CN109906716B - Corn sowing device - Google Patents
Corn sowing device Download PDFInfo
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- CN109906716B CN109906716B CN201910194685.0A CN201910194685A CN109906716B CN 109906716 B CN109906716 B CN 109906716B CN 201910194685 A CN201910194685 A CN 201910194685A CN 109906716 B CN109906716 B CN 109906716B
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Abstract
The invention provides a corn sowing device, which comprises a frame, a sowing wheel, a sowing barrel, a connecting rod, a baffle plate and a feeding pipe, wherein the frame is provided with a plurality of grooves; the sowing wheel is arranged on the frame; a plurality of sowing drums are arranged on the sowing wheel along the circumferential direction; the opening end of each seeding cylinder is provided with a guide groove, and the guide groove is an arc groove with the axis coaxial with the axis of the seeding wheel; the front side wall and the rear side wall of the seeding cylinder are respectively provided with a abdication groove; the connecting rod is arranged on the frame, the baffle is arranged at the front end of the connecting rod, the baffle is an arc-shaped plate and is coaxially distributed with the guide groove and positioned at the rear side of the sowing wheel; the seeding cylinder can pass through the baffle plate through the guide groove and the baffle plate blocks the opening end, and can pass through the connecting rod through the abdication groove; the feeding pipe is arranged on the rack and provided with a switch; when the seeding cylinder rotates to the position right above the axis of the seeding wheel, the seeding cylinder is aligned with the lower end of the feeding pipe. The corn seed sowing device can uniformly sow corn seeds and effectively avoid the condition of missing sowing so as to improve corn sowing efficiency.
Description
Technical Field
The invention relates to the technical field of corn sowing apparatuses, in particular to a corn sowing device.
Background
Corn is an annual herb of the genus corn of the family Gramineae. The cultivation history of corn in our country has been about 470 years. At present, the corn sowing area in China is about 3 hundred million mu, which is inferior to rice and wheat, and the corn sowing area in China is the third place in grain crops. The demands of China on the total amount of corns are still increasing, so the corn planting industry also needs to be continuously developed and advanced, and the replacement of manual operation by mechanical equipment is a key point of the development of the corn planting industry. In the corn planting process, the sowing is a very critical step, the sowing operation is large in workload, and the sowing uniformity can also have a great influence on the growth of corn.
With the development of corn planting industry, corn sowing starts to develop from traditional manual sowing and animal-drawn sowing to mechanized sowing. At present, when the seeder is used for corn seeding operation through a seeding device, the conditions of uneven seeding and missing seeding are easy to occur, so that subsequent manual inspection is needed, and seedling supplementing and picking work is carried out, so that the corn seeding efficiency is greatly affected, and a large obstacle is caused to the mechanized development of corn seeding.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims at: aiming at the problems in the background technology, the corn sowing device is provided, thereby overcoming the defect that the sowing device of the existing corn sowing machine is easy to have uneven sowing and missing sowing.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a corn sowing device comprises a frame, a sowing wheel, a sowing barrel, a connecting rod, a baffle plate and a feeding pipe; the sowing wheel is rotatably arranged on the frame and is driven to rotate by a rotating mechanism; the seeding wheel is uniformly provided with a plurality of seeding cylinders along the circumferential direction, each seeding cylinder is provided with a square seed cavity, and one end of each seed cavity, which is far away from the seeding wheel, is an open end provided with an opening; the opening end of each seeding cylinder is provided with a guide groove penetrating through the front side wall and the rear side wall of the seeding cylinder, and the guide grooves are arc grooves with axes coaxially distributed with the axes of the seeding wheels; the front side wall and the rear side wall of the seeding barrel are respectively provided with a yielding groove, the lower ends of which are communicated with the guide grooves, and the upper ends of the yielding grooves are open; the connecting rod is arranged on the frame, the baffle is arranged at the front end of the connecting rod, the baffle is an arc-shaped plate, and the baffle and the guide groove are coaxially distributed and positioned at the rear side of the sowing wheel; when any one of the sowing cylinders rotates along with the sowing wheel to pass through the position corresponding to the baffle plate, the sowing cylinder passes through the baffle plate through the guide groove and the baffle plate blocks the opening end of the seed cavity, and the sowing cylinder passes through the connecting rod through the abdication groove; the open end of the seed cavity is still directed rearward and upward when the guide groove of the seeding barrel is inserted into the upper end of the baffle plate, and is directed downward when the guide groove of the seeding barrel is separated from the lower end of the baffle plate; the feeding pipe is arranged on the rack, and a switch is arranged on the feeding pipe; when any one of the sowing cylinders rotates along with the sowing wheel to be positioned right above the axis of the sowing wheel, the sowing cylinder is aligned with the lower end of the feeding pipe.
Further preferably, the number of the sowing barrels is six.
Still further preferably, the switch is an electromagnetic valve, and the feeding pipe is provided with a counter below the switch.
Still further preferably, the frame is provided with a seed guide pipe right above the axis of the sowing wheel, the middle part of the seed guide pipe is provided with an inlet, and the lower end of the feed pipe is connected with the inlet; the inlet is controlled to be opened and closed by a linkage mechanism; the linkage mechanism comprises a U-shaped rod, a top block and a spring; the opening of the U-shaped rod faces downwards, the lower part of the rear side rod of the U-shaped rod is sleeved in the seed guide tube in a manner of being capable of sliding up and down, and the middle part of the front side rod of the U-shaped rod is sleeved on the frame in a manner of being capable of sliding up and down; the jacking block is arranged at the lower end of the front side rod of the U-shaped rod, the spring is clamped between the upper end of the jacking block and the frame, and the jacking block can be jacked upwards when the seeding cylinder rotates to a position corresponding to the jacking block along with the seeding wheel; when any one of the sowing cylinders rotates with the sowing wheel to be located right above the axis of the sowing wheel so as to be aligned with the lower end of the seed guide tube, the next sowing cylinder to be rotated right above the axis of the sowing wheel lifts the jacking block upwards to the lower end of the left side rod of the U-shaped rod higher than the inlet of the seed guide tube.
Compared with the prior art, the invention has the beneficial effects that:
(1) When the seeding cylinder rotates to the position right above the axis of the seeding wheel along with the anticlockwise direction of the seeding wheel, the lower end of the feeding pipe is convenient to align, so that corn seeds can be thrown into the seed cavity of the seeding cylinder through the feeding pipe; the planter box then continues to rotate counterclockwise to pass the location of the baffles. When the guide groove of the seeding barrel is just inserted into the upper end of the baffle plate, the opening end of the seed cavity is still towards the rear upper side, so that the opening end of the seed cavity is blocked by the baffle plate before the opening end of the seed cavity is downwards, and seeds in the seed cavity cannot leak out; when the guide way just leaves the lower extreme of baffle, the open end in kind chamber is the orientation below, and the seed in the kind chamber just drops in the seeding hole under the effect of gravity, can prevent effectively like this to lead to corn seed to pop out in advance from kind chamber because of jolting vibrations to realize sowing uniformly, and effectively prevent the condition of missing to sow, in order to improve corn sowing's efficiency.
(2) The invention is provided with a seed guide pipe and a linkage mechanism which correspond to the feed pipe, when any one sowing cylinder rotates anticlockwise along with the sowing wheel to be positioned right above the axis of the sowing wheel so as to be aligned with the lower end of the seed guide pipe, the next sowing cylinder which is to be rotated right above the axis of the sowing wheel rotates to a position corresponding to the jacking block, and the jacking block is jacked upwards to the lower end of the front side rod of the U-shaped rod and is higher than the inlet of the seed guide pipe, so that the feed pipe can be ensured to accurately throw corn seeds into the seed cavity of the sowing cylinder, and the missing sowing is further avoided.
Drawings
FIG. 1 is a schematic view of the corn sowing device of the present invention;
FIG. 2 is a schematic view of the structure of a sowing barrel of the corn sowing device of the present invention;
FIG. 3 is a schematic view of the structure of the corn planter in accordance with the present invention as the planter box rotates past a position corresponding to the baffles;
the main reference numerals illustrate:
1-frame, 2-sowing wheel, 3-sowing barrel, 4-connecting rod, 5-baffle, 6-feeding pipe, 7-seed cavity, 8-guide slot, 9-abdication slot, 10-switch, 11-counter, 12-seed guiding pipe, 13-U-shaped rod, 14-top block and 15-spring.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As shown in fig. 1, the present invention provides a corn sowing device comprising a frame 1, a sowing wheel 2, a sowing barrel 3, a connecting rod 4, a baffle 5 and a feed pipe 6. As shown in fig. 1, the sowing wheel 2 is rotatably provided on the frame 1, and the sowing wheel 2 is driven to rotate by a rotation mechanism, the axis of the sowing wheel 2 is distributed in the left-right direction, and the sowing wheel 2 is rotated in the counterclockwise direction when in operation. The sowing wheel 2 can be driven to rotate by a motor as a rotating mechanism, and if the sowing wheel 2 is installed on the sowing machine along with the frame 1, the sowing wheel 2 and the travelling wheel of the sowing machine can be connected through a chain transmission mechanism and the like, so that the sowing wheel 2 and the travelling wheel of the sowing machine are linked.
As further shown in fig. 1, the sowing wheel 2 is provided with a plurality of sowing drums 3 uniformly in the circumferential direction, one end of each sowing drum 3 is fixed to the outer circumferential surface of the sowing wheel 2, and the other end extends to the outside away from the sowing wheel 2. Alternatively, the number of sowing cartridges 3 is six. As shown in fig. 2, each sowing cylinder 3 is provided with a square-shaped seed cavity 7, and the sowing cylinder 3 may also be square-shaped. The end of the seed cavity 7 remote from the sowing wheel 2 is an open end provided with an opening from which corn seeds can enter or be discharged. The open end of each seeding section of thick bamboo 3 is provided with a guide way 8 that runs through its front and back two lateral walls, and guide way 8 is the coaxial arc wall that distributes of axis and the axis of seeding wheel 2, and the centre of a circle of guide way 8 is unanimous with the centre of a circle of seeding wheel 2 promptly, and the diameter of guide way 8 is greater than the diameter of seeding wheel 2. The front side wall and the rear side wall of the seeding barrel 3 are respectively provided with a yielding groove 9 with the lower end communicated with the guide groove 8, and the upper end of the yielding groove 9 is opened, so that the yielding groove 9 and the guide groove 8 are connected on the same side wall to form an inverted T shape. The connecting rod 4 is arranged on the frame 1, the baffle 5 is arranged at the front end of the connecting rod 4, and the number of the connecting rods 4 can be two and are distributed up and down. The baffle plate 5 is an arc plate, and the baffle plate 5 and the guide groove 8 are coaxially distributed on the rear side of the sowing wheel 2, and the diameter of the baffle plate 5 corresponds to that of the guide groove 8. As shown in fig. 3, when any one of the sowing cylinders 3 rotates counterclockwise along with the sowing wheel 2 through the position corresponding to the baffle plate 5, the sowing cylinder 3 passes through the baffle plate 5 through the guide groove 8 and the open end of the seed cavity 7 is blocked by the baffle plate 5, and the sowing cylinder 3 passes through the connecting rod 4 through the abdicating groove 9, so that the connecting rod 4 and the baffle plate 5 do not affect the rotation of the sowing cylinder 3, but also can block the open end of the seed cavity 7, and seeds in the seed cavity 7 are prevented from leaking. When the guide groove 8 of the seeding barrel 3 is inserted into the upper end of the baffle plate 5, the opening end of the seed cavity 7 is still towards the upper rear direction, and when the guide groove 8 of the seeding barrel 3 leaves the lower end of the baffle plate 5, the opening end of the seed cavity 7 is towards the lower side, and then seeds can drop downwards from the seed cavity 7. The upper end of the baffle 5 may be made higher than the axis of the sowing wheel 2, and the lower end of the baffle 5 is located directly below the axis of the sowing wheel 2. As further shown in fig. 2, the left and right sides of the guide groove 8 may be recessed into the left and right side walls of the seeding barrel 3, respectively, so that when the baffle 5 is inserted into the guide groove 8, the left and right sides of the baffle 5 are respectively clamped on the left and right side walls of the seeding barrel 3, thereby improving the sealing property.
As shown in fig. 1, the feeding pipe 6 is arranged on the frame 1 and above the sowing wheel 2, and a switch 10 is arranged on the feeding pipe 6, the feeding pipe 6 can be connected with a corn seed storage container, and corn seeds can fall from the feeding pipe 6 to the scaring direction by opening the switch 10. When any one of the sowing cylinders 3 rotates along with the sowing wheel 2 to be positioned right above the axis of the sowing wheel 2, the sowing cylinders are aligned with the lower end of the feeding pipe 6, at the moment, the switch 10 is turned on, and corn seeds can be put into the seed cavity 7 from the opening end of the sowing cylinder 3 for temporary storage. Optionally, the switch 10 is an electromagnetic valve, the feeding pipe 6 is provided with a counter 11 below the switch 10, and corn seeds can be accurately thrown into each sowing barrel 3 by intermittently controlling the switch 10 to be opened and closed and calculating fallen corn by the counter 11, so that omission is avoided. As shown in fig. 1, optionally, the frame 1 is provided with a seed guide pipe 12 right above the axis of the sowing wheel 2, the middle part of the seed guide pipe 12 is provided with an inlet, the lower end of the feed pipe 6 is connected with the inlet, and seeds coming out from the feed pipe 6 pass through the seed guide pipe 12 and are put into the seed cavity 7 of the sowing barrel 3. The inlet is controlled to be opened and closed through a linkage mechanism, so that corn seeds are controlled to drop downwards and be thrown into the sowing cylinder 3. The linkage mechanism comprises a U-shaped rod 13, a top block 14 and a spring 15. The U-shaped bar 13 is open downward and is formed by connecting a rear side bar, a cross bar and a front side bar. The lower part of the rear side rod of the U-shaped rod 13 is sleeved in the seed guide tube 12 in a mode of being capable of sliding up and down, and the middle part of the front side rod of the U-shaped rod 13 is sleeved on the frame 1 in a mode of being capable of sliding up and down, and the lower end of the front side rod penetrates through the frame 1 and then extends downwards to the front upper part of the sowing wheel 2. The ejector block 14 is arranged at the lower end of the front side rod of the U-shaped rod 13 and corresponds to the sowing barrel 3, the spring 15 is clamped between the upper end of the ejector block 14 and the frame 1, and when the ejector block 14 is not jacked, the ejector block 14 is pushed downwards by the spring 15, so that the U-shaped rod 13 moves downwards to the lower end of the rear side rod to block the opening of the seed guide tube 12, and corn seeds in the feeding tube 6 cannot enter the seed guide tube 12. The seeding drum 3 can jack up the jack block 14 when rotating to a position corresponding to the jack block 14 along with the seeding wheel 2. When any one of the sowing drums 3 rotates to be located directly above the axis of the sowing wheel 2 so as to be aligned with the lower end of the seed guide tube 12 with the sowing wheel 2, the next sowing drum 3 to be rotated to be located directly above the axis of the sowing wheel 2 lifts the jack block 14 upward to the lower end of the rear side lever of the U-shaped lever 13 higher than the inlet of the seed guide tube 12. Since the sowing wheel 2 is rotated counterclockwise, the next sowing cylinder 3 is the next preceding sowing cylinder 3. When the sowing wheel 2 continues to rotate so that the sowing cylinder 3 located directly above the axis of the sowing wheel 2 leaves, the next sowing cylinder 3 passes over the top block 14 and the spring 15 drops the U-shaped bar 13 again to the lower end of the rear side bar below the inlet. Thus, after the rear side rod of the U-shaped rod 13 blocks the inlet, the switch 10 of the feeding pipe 6 is turned on briefly and then turned off immediately, so that corn seeds at the inlet are waiting. When any one of the sowing drums 3 rotates anticlockwise along with the sowing wheel 2 to be positioned right above the axis of the sowing wheel 2 so as to be aligned with the lower end of the seed guide tube 12, the next sowing drum 3 which is to be rotated right above the axis of the sowing wheel 2 rotates to a position corresponding to the jacking block 14, the jacking block 14 is jacked upwards to the lower end of the rear side rod of the U-shaped rod 13 to be higher than the inlet of the seed guide tube 12, and after the U-shaped rod 13 is jacked to open the inlet, the waiting seeds can enter the seed guide tube 12 immediately and drop downwards to be put into the seed cavity 7 of the aligned sowing drum 3 for storage, so that the corn seed putting accuracy is ensured, the corn seeds can be accurately obtained in each sowing drum 3, and the missing sowing is effectively avoided.
When the seeding drum 3 rotates to the position right above the axis of the seeding wheel 2 along with the anticlockwise direction of the seeding wheel 2, the opening end of the seed cavity 7 faces to the right above and is aligned with the lower end of the feeding pipe 6, so that corn seeds are thrown into the seed cavity 7 of the seeding drum 3 through the feeding pipe 6, and when the seed guide pipe 12 and the linkage mechanism are arranged, the feeding pipe 6 throws corn seeds into the seed cavity 7 of the seeding drum 3 through the seed guide pipe 12; the sowing drum 3 then continues to rotate anticlockwise to pass the position of the barrier 5. When the guide groove 8 of the seeding barrel 3 is just inserted into the upper end of the baffle plate 5, the opening end of the seed cavity 7 is still towards the rear upper side, so that the opening end of the seed cavity 7 is blocked by the baffle plate 5 before facing downwards, and seeds in the seed cavity 7 cannot leak out; when the guide groove 8 just leaves the lower end of the baffle plate 5, the opening end of the seed cavity 7 is downward, and seeds in the seed cavity 7 fall into a sowing pit under the action of gravity, so that corn seeds can be effectively prevented from being sprung out of the seed cavity 7 in advance due to jolt vibration, uniform sowing is realized, and the condition of missing sowing is effectively prevented, so that the corn sowing efficiency is improved.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (2)
1. The corn sowing device is characterized by comprising a frame, sowing wheels, sowing barrels, connecting rods, baffles and feeding pipes;
the sowing wheel is rotatably arranged on the frame and is driven to rotate by a rotating mechanism; the seeding wheel is uniformly provided with a plurality of seeding cylinders along the circumferential direction, each seeding cylinder is provided with a square seed cavity, and one end of each seed cavity, which is far away from the seeding wheel, is an open end provided with an opening; the opening end of each seeding cylinder is provided with a guide groove penetrating through the front side wall and the rear side wall of the seeding cylinder, and the guide grooves are arc grooves with axes coaxially distributed with the axes of the seeding wheels; the front side wall and the rear side wall of the seeding barrel are respectively provided with a yielding groove, the lower ends of which are communicated with the guide grooves, and the upper ends of the yielding grooves are open;
the connecting rod is arranged on the frame, the baffle is arranged at the front end of the connecting rod, the baffle is an arc-shaped plate, and the baffle and the guide groove are coaxially distributed and positioned at the rear side of the sowing wheel; when any one of the sowing cylinders rotates along with the sowing wheel to pass through the position corresponding to the baffle plate, the sowing cylinder passes through the baffle plate through the guide groove and the baffle plate blocks the opening end of the seed cavity, and the sowing cylinder passes through the connecting rod through the abdication groove; the open end of the seed cavity is still directed rearward and upward when the guide groove of the seeding barrel is inserted into the upper end of the baffle plate, and is directed downward when the guide groove of the seeding barrel is separated from the lower end of the baffle plate;
the feeding pipe is arranged on the rack, and a switch is arranged on the feeding pipe; when any one of the seeding cylinders rotates along with the seeding wheel to be positioned right above the axis of the seeding wheel, the seeding cylinder is aligned with the lower end of the feeding pipe;
the frame is provided with a seed guide pipe right above the axis of the sowing wheel, the middle part of the seed guide pipe is provided with an inlet, and the lower end of the feed pipe is connected with the inlet; the inlet is controlled to be opened and closed by a linkage mechanism; the linkage mechanism comprises a U-shaped rod, a top block and a spring;
the opening of the U-shaped rod faces downwards, the lower part of the rear side rod of the U-shaped rod is sleeved in the seed guide tube in a manner of being capable of sliding up and down, and the middle part of the front side rod of the U-shaped rod is sleeved on the frame in a manner of being capable of sliding up and down;
the jacking block is arranged at the lower end of the front side rod of the U-shaped rod, the spring is clamped between the upper end of the jacking block and the frame, and the jacking block can be jacked upwards when the seeding cylinder rotates to a position corresponding to the jacking block along with the seeding wheel; when any one of the sowing cylinders rotates with the sowing wheel to be positioned right above the axis of the sowing wheel so as to be aligned with the lower end of the seed guide pipe, the next sowing cylinder to be rotated right above the axis of the sowing wheel lifts the jacking block upwards to the lower end of the left side rod of the U-shaped rod to be higher than the inlet of the seed guide pipe;
the number of the sowing barrels is six.
2. The corn seeding apparatus according to claim 1, wherein the switch is a solenoid valve, and the feed tube is provided with a counter below the switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910194685.0A CN109906716B (en) | 2019-03-14 | 2019-03-14 | Corn sowing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910194685.0A CN109906716B (en) | 2019-03-14 | 2019-03-14 | Corn sowing device |
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| CN109906716A CN109906716A (en) | 2019-06-21 |
| CN109906716B true CN109906716B (en) | 2023-07-07 |
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| CN201910194685.0A Active CN109906716B (en) | 2019-03-14 | 2019-03-14 | Corn sowing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111418451B (en) * | 2020-05-15 | 2021-09-21 | 重庆尚八斗生态农业有限公司 | Transplanting method of leymus chinensis |
| CN111670651B (en) * | 2020-06-08 | 2022-03-18 | 农业农村部南京农业机械化研究所 | Array agricultural material discharge mechanism and discharge device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2098788U (en) * | 1991-06-17 | 1992-03-18 | 张炳福 | Fertilizer applying dibbler |
| JP2582516Y2 (en) * | 1992-02-04 | 1998-10-08 | ヤンマー農機株式会社 | Seeding machine |
| CN101933420A (en) * | 2010-08-07 | 2011-01-05 | 高新义 | Single-kernel seed-metering device for grains |
| US9516804B1 (en) * | 2015-02-26 | 2016-12-13 | Derek Djeu | Vacuum seeder |
| CN205694194U (en) * | 2016-06-23 | 2016-11-23 | 云南农业大学 | Device is broadcast in a kind of Novel rice rolling |
| CN205830314U (en) * | 2016-06-24 | 2016-12-28 | 天津市建国蔬菜种植专业合作社 | A kind of seeder |
| CN107580833A (en) * | 2017-11-08 | 2018-01-16 | 刘帮银 | Jet seeder |
| CN109005785A (en) * | 2018-08-13 | 2018-12-18 | 陈伟 | A kind of adjustable corn drill of application rate |
| CN109220094A (en) * | 2018-11-19 | 2019-01-18 | 张留兴 | A kind of precision seeding machine |
| CN209824401U (en) * | 2019-03-14 | 2019-12-24 | 广西壮族自治区农业科学院玉米研究所 | Corn seeding device |
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Effective date of registration: 20230419 Address after: No. 174, Daxue East Road, XiXiangTang District, Nanning City, Guangxi Zhuang Autonomous Region Applicant after: GUANGXI ZHUANG AUTONOMOUS REGION ACADEMY OF AGRICULTURAL SCIENCES Address before: No.174, Daxue East Road, XiXiangTang District, Nanning, Guangxi 530004 Applicant before: MAIZE Research Institute GUANGXI ACADEMY OF AGRICULTURAL SCIENCES |
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