Radish adult plant seed reproduction method

Abstract

The invention relates to the technical field of radish breeding. The invention provides a radish adult plant seed reproduction method which comprises the following steps: (1) sowing radishes, carrying out primary screening before fleshy roots of the radishes are mature, carrying out secondary screening after the fleshy roots of the radishes are mature, and then cutting off part of leaves of the radishes to obtain seed plants; (2) applying an organic fertilizer and a compound fertilizer into the soil, performing deep ploughing, performing ridging, digging planting holes in ridge surfaces, and transplanting seed plants; (3) spraying chlormequat chloride in the squaring stage of the seed plants, and then carrying out topping treatment on the seed plants; (4) performing daily field management; and (5) harvesting radish seeds. The method provided by the invention has a remarkable effect on improving the seed reproduction and production yield of the radish adult-plant method, and has great significance. The radish seed plants are subjected to a series of treatment through a scientific and reasonable seed reproduction method, field management in the flowering phase of the seed plants is enhanced, and the yield of radish adult-plant seed reproduction is improved under the condition that the quality of radish seeds is guaranteed by combining the measures of inserting rods and surrounding ropes, releasing bees and pollinating and the like.

Description

Technical Field

[0001] This invention relates to the field of radish propagation technology, and in particular to a method for propagating mature radish plants. Background Technology

[0002] Seeds are the "chips" of agriculture, and seed breeding plays a vital role in agricultural production, genetic resource protection, economic benefits, and ecological adaptability. The breeding of radish seeds can protect radish germplasm resources and genetic diversity, and is also a key link in seed industry innovation, ecological agriculture, and increasing farmers' income.

[0003] Radish propagation methods can be divided into mature plant seed collection, semi-mature plant seed collection, and small plant seed collection. The main differences lie in the screening and identification of radish traits during the seed selection period and the maturity of the fleshy root. In the mature plant seed collection method, radish plants undergo multiple screenings and are marked individually during the critical period for identifying varietal characteristics, ensuring that the characteristics of each growth stage of the radish in the field conform to the typicality of the variety. During the maturity period of the radish fleshy root, strict identification of the radish root type is used to remove impurities and inferior plants, ensuring the purity of the variety and maximizing the preservation of typical varieties, resulting in high-quality and reliable seeds. In the semi-mature plant seed collection method, because the radish fleshy root has not fully expanded, the varietal characteristics are not fully expressed, and the selection of plants cannot be fully carried out, easily leading to the mixing of plants with low purity, thus causing varietal mixing and seed degeneration. In the small plant seed collection method, radishes are directly sown without strict plant selection, and seeds are harvested after flowering and pod formation. After many years of implementation, the radish traits are easily mixed, and the variety degenerates.

[0004] Therefore, to improve the quality of radish seeds, it is advisable to use the mature plant seed collection method, but the seed production yield of this method needs to be further improved. Summary of the Invention

[0005] The purpose of this invention is to provide a method for propagating radish seed plants from mature plants. Through technological innovation in the process of propagating radish seed plants from mature plants, the seed production of radish seed plants is increased.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for propagating mature radish plants, comprising the following steps: (1) Sow radishes, conduct the first screening before the radish fleshy root matures, conduct the second screening after the radish fleshy root matures, and then cut off some of the radish leaves to obtain seed plants; (2) Apply organic fertilizer and compound fertilizer to the soil, plow deeply and then make ridges, dig planting holes on the ridges and transplant the seedlings; (3) Spray chlormequat chloride during the budding stage of the seed plants, and then top the seed plants and spray foliar fertilizer. (4) Conduct routine field management; (5) Harvest radish seeds.

[0007] As a preferred option, the criteria for the initial screening in step (1) are: removing diseased and weak seedlings during the critical periods such as the seedling stage and the early stage of fleshy root growth, and removing radish plants that do not conform to the characteristics of the original variety based on leaf shape, leaf color and other traits; the criteria for the secondary screening are: selecting seed plants that are free from pests and diseases, undamaged and large in size; when cutting, retain 5-10cm long radish greens and cut off the rest.

[0008] As a preferred embodiment, the organic matter content of the organic fertilizer in step (2) is ≥50%, and the application rate is 100~200 kg / mu; the application rate of the compound fertilizer is 15~20 kg / mu; the depth of deep plowing is 15~20 cm; the ridge height is 20~25 cm, the ridge width is 30~40 cm, the furrow width is 35~45 cm, the ridge spacing is 70~75 cm, the spacing of the planting holes is 35~40 cm, and the transplanting of seedlings is based on the standard that the soil does not cover the radish heart leaves and the fleshy roots do not expose the shoulders, and watering is done once after transplanting.

[0009] Preferably, the land mentioned in step (2) is land in a greenhouse, the width of which is 6~10m and the length is 35~45m; after transplanting the seedlings, a rainproof shed is added to the top of the greenhouse, and an insect-proof net is installed under the greenhouse.

[0010] Preferably, the spraying time in step (3) is 8-10 am on a sunny day. When spraying, spray the radish flower buds and surrounding leaves evenly until the leaves are moist but not dripping. The chlormequat chloride is a 45-55% aqueous solution with a concentration of 550-650 mg / L. The topping treatment is performed one week after spraying the chlormequat chloride and before spraying the foliar fertilizer. The topping method is to remove all flowering and non-flowering flower buds at the top of the main stem of the plant.

[0011] As a preferred option, the daily field management described in step (4) includes fertilizer and water management, inter-row cultivation and weeding, pole planting and rope enclosure, bee pollination, and pest and disease control; The method of fertilizer and water management is as follows: After the seedlings bolt, apply potassium sulfate compound fertilizer at a standard of 8-12 kg / mu. At the early flowering stage, apply potassium dihydrogen phosphate by diluting it with 15 kg of water at a standard of 60-90 g / mu. Stop topdressing and control water during the pod-setting period. If the soil is relatively dry at this time, water once.

[0012] Preferably, the method of weeding and cultivating is to cultivate 1 to 2 times before the seedlings bolt and flower; The method of inserting poles and tying ropes is as follows: In the early flowering stage of the seedlings, insert a bamboo pole 1-1.4m high along the ridge, from the beginning to the end of the ridge, at intervals of 4-6m. When the radish plants reach a height of 40-50cm, tie the first rope around the radish plants on both sides of the ridge, and tie a knot at each bamboo pole. As the radishes grow and the plant height increases, tie a second rope about 35-45cm above the first rope, and tie a knot at each bamboo pole to fix the radish stem.

[0013] As a preferred method, the bee pollination method is as follows: at the early flowering stage of the seed plants, place one beehive 4-6m from the entrance of the greenhouse, with the beehive 50-80cm above the ground, and place 10,000-15,000 bees in each beehive, with the entrance and exit of the beehive facing south.

[0014] As a preferred method, the pest and disease control methods are as follows: for downy mildew, spray with 80% mancozeb wettable powder at a dilution of 500-700 times; for sclerotinia rot, spray with 75% chlorothalonil wettable powder at a dilution of 500-800 times; for aphids, spray with 10% imidacloprid wettable powder at a dilution of 2400-2600 times; and for cabbage caterpillars, spray with 4.5% lambda-cypermethrin emulsifiable concentrate at a rate of 30-50 ml / acre.

[0015] Preferably, the time for harvesting radish seeds in step (5) is early June.

[0016] This invention provides a method for propagating radish seedlings from mature plants, comprising the following steps: (1) sowing radishes, performing initial screening before the radish fleshy roots mature, performing secondary screening after the radish fleshy roots mature, and then removing some of the radish leaves to obtain seedlings; (2) applying organic fertilizer and compound fertilizer to the soil, deep plowing and ridging, digging planting holes on the ridges, and transplanting the seedlings; (3) spraying chlormequat chloride during the budding stage of the seedlings, and then topping the seedlings; (4) performing routine field management; and (5) harvesting radish seeds. This invention is significantly effective in increasing the yield of radish seedlings propagated from mature plants and is of great significance. This invention uses a scientific and reasonable propagation method to treat radish seedlings in a series of ways, strengthens field management during the flowering period of the seedlings, and combines measures such as stake planting, rope enclosure, and bee pollination to increase the yield of radish seedlings propagated from mature plants while ensuring the quality of radish seeds.

[0017] This invention involves spraying a plant growth regulator (PDG) during the budding stage of radish seed plants, when the height of the central radish shoot is roughly equal to the height of the outer leaves. This shortens the internodes of the plant, thickens the stems, and promotes the reproductive growth of the radish. Combined with measures such as topping the radish seed plants and spraying foliar fertilizer, the seed production is increased, resulting in high-quality radish seeds with a yield increase of more than 6% compared to conventional seed propagation. Attached Figure Description

[0018] Figure 1 This is the flow chart of the method of the present invention. Detailed Implementation

[0019] This invention provides a method for propagating mature radish plants, comprising the following steps: (1) Sow radishes, conduct the first screening before the radish fleshy root matures, conduct the second screening after the radish fleshy root matures, and then cut off some of the radish leaves to obtain seed plants; (2) Apply organic fertilizer and compound fertilizer to the soil, plow deeply and then make ridges, dig planting holes on the ridges and transplant the seedlings; (3) Spray chlormequat chloride during the budding stage of the seed plants, and then top the seed plants and spray foliar fertilizer. (4) Conduct routine field management; (5) Harvest radish seeds.

[0020] In this invention, the criteria for the initial screening in step (1) are: removing diseased and weak seedlings during the critical period of radish seedling stage and early growth of fleshy roots, and removing radish plants that do not conform to the characteristics of the original variety in combination with leaf shape, leaf color and other traits; the criteria for the secondary screening are: screening for seed plants that are free from pests and diseases, undamaged and large in size; when cutting, retain 5-10cm long radish greens and cut off the rest.

[0021] In this invention, the organic fertilizer mentioned in step (2) is Yiyushe brand biological organic fertilizer (animal protein fertilizer) produced by Qingdao Kangtuwodi Agricultural Technology Co., Ltd., with organic matter ≥50%. The preferred application rate is 100-200 kg / mu, more preferably 150 kg / mu; the compound fertilizer is Walter brand potassium sulfate compound fertilizer produced by Hubei Yuanfeng Chemical Co., Ltd., and the preferred application rate is 15-20 kg / mu, more preferably 17-18 kg / mu; the preferred depth of deep plowing is 15-20 cm, more preferably 17-18 cm; when ridging, the preferred ridge height is 20-25 cm, ridge width is 30-40 cm, furrow width is 35-45 cm, and ridge spacing is 70-75 cm, more preferably ridge height is 22-23 cm, ridge width is 35 cm, furrow width is 40 cm, and ridge spacing is 72-73 cm; the preferred spacing of the planting holes is 35-40 cm, more preferably 37-38 cm; when transplanting the seedlings, the soil should not cover the radish heart leaves and the fleshy roots should not be exposed; water once after transplanting.

[0022] In this invention, the land mentioned in step (2) is preferably land in a greenhouse, the width of the greenhouse is preferably 6~10m, more preferably 8m, and the length is preferably 35~45m, more preferably 40m; after transplanting the seedlings, it is preferable to cover the top of the greenhouse with a rainproof shed and install an insect-proof net under the greenhouse.

[0023] In this invention, the preferred time for spraying in step (3) is 8-10 am on a sunny day, more preferably 9 am. When spraying, the radish flower buds and surrounding leaves are sprayed evenly until the leaves are moist but not dripping. The preferred chlormequat chloride is a 45-55% aqueous solution, more preferably a 50% aqueous solution. The preferred concentration of chlormequat chloride is 550-650 mg / L, more preferably 600 mg / L. The preferred time for topping is one week after spraying chlormequat chloride and before spraying foliar fertilizer. The preferred method for topping is to remove all flowering and non-flowering flower buds at the top of the main stem of the plant.

[0024] In this invention, the daily field management described in step (4) preferably includes fertilizer and water management, inter-row cultivation and weeding, pole planting and rope enclosure, bee pollination, and pest and disease control; The preferred method for fertilizer and water management is as follows: after the seedlings bolt, apply potassium sulfate compound fertilizer at a rate of 8-12 kg / mu; at the early flowering stage, apply potassium dihydrogen phosphate foliar spray at a rate of 60-90 g / mu diluted in 15 kg of water; stop topdressing and control water during the pod-setting stage; if the soil is relatively dry at this time, water once. A further preferred method is: after the seedlings bolt, apply potassium sulfate compound fertilizer at a rate of 10 kg / mu; at the early flowering stage, apply potassium dihydrogen phosphate foliar spray at a rate of 75 g / mu diluted in 15 kg of water.

[0025] In this invention, the preferred method of weeding and cultivating is to cultivate 1-2 times before the seedlings bolt and flower; The preferred method of inserting poles and using ropes is as follows: At the initial flowering stage of the radish plants, insert a bamboo pole 1-1.4m high along the ridge, from the beginning to the end of the ridge, at intervals of 4-6m. When the radish plants reach a height of 40-50cm, enclose the first rope along both sides of the ridge next to the radish plants, tying a knot at each bamboo pole. As the radishes grow and the plants become taller, enclose a second rope approximately 35-45cm above the first rope, again tying a knot at each bamboo pole to secure the radish stem. A further preferred method is: At the initial flowering stage of the radish plants, insert a bamboo pole 1.2m high along the ridge, from the beginning to the end of the ridge, at intervals of 5m. When the radish plants reach a height of 45cm, enclose the first rope along both sides of the ridge next to the radish plants, tying a knot at each bamboo pole. As the radishes grow and the plants become taller, enclose a second rope approximately 40cm above the first rope, again tying a knot at each bamboo pole to secure the radish stem.

[0026] In this invention, the preferred method of bee pollination is as follows: at the early flowering stage of the seed plants, place one beehive 4-6m from the entrance of the greenhouse, with the beehive 50-80cm above the ground, and place 10,000-15,000 bees in each beehive, with the entrance and exit of the beehive facing south, which is even more preferred.

[0027] In this invention, the preferred methods for controlling pests and diseases are: spraying downy mildew with 80% mancozeb wettable powder at a dilution of 500-700 times; spraying sclerotinia rot with 75% chlorothalonil wettable powder at a dilution of 500-800 times; spraying aphids with 10% imidacloprid wettable powder at a dilution of 2400-2600 times; and spraying cabbage caterpillars with 4.5% high-efficiency cypermethrin emulsifiable concentrate at a rate of 30-50 ml / mu. More preferably, the methods are: spraying downy mildew with 80% mancozeb wettable powder at a dilution of 600 times; spraying sclerotinia rot with 75% chlorothalonil wettable powder at a dilution of 600-700 times; spraying aphids with 10% imidacloprid wettable powder at a dilution of 2500 times; and spraying cabbage caterpillars with 4.5% high-efficiency cypermethrin emulsifiable concentrate at a rate of 40 ml / mu.

[0028] In this invention, the preferred time for harvesting radish seeds in step (5) is early June.

[0029] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0030] Example 1: Propagation of Huangzhou radish using the mature plant method as an example

[0031] I. Study on treatment with different concentrations of chlormequat chloride

[0032] 1. Materials and Methods

[0033] (1) Test materials

[0034] The experimental radish variety was Huangzhou radish, and the material was obtained from the Huanggang Academy of Agricultural Sciences. The tested chlormequat chloride was a 50% aqueous solution produced by Sichuan Runer Technology Co., Ltd.

[0035] (2) Experimental design

[0036] The experiment was designed with 5 treatments, randomized block design, and three replicates. Each plot was 2.5 m wide and 5 m long, with a plot area of ​​12.5 m². 2 The control group (CK) was sprayed with water (treatment 1). The concentrations of chlormequat chloride (chlormequat chloride) were 200 mg / L for treatment 2, 400 mg / L for treatment 3, 600 mg / L for treatment 4, and 800 mg / L for treatment 5. Chlormequat chloride was sprayed once on a sunny morning between 8 and 10 am when the radish buds were at the budding stage (when the height of the central radish shoot was roughly equal to the height of the outer leaves). The spray was applied evenly to the radish buds and surrounding leaves, ensuring the leaves were moist but not dripping. Other field management practices (plant topping and foliar fertilizer application, etc.) were the same for all treatments. When the seed pods matured, eight radish plants with relatively uniform growth were selected from each plot for seed weight measurement. The experiment was conducted at the Huanggang Agricultural Science and Technology Demonstration Park.

[0037] (3) Measurement indicators

[0038] Harvesting and surveying were conducted on June 8th. Traits such as the number of pods per radish plant and seed yield per plant were recorded.

[0039] 2. Results and Analysis

[0040] Table 1. Radish seed production yield under different treatments

[0041] Seed yield is an important indicator of whether the concentration of chlormequat chloride (chlormequat chloride) treatment is appropriate. Chlormequat chloride can inhibit the biosynthesis of endogenous gibberellins, thereby delaying cell elongation and dwarfing the plant. Chlormequat chloride can improve the water absorption capacity of the root system and significantly affect the accumulation of proline in the plant, which is beneficial to improving the plant's resistance to stresses, such as drought resistance, cold resistance, salt and alkali resistance, and disease resistance.

[0042] Chlormequat chloride, an artificial plant growth regulator, can inhibit the biosynthesis of glycogen, reduce competition for nutrients during flower bud germination, and at appropriate concentrations, shorten internodes, thicken stems, darken leaves, and increase leaf volume. The efficacy of chlormequat chloride increases with dosage, but excessive concentrations or dosages can cause phytotoxicity, mainly manifested as stunted growth, curled, dark green, and deformed leaves. The results of this experiment show that treatment with 600 mg / L chlormequat chloride can increase the seed yield of Huangzhou radish, is simple, convenient, and low-cost, and increases seed yield by 6.5% compared to the control.

[0043] Example 2: Experimental Study on the Effect of Organic Fertilizer on the Main Economic Traits of Huangzhou Radish

[0044] Huangzhou radishes, grown using 200 kg of bio-organic fertilizer + 20 kg of compound fertilizer (Walter brand potassium sulfate compound fertilizer) per mu, exhibited the following results: plant height 46.8 cm, plant width 68.8 cm, leaf length 43.5 cm, leaf width 15.3 cm, root diameter 8.3 cm, and root length 11.2 cm. The highest yield was 2920.1 kg, an increase of 626.2 kg compared to the control, representing a yield increase of 27.3%. In terms of quality, it contained 0.7 g / 100g crude fiber, 4.2 g / 100g soluble sugar, and 92.6 g / 100g moisture. See the experiment details below.

[0045] Four different treatments were set up: Treatment 1: 200 kg of bio-organic fertilizer + 20 kg of NPK compound fertilizer per mu; Treatment 2: 200 kg of inactivated bio-organic fertilizer + 20 kg of NPK compound fertilizer per mu; Treatment 3: Conventional fertilization: 200 kg of cake fertilizer + 20 kg of NPK compound fertilizer per mu; Treatment 4: No fertilization (blank control). The results showed that Treatment 1 had the highest yield of 2920.1 kg per mu. In terms of quality, it had 0.7 g / 100g crude fiber, 4.2 g / 100g soluble sugar, and 92.6 g / 100g moisture. Details are as follows: 1. Experimental Design: 4 treatments, 3 replicates. Each plot is 3 m wide and 10 m long, with a plot area of ​​30 m². 2 Eight radish plants with uniform growth were selected from each plot as field trait survey subjects. The main survey and testing indicators included: plant height, plant width, leaf length, leaf width, root length, root diameter, and plot yield. Two radishes were selected from each plot, i.e., six radishes per treatment, for quantitative analysis of quality indicators. The main analytical indicators included moisture (dry matter), soluble sugar, and crude fiber content. Moisture content was determined by direct drying, soluble sugar by high-performance liquid chromatography, and crude fiber by acid-base digestion.

[0046] 2. Results and Analysis

[0047] (1) Effects of different fertilization treatments on the biological traits of radish

[0048] Table 2 shows that Treatment 1 exhibited the highest plant height, plant width, leaf length, leaf width, root thickness, and root length, surpassing the effects of the inactivated bio-organic fertilizer in Treatment 2. This indicates that the bio-organic fertilizer promoted the absorption of fertilizer by the crop roots and increased the adsorption of nutrients by the soil. Treatment 4, the control group without fertilizer, showed the weakest growth.

[0049] Table 2 Effects of different fertilization treatments on field traits of radish

[0050] (2) Effects of different fertilization treatments on radish yield

[0051] As shown in Table 3, treatment 1 had the highest yield per mu (667 square meters), at 2920.7 kg, which was 626.2 kg higher than the control, representing a yield increase of 27.3%, and was significantly higher than the other three treatments. Treatment 3 was the second highest, with a yield of 2696.9 kg per mu. Although the yield difference between treatment 1 and treatment 2 was not significant, both treatments were significantly higher than the control.

[0052] Table 3. Effects of different fertilization treatments on radish yield

[0053] (3) Effects of different fertilization treatments on radish quality

[0054] As shown in Table 4, the crude fiber content of radish treated by treatment 1 was lower than that of conventional fertilization treatment 3 and the control, while the soluble sugar content was higher than that of treatment 2. The soluble sugar values ​​of treatment 2 and treatment 4 were the same. Compared with treatment 2, treatment 1 had a relatively lower moisture content and a relatively higher dry matter content. This indicates that the application of bio-organic fertilizer can improve the quality of Huangzhou radish and increase the soluble sugar content of the fleshy root.

[0055] Table 4. Effects of different fertilization treatments on radish quality

[0056] As can be seen from the above embodiments, the present invention provides a method for propagating radish seedlings from mature plants, including the following steps: (1) sowing radishes, conducting initial screening before the radish fleshy roots mature, conducting secondary screening after the radish fleshy roots mature, and then removing some leaves of the radish to obtain seedlings; (2) applying organic fertilizer and compound fertilizer to the soil, deep plowing and ridging, digging planting holes on the ridges, and transplanting the seedlings; (3) spraying chlormequat chloride during the budding stage of the seedlings, and then topping the seedlings; (4) carrying out daily field management; (5) harvesting radish seeds. The present invention has a significant effect on improving the yield of radish seedlings propagated from mature plants and is of great significance. The present invention uses a series of scientific and reasonable propagation methods to treat radish seedlings, strengthens field management during the flowering period of the seedlings, and combines measures such as stake planting, rope enclosure, and bee pollination to improve the yield of radish seedlings propagated from mature plants while ensuring the quality of radish seeds.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for propagating radish plants into seedlings, characterized in that, Includes the following steps: (1) Sow radishes, conduct the first screening before the radish fleshy root matures, conduct the second screening after the radish fleshy root matures, and then cut off some of the radish leaves to obtain seed plants; (2) Apply organic fertilizer and compound fertilizer to the soil, plow deeply and then make ridges, dig planting holes on the ridges and transplant the seedlings; (3) Spray chlormequat chloride during the budding stage of the seed plants, and then top the seed plants. (4) Conduct routine field management; (5) Harvest radish seeds.

2. The method according to claim 1, characterized in that, The criteria for the initial screening in step (1) are: removing diseased and weak seedlings during the critical periods such as the seedling stage and the early stage of fleshy root growth, and removing radish plants that do not conform to the characteristics of the original variety based on leaf shape, leaf color and other traits; the criteria for the secondary screening are: selecting seed plants that are free from pests and diseases, undamaged and large in size; when cutting, retain 5-10cm of radish greens and cut off the rest.

3. The method according to claim 2, characterized in that, In step (2), the organic fertilizer has an organic matter content of ≥50% and an application rate of 100~200 kg / mu; the compound fertilizer has an application rate of 15~20 kg / mu; the deep plowing depth is 15~20 cm; the ridge height is 20~25 cm, the ridge width is 30~40 cm, the furrow width is 35~45 cm, the ridge spacing is 70~75 cm, the spacing between the planting holes is 35~40 cm, and the transplanting of seedlings is based on the standard that the soil does not cover the radish heart leaves and the fleshy roots do not expose the shoulders. Water once after transplanting.

4. The method according to claim 3, characterized in that, The land mentioned in step (2) is the land in the greenhouse, which is 6-10m wide and 35-45m long; after transplanting the seedlings, a rainproof shed is added to the top of the greenhouse, and an insect-proof net is installed below the greenhouse.

5. The method according to claim 4, characterized in that, The spraying time mentioned in step (3) is from 8 to 10 am on a sunny day. When spraying, spray the radish flower buds and surrounding leaves evenly until the leaves are moist but not dripping. The chlormequat chloride is a 45-55% aqueous solution with a concentration of 550-650 mg / L. The topping treatment is carried out one week after spraying the chlormequat chloride and before spraying the foliar fertilizer. The topping method is to remove all flowering and non-flowering flower buds at the top of the main stem of the plant.

6. The method according to claim 5, characterized in that, The daily field management described in step (4) includes fertilizer and water management, weeding and hoeing, stake planting and rope planting, bee pollination, and pest and disease control. The fertilizer and water management method is as follows: After the seedlings bolt, apply potassium sulfate compound fertilizer at a rate of 8-12 kg / mu. At the early flowering stage, apply potassium dihydrogen phosphate foliar spray at a rate of 60-90 g / mu diluted in 15 kg of water. The application of potassium dihydrogen phosphate was carried out after the topping treatment; Stop applying fertilizer and control water during the pod-setting stage of the seedlings. If the soil is dry at this time, water once.

7. The method according to claim 6, characterized in that, The method of weeding and cultivating is as follows: cultivate 1-2 times before the seed plants bolt and flower; The method of inserting poles and tying ropes is as follows: In the early flowering stage of the seedlings, insert a bamboo pole 1-1.4m high along the ridge, from the beginning to the end of the ridge, at intervals of 4-6m. When the radish plants reach a height of 40-50cm, tie the first rope around the radish plants on both sides of the ridge, and tie a knot at each bamboo pole. As the radishes grow and the plant height increases, tie a second rope about 35-45cm above the first rope, and tie a knot at each bamboo pole to fix the radish stem.

8. The method according to claim 6, characterized in that, The method of bee pollination is as follows: at the early stage of flowering of the seed plants, place one beehive 4-6m away from the entrance of the greenhouse, with the beehive 50-80cm above the ground, and place 10,000-15,000 bees in each beehive, with the entrance and exit of the beehive facing south.

9. The method according to claim 6, characterized in that, The methods for controlling the diseases and pests are as follows: Downy mildew is controlled by spraying with 80% mancozeb wettable powder at a dilution of 500-700 times; sclerotinia rot is controlled by spraying with 75% chlorothalonil wettable powder at a dilution of 500-800 times; aphids are controlled by spraying with 10% imidacloprid wettable powder at a dilution of 2400-2600 times; cabbage caterpillars are controlled by spraying with 4.5% high-efficiency cypermethrin emulsifiable concentrate at a standard rate of 30-50 ml / acre.

10. The method according to claim 1, characterized in that, The time for harvesting radish seeds as described in step (5) is in early June.

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