SUBSTANCE: ridger consists of spherical discs mounted symmetrically on vertical racks with the concave sides towards each other. The discs are mounted with the ability of changing the distance between them and adjustment of the angle of attack of the discs. The vertical racks are made of two parts in the form of tubes of a circular cross-section, entering one into another with the ability of rotation for the adjustment of the angle of attack of the discs and with the ability of axial displacement with fixing the parts of the rack in the predetermined positions.
EFFECT: constructive implementation enables to expand the range of adjustment in processing of row spacings at any stage of the plant growth and to reduce energy consumptions.
The invention relates to agricultural machinery, in particular to a device for hilling with soil in between rows of planting potatoes and root vegetables.
Known disk working body of tillage (see RF patent №2093973, IPC AV 23/00, publ. 27.10.1997 ), which contains axle, axle shafts associated with the axle, wheels mounted on the axle shafts with possibility of change of angle of attack and relative position.
The disadvantage of this device is the lack of adjustment of the working body - disks in a vertical plane, which limits the possibility of processing between the rows when the plants maximum growth.
Known Hiller universal (see RF patent №2125353, IPC AV 13/02, publ. 27.01.1999 ), consisting of spherical, symmetrical to the vertical racks concave sides toward each other drives with the possibility of changing the distance between them and adjusting the angle of attack of the discs. The device adopted for the prototype.
The disadvantages of the prototype are limited possibilities of adjustment. Adjustment of the working body of the discs by rotation of the axes in vertical racks. However, when you rotate the axes in the racks there is a change three settings simultaneously and in mutually exclusive directions. So, increasing the values of some parameters,�reamer angle of attack of the disks and the position of disks in a vertical plane, at the same time reduce the value of another parameter - the angle of the disks in the vertical plane, which leads to increased shedding of the soil in the furrow. This limits the possibilities of adjustment, does not allow for good formation of the ridge and, at the same time, increases traction and energy.
The ability to adjust the position of the disks in the vertical plane is limited by the need to ensure acceptable angles of disks in the vertical and horizontal planes.
The invention solves the task of providing quality formation of the ridge and lower energy costs.
The technical result obtained by carrying out the invention, consists in implementing a wide range of adjustment in the processing of row spacing at any stage of plant growth and reducing energy costs.
Said technical result is achieved in that in the Hiller disc consisting of a spherical symmetrically mounted on vertical racks concave sides toward each other drives with the possibility of changing the distance between them and adjusting the angle of attack of the discs, what is new is that the upright is made of two parts in the form of circular pipes that are members of one another can be rotated to control the angle and�Aki disks and axially move the locking parts of the rack in a given position.
The implementation of the uprights of two parts in the form of circular pipes that are members of one another can be rotated to control the angle of attack of the discs, you can:
- to provide a wide range of adjustment of the angle of attack of the disks;
- to form a ridge of soil desired profile.
For processing a light dry soil, the angle of attack is set at 30 degrees. To process heavy crude soil angle of attack is set at 15 degrees.
The possibility of axial movement by locking of the parts stand in a given position allows you to:
- significantly increase the height of the uprights Hiller, and hence the distance from the cross beam of the frame to the soil surface;
- carry out the processing of row spacing and hilling without damage to the plants even when they reach their maximum growth.
Technical solutions with the features distinguishing the claimed solution to the prototype, is not known explicitly from the prior art do not follow. This suggests that the proposed solution is new and inventive.
The invention is illustrated by drawings, where shown Hiller disk.
Hiller disc consists of a cross beam frame 1, two spherical disks 2, two uprights, collected from the upper 3 and lower 4 pipes. Top 3 stand pipe fixed to the cross�Oh beam 1 frame in one of several variants of fixation. The lower portion 4 of the pipe is attached in one of several variants of the provisions in the top tube with the fasteners 5. Spherical wheels attached to the axles 6 through the bearing Assembly 7.
Axis 6 form an angle with the bottom 4 pipe rack, selected according to test results, which provides the disk tilt in the vertical plane.
In the middle of the transverse beams of the frame 1 is formed with a bracket 8 for attachment Hiller to the walking. Fastening is performed by means of the coupling unit (Fig. not shown).
Mating parts - the upper 3 and lower 4 pipe racks have openings 9 through which pass the fastening elements for fixing the parts in the selected position. The transverse beam of the frame 1 has a number of holes 10 for inserting and fixing the upper pipe rack in one of several positions depending on the width of the aisles.
The device operates as follows.
The possibility of rotation of the lower pipe in several positions (at least 2) allows to provide a wide range of adjustment of the angle of attack of the discs 2 and the formation of a ridge of soil desired profile. For processing a light dry soil, the angle of attack is set at 30 degrees. To process heavy crude soil angle of attack is set at 15 degrees. The possibility of axial movement of the lower 4 pipe stand can significantly took�obtain the height of the uprights Hiller, consequently, the distance from the cross frame 1 to the soil surface. It enables the processing of row spacing and hilling without damage to the plants even when they reach their maximum growth. The angle of inclination of the discs 2 in a vertical plane provides for the formation of the ridge and avoids shattering of the soil back into the furrow. This parameter depends on the geometry of the disc of the diameter and curvature of the surface. Once implanted the optimal value of this angle in the future to change it is not necessary - it can be lay in the design as a constant parameter.
Fixation of the pipes 3 and 4, the stand can be made by means of fixing elements 5, passed through the corresponding holes 9 in the mating parts.
The strict symmetry of the setup disk 2 into the working position, which is ensured by precision machining parts, increases the directional stability of the disk Hiller in the works and, therefore, reduce the effort applied by the operator to the controls, and facilitates his work.
Hiller disc consisting of a spherical symmetrically mounted on vertical racks concave sides toward each other drives with the possibility of changing the distance between them and adjusting the angle of attack of the discs, characterized in that the upright �ispolneny two parts in the form of tubes of circular cross section, entering one in another can be rotated to control the angle of attack of the discs and with the possibility of axial movement by locking of the parts stand in predetermined positions.
SUBSTANCE: group of inventions relates to the field of agriculture, in particular to vegetable farming. The method is implemented by means of laying of milled soil for the formed furrows to the surface of unprocessed soil. For long-term provision of cultivated crop with accessible (capillary) water entering the soil mass with capillary porosity, formed within a long period after qualitative autumn treatment the dried surface layer of this mass id destructed and removed. Meanwhile newly formed surface layer additionally compacted, that prevents to excessive loss of capillary water. The soil with non-capillary porosity hard-worked on the usual mass making side slopes and sowing layer, forming the hole soil mass as a furrow slice. The device includes the power shaft, fixed on the frame, with interspaces between milling drums with covers, shaping furrow slices. Meanwhile it is equipped with chains fixed on the driving shaft in interspaces between the milling drums.
EFFECT: group of inventions allows to prevent an excessive loss of capillary water and for a long time to provide the cultivated crops with accessible water.
2 cl, 2 dwg
SUBSTANCE: milling chisel plough comprises a bearing frame, active milling chisel ploughs (8), a casing (10) of the milling chisel ploughs (8). The bearing frame is made articulated and consists of a main frame (1) and an additional frame (2). The additional frame (2) is kinematically connected to the main frame (1) with the remote hydraulic cylinder (7). On the main frame (1) the rippers-crust-destroyers (5) are placed. On the additional frame (2) there are sections of driven active milling chisel ploughs (8) with independent spring loaded suspension (9) and scrapers. The sections of the active milling chisel ploughs (8) are made in the form of replaceable flat discs. On both surfaces of the discs the levellers-compactors of walls and bottom of the slot are uniformly-radially rigidly fixed. The levellers-compactors of walls (11) are made in the form of rods-rough logs, the levellers-compactors of the bottom (12) - in the form of shoes in the shape of a triangular wedge with curvature of the bases. The casings (10) of the milling chisel ploughs (8) are made as casings-levellers.
EFFECT: improvement of the quality of soil slotting, moisture accumulation, maintaining the water balance of the soil.
SUBSTANCE: method includes rotary cultivation with bands and hilling. The soil of the milled band is shifted from the edges toward the center to form a central ridge array standing vertically from the upper to the lower base. The side slopes of the ridge are formed by the shift from both sides to the central ridge array of non-milled soil to obtain a ridge, which consists of vertically standing array and side slopes of equal height with different degrees of cutting the soil. The device comprises milling drums, hillers, reflectors attached on the frame with the clearance relative to each other. The reflectors are mounted behind each milling drum at its ends at an angle to it and are hingedly connected in a plane passing through the ends of the milling drum. The hillers are mounted in the clearances between the milling drums to form the ridge side slopes by shifting to the central ridge array on both sides of non-milled soil.
EFFECT: technology and design enable to create the conditions for cultivation of tuberous roots of flattened shape.
2 cl, 5 dwg
SUBSTANCE: method comprises cutting furrows, layout of tubers and embedding of them in the soil. The soil is loosened and separated into two streams on mouldboard wings. Then each stream is repeatedly loosened and the soil is separated into two streams with windows formed on the mouldboard wings, the width of which is regulated by valves. The tubers are embedded depending on the temperature regime of the soil air-permeable soil layer with the thickness of 1-2 cm. The opener comprises a rack having a breast at the lower part, left and right mouldboard wings tuber-duct. The tuber-duct is mounted at the upper part of the wings. The windows are made on the mouldboard wings. In the windows with the ability to adjust their width the L-shaped valves are mounted. The windows are placed at one-third from the rear part of the mouldboard wings. The valves are mounted from the rear part of the wings and provided with long and short sides located at an angle 120°. The valves with their short side are hingedly connected to the front part of the wings, and the vertical openings are made on the other end of the valve. Above the openings the guides are placed, which with their upper part are rigidly attached to the wings. At the lower part of each guide a threaded opening is made. In the threaded opening a regulating bolt with a conical end is mounted. At the free end of the long side of each valve a regulating handle is made.
EFFECT: technology and design enables to increase the yield of potatoes due to reducing the temperature drop in the tubers and their stolons.
2 cl, 3 dwg
SUBSTANCE: method includes crumbling soil and its displacement. The soil from the middle of row spacing to the depth of hilling is grabbed with combs and simultaneously is separated to the set structure with the surfaces of branches made along the logarithmic spiral. The prepared soil is raked and fed on the protective strip to the rows of plants, without disturbing the plants root system. From the side of the furrow along the movement of the unit, the ridges of air- and water-permeable structure are formed by moving combs mounted on rollers along cycloidal trajectory. The device comprises conical rollers which cone tips are pointed towards the furrow. The working body of the hiller of one furrow has two conical rollers along which generators the working combs are fixed. On the base of the combs the branches are rigidly fixed in a row. The working surface of the branches is made in the form of a site of logarithmic or spiral or cylindrical helix.
EFFECT: invention enables to improve the quality of the ridges soil preparation.
2 cl, 5 dwg
SUBSTANCE: group of inventions relates to agriculture. In the method of forming furrows in the soil, the existing profiles of elevation are determined for a variety of existing furrows in the geographical unit; the target elevation is determined for each of the existing furrows; and the soil is replaced in a lateral direction to or from at least one side wall along the length of each furrow to obtain the target elevation profiles within the geographical unit. The system comprises: a positioning system configured with an ability to move through the existing furrow to define an existing elevation profile along the length of the existing furrow; a working tool, which includes adjustable furrow-making tool to move the soil in the lateral direction to or from at least one sidewall of the furrow; a working vehicle, made to be movable along the groove and connected to a working tool, at that the working vehicle includes an electric processor connected to the memory, and the preservation in the memory of the existing elevation profile is ensured. At that the processor provides the calculation of the target elevation profile of the existing furrow. At that the processor is connected to an adjustable furrow-making tool and by a manageable way provides bringing it into force on the length of each furrow to receive the target elevation profile.
EFFECT: invention enables to maintain the correct slope at the bottom of the furrow for proper irrigation.
30 cl, 4 dwg
SUBSTANCE: ridge former contains passive working elements, active working element for formation of inner part of ridge, ridge-forming plate, covering cutter, casing and profiling planker. Passive working elements are made in the form of section of mouldboard hillers; at that, size of each next one is larger than that of the previous one. Active working element is made in the form of cone-shaped loosening cutters located at an angle to direction of movement and to horizontal plane. Cutter located under covering cutter includes shaft located horizontally along movement direction and blades are fixed on it. Guide shields are mounted on inner part of casing.
EFFECT: design will allow improving the quality of formed ridges during potato cultivation in climatic zones with insufficient moistening, owing to creating the ridge of aggregate structure and avoiding moisture losses during its formation.
SUBSTANCE: ridger-cultivator comprises frame, including hinged device, longitudinal beams and sides, joined by means of front and back cross beams. Frame is equipped with additional cross beam, which interacts with sides. Intermediate and side vertical rippers are installed on frame with the possibility of control in height. Rippers consist of composite stand and chisel-like knife. Upper part of stand is made in the form of plank with vertically arranged through holes and is connected by means of superimposed locking brackets with lower part. Free end of lower part is bent forward along with direction of cultivator motion and is equipped with platform. On platform there is a detachable chisel-like knife installed. Stands of intermediate rippers are fixed on longitudinal beams either in front or in back zones, or in both. Stands of side rippers are fixed either on front cross beam, or on back cross beam, or on both. On frame there are doubled intermediate and single side right and left rotation rippers arranged. Each rotary ripper consists of disk with bent knives fixed on them. Disks of rotary rippers are freely installed on axes of support forks. One end of forks in intermediate rotary rippers is hingedly installed on longitudinal beam in their front zone. One end of forks in side rotary rippers is hingedly installed on front cross beam. Other ends of forks in zone of disk supports are spring-loaded. Upper ends of springs in intermediate rippers are connected to longitudinal beams in their back zone. Upper ends of springs in side rippers are connected to sides in their back zone. Bent knives of rotary rippers with their flat surfaces are fixed on one plane of disk so that side facets of each knife are arranged on disk chords, and their free ends are bent from disk plane to create plate form. Doubled rotary rippers are fixed on axes of forks to create sharp angle, top of which is directed to the side of cultivator motion. Single side rotary rippers are turned to the side of cultivator sides. On additional cross beam there is a ridger fixed, comprising doubled middle shapers and two truncated side left and right shapers. Shapers are box-like. Each doubled shaper includes middle double-facet ploughshare with adjacent right and left extenders and central double-facet pad. Side shapers are mirror, and every of them includes truncate middle angle ploughshare, either right or left extender and truncated central pad. Each middle double-facet ploughshare is fixed on undetachable plate on its lower side, and upper side is equipped with brackets. Brackets are used to fix shapers on additional cross beam. Neighboring undetachable plates are connected with detachable plates.
EFFECT: such structural design makes it possible to reduce energy intensity of cultivator and to simplify design of its drive, to simplify assembly and disassembly of cultivator, to increase efficiency of soil cultivation, including space between rows.
5 cl, 10 dwg
SUBSTANCE: device consists of dynamic tools and two units forming rows. The units forming rows are made in the form of rotors with vertical rotation axis mounted with possibility being rotated towards each other. The outer diametre of the rotor is disposed within 396-437 mm. The rotors are mounted with possibility being rotated due to friction on soil.
EFFECT: tillage quality improvement of topsoil bearing tubers and decrease of energy consumption when forming rows.
SUBSTANCE: implement consists of a frame with support wheels and the following components mounted onto it: rotary-type tools with a ridge-like deflector installed between them, coverers and slide boards. Over the rotary-type tools there is the deflective-and-directive cover plate mounted. The ridge-like deflector is represented by rods of periodically varying length attached onto its edge and is equipped with a vibratory movement drive. Over the ridge-like deflector there is the clod smasher mounted. The clod smasher is composed of two reciprocally rotating wound rollers mounted so that to enable adjustment of the clearance between them. On the sides the clod smasher is framed by adjustable tilt angle slide boards.
EFFECT: design solution eliminates the risk of vulnerable shoots being accidentally damaged and enables formation of the optimum profile cover mound thus ensuring better clonal stock rooting.
FIELD: agriculture, in particular, fertilizer irrigation of farm crops with sewage water or liquid fertilizer.
SUBSTANCE: method involves cutting furrow by means of soil cutting tool; feeding water or liquid fertilizer into furrow and covering furrow. Uniform distribution of fertilizer applied to compound intersected relief is provided by forming web of height smaller than plowing depth by 0.4-0.7 time before supplying of water or liquid fertilizer into open furrow. Apparatus has frame with plow bodies equipped with tine having share and moldboard and fixed on frame. Web forming device mounted on frame behind outer plow body is made in the form of rotor with vertical shaft of rotation and blades for moving soil from ridges of adjacent plowed strips. Apparatus has drive. Rotor drive is kinematically connected and aligned with frame carrier wheel.
EFFECT: uniform distribution of liquid fertilizer applied into soil and equalized plant mass over the entire area of irrigated soil, increased soil fertility and improved ecology control by preventing environment from contamination.
3 cl, 5 dwg
FIELD: agricultural engineering, in particular, equipment for interrow cultivation of soil.
SUBSTANCE: coverer has moldboards formed of rods made in the form of clips of flexible material. Rods are pivotally fixed in tine. Free ends of clips rest upon ribs of adjustment mechanism allowing furrow width to be adjusted.
EFFECT: enhanced reliability in operation on stony land and wider operational capabilities.
FIELD: agricultural engineering.
SUBSTANCE: furrow cutting and closing apparatus has disk positioned for rotation about axis, first wheel positioned for rotation about wheel spindle, and second wheel positioned for rotation about wheel spindle. First and second wheels are mounted so as to contact ground on opposite sides of furrow for shifting soil onto material laid within furrow. First wheel is arranged on disk outer surface and second wheel is arranged on the side of disk inner surface. Parts of first and second wheels oriented forward of direction of advancement of apparatus are arranged between shaft of disk and its rear edge, and their lower parts are arranged forward of front edge of disk.
EFFECT: improved quality of planting.
11 cl, 15 dwg
FIELD: agricultural engineering, in particular, deep mellowing equipment.
SUBSTANCE: deep cultivator has knife-shaped tine inclined to horizontal plane and to cultivator advancement direction and equipped with front face and chisel fixed in lower part of tine. Chisel has point disposed forward of tine front face. Chisel has wear-resistant coating on its working surface. Chisel is made in the form of hollow cylinder with axis of symmetry arranged at an angle to horizontal plane. Oval-shaped part of cylinder cross-section is positioned in horizontal plane at lower part of tine to define point with sides. Sectional plane of hollow cylinder defines elliptical cutting edge. Longitudinal slot in upper part of hollow cylinder defines chisel made by bending a part of cylinder in direction of advancement of cultivator. Bent part of cylinder forms protective shield for protecting lower part of tine from hanging plant remains. Mounting openings in body of truncated part of hollow cylinder in parallel plane of oval-shaped part are adapted for joining to members disposed in lower part of tine. Chisel is joined to lower part of tine through pairs of cylindrical pins, which are detachably arranged in mounting openings and tine members having mated cylindrical surface.
EFFECT: improved quality of mellowing of soil layers and reduced consumption of power.
2 cl, 6 dwg
FIELD: agricultural engineering, in particular, equipment for constructing of slope-free cavities in wide strip irrigation of farm crops.
SUBSTANCE: apparatus has frame equipped with upright column. Shoe is arranged in lower part of tine at an angle of 15-25 deg in relation to horizontal plane. Flat hoe with clearance angle of 125-135 deg is attached to shoe. Flat hoe is furnished with left-hand and right-hand shares and mellowing device formed as tooth. Left-handed and right-handed moldboards attached to tine and to flat hoe surface are provided with cylindrical surfaces equipped with skis. Semi-helical wings are provided on ends of moldboards. Tine may be equipped with adjusting screw for rotation thereof in vertical plane around axis. Frame is equipped with automatic hitch for combining with tractor. After adjustment of apparatus, cavity cutting is performed in "floating" position of tractor hydraulic system. Cut off soil layer is moved by shares upward along internal surfaces of left-handed and right-handed moldboards and finally form cavity profile for one passage of swing chutes and semi-helical wings.
EFFECT: increased efficiency and improved quality of slope-free cavities for surface irrigation of farm crops in wide and elongated strips.
FIELD: agricultural engineering, in particular, equipment used for interrow cultivation of soil.
SUBSTANCE: working tool has curved tine, A-hoe and moldboards. Hiller moldboards are made in the form of rods. One end of each rod is bent to form L-shaped part. Rubber shock-absorber is put onto each rod. All of rods are attached to tip by means of profiled plate to increase duration of impact upon encountering of obstacle and provide for easy replacement of broken down rod due to utilization of replaceable type rods. Such construction of moldboard allows cleaning of working tool to be simplified and draft to be reduced.
EFFECT: enhanced reliability in operation on stony soil and increased efficiency.
FIELD: agricultural engineering, in particular, tillage tools.
SUBSTANCE: working tool for ridger has curved tine, A-hoe attached to curved tine, and moldboard with wings. Moldboards of working tool consist of two symmetrically arranged halves and are pivotally fixed. Pivot joints are protected from penetration of soil into zone between shields rigidly fixed to tine. Lateral loads occurring during soil tillage and transmitted to working tool are reduced upon rotation of moldboards. On encountering of obstacle, respective half of moldboard is bent aside, and working tool bypasses said obstacle with lower draft and at lower loading of constructional members. After bypassing said obstacle, the given half of moldboard returns to the initial position by means of pushing-apart spring with adjustable compression force.
EFFECT: reduced draft during engagement with obstacles such as stones, decreased lateral loading transmitted to tine, and increased service life of tool.
3 dwg, 1 ex
FIELD: agricultural engineering, in particular, equipment for preparing of soil, laying of irrigation pipeline and mulching film onto ridge having predetermined profile.
SUBSTANCE: unit has frame carrying soil rakes, ridge forming device equipped with unit for laying of irrigation pipeline located on drum, brackets for film roll, pressure wheels and coverers for spilling soil onto mulching film edges, said parts of unit being arranged in succession. Soil mellowers are disposed in front of soil rakes on frame so that spatial position thereof may be adjusted. Soil mellowers are made in the form of general-purpose and chisel-shaped mellowing A-cultivator hoes. Ridge former is equipped in its central part with leveling board movable in vertical plane and provided in its central part with roll arranged at the level of lower edge and adapted for guiding of flexible irrigation pipeline coming down from drum. Brackets for film roll are positioned on frame in succession behind roll. Perforator mounted on brackets under frame is defined by cylindrical drums located for fixed displacement on horizontal transverse shaft. Mounted on outer drums under guiding rods are pins which intersect plane of arrangement of guiding rods. Replaceable perforating knives are located on intermediate drums in spaced apart relation, with circumferential pitch being equal to seedling planting pitch.
EFFECT: wider operational capabilities and provision for creating favorable conditions for development of seedlings.
FIELD: agriculture, may be used in vegetable growing.
SUBSTANCE: method involves cutting furrows by means of hiller hoes; forming ridges by raising, turning and laying of undercut soil layers on ridge bases; grinding soil crumbs by means of rotavator knives to seeding depth; leveling and forming ridges having height below 15 cm and apex width within 15-20 cm; forming concave curvature on surface of apex of each ridge, said curvature having elliptical section, and said ridges having slopes with angles of 45-55 deg; grinding soil crumbs to sizes of about 3 mm in sowing zone on surface at the level not below 60% of ridge surfaces by means of rotavator knives; providing soil density within the range of 1.15-1.25 g/cm3 using pressure of roller. Apparatus for forming ridges comprises frame carrying sequentially arranged sections of hiller hoes, rotavation drum with housing, and roller for compacting of ridges formed. Side shields of housing serve as ridge forming members. Roller is pivotally mounted on frame by means of pressing spring-loaded bar, is positioned between side shields and has width smaller than width of ridge surfaces. Side wings of hiller hoes on landward edges are equipped with cutting plates pivotally attached to land edges and are connected with one another through tensioning mechanism allowing ridge slope angle and width to be adjusted.
EFFECT: provision for retention of atmospheric precipitations, elimination of water and wind erosion, and provision for growing of small-sized seed vegetable crops without irrigation thereof in water deficiency zones.
3 cl, 5 dwg
FIELD: agricultural engineering.
SUBSTANCE: working tool has frame comprising sequentially arranged A-hoe, furrow-forming conical screw, and planting chamber. A-hoe consists of tine, blade, and is additionally furnished with active working device consisting of two double-thread conical screws. Each conical screw is arranged at an angle to transverse-vertical and horizontal planes. Double-thread conical screws are located in bearings within rear part of A-hoe. Angle of double-thread conical screw to transverse-vertical plane is selected so that tangent drawn to outer points of screw coils is extending in parallel with rear edge of A-hoe blade. Said angle to horizontal plane is selected so that axis of double-thread conical screw positioned in rear part of A-hoe is arranged at a taper angle. Furrow-forming conical screw is positioned at an angle of 45-75 deg to horizontal plane. Mellowing knives are positioned circumferentially to helical surface of screw.
EFFECT: improved quality of mellowing and soil mixing, avoiding of furrow compaction and creation of advantageous conditions for adaptability of seedlings, and reduced draft of working tool.
3 cl, 8 dwg