application during the shoot-promoting period is: N 48.12 kg·hm². -2 P2O5 32.4 kg·hm -2 K2O 70.32 kg·hm -2 .

[0053] Flower induction period: Dissolve fertilizer in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip irrigation points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, with 25.00g of fucoidan added each time. The total fertilizer application during the flower induction period is 34.48 kg·hm² N. -2K2O 52.39 kg·hm -2 .

[0054] During the fruit-enlarging stage: Dissolve the fertilizer in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, and 25.00g of fucoidan is added with each irrigation. The total fertilizer application during the fruit-enlarging stage is 25.40kg·hm² N. -2 K2O 39.29 kg·hm -2 .

[0055] The total fertilizer application rate for the three periods was N: 108.00 kg·hm² -2 P2O5: 32.40 kg·hm -2 K2O: 162.00 kg·hm -2 .

[0056] Example 3

[0057] The selected experimental plants mature once a year, with one year constituting one production cycle. The nitrogen application rate for each production cycle is 108.00 kg·hm². -2 The phosphorus pentoxide content was 21.60 kg·hm². -2 The amount of potassium oxide is 108.00 kg·hm. -2 The planting spacing is 4m × 5m, the variety is Tainong No. 1, and the trees are 20 years old. The organic fertilizer used is Nangbowang bio-organic fertilizer (produced by Jiangsu Jiangyin Lianye Biotechnology Co., Ltd.), with a nitrogen content of 1.53%, a P2O5 content of 2.12%, and a K2O content of 2.05%. The water-retaining agent is polyacrylamide, with a water absorption ratio of 365, and is dark gray and irregularly granular before water absorption.

[0058] Nutritional formulas for different stages:

[0059] Shoot-promoting fertilizer: Before the fruit trees sprout new shoots, apply 2018.57g of organic fertilizer, 101.00g of water-retaining agent, 120.74g of urea, 100.75g of potassium sulfate, 30.00g of borax, 45.00g of magnesium sulfate, and 25.00g of alginic oligosaccharide per tree, containing N: 86.42g, P2O5: 42.79g, K2O: 93.77g, with N:P2O5:K2O = 1:0.5:1.1.

[0060] Flowering fertilizer: Before flowering, apply 160.99g of urea and 134.34g of potassium sulfate per plant, along with 40.00g of borax, 60.00g of magnesium sulfate, and 25.00g of alginic oligosaccharide, containing 76.06g of N and 69.86g of K2O, with an N:K2O ratio of 1:0.9.

[0061] Fruit-enlarging fertilizer: During the rapid fruit expansion period, apply 120.74g of urea, 100.75g of potassium sulfate, 30.00g of borax, 45.00g of magnesium sulfate, and 25.00g of alginic oligosaccharides per plant, containing 55.54g of N, 52.39g of K2O, with an N:K2O ratio of 1:0.9.

[0062] The overall N:P2O5:K2O ratio for the three periods was 1:0.2:1.

[0063] Application method:

[0064] Dig two symmetrical fertilization trenches at the drip line of the mango tree, each 100cm long, 30cm wide, and 20cm deep. These trenches are the root zone for root regulation.

[0065] During the shoot-promoting stage: Organic fertilizer and water-retaining agent are applied in furrows and mixed evenly with the soil in the furrows. The amount of organic fertilizer applied is 1009.18 kg·hm². -2 The application rate of water-retaining agent is 50.00 kg·hm². -2 Dissolve other fertilizers in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, with 25.00g of fucoidan added each time. The total fertilizer application during the shoot-promoting period is: N 43.20 kg·hm². -2 P2O5 21.43 kg·hm -2 K2O 46.88 kg·hm -2 .

[0066] Flower induction period: Dissolve fertilizer in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip irrigation points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, with 25.00g of fucoidan added each time. The total fertilizer application during the flower induction period is 37.03 kg·hm² N. -2 K2O 34.93 kg·hm -2 .

[0067] During the fruit-enlarging stage: Dissolve the fertilizer in water. For each tree, create eight evenly spaced drip irrigation points around the tree using a circular pipe. Connect the drip irrigation points with thin tubing to evenly distribute the water and fertilizer into the fertilization trench. Each irrigation uses 25 liters of water, and 25.00g of fucoidan is added with each irrigation. The total fertilizer application during the fruit-enlarging stage is 27.77 kg·hm² N. -2 K2O 26.19 kg·hm -2 .

[0068] The total fertilizer application rate for the three periods was N: 108.00 kg·hm² -2 P2O5: 21.60 kg·hm -2K2O: 108.00 kg·hm -2 .

[0069] Comparative Example 1 (Traditional Fertilization Method)

[0070] The selected experimental plants mature once a year, with one year constituting one production cycle. The nitrogen application rate for each production cycle is 108.00 kg·hm². -2 The phosphorus pentoxide content is 30 kg·hm². -2 The amount of potassium oxide is 130 kg·hm. -2 The spacing between plants is 4m × 5m, the variety is Tainong No. 1, and the trees are 20 years old.

[0071] Nutritional formulas for different stages:

[0072] Shoot-promoting fertilizer: Before the fruit trees sprout new shoots, apply 141.00g of urea, 36.00g of potassium dihydrogen phosphate, 126.00g of potassium sulfate, 30.00g of borax, and 45.00g of magnesium sulfate per tree. The proportions are: N: 64.80g, P2O5: 18.00g, K2O: 78.00g, with a ratio of N:P2O5:K2O = 1:0.28:1.2.

[0073] Flowering fertilizer: Before flowering, apply 188.00g of urea, 48.00g of potassium dihydrogen phosphate, and 168.00g of potassium sulfate per plant, along with 40.00g of borax and 60.00g of magnesium sulfate. The ratio of N:P2O5:K2O is 1:0.28:1.2.

[0074] Fruit-enlarging fertilizer: During the rapid fruit expansion period, apply 141.00g of urea, 36.00g of potassium dihydrogen phosphate, 126.00g of potassium sulfate, 30.00g of borax, and 45.00g of magnesium sulfate per plant, with N: 64.80g, P2O5: 18.00kg, K2O: 78.00g, and N:P2O5:K2O = 1:0.28:1.2.

[0075] Application method:

[0076] Apply fertilizer in a circular trench along the tree canopy drip line, mixing it thoroughly with the soil in the trench. Cover with fine soil and fallen leaves after application. The total fertilizer application rate for the three periods is N: 108.00 kg·hm². -2 P2O5: 30.00 kg·hm -2 K2O: 130.00 kg·hm -2 .

[0077] Comparative Example 2

[0078] The difference between Comparative Example 2 and Example 1 is that the brown algae oligosaccharide is replaced with amino oligosaccharide, while the other nutrient formulations and application methods are the same as in Example 1.

[0079] Comparative Example 3

[0080] The difference between Comparative Example 3 and Example 1 is that the brown algae oligosaccharide is replaced with chitosan oligosaccharide, while the other nutritional formulations and application methods are the same as in Example 1.

[0081] The experimental orchard is located at 18°24′N, 108°39′E, with a tropical monsoon oceanic climate. The rainy and dry seasons are distinct, with the rainy season concentrated from April to August. The average annual temperature is 24.5℃, the annual precipitation is around 1500 mm, and the annual sunshine duration is approximately 2000 hours.

[0082] Comparison of soil physical properties in Experiment Example 1:

[0083] Table 1. Comparison of soil physical properties under different treatments

[0084]

[0085] Experimental results showed that soil treated with the staged nutrient formula of this invention had a 13.17% higher soil moisture content, an 18.14% higher field capacity, and a 14.38% higher capillary porosity compared to soil treated with traditional fertilization methods. The staged nutrient formula of this invention for mango root layer regulation improved the physical properties of the soil. In Comparative Examples 2 and 3, replacing the fucoidan with amino oligosaccharides and chitosan oligosaccharides significantly reduced the effects compared to Example 1.

[0086] Comparison of soil chemical properties in Experiment Example 2:

[0087] Table 2. Comparison of soil chemical properties under different treatments

[0088]

[0089] The experimental results show that soils fertilized with the nutrient formula of this invention exhibit 620% higher organic matter, 90.91% higher available nitrogen, 83.52% higher available phosphorus, and 21.42% higher available potassium compared to traditional fertilization methods. This invention significantly improves the chemical properties of the soil. Comparative Examples 2 and 3 showed higher levels of residual organic matter, and significantly lower N, P, and K content compared to Example 1. This indicates that the fucoidan possesses enzyme-like catalytic activity, mimicking the action of enzymes to promote biochemical reactions, catalyzing the decomposition of organic matter in organic fertilizers by soil microorganisms, and accelerating the release of nutrients available for plant use.

[0090] Experimental Example 3: Enzyme Activity Test in Soil

[0091] Table 3. Enzyme activity tests in soil under different treatments

[0092]

[0093] The experimental results showed that the soil treated with the nutrient formula of this invention exhibited a 119.68% increase in urease, a 56.93% increase in sucrase, a 79.80% increase in catalase, and a 28.44% increase in phosphatase compared to traditional fertilization methods. This indicates that the nutrient formula of this invention can improve enzyme activity in the soil and enhance the soil environment. In Comparative Examples 2 and 3, replacing the brown alginic oligosaccharide with amino oligosaccharides and chitosan oligosaccharides significantly reduced enzyme activity compared to Example 1.

[0094] Experiment Example 4: Measurement of Root Diameter of Mango Plants

[0095] Table 4. Measurement of root diameter of mango plants

[0096]

[0097] The experimental results show that using the staged nutrient formula and application method for mango root layer regulation according to the present invention can make the mango plant roots stronger, with the average root diameter increasing by 24.26% in the second year compared to the first year, while traditional fertilization methods showed no improvement. The staged nutrient formula and application method of the present invention can effectively regulate root growth and promote the biological effects of the roots and the absorption and utilization of nutrients. In Comparative Example 3, the average root diameter of the plant did not increase in the second year compared to the first year, while in Comparative Example 2, the average root diameter increased by 16.13% in the second year compared to the first year, which was lower than that of Example 1.

[0098] Experimental Example 5: Test of Soluble Sugar Content in Mango

[0099] Table 5. Test of soluble sugar content in mangoes

[0100] Comparative Example 1 13.70 Comparative Example 2 15.16 Comparative Example 3 14.86 Example 1 16.95

[0101] The experimental results show that the soluble sugar content of mangoes produced using the staged nutrient formula and application method of this invention for mango root layer regulation is 23.71% higher than that of fruits produced by fruit trees using traditional fertilization methods. In Comparative Examples 2 and 3, the soluble sugar content of mangoes decreased compared to Example 1 after replacing the fucoidan with amino oligosaccharides and chitosan oligosaccharides. The staged nutrient formula and application method of this invention can improve fruit quality, resulting in fruits with higher soluble sugar content and better taste.

[0102] Experimental Example 6: Determination of various nutritional indicators

[0103] Total nitrogen in the fruit was determined by wet ashing-Nessler's reagent colorimetric method; total potassium in the fruit was determined by dry ashing-flame photometry method.

[0104] Table 6. Determination of Nutritional Indicators of Mango

[0105] Comparative Example 1 6.16 4.19 Comparative Example 2 6.84 8.06 Comparative Example 3 6.41 7.16 Example 1 7.04 9.45

[0106] Experimental results show that mangoes grown using the staged nutrient formula and application method for mango root layer regulation of this invention produce mangoes with a 14.29% higher total nitrogen content and a 125.54% higher total potassium content compared to mangoes grown using traditional fertilization methods. Applying the staged nutrient formula of this invention for mango root layer regulation can improve fertilizer utilization in Tainong mangoes, reduce waste during fertilization, lower costs, and avoid damage to the soil environment caused by excessive fertilization. In Comparative Examples 2 and 3, replacing the fucoidan with amino oligosaccharides and chitosan oligosaccharides significantly reduced the effects compared to Example 1.

[0107] Experiment Example 7: Determination of Mango Yield Indicators

[0108] Table 7. Mango Yield Indicators Measurement

[0109]

[0110] The results of this experiment show that using the staged nutrient formula and application method for mango root layer regulation according to the present invention can increase mango yield by 38.58%. Traditional fertilization methods, such as trench fertilization in mango orchards, have low fertilizer utilization rates, resulting in insufficient fertilizer absorption by the trees, low yields, significant fertilizer waste, increased planting costs, and low economic benefits. Applying the staged nutrient formula of the present invention can significantly increase mango yield. Compared with existing fertilization formulas and methods, the staged nutrient formula and application method for mango root layer regulation of the present invention increases the agronomical utilization rate of effective nutrients in mangoes by 94.3%. In Comparative Examples 2 and 3, replacing the fucoidan with amino oligosaccharides and chitosan oligosaccharides significantly reduced the agronomical utilization rate of effective nutrients compared to Example 1.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stage-specific nutrient formula for mango root layer regulation, characterized in that: include: Shoot-promoting fertilizer, flower-promoting fertilizer, and fruit-enlarging fertilizer; The fertilizer for promoting shoot growth includes organic fertilizer, water-retaining agent, urea, potassium sulfate, borax, magnesium sulfate, and brown algae oligosaccharides; The flower-inducing fertilizer includes urea, potassium sulfate, borax, magnesium sulfate, and alginic oligosaccharides; The fruit-enhancing fertilizer includes urea, potassium sulfate, borax, magnesium sulfate, and brown algae oligosaccharides; The water-retaining agent is polyacrylamide; Application method of the stage-specific nutrient formula for mango root layer regulation: Dig a fertilizer trench at the drip line of the mango tree; During the shoot-promoting period, apply organic fertilizer and water-retaining agent in furrows and mix them with the soil in the furrows. Mix other fertilizers with water and introduce them evenly into the furrows using a water-fertilizer integration method. Add brown algae oligosaccharides each time you irrigate. During the flowering and fruit-enlarging periods, the flowering fertilizer and fruit-enlarging fertilizer are mixed with water and introduced evenly into the fertilization trench in an integrated water and fertilizer system. Brown algae oligosaccharides are added each time the fertilizer is applied.

2. The staged nutrient formula for mango root layer regulation according to claim 1, characterized in that: The N:P2O5:K2O mass ratio in the shoot-promoting fertilizer is 1:0.5~0.7:1.1~1.4, the N:K2O mass ratio in the flower-promoting fertilizer is 1:0.9~1.5, the N:K2O mass ratio in the fruit-enlarging fertilizer is 1:0.9~1.5, and the total N:P2O5:K2O mass ratio for the three periods is 1:0.2~0.3:1~1.

5.

3. The staged nutrient formula for mango root layer regulation according to claim 1, characterized in that: The total mass of urea, potassium sulfate, borax, and magnesium sulfate is in the following ratios for the three stages: shoot-promoting fertilizer, flower-promoting fertilizer, and fruit-enlarging fertilizer: 3:4:

3.

4. The staged nutrient formula for mango root layer regulation according to claim 1, characterized in that: The fertilization trench consists of two symmetrical trenches, each measuring 100 cm in length, 30 cm in width, and 20 cm in depth.

5. A staged nutrient formula for mango root layer regulation according to claim 1, characterized in that: The amount of organic fertilizer applied during the shoot-promoting period is 1009.18~1514.00 kg·hm². -2 The total fertilizer application rate during the shoot-promoting period is 43.20~48.12 kg·hm² N. -2 P2O5 21.43~32.4 0 kg·hm -2 K₂O 46.88~70.32 kg·hm -2 .

6. The staged nutrient formula for mango root layer regulation according to claim 1, characterized in that: The total fertilizer application rate during the flowering induction period was 34.48~37.03 kg·hm² N. -2 K₂O 34.93~52.39 kg·hm -2 .

7. The staged nutrient formula for mango root layer regulation according to claim 1, characterized in that: The total fertilizer application rate during the fruit-setting period was 25.21~27.77 kg·hm² N. -2 K₂O 26.19~39.29 kg·hm -2 .

8. A staged nutrient formula for mango root layer regulation according to claim 1, characterized in that: The integrated water and fertilizer system uses a thin pipe connected to the drip irrigation inlet to evenly introduce water and fertilizer into the fertilization trench. Specifically, a ring pipe is used to encircle each tree, with 8 drip irrigation inlets evenly opened. The thin pipe is connected to the drip irrigation inlet to evenly introduce water and fertilizer into the fertilization trench. The amount of water applied each time is 25 liters, and 25g of brown algae oligosaccharide is added each time.

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