Combined seeder for simultaneously applying base fertilizer and mouth fertilizer for rape and wheat

Abstract

The invention provides a base fertilizer and mouth fertilizer simultaneous application combined seeder for rape and wheat. The base fertilizer and mouth fertilizer simultaneous application combined seeder comprises a discharging height adjusting system, a ditching and soil preparation system, a rack fan system and a seed fertilizer simultaneous application system, the discharging height adjusting system is connected with the rack fan system through a discharging height adjusting system connecting rod and a discharging height adjusting system mounting groove; the ditching and soil preparation system is connected with the rack fan system through a rack side plate; and the seed and fertilizer simultaneous application system is connected with the rack fan system through a seed and fertilizer box mounting plate. By adjusting the height of the cross beam of the discharging height adjusting system, seeds and a mouth fertilizer fall down from a proper height, and the situation that a seed outlet and a mouth fertilizer outlet make contact with soil, and discharging blockage is caused is avoided. The staggered installation of the seed outlet and the mouth fertilizer outlet can ensure that the seeds and the mouth fertilizer keep a certain vertical distance when falling into the soil, so that the direct contact between the seeds and the chemical fertilizer is effectively avoided, the direct ablation effect of the chemical fertilizer on the seeds is reduced, the seeds are protected from being damaged, and the emergence rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of seed drills, and in particular to a combined seed drill for applying base fertilizer and feed fertilizer for both oil and wheat. Background Art

[0002] Wheat and rapeseed are important winter crops in the Yangtze River Basin. The dual-purpose sowing of rapeseed and wheat can effectively improve the utilization rate of machinery. In order to improve the production efficiency and utilization rate of rapeseed and wheat, combined seeders are widely used in the sowing of rapeseed and wheat, and can simultaneously realize the processes of rotary tillage-ditching-sowing-fertilization. However, in the actual production process of the current combined seeder, under the working conditions of high soil moisture content and heavy soil, the fertilizer will be rotated deep into the soil by the rotary tiller, making it impossible for the fertilizer to be fully absorbed by the seeds, affecting germination and emergence, thus resulting in weak seedlings. Therefore, it is urgent to develop a dual-purpose seeder for rapeseed and wheat to effectively improve the utilization rate of machinery, realize multi-layer fertilization, and ensure strong seedlings under high humidity and heavy soil conditions. Therefore, solving the problem of synchronous application of base fertilizer and oral fertilizer is the key to improving the quality of emergence. Summary of the invention

[0003] In view of this, the present invention proposes a combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat, so as to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides a combined seeder for applying base fertilizer and feed fertilizer simultaneously for both oil and wheat, comprising a discharge height adjustment system, a ditching and soil preparation system, a frame fan system and a seed and fertilizer simultaneous application system;

[0005] The discharge height adjustment system is connected to the frame fan system via a discharge height adjustment system connecting rod and a discharge height adjustment system mounting slot;

[0006] The trenching and soil preparation system is connected to the frame fan system through a frame side plate;

[0007] The seed and fertilizer co-application system is connected to the frame fan system through a seed and fertilizer box mounting plate.

[0008] Furthermore, the discharge height adjustment system includes a discharge height adjustment system connecting rod, a discharge height adjustment rod, and a discharge height adjustment system crossbeam. The discharge height adjustment system connecting rod and the discharge height adjustment rod are both arranged at both ends of the discharge height adjustment system crossbeam. The discharge height adjustment rod is arranged on the inner side of the discharge height adjustment system connecting rod. A plurality of fertilizer outlets are arranged on the discharge height adjustment system crossbeam, and a seed outlet is arranged on one side of each fertilizer outlet.

[0009] Furthermore, the furrowing and soil leveling system includes a furrow opener and a soil leveling scraper. The furrow opener is arranged at both ends of the soil leveling scraper. A disc harrow is provided behind the furrow opener, and a plurality of rotary tillage blades are provided on the inner side of the soil leveling scraper.

[0010] Furthermore, the frame fan system includes a frame side panel and a seed and fertilizer box mounting plate connected to each other, the frame side panel is provided with a discharge height adjustment system mounting groove, the connection between the frame side panel and the seed and fertilizer box mounting plate is provided with a frame main beam, the frame main beam is provided with a gearbox, a fan transmission, and a fan connected in sequence, and the fan is driven by the gearbox and the fan transmission.

[0011] Furthermore, the frame fan system also includes a rotary tillage transmission, which is used to drive a rotary tillage blade. The rotary tillage transmission is driven by a gearbox that drives the frame main beam, and the gearbox is driven by a tractor PTO.

[0012] Furthermore, the seed-fertilizer simultaneous application system includes a horizontally arranged seeding system and a fertilizer discharge system, the seeding system includes a seed box, a base fertilizer box 2 is provided at the rear of the seed box, a seeding motor is connected to the outer side of the seed box, a seeding device is connected below the seed box, a seed dispenser is connected below the seeding device, and a plurality of seeding tubes are provided on the seed dispenser.

[0013] Furthermore, the outlet fertilizer discharge system includes an outlet fertilizer box, a base fertilizer box is provided at the rear of the outlet fertilizer box, a fertilizer discharge motor is connected to the outside of the outlet fertilizer box, an outlet fertilizer discharge device is connected below the outlet fertilizer box, an outlet fertilizer distributor is connected below the outlet fertilizer discharge device, and a plurality of outlet fertilizer discharge pipes are provided on the seed distributor; a base fertilizer discharge device is provided at the bottom of the base fertilizer box.

[0014] Furthermore, the base fertilizer discharge device includes a base fertilizer discharge pipe, a fertilizer discharge transmission, and a base fertilizer amount adjustment device. The base fertilizer discharge pipe is connected to the bottom of the base fertilizer box one and the base fertilizer box two; the fertilizer discharge transmission and the base fertilizer amount adjustment device are arranged on the seed fertilizer box mounting plate outside the discharge fertilizer system.

[0015] Furthermore, the number of the seeding tubes is 10, the number of the outlet fertilizer tubes is 10, the number of the bottom fertilizer tubes is 8, and the number of the bottom fertilizer devices is 10. The outlet fertilizer tubes are staggered 3 to 5 cm laterally from the seeding tubes.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention innovatively proposes to simultaneously apply basal fertilizer and oral fertilizer to rapeseed and wheat, so as to meet the nutrient requirements of seed germination and growth at different stages, achieve rapid emergence and growth of seedlings in the seedling stage, and allow the roots to penetrate deeply and absorb nutrients in the deep layer in the late growth stage;

[0018] (2) The base fertilizer of the present invention is applied by a bottom fertilizer discharge device, and the outlet fertilizer discharge system applies outlet fertilizer. The amount of base fertilizer and outlet fertilizer is adjusted according to actual demand without interfering with each other.

[0019] (3) The present invention applies fertilizer to one side of the seed strip through the fertilizer discharge system, and adjusts the amount of fertilizer according to the growth characteristics of the crop, so as to achieve the effect of strengthening the seedlings without burning them, and significantly improve the crop germination rate and the strong seedling rate.

[0020] (4) The seed discharging, base fertilizer discharging and outlet fertilizer discharging systems of the combined seeder of the present invention all adopt a modular design to form a seed and fertilizer application system with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of a combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat in an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the structure of the discharge height adjustment system in an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the trenching and soil preparation system in an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the structure of a rack fan system in an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the seed and fertilizer simultaneous application system in an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the principle of the seed and fertilizer simultaneous application technology in an embodiment of the present invention;

[0028] Among them: 1. Discharge height adjustment system; 2. Ditching and soil preparation system; 3. Frame fan system; 4. Seed and fertilizer application system; 11. Discharge height adjustment system connecting rod; 12. Discharge height adjustment rod; 13. Discharge height adjustment system beam; 14. Fertilizer outlet; 15. Seed outlet; 21. Ditch opener; 22. Disc harrow; 23. Soil preparation scraper; 24. Rotary tiller; 31. Discharge height adjustment system installation slot; 32. Frame side panel; 33. Seed and fertilizer box installation plate; 34. Frame main beam ; 35. Gearbox; 36. Fan drive; 37. Fan; 38. Rotary tillage drive; 41. Seed discharge motor; 42. Seed discharge device; 43. Seed discharge pipe; 44. Fertilizer discharge pipe; 45. Fertilizer discharge device; 46. Fertilizer discharge motor; 47. Base fertilizer discharge pipe; 48. Fertilizer discharge drive; 49. Base fertilizer quantity adjustment device; 410. Base fertilizer discharge device; 411. Fertilizer discharge box; 412. Base fertilizer box one; 413. Fertilizer dispenser; 414. Base fertilizer box two; 415. Seed dispenser; 416. Seed box. DETAILED DESCRIPTION

[0029] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] This embodiment provides a combined seeder for applying base fertilizer and oral fertilizer for both oil and wheat. Figure 1 As shown, it includes a discharge height adjustment system 1, a ditching and soil preparation system 2, a frame fan system 3 and a seed and fertilizer simultaneous application system 4;

[0031] The discharge height adjustment system 1 is connected to the rack fan system 3 via a discharge height adjustment system connecting rod 11 and a discharge height adjustment system mounting slot 31;

[0032] The trenching and soil preparation system 2 is connected to the frame fan system 3 through a frame side plate 32;

[0033] The seed and fertilizer co-application system 4 is connected to the frame fan system 3 via a seed and fertilizer box mounting plate 33 .

[0034] As a preferred embodiment, Figure 2As shown, the discharge height adjustment system 1 includes a discharge height adjustment system connecting rod 11, a discharge height adjustment rod 12, and a discharge height adjustment system crossbeam 13. The discharge height adjustment system connecting rod 11 and the discharge height adjustment rod 12 are both arranged at both ends of the discharge height adjustment system crossbeam 13. The discharge height adjustment rod 12 is arranged on the inner side of the discharge height adjustment system connecting rod 11. A plurality of fertilizer outlets 14 are arranged on the discharge height adjustment system crossbeam 13, and a seed outlet 15 is arranged on one side of each fertilizer outlet 14.

[0035] It can be understood that the discharge height adjustment rod 12 can adjust the height of the discharge height adjustment system beam 13 within a certain range, so that the seeds and fertilizers fall from different heights, which can ensure that the seeds and fertilizers maintain a certain vertical distance when falling into the soil, thereby effectively avoiding direct contact between seeds and fertilizers, reducing the direct ablation effect of fertilizers on seeds, thereby protecting seeds from damage and improving the germination rate; and can make the distribution of fertilizers in the soil more even, reduce the immediate impact on the soil surface, which is beneficial to the germination and growth of seeds. At the same time, by adjusting the sowing height, the specific requirements of different crops for sowing depth can be met, thereby improving the growth effect and yield of crops.

[0036] In this embodiment, the fertilizer outlet 14 is located in front of the seed outlet 15 and is staggered, and each fertilizer outlet 14 is correspondingly provided with a seed outlet 15, which can ensure that the seeds and fertilizers can accurately correspond during sowing, so that the fertilizers can be directly applied around the seeds, avoiding the waste of fertilizers and unnecessary soil pollution. At the same time, precise fertilization can be carried out according to the needs of different crops to meet their nutrient needs during the seedling growth process.

[0037] As a preferred embodiment, Figure 3 As shown, the furrowing and soil preparation system 2 includes a furrow opener 21 and a soil preparation scraper 23. The furrow opener 21 is arranged at both ends of the soil preparation scraper 23. The seed furrow is formed by the furrow opener 21. After the sowing is completed, the furrow wall is forced to fall back and be covered with soil. The soil clods and weeds are removed by the soil preparation scraper 23.

[0038] A disc harrow 22 is provided at the rear of the furrow opener 21, and the soil is loosened by the disc harrow 22. A plurality of rotary tillers 24 are provided on the inner side of the soil preparation scraper 23, and the tillage operation is performed by the plurality of rotary tillers 24.

[0039] As a preferred embodiment, Figure 4As shown, the frame fan system 3 includes a seed and fertilizer box mounting plate 33 connected to each other by frame side panels 32, a discharge height adjustment system mounting groove 31 is provided on the frame side panel 32, a frame main crossbeam 34 is provided at the connection between the frame side panel 32 and the seed and fertilizer box mounting plate 33, and a gearbox 35, a fan transmission 36, and a fan 37 are provided on the frame main crossbeam 34, which are connected in sequence, and the fan 37 is driven by the gearbox 35 and the fan transmission 36.

[0040] It can be understood that the seed box 416 and the fertilizer box 411 are respectively installed through the seed and fertilizer box mounting plate 33, so that the overall structure of the seed drill device is more compact.

[0041] As a preferred embodiment, the frame fan system 3 also includes a rotary tillage transmission 38, which is used to drive the rotary tillage blade 24. The rotary tillage transmission 38 is driven by a gearbox 35 to drive the frame main beam 34, and the gearbox 35 is driven by the tractor PTO.

[0042] As a preferred embodiment, Figure 5 As shown, the seed-fertilizer simultaneous application system 4 includes a horizontally arranged seeding system and a fertilizer discharge system, the seeding system includes a seed box 416, a base fertilizer box 414 is provided at the rear of the seed box 416, a seeding motor 41 is connected to the outer side of the seed box 416, a seeding device 42 is connected below the seed box 416, a seed dispenser 415 is connected below the seeding device 42, and a plurality of seeding tubes 43 are provided on the seed dispenser 415.

[0043] As a preferred embodiment, the outlet fertilizer system includes an outlet fertilizer box 411, a base fertilizer box 412 is provided at the rear of the outlet fertilizer box 411, a fertilizer discharge motor 46 is connected to the outside of the outlet fertilizer box 411, an outlet fertilizer discharge device 45 is connected below the outlet fertilizer box 411, an outlet fertilizer dispenser 413 is connected below the outlet fertilizer discharge device 45, and a plurality of outlet fertilizer discharge pipes 44 are provided on the seed dispenser 413; a base fertilizer discharge device 410 is provided at the bottom of the base fertilizer box 412; the outlet fertilizer pipe 44 and the seed discharge pipe 43 are horizontally staggered by 3 to 5 cm.

[0044] As a preferred embodiment, the base fertilizer discharge device 410 includes a base fertilizer discharge pipe 47, a fertilizer discharge transmission 48, and a base fertilizer amount adjustment device 49. The base fertilizer discharge pipe 47 is connected to the bottom of the base fertilizer box 1 412 and the base fertilizer box 2 414; the fertilizer discharge transmission 48 and the base fertilizer amount adjustment device 49 are arranged on the seed fertilizer box mounting plate 33 outside the discharge fertilizer system.

[0045] As a preferred embodiment, the number of the seed discharge pipes 43 is 10, the number of the outlet fertilizer pipes 44 is 10, the number of the bottom fertilizer discharge pipes 47 is 8, and the number of the bottom fertilizer discharge devices 410 is 10.

[0046] The sowing principle of the sowing machine for applying seeds and fertilizers simultaneously provided by the present invention is as follows: Figure 6 The specific seeding process is as follows:

[0047] Furrowing and soil preparation system 2: During operation, the tractor PTO drives the rotary tiller 24 to rotate, the rotary tiller 24 tills the soil, the furrow opener 21 opens furrows on both sides, and the disc harrow 22 cuts the straw on both sides to prevent the straw from winding around the furrow opener 21. The surface of the seed bed after tillage by the rotary tiller 24 is scraped flat by the soil preparation scraper.

[0048] Seed and fertilizer simultaneous system 4: During operation, the tractor battery supplies power to the fertilizer discharge motor 46 and the seed discharge motor 41, the fertilizer discharge motor 46 drives the discharge port fertilizer device 45 to rotate, and the discharge port fertilizer device 45 then drives the discharge base fertilizer device 410 to rotate through the fertilizer discharge transmission 48, the ratio of the port fertilizer and the base fertilizer is adjusted by the base fertilizer amount adjustment device 49, and then the discharge port fertilizer device 45 discharges the fertilizer in the port fertilizer box 411, and the discharge base fertilizer device 410 discharges the fertilizer in the base fertilizer box 1 412 and the base fertilizer box 2 414 to the soil through the base fertilizer discharge pipe 47. The seed discharge motor 41 drives the seed discharge device 42 to rotate and discharge the seeds in the seed box 416.

[0049] Frame fan system 3: During operation, the tractor PTO drives the fan 37 to work, and the fan 37 rotates to generate wind force to blow the particles discharged by the seeding device 42, the outlet fertilizer device 45 and the bottom fertilizer device 410 to the seed distributor 415 and the outlet fertilizer distributor 413, and then transported to the soil through the seeding pipe 43 and the outlet fertilizer pipe 44. Since the bottom fertilizer pipe 47 is placed in front of the seed drill, under the action of the rotary tiller 24, the base fertilizer is mixed with the soil and distributed in different soil layers; the outlet fertilizer pipe 44 is staggered 3 to 5 cm from the seeding pipe 43, and the outlet fertilizer pipe 44 is used to apply the top fertilizer to the surface of the ground, providing nutrients for the seeds discharged from the seeding pipe 43 during the seedling stage, thereby promoting the growth of seedlings during the seedling stage.

[0050] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat, characterized in that: It comprises a discharge height adjustment system (1), a ditching and soil preparation system (2), a frame fan system (3) and a seed and fertilizer simultaneous application system (4); The discharge height adjustment system (1) is connected to the frame fan system (3) via a discharge height adjustment system connecting rod (11) and a discharge height adjustment system mounting groove (31); The trenching and soil preparation system (2) is connected to the frame fan system (3) via a frame side plate (32); The seed and fertilizer co-application system (4) is connected to the frame fan system (3) via a seed and fertilizer box mounting plate (33).

2. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 1, characterized in that: The discharging height adjustment system (1) comprises a discharging height adjustment system connecting rod (11), a discharging height adjustment rod (12), and a discharging height adjustment system crossbeam (13); the discharging height adjustment system connecting rod (11) and the discharging height adjustment rod (12) are both arranged at two ends of the discharging height adjustment system crossbeam (13); the discharging height adjustment rod (12) is arranged on the inner side of the discharging height adjustment system connecting rod (11); and 10 fertilizer outlets (14) are arranged on the discharging height adjustment system crossbeam (13), and a seed outlet (15) is arranged on one side of each fertilizer outlet (14).

3. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 1, characterized in that: The furrowing and soil leveling system (2) comprises a furrowing device (21) and a soil leveling scraper (23). The furrowing device (21) is arranged at both ends of the soil leveling scraper (23). A disc harrow (22) is arranged behind the furrowing device (21). A plurality of rotary tilling blades (24) are arranged on the inner side of the soil leveling scraper (23).

4. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 1, characterized in that: The frame fan system (3) comprises a frame side plate (32) and a seed fertilizer box mounting plate (33) connected to each other, the frame side plate (32) is provided with a discharging height adjustment system mounting groove (31), the connection between the frame side plate (32) and the seed fertilizer box mounting plate (33) is provided with a frame main crossbeam (34), the frame main crossbeam (34) is provided with a gearbox (35), a fan transmission (36), and a fan (37) connected in sequence, and the fan (37) is driven by the gearbox (35) and the fan transmission (36).

5. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 4, characterized in that: The frame fan system (3) also includes a rotary tillage transmission (38), which is used to drive a rotary tillage blade (24). The rotary tillage transmission (38) is driven by a gearbox (35) driving a frame main beam (34), and the gearbox (35) is driven by a tractor PTO.

6. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 1, characterized in that: The seed-fertilizer simultaneous application system (4) comprises a horizontally arranged seeding system and a fertilizer discharge system, wherein the seeding system comprises a seed box (416), a second base fertilizer box (414) is arranged at the rear of the seed box (416), a base fertilizer discharge device (410) is arranged at the bottom of the second fertilizer box (414), a seeding motor (41) is connected to the outside of the seed box (416), a seeding device (42) is connected below the seed box (416), a seed distributor (415) is connected above the seeding device (42), and a plurality of seeding tubes (43) are arranged on the seed distributor (415).

7. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 6, characterized in that: The outlet fertilizer discharge system comprises an outlet fertilizer box (411), a bottom fertilizer box (412) is arranged at the rear of the outlet fertilizer box (411), a fertilizer discharge motor (46) is connected to the outer side of the outlet fertilizer box (411), an outlet fertilizer discharge device (45) is connected below the outlet fertilizer box (411), an outlet fertilizer distributor (413) is connected below the outlet fertilizer discharge device (45), and a plurality of outlet fertilizer discharge pipes (44) are arranged on the outlet fertilizer distributor (413); and a bottom fertilizer discharge device (410) is arranged at the bottom of the bottom fertilizer box (412).

8. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 7, characterized in that: The base fertilizer discharge device (410) includes a base fertilizer discharge pipe (47), a fertilizer discharge transmission (48), and a base fertilizer amount adjustment device (49); the base fertilizer discharge pipe (47) is connected to the bottom of the base fertilizer box one (412) and the base fertilizer box two (414); the fertilizer discharge transmission (48) and the base fertilizer amount adjustment device (49) are arranged on the seed fertilizer box mounting plate (33) outside the fertilizer discharge system.

9. The combined seeder for applying base fertilizer and feed fertilizer for both oil and wheat according to claim 8, characterized in that: The number of the seed discharging tubes (43) is 10, the number of the outlet fertilizer tubes (44) is 10, the number of the bottom fertilizer discharging tubes (47) is 8, the number of the bottom fertilizer discharging devices (410) is 10, and the outlet fertilizer tubes (44) and the seed discharging tubes (43) are transversely staggered by 3 to 5 cm.

Images