Cultivation method of waterlogging-resistant and mechanized sorghum variety

Abstract

The invention relates to the technical field of sorghum cultivation, and discloses a cultivation method of a waterlogging-resistant sorghum variety suitable for mechanization, which comprises the following steps: step 1, seed selection: selecting waterlogging-resistant sorghum seeds with uniform particle size as female parents, and selecting local extra-dwarf varieties as male parents; the selected male parent seeds and the selected female parent seeds are cleaned, floating male parent seeds and floating female parent seeds are removed in the cleaning process, and only the complete seeds are reserved for use; wherein the eroded seeds with damaged surfaces need to be removed together. According to the cultivation method of the waterlogging-resistant sorghum variety suitable for mechanization, the local waterlogging-resistant fourth-generation seeds obtained through the steps are excellent in waterlogging resistance, high in adaptive capacity, high in yield and stable, the root system is robust and developed in the planting process, plants grow robustly, the lodging-resistant capacity is enhanced, and meanwhile the overall height of the plants is uniform and suitable for mechanization harvesting.

Description

Technical Field

[0001] The invention relates to the technical field of sorghum cultivation, and in particular to a method for cultivating a waterlogging-resistant sorghum variety suitable for mechanization. Background Art

[0002] Sorghum is an annual tall herbaceous plant of the genus Sorghum in the Poaceae family. The stalks vary greatly in height, are thick and upright, and have supporting roots on the base nodes; the leaves are broad and long, and the leaf sheaths are glabrous or slightly powdery; the ligule is sclerophyllous, with a round tip and ciliated edges; the leaf blades are linear to linear-lanceolate, with a round or slightly ear-shaped base, and the surface is dark green; the panicle is loose; the caryopsis is flat and convex on both sides, yellow-green at first, and dark brown when mature; the styles are separated, and the stigma is broom-shaped, and the flowering and fruiting period is from June to September. In the process of sorghum cultivation, there is a general problem that the waterlogging resistance is low, and sorghum is prone to lodging, which reduces the yield of sorghum. In view of this, a breeding method for waterlogging-resistant sorghum varieties suitable for mechanization is proposed. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a method for cultivating a waterlogging-resistant sorghum variety suitable for mechanization, which solves the problem that sorghum has poor waterlogging resistance and is prone to lodging due to its high height, thereby reducing the yield of sorghum.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for breeding a waterlogging-resistant sorghum variety suitable for mechanization comprises the following steps:

[0008] Step 1: Seed selection: Select waterlogging-resistant sorghum seeds with uniform grain size as the female parent, and select local special dwarf varieties as the male parent;

[0009] Step 2: Cleaning: Clean the selected male and female seeds, remove the floating male and female seeds during the cleaning process, and only keep the seeds with complete particles for use;

[0010] Among them, the seeds with erosion and surface damage need to be removed;

[0011] Step 3, hybridization: hybridizing the seeds obtained in step 2 to obtain local flood-resistant primary seeds;

[0012] Step 4, planting: planting the local flood-resistant first-generation seeds obtained in step 3 in the field, and the sowing time is between late May and late June of the lunar calendar;

[0013] Step 4 (A: Planting density: nest spacing 10-15cm, row spacing 50-67cm;

[0014] Step 4 (B: Fertilize after sowing. Generally, 2000-2500 kg of human and animal manure, 30-40 kg of superphosphate, 10 kg of urea or 30-40 kg of compound fertilizer are required per mu;

[0015] Step 4 (C: After sowing and germination, timely seedling supplement, seedling inspection, intertillage weeding and pest control shall be carried out according to the germination situation. Common hybrid seedlings mixed mechanically and biologically in the field and deformed seedlings caused by natural variation shall be pulled out several times in stages during the seedling stage, jointing stage and heading stage;

[0016] Step 5: After the local flood-resistant first-generation seeds mature, select whole ears with an ear length of 35-40 cm as local flood-resistant second-generation seeds;

[0017] Step 6: self-pollinate the local flood-tolerant second-generation seed, and then plant it through the above steps to obtain the local flood-tolerant third-generation seed;

[0018] Step 7: self-pollinate the third generation local flood-tolerant varieties, and then plant them through the above steps to obtain the fourth generation local flood-tolerant varieties.

[0019] Preferably, during the planting process, the cultivation area is divided into a plurality of target areas, and the target areas are absolutely isolated, and the condition of the sorghum is monitored and recorded.

[0020] Preferably, after the sorghum cultivation is completed, the soil in the target area is thoroughly disinfected to prevent the spread of pests and diseases in the target area.

[0021] Preferably, the sowing in step 4 ensures 6,000 to 10,000 plants per acre.

[0022] Preferably, the monitoring records include the survival rate in the target area, the height of sorghum in the target area, the plant density, the leaf length, the ear length, and the leaf thickness.

[0023] Preferably, the local first-generation flood-tolerant seeds are mixed with a seed dressing agent before planting.

[0024] Preferably, the fertilization in step 4 (B) can be performed every 15-20 days.

[0025] Preferably, in step 4, watering is performed on the 3rd to 5th day after planting, and the amount of watering is such that the surface soil is moistened to a depth of 1-2 cm.

[0026] Preferably, the seed diameters of the female parent and the male parent are 3.7-5.8 mm in length, 2.5-4.0 mm in width, and 1.8-2.8 mm in thickness, respectively.

[0027] Preferably, the female parent varieties include Liaonuo No. 10, Liaonuo No. 22, Liaoliang No. 1, Liaoza 62, Liangnuo No. 1, Xinfeng 218, Jiliang No. 2, Liaotian No. 3, and Jinza 100.

[0028] (III) Beneficial effects

[0029] Compared with the prior art, the present invention provides a method for breeding a waterlogging-resistant sorghum variety suitable for mechanization, which has the following beneficial effects:

[0030] 1. The method for breeding the waterlogging-resistant sorghum variety suitable for mechanization, wherein the local waterlogging-resistant fourth-generation variety obtained through the above steps has excellent waterlogging resistance, strong adaptability, stable high yield, and a robust and developed root system during the planting process, strong plant growth, and enhanced lodging resistance. At the same time, the overall height of the plant is uniform and suitable for mechanized harvesting.

[0031] 2. The breeding method of this waterlogging-resistant sorghum variety suitable for mechanization can directly eliminate plants with poor disease and insect resistance by releasing pests and diseases in the target area, and only retain plants with good disease and insect resistance, thereby making the offspring after self-pollination more resistant to diseases and insects. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] A method for breeding a waterlogging-resistant sorghum variety suitable for mechanization comprises the following steps:

[0035] Step 1: Seed selection: Select waterlogging-resistant sorghum seeds with uniform grain size as the female parent, and select local special dwarf varieties as the male parent;

[0036] The seed sizes of the female parent and the male parent are 3.7 mm long, 2.5 mm wide, and 1.8 mm thick respectively;

[0037] The female varieties include Liangnuo No. 1, Xinfeng No. 218, Jiliang No. 2, Liaotian No. 3, Jinza No. 100, etc.

[0038] Step 2: Cleaning: Clean the selected male and female seeds, remove the floating male and female seeds during the cleaning process, and only keep the seeds with complete particles for use;

[0039] Among them, the seeds with erosion and surface damage need to be removed;

[0040] Step 3, hybridization: hybridizing the seeds obtained in step 2 to obtain local flood-resistant primary seeds;

[0041] Step 4, planting: Plant the local flood-resistant first-generation seeds obtained in step 3 in the field. The sowing time is between late May and late June of the lunar calendar. The time should not be too late to avoid low temperatures in the middle and late growth stages, which will affect growth and delay maturity. Water the seeds on the third day after planting to ensure the emergence rate.

[0042] Before planting, the local first-generation flood-resistant seeds need to be mixed with seed dressing agents to prevent the local first-generation flood-resistant seeds from being eaten by insects in the soil after planting, thus ensuring the germination rate;

[0043] Step 4 (A: Planting density: 10 cm between nests, 50 cm between rows, and 6,000 plants per mu;

[0044] Step 4 (B: Fertilize after sowing. Generally, 2,000 kg of human and animal manure, 30 kg of superphosphate, 10 kg of urea or 30 kg of compound fertilizer are required per mu. Fertilize every 15 days.

[0045] Step 4 (C: After sowing and germination, timely seedling supplement, seedling inspection, intertillage weeding and pest control shall be carried out according to the germination situation. Common hybrid seedlings mixed mechanically and biologically in the field and deformed seedlings caused by natural variation shall be pulled out several times in stages during the seedling stage, jointing stage and heading stage;

[0046] During the planting process, the cultivation area is divided into multiple target areas, and the target areas are absolutely isolated, and the sorghum conditions are monitored and recorded;

[0047] After sorghum cultivation is completed, the soil in the target area is thoroughly disinfected to prevent the spread of pests and diseases in the target area;

[0048] Step 5: After the local flood-resistant first-generation seeds mature, select whole ears with an ear length of 35-40 cm as local flood-resistant second-generation seeds;

[0049] Step 6: self-pollinate the local flood-tolerant second-generation seed, and then plant it through the above steps to obtain the local flood-tolerant third-generation seed;

[0050] Step 7: self-pollinate the third generation local flood-tolerant varieties, and then plant them through the above steps to obtain the fourth generation local flood-tolerant varieties.

[0051] The local flood-resistant fourth-generation varieties obtained through the above steps have excellent flood resistance, strong adaptability, stable high yield, and during the planting process, the root system is robust and developed, the plant grows strong, and the lodging resistance is enhanced. At the same time, the overall height of the plant is uniform and suitable for mechanized harvesting.

[0052] Embodiment 2:

[0053] A method for breeding a waterlogging-resistant sorghum variety suitable for mechanization comprises the following steps:

[0054] Step 1: Seed selection: Select waterlogging-resistant sorghum seeds with uniform grain size as the female parent, and select local special dwarf varieties as the male parent;

[0055] Among them, the seed diameters of the female parent and the male parent are 5.8 mm long, 4.0 mm wide, and 2.8 mm respectively;

[0056] The female varieties include Liaonuo No. 10, Liaonuo No. 22, Liaoliang No. 1, Liaoza 62, Liangnuo No. 1, Xinfeng 218, Jiliang No. 2, Liaotian No. 3, Jinza 100, etc.

[0057] Step 2: Cleaning: Clean the selected male and female seeds, remove the floating male and female seeds during the cleaning process, and only keep the seeds with complete particles for use;

[0058] Among them, the seeds with erosion and surface damage need to be removed;

[0059] Step 3, hybridization: hybridizing the seeds obtained in step 2 to obtain local flood-resistant primary seeds;

[0060] Step 4, planting: Plant the local flood-resistant first-generation seeds obtained in step 3 in the field. The sowing time is between late May and late June of the lunar calendar. The time should not be too late to avoid low temperatures in the middle and late growth stages, which will affect growth and delay maturity. Water the seeds on the third day after planting to ensure the emergence rate.

[0061] Before planting, the local first-generation flood-resistant seeds need to be mixed with seed dressing agents to prevent the local first-generation flood-resistant seeds from being eaten by insects in the soil after planting, thus ensuring the germination rate;

[0062] Step 4 (A: Planting density: 12 cm between nests, 55 cm between rows, 7,000 plants per mu;

[0063] Step 4 (B: Fertilize after sowing. Generally, 2,500 kg of human and animal manure, 40 kg of superphosphate, 10 kg of urea or 40 kg of compound fertilizer are required per mu. Fertilize every 20 days.

[0064] Step 4 (C: After sowing and germination, timely seedling supplement, seedling inspection, intertillage weeding and pest control shall be carried out according to the germination situation. Common hybrid seedlings mixed mechanically and biologically in the field and deformed seedlings caused by natural variation shall be pulled out several times in stages during the seedling stage, jointing stage and heading stage;

[0065] During the planting process, the cultivation area is divided into multiple target areas, and the target areas are absolutely isolated, and the sorghum conditions are monitored and recorded;

[0066] After sorghum cultivation is completed, the soil in the target area is thoroughly disinfected to prevent the spread of pests and diseases in the target area;

[0067] Step 5: After the local flood-resistant first-generation seeds mature, select whole ears with an ear length of 35-40 cm as local flood-resistant second-generation seeds;

[0068] Step 6: self-pollinate the local flood-tolerant second-generation seed, and then plant it through the above steps to obtain the local flood-tolerant third-generation seed;

[0069] Step 7: self-pollinate the third generation local flood-tolerant varieties, and then plant them through the above steps to obtain the fourth generation local flood-tolerant varieties.

[0070] The local flood-resistant fourth-generation varieties obtained through the above steps have excellent flood resistance, strong adaptability, stable high yield, and during the planting process, the root system is robust and developed, the plant grows strong, and the lodging resistance is enhanced. At the same time, the overall height of the plant is uniform and suitable for mechanized harvesting.

[0071] Embodiment three:

[0072] A method for breeding a waterlogging-resistant sorghum variety suitable for mechanization comprises the following steps:

[0073] Step 1: Seed selection: Select waterlogging-resistant sorghum seeds with uniform grain size as the female parent, and select local special dwarf varieties as the male parent;

[0074] The seed sizes of the female parent and the male parent are 4.5 mm long, 3.5 mm wide, and 2.3 mm thick respectively;

[0075] The female varieties include Liaonuo No. 10, Liaonuo No. 22, Liaoliang No. 1, Liaoza 62, Liangnuo No. 1, Xinfeng 218, Jiliang No. 2, Liaotian No. 3, Jinza 100, etc.

[0076] Step 2: Cleaning: Clean the selected male and female seeds, remove the floating male and female seeds during the cleaning process, and only keep the seeds with complete particles for use;

[0077] Among them, the seeds with erosion and surface damage need to be removed;

[0078] Step 3, hybridization: hybridizing the seeds obtained in step 2 to obtain local flood-resistant primary seeds;

[0079] Step 4, planting: Plant the local flood-resistant first-generation seeds obtained in step 3 in the field. The sowing time is between late May and late June of the lunar calendar. The time should not be too late to avoid low temperatures in the middle and late growth stages, which will affect growth and delay maturity. Water the seeds on the 5th day after planting to ensure the emergence rate.

[0080] Before planting, the local first-generation flood-resistant seeds need to be mixed with seed dressing agents to prevent the local first-generation flood-resistant seeds from being eaten by insects in the soil after planting, thus ensuring the germination rate;

[0081] Step 4 (A: Planting density: 13 cm between nests, 60 cm between rows, 8,000 plants per mu;

[0082] Step 4 (B: Fertilize after sowing. Generally, 2250 kg of human and animal manure, 35 kg of superphosphate, 10 kg of urea or 35 kg of compound fertilizer are required per mu. Fertilize every 15 days.

[0083] Step 4 (C: After sowing and germination, timely seedling supplement, seedling inspection, intertillage weeding and pest control shall be carried out according to the germination situation. Common hybrid seedlings mixed mechanically and biologically in the field and deformed seedlings caused by natural variation shall be pulled out several times in stages during the seedling stage, jointing stage and heading stage;

[0084] During the planting process, the cultivation area is divided into multiple target areas, and the target areas are absolutely isolated, and the sorghum conditions are monitored and recorded;

[0085] After sorghum cultivation is completed, the soil in the target area is thoroughly disinfected to prevent the spread of pests and diseases in the target area;

[0086] Step 5: After the local flood-resistant first-generation seeds mature, select whole ears with an ear length of 35-40 cm as local flood-resistant second-generation seeds;

[0087] Step 6: self-pollinate the local flood-tolerant second-generation seed, and then plant it through the above steps to obtain the local flood-tolerant third-generation seed;

[0088] Step 7: self-pollinate the third generation local flood-tolerant varieties, and then plant them through the above steps to obtain the fourth generation local flood-tolerant varieties.

[0089] The local flood-resistant fourth-generation varieties obtained through the above steps have excellent flood resistance, strong adaptability, stable high yield, and during the planting process, the root system is robust and developed, the plant grows strong, and the lodging resistance is enhanced. At the same time, the overall height of the plant is uniform and suitable for mechanized harvesting.

[0090] Embodiment 4:

[0091] A method for breeding a waterlogging-resistant sorghum variety suitable for mechanization comprises the following steps:

[0092] Step 1: Seed selection: Select waterlogging-resistant sorghum seeds with uniform grain size as the female parent, and select local special dwarf varieties as the male parent;

[0093] The seed sizes of the female parent and the male parent are 3.7 mm long, 4.0 mm wide, and 2.8 mm thick respectively;

[0094] The female varieties include Liaonuo No. 10, Liaonuo No. 22, Liaoliang No. 1, Liaoza 62, Liangnuo No. 1, Xinfeng 218, Jiliang No. 2, Liaotian No. 3, Jinza 100, etc.

[0095] Step 2: Cleaning: Clean the selected male and female seeds, remove the floating male and female seeds during the cleaning process, and only keep the seeds with complete particles for use;

[0096] Among them, the seeds with erosion and surface damage need to be removed;

[0097] Step 3, hybridization: hybridizing the seeds obtained in step 2 to obtain local flood-resistant primary seeds;

[0098] Step 4, planting: Plant the local flood-resistant first-generation seeds obtained in step 3 in the field. The sowing time is between late May and late June of the lunar calendar. The time should not be too late to avoid low temperatures in the middle and late growth stages, which will affect growth and delay maturity. Water the seeds on the third day after planting to ensure the emergence rate.

[0099] Before planting, the local first-generation flood-resistant seeds need to be mixed with seed dressing agents to prevent the local first-generation flood-resistant seeds from being eaten by insects in the soil after planting, thus ensuring the germination rate;

[0100] Step 4 (A: Planting density: 14 cm between nests, 63 cm between rows, 9,000 plants per mu;

[0101] Step 4 (B: Fertilize after sowing. Generally, 2,300 kg of human and animal manure, 40 kg of superphosphate, 10 kg of urea or 30 kg of compound fertilizer are required per mu. Fertilize every 18 days.

[0102] Step 4 (C: After sowing and germination, timely seedling supplement, seedling inspection, intertillage weeding and pest control shall be carried out according to the germination situation. Common hybrid seedlings mixed mechanically and biologically in the field and deformed seedlings caused by natural variation shall be pulled out several times in stages during the seedling stage, jointing stage and heading stage;

[0103] During the planting process, the cultivation area is divided into multiple target areas, and the target areas are absolutely isolated, and the sorghum conditions are monitored and recorded;

[0104] After sorghum cultivation is completed, the soil in the target area is thoroughly disinfected to prevent the spread of pests and diseases in the target area;

[0105] Step 5: After the local flood-resistant first-generation seeds mature, select whole ears with an ear length of 35-40 cm as local flood-resistant second-generation seeds;

[0106] Step 6: self-pollinate the local flood-tolerant second-generation seed, and then plant it through the above steps to obtain the local flood-tolerant third-generation seed;

[0107] Step 7: self-pollinate the third generation local flood-tolerant varieties, and then plant them through the above steps to obtain the fourth generation local flood-tolerant varieties.

[0108] The local flood-resistant fourth-generation varieties obtained through the above steps have excellent flood resistance, strong adaptability, stable high yield, and during the planting process, the root system is robust and developed, the plant grows strong, and the lodging resistance is enhanced. At the same time, the overall height of the plant is uniform and suitable for mechanized harvesting.

[0109] Embodiment five:

[0110] A method for breeding a waterlogging-resistant sorghum variety suitable for mechanization comprises the following steps:

[0111] Step 1: Seed selection: Select waterlogging-resistant sorghum seeds with uniform grain size as the female parent, and select local special dwarf varieties as the male parent;

[0112] The seed sizes of the female parent and the male parent are 5.0 mm long, 4.0 mm wide, and 1.8 mm thick respectively;

[0113] The female varieties include Liaonuo No. 10, Liaonuo No. 22, Liaoliang No. 1, Liaoza 62, Liangnuo No. 1, Xinfeng 218, Jiliang No. 2, Liaotian No. 3, Jinza 100, etc.

[0114] Step 2: Cleaning: Clean the selected male and female seeds, remove the floating male and female seeds during the cleaning process, and only keep the seeds with complete particles for use;

[0115] Among them, the seeds with erosion and surface damage need to be removed;

[0116] Step 3, hybridization: hybridizing the seeds obtained in step 2 to obtain local flood-resistant primary seeds;

[0117] Step 4, planting: Plant the local flood-resistant first-generation seeds obtained in step 3 in the field. The sowing time is between late May and late June of the lunar calendar. The time should not be too late to avoid low temperatures in the middle and late growth stages, which will affect growth and delay maturity. Water the seeds on the third day after planting to ensure the emergence rate.

[0118] Before planting, the local first-generation flood-resistant seeds need to be mixed with seed dressing agents to prevent the local first-generation flood-resistant seeds from being eaten by insects in the soil after planting, thus ensuring the germination rate;

[0119] Step 4 (A: Planting density: 15 cm between nests, 67 cm between rows, 10,000 plants per mu;

[0120] Step 4 (B: Fertilize after sowing. Generally, 2,300 kg of human and animal manure, 40 kg of superphosphate, 10 kg of urea or 30 kg of compound fertilizer are required per mu. Fertilize every 20 days.

[0121] Step 4 (C: After sowing and germination, timely seedling supplement, seedling inspection, intertillage weeding and pest control shall be carried out according to the germination situation. Common hybrid seedlings mixed mechanically and biologically in the field and deformed seedlings caused by natural variation shall be pulled out several times in stages during the seedling stage, jointing stage and heading stage;

[0122] During the planting process, the cultivation area is divided into multiple target areas, and the target areas are absolutely isolated, and the sorghum conditions are monitored and recorded;

[0123] After sorghum cultivation is completed, the soil in the target area is thoroughly disinfected to prevent the spread of pests and diseases in the target area;

[0124] Step 5: After the local flood-resistant first-generation seeds mature, select whole ears with an ear length of 35-40 cm as local flood-resistant second-generation seeds;

[0125] Step 6: self-pollinate the local flood-tolerant second-generation seed, and then plant it through the above steps to obtain the local flood-tolerant third-generation seed;

[0126] Step 7: self-pollinate the third generation local flood-tolerant varieties, and then plant them through the above steps to obtain the fourth generation local flood-tolerant varieties.

[0127] The local flood-resistant fourth-generation varieties obtained through the above steps have excellent flood resistance, strong adaptability, stable high yield, and during the planting process, the root system is robust and developed, the plant grows strong, and the lodging resistance is enhanced. At the same time, the overall height of the plant is uniform and suitable for mechanized harvesting.

[0128] Data comparison and analysis:

[0129] In the variety experiment, the yield of the seedling raising method of the present invention ranks first, and is significantly higher than that of the comparison variety. At the same time, it has excellent waterlogging resistance and strong resistance to diseases and insect pests. Among them, A+ and A both represent waterlogging resistance, and A+ is the highest.

[0130] The following table shows the specific experimental data:

[0131]

[0132] It can be seen from the above table that the planting method of the present invention significantly improves the yield and waterlogging resistance of sorghum. At the same time, the yield of the present invention is relatively high, and during the planting process, the root system is robust and developed, the plants grow robustly, and the lodging resistance is enhanced. At the same time, the overall height of the plants is uniform and suitable for mechanized harvesting.

[0133] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for breeding a waterlogging-resistant sorghum variety suitable for mechanization, characterized in that: The following steps are involved: Step 1: Seed selection: Select waterlogging-resistant sorghum seeds with uniform grain size as the female parent, and select local special dwarf varieties as the male parent; Step 2: Cleaning: Clean the selected male and female seeds, remove the floating male and female seeds during the cleaning process, and only keep the seeds with complete particles for use; Among them, the seeds with erosion and surface damage need to be removed together; Step 3, hybridization: hybridizing the seeds obtained in step 2 to obtain local flood-resistant primary seeds; Step 4, planting: planting the local flood-resistant first-generation seeds obtained in step 3 in the field, and the sowing time is between late May and late June of the lunar calendar; Step 4 (A: Planting density: nest spacing 10-15cm, row spacing 50-67cm; Step 4 (B: Fertilize after sowing. Apply 2000-2500 kg of human and animal manure, 30-40 kg of superphosphate, 10 kg of urea or 30-40 kg of compound fertilizer per mu; Step 4 (C: After sowing and germination, timely seedling supplement, seedling inspection, intertillage weeding and pest control shall be carried out according to the germination situation. Common hybrid seedlings mixed mechanically and biologically in the field and deformed seedlings caused by natural variation shall be pulled out several times in stages during the seedling stage, jointing stage and heading stage; Step 5: After the local flood-resistant first-generation seeds mature, select whole ears with an ear length of 35-40 cm as local flood-resistant second-generation seeds; Step 6: self-pollinate the local flood-tolerant second-generation seed, and then plant it through the above steps to obtain the local flood-tolerant third-generation seed; Step 7: self-pollinate the third generation local flood-tolerant varieties, and then plant them through the above steps to obtain the fourth generation local flood-tolerant varieties.

2. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 1, characterized in that: During the planting process, the cultivation area is divided into multiple target areas, and the target areas are absolutely isolated, and the sorghum conditions are monitored and recorded.

3. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 2, characterized in that: After the sorghum cultivation is completed, the soil in the target area is thoroughly disinfected to prevent the spread of pests and diseases in the target area.

4. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 1, characterized in that: In step 4, ensure that 6,000 to 10,000 plants are sown per acre.

5. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 2, characterized in that: The monitoring records include the survival rate of the target area, the height of sorghum in the target area, the plant density, the leaf length, the ear length, and the leaf thickness.

6. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 1, characterized in that: Before planting, the local first-generation flood-resistant seeds are mixed with a seed dressing agent.

7. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 1, characterized in that: The fertilization described in step 4 (B) can be carried out every 15-20 days.

8. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 1, characterized in that: As described in step 4, watering should be carried out on the 3rd to 5th day after planting, and the amount of watering should be such that the surface soil is moistened to a depth of 1-2 cm.

9. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 1, characterized in that: The seed diameters of the female parent and the male parent are respectively 3.7-5.8 mm in length, 2.5-4.0 mm in width, and 1.8-2.8 mm in thickness.

10. The method for breeding a waterlogging-resistant sorghum variety suitable for mechanization according to claim 1, characterized in that: The female varieties include Liaonuo No. 10, Liaonuo No. 22, Liaoliang No. 1, Liaoza 62, Liangnuo No. 1, Jiliang No. 2, Liaotian No. 3, and Jinza 100.

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