373 results about "Land leveling" patented technology

The invention provides a seedling raising and planting method of tree honeysuckle. The seedling raising method comprises land leveling and ridge furrowing, pest control and disinfection, selection and handling of cuttings, cuttage, transplanting, shed erecting, and rooting reagent spraying; and the planting method comprises selection of a planting base, arrangement of the planting base, planting time, planting method, field management, tree shape cultivation, pest and disease control, reasonable use of pesticides, harvesting, processing and drying. Seedlings which do not carry the virus and have strong disease resistance are rapidly propagated at high temperature and humidity, and are cultivated into semiligneous tree honeysuckle by a field planting method such as scientific pruning and fertilization. Through the method, the honeysuckle blows for 4-5 times, the bud opening time is long, and the yield is high; the yield of the dried product is 400-500 g per tree on average, the survival rate of seedlings is 98%, and the tree age is 30-50 years; and the economic benefit is about 15,000 yuan / mu, and ideal seedlings of returning farmland to forest have well-developed root systems.

The invention discloses a gingko planting method and belongs to the technical field of traditional Chinese medicine planting. The method comprises the steps of 1) land selection and preparation including land selection, fertilizer application, land leveling, ploughing and bedding; 2) seedling cultivation including seed collection, breeding nursery garden construction and seedling planting: 3) transplantation and planting including seeding hole digging, fertilizer application, transplantation at a male-female ratio of 95:5, soil covering and watering; 4) field management including intertillage, topdressing, pruning and pollination; 5) insect and disease prevention. According to the gingko planting method, during the leveling process, acid modifier composed of vinegar residue and decomposed straw fertilizer is applied, so that gingko can be planted and grow in saline-alkali soil, and further compared with the situation that saline-alkali soil is unsuitable for growth of gingko in the prior art, the gingko planting method widens the gingko planting area. The gingko planting method also has the advantages of being high in emergence rate, high in seedling disease resistance and the like.

The invention relates to a comprehensive restoration method for a salt-alkali degraded marsh wetland in a plain area, in particular to a restoration method for the salt-alkali degraded marsh wetland, and solves the problem that a satisfactory effect cannot be achieved as a land leveling technology, a hydrologic control technology or a wetland plant cover restoration technology is singly used in the conventional restoration process for the salt-alkali degraded marsh wetland in the plain area. The comprehensive restoration method comprises the steps as follows: 1, leveling land; 2, hydrologically controlling the salt-alkali degraded marsh wetland to be restored in the plain area; and 3, carrying out plant cover technology treatment on the salt-alkali degraded marsh wetland in the plain area. The comprehensive restoration method can be applied to the field of a restoration project for the salt-alkali degraded marsh wetland in the plain area.

The invention relates to a land leveling device for driving a circular drive disc by a worm gear. The land leveling device comprises a frame (9), wherein a front rotating shaft (6) and a rear rotating shaft (5) are respectively mounted on the front part and the rear part of the frame (9); spline shafts are arranged on the middle parts of the front rotating shaft (6) and the rear rotating shaft (5); a left limiting bulge (51) and a right limiting bulge (52) are arranged at the two ends of each spline shaft; a front rotary tillage leveling device (4) and a rear rotary tillage leveling device (3) are axially mounted in a sliding manner on the spline shafts of the front rotating shaft (6) and the rear rotating shaft (5) between the left limiting bulges (51) and the right limiting bulges (52); driving belt wheels (53, 54) are mounted on two end faces of the front rotating shaft (6) and the rear rotating shaft (5); the driving belt wheels (53, 54) can drive the front rotary tillage leveling device (4) and the rear rotary tillage leveling device (3) to rotate.

The invention discloses a method for improving coastal saline soil by gathering rain water and suppressing evaporation. The method comprises the following steps: 1) fertilization: applying organic fertilizers and superphosphate; 2) plough: ploughing the soil to a depth of 15 to 30; 3) cofferdam building and land leveling: raising a network of soil ridges to form land pieces in different sizes and leveling each land piece encircled by the ridges; 4) covering plastic film: covering each land piece encircled by the ridges with a plastic film which has a plurality of pores for allowing rain water to flow into soil to wash off salts in the soil; 5) planting sesbania in the pores which can fertilize soil, cover plant residue, reduce land-surface evaporation and slow down the aging of the plastic film. The method, when large amount of fresh water is not available, can use rain water and a rain water gathering and evaporation suppressing agricultural technology to reduce salt content in the coastal saline soil effective and improve and use the coastal saline soil.

The invention relates to a method for improving soil saline alkali, belongs to the technical field of soil adjustment methods and mainly solves the problems of poor soil saline alkali improvement effects, small improvement saline alkali soil areas and low unit yields in the prior art. The method comprises fifteen steps of land flattening, seedling bed arranging, land leveling, alkali washing, alkali pressing, seed selection, seed sowing and seedling raising, greenhouse building, ventilation and temperature management, seedling water management, seedling pest control, land beating leveling, seedling transplanting, tillering stage management and booting and earing period management. By the aid of the method, by means of autotetraploid rice planting, water management strengthening, organic fertilizer increasing, integrated control of plant diseases and insect pests and land management, the soil saline alkali is improved apparently, the saline-alkali soil is improved in large area, and the yield per unit is high.

The invention discloses a land leveling method, a land leveling control device and a land leveling device. The land leveling method comprises: obtaining the position information of the position to be leveled in real time through a receiving mechanism based on a satellite positioning system, wherein the position information includes at least an elevation value ;Comparing the elevation value with the preset reference elevation to generate a leveling control signal; controlling the land leveling operation of the leveling mechanism according to the leveling control signal, so as to level the land to the preset reference elevation. The land leveling method is based on the satellite positioning system to obtain the elevation value of the position to be leveled in real time and compare it with the preset reference elevation to generate a leveling control signal to control the leveling operation of the leveling mechanism. The operation range is not limited, and any area of ​​the leveling ground can be used. blocks for land leveling.

The invention discloses a Beidou navigation unmanned full-hydraulic tractor and a control method thereof, comprising a tractor body, a hydraulic system, a sensor integration system, a control system and a Beidou GPS navigation system. A Beidou navigation unmanned full-hydraulic multifunctional tractor, which has multiple functions such as deep plowing, subsoiling, planting, fertilization, land leveling, field management, etc., overcomes the single-function defect of existing agricultural tractors, and its control method realizes It can walk, avoid obstacles, turn, and operate autonomously in different terrains and landforms 24 hours a day.

The invention relates to a method for vegetation restoration in ecological fragile zones of coastal heavy saline-alkali soil. The method includes the steps of (1) land leveling and ploughing and loosening: ploughing land by 30 cm, breaking up clods, ridging according to plots, and leveling land to enable height difference not to exceed 5cm; (2) selection and application of soil bacterial manure: adopting one of gold probiotics bacterial manure or a Frisol A+F microbial agent; and (3) vegetable planting or growing. The method has the advantages that a saline-alkali soil improvement effect is remarkable, salinity in high saline-alkali soil is reduced effectively within a short time (within a growing season), secondary alkalization is prevented, soil fertility is improved, microfloras are established, soil ripening is quickened, progress of vegetation restoration of the heavy saline-alkali soil is accelerated, vegetable survival rate in the current year is ensured to be above 95%, cost is lowered, and the method is a biological saline-alkali soil improvement measure with water resources saved.

The invention discloses an agricultural multifunctional cultivator. The agricultural multifunctional cultivator comprises a mounting plate, a cultivating device, a sowing and fertilizing device, a land leveling device and a water spraying device, the cultivating device comprises an electric push rod, a first supporting plate, a furrow plough and a rotary tillage plough, the sowing and fertilizingdevice comprises a seed box, a fertilizer box, a feeding roller, a discharging roller and a land digging hoe, and the water spraying device comprises a water box, a water pump, a second motor, a firstgear, a second gear and an L-shaped pipe. The agricultural multifunctional cultivator is provided with the cultivating device, the furrow plough turns soil up, the rotary tillage plough smashes largebulky soil, by controlling a telescopic rod of the electric push rod to extend or retract, the height of the furrow plough and the height of the rotary tillage plough can be adjusted, and then the cultivating depth can be adjusted to meet different agricultural requirements; the cultivator is provided with the sowing and fertilizing device, sowing and fertilizing are conducted while cultivating is conducted, the work efficiency is improved, and the labor intensity of staff is lowered; the cultivator is provided with the water spraying device, the spraying range is expanded, and the work efficiency is improved.

The invention discloses a reclamation method for rural residence lands on a coastal saline land region. The method includes the first step that building rubbish of the waste residence lands is cleared out; the second step that land leveling is performed on a reclamation area; the third step that water-salt control is performed, according to road planning, the treated reclamation area is divided into land blocks, new irrigation and drainage projects are constructed, and subsurface drainage pipes, water-collecting pipes and water-collecting wells are laid; the fourth step that biological improvement projects are constructed, organic fertilizer and planting green manure are applied to increase the content of organic materials and microorganisms in soil, improve the activity of the soil and complete soil reclamation of the residence lands. According to the method, the residence lands wasted in rural districts are reclaimed into cultivated lands, the utilization rate of the lands is improved, the agricultural acreage is increased, the technologies of land arrangement, water-salt control and biological improvement are organically integrated, and therefore the soil productivity of the residence land can be effectively recovered and farm land ecological environment can be improved. Thus, the reclamation method for the rural residence lands on the coastal saline land region is a practical technology method.

The invention relates to an overall jacking construction method for a large-area bolt-sphere net rack. The overall jacking construction method for the large-area bolt-sphere net rack comprises the following steps of (1) determining the position of an assembled plane, and performing land-leveling operation and location paying off; (2) assembling the bolt-sphere net rack on the ground; (3) uniformly arranging large net rack short-distance lifting appliances at supporting points on the upper portion of the bolt-sphere net rack; (4) mounting jacking supports and hydraulic jacks at various jacking supporting points on the lower portion of the bolt-sphere net rack; (5) maintaining bolt-sphere net rack supporting structures on all the jacking supporting points at the same horizontal position; (6) mounting net rack overall jacking difference value measuring devices at the positions of the jacking supports; (7) jacking primarily; and (8) jacking normally. By the overall jacking construction method for the large-area bolt-sphere net rack, overall primary jacking of the net rack is realized, synchronism of the various jacks in an overall jacking process is guaranteed, and skewing of the bolt-sphere net rack due to uneven stress can be avoided.

The invention discloses a laser land leveling control device and method. The device comprises a traction unit (20), a supporting wheel (4), a land leveling blade (16), a laser emitter (1), a laser receiver (5), a laser receiver lifting unit (6) and a controller (15), wherein the laser receiver lifting unit (6) is used for bearing the laser receiver (5) and the controller (15) is used for controlling lifting and falling of the laser receiver (5) and the land leveling blade (16). The invention overcomes the defect that the leveling operation efficiency is low because the vehicle is repeatedly stopped to adjust the height of the receiver, solves the problem that the tractor engine or the land leveling blade is damaged because of excessive load, avoids land heaving caused by slow response of a land leveling system after the supporting wheel of the land leveling blade is raised too high from reducing the land leveling operation quality, and realizes efficient and accurate land leveling operation.

The invention provides a channel drainage basin renovation planning simulating method and system based on an OSG. The method comprises the following steps that a three-dimensional channel drainage basin terrain model based on a digital elevation model (DEM) is constructed, the soil landform layers and the landform characteristic lines of the channel drainage basin are extracted, recognized and visually simulated, the two-dimensional section and the three-dimensional section of the channel drainage basin terrain are dynamically extracted and drawn and rendered in real time, land levelling rendering is performed through the earth volume calculated by the DEM, multiple crop and plant models, basic farmland farming modes and engineering facility models are built, and dynamic loading, replacing, moving and deleting of the models are controlled through a man-machine interaction mechanism. According to the method, the problems of extracting, recognizing and visual stimulating on the important landform features and the soil landform layers of the channel drainage basin and extracting and drawing on the terrain sections are effectively solved, the true conditions of the natural terrain of the channel drainage basin are presented, and a visualization decision making support method for performing man-machine coordination design in the channel drainage basin renovation planning process is supplied.

The invention discloses a main valve of a small type hydraulic excavator with energy-saving excavation and high-efficient land leveling, an inlet of a land leveling mode selecting valve (4) is connected with a bulldozer shovel linkage (3), one outlet of the land leveling mode selecting valve (4) is connected with a moving arm 2 / breaking hammer linkage (5), the other outlet is connected with an oil return passage T2, one end of a passage (12) is connected with a dipper handle 1 linkage (6), and the other end is connected with a bucket linkage (10). The land leveling mode selecting valve (V4) is increased in the main valve, when the pilot pressure is acted on the land leveling mode selecting valve, the land leveling mode is started, and oil of a P3 pump can be supplied for a dipper handle and a bucket, thereby accelerating the land leveling speed and realizing the high efficiency; when in the excavation mode, the main valve can change the way of leading the traditional P3 pump to participate in confluence, use a P1 pump and a P2 pump for realizing the confluence to the dipper handle, and supply the oil to the dipper handle and the moving arm, thereby avoiding the excess flow loss of the P3 pump and achieving the energy-saving effect.

The invention discloses an efficient pollution-free cultivation method for white ginger in a greenhouse. The method is characterized by comprising the following steps: (1) selection of a cultivation land; (2) selection of seed ginger; (3) disinfection and germination acceleration of seed ginger; (4) land leveling and fixed planting; (5) field management which comprises water and fertilizer management, irrigation and drainage management and temperature management; (6) pest control; and (7) harvesting. According to the efficient pollution-free cultivation method for white ginger in the greenhouse disclosed by the invention, obtained ginger blocks are large in size, free of pesticide residue and good in quality. As fresh ginger can be harvested in May and June which are just a period of short of supply of goods, the method has a relatively high economical benefit and solves the defects in industrial development, thereby exerting land use to the maximum extent and improving the output of white ginger to realize agricultural synergism and increase of income of farmers.

The invention discloses a land leveling system for a paddy field rotary cultivator. The land leveling system comprises a left-side pull rod, a middle pull rod, a right-side pull rod, a land leveling unit, a driving unit, a hydraulic operation mechanism and a controller, wherein the hydraulic operation mechanism is used for manipulating the land leveling unit; the controller is used for controlling the hydraulic operation mechanism. The land leveling system for the paddy field rotary cultivator has the advantages that a land leveling device with an automatic leveling function is additionally arranged on a rotary cultivator according to agronomic requirements of rice cultivation, so that a land leveling plate is positioned in a horizontal plane all the time in the cultivating and land-leveling processes, therefore the influence to the land leveling device from a tractor due to different mud foot depths and own vibration during a proceeding process is reduced, and the land leveling precision is further improved. The land leveling system for the paddy field rotary cultivator can be used with the existing paddy field rotary cultivator for performing rotary cultivation and soil preparation on paddy fields in a matching manner, so that the land leveling effect of the paddy field rotary cultivator is improved; meanwhile in comparison with a paddy field laser land leveler, the land leveling system for the paddy field rotary cultivator has the advantages of low cost and convenience in popularization and application.

The invention relates to integrated equipment for leveling and burrowing, in particular to agricultural integrated equipment for land leveling and burrowing. According to the equipment, the technical problem to be solved is to provide agricultural integrated equipment for land leveling and burrowing which is fast in working, simultaneously workable in leveling and burrowing, high in working efficiency and good in using effect. In order to solve the above technical problem, the agricultural integrated equipment for land leveling and burrowing is provided. The equipment comprises a cart board, wheels, a first holing head, a first lifting rod, a land leveling frame, a second lifting rod, a soil turning roller, a first belt pulley, a first rotary shaft, a first bearing base and the like. The wheels and the first bearing base are arranged on the lower side of a cart in sequence from left to right, wherein the first rotary shaft is arranged in the first bearing base. According to the agricultural integrated equipment for land leveling and burrowing, the effects of fast working, simultaneous leveling and burrowing, high working efficiency and good using effect are achieved, and a large area of land leveling and burrowing can be completed rapidly by using the equipment.

The invention provides an in-situ bioremediation method for soils polluted by nitrocompounds. The method mainly carries out in-situ remediation treatment of nitrocompounds in polluted soil through combined action of nitrocompound dominant degradation bacteria and plants with strong tolerance. The method comprises the following steps: land leveling, organic matter implantation, culture and adding of microorganisms, improvement of farming layer soil and cultivation and conservation of plants. Pollutants in soil can be degraded rapidly, leaching toxicity of soil can be lowered greatly, the soil remediation cycle is shortened, the remediation cost is low, secondary pollution cannot be generated, the method is simple and practicable, fertility of pollution place soil can be raised, and the method is suitable for in-situ remediation of pollution places with various scales. The method can be suitable for in-situ bioremediation of soils polluted by TNT waste water, DNT waste water, MNT waste water, nitrobenzene waste water, phenyl amine waste water.

The invention discloses a variable-amplitude foldable land leveler for a dry land. The variable-amplitude foldable land leveler for the dry land comprises a traction frame, a machine frame, a land leveling shovel and a walking mechanism. The traction frame is connected with the machine frame. The land leveling shovel and the walking mechanism are arranged on the machine frame. The land leveling shovel comprises a main shovel blade, two auxiliary shovel blades and two variable-amplitude shovel blades. Each end of the main shovel blade is sequentially connected with one auxiliary shovel blade and one variable-amplitude shovel blade. The main shovel blade is hinged to the auxiliary shovel blades. A folding power mechanism is arranged between each auxiliary shovel blade and the corresponding variable-amplitude shovel blade and pushes the auxiliary shovel blade to conduct folding movement towards the front of a shoveling surface. Each folding power mechanism is located on the back side of the shoveling surface. Each folding power mechanism comprises a telescopic cylinder, wherein a cylinder block of the telescopic cylinder is hinged to the main shovel blade, and a telescopic rod of the telescopic cylinder is hinged to the corresponding auxiliary shovel blade. Each auxiliary shovel blade and the corresponding variable-amplitude shovel blade are connected through a detachable structure. The amplitude of the land leveling shovel of the land leveler can be adjusted, and therefore transportation is convenient.

The invention discloses a leveling control system of a land leveller scraper. The system comprises a hydraulic system, and also comprises a detection sensor, a microcontroller and a proportional flow valve driving circuit which are connected in sequence, wherein the detection sensor detects the real-time horizontal tilt angel theta of the scraper; the microcontroller computes angular speed omega according to the horizontal tilt angel theta of the scraper through an I-PD control algorithm, which is taken as a reference value and is transmitted into a nonlinear limit curve; if the value omega exceeds the working range of the nonlinear limit curve, the practical output control angular speed omegaref is equal to omegaMAX, wherein omegaMAX is the maximum angular speed provided by the hydraulic system; otherwise omegaref is equal to omega; omegaref is taken as a PWM duty cycle value, obtained control voltage U0 is sent to the proportional flow valve driving circuit comprising a PWM switching voltage controlled constant flow source circuit, and a proportional flow valve is driven, so that the hydraulic system levels the scraper. The system and the method can effectively eliminate the phenomenon of overshoot of the scraper, improve the response speed and the control accuracy of the scraper, reduce system power loss and mechanical wear, and improve the land leveling efficiency.

The invention discloses a method of optimizing and returning to field of straw of a cold region rice field, and relates to the field of returning to fields of straw of the rice fields. The method aims to solve the technical problems that according to a traditional method of returning to a field of straw, the effect of returning to the field is poor, during a process of returning to the field of the straw, the labor input of a farmer is increased, and the rice transplanting quality is affected. The method comprises the steps of (1) harvesting, wherein the straw is evenly dispersed in the field during harvesting; (2) land preparation and stubble burying, (3) irrigation for field steeping, stubble burying and land leveling and (4) rice transplanting and fertilizer application. Through the method, not only can returning to the field of the straw be achieved in the cold region rice field to achieve a purpose of land fertility betterment, but also negative environment effects caused by mass burning of the straw are alleviated, and fertilizer saving, the high yield, the high quality, the high efficiency and the ecological safety of the rice field are achieved; the method is used for returning to the field of the straw in a cold region.

The invention provides a land leveling method based on GNSS (Global Navigation Satellite System). The method comprises the following steps: determining the general trend of a planned path through analyzing the terrain of the global planning of a target land parcel according to acquired terrain information and a terrain environment model of the target land parcel; then, carrying out local adjustment for avoiding the empty load and full load of ground leveling equipment through the calculation of excavation and filling earth volume based on the terrain environment model and the terrain information, namely, determining the target planned path of the traversing target parcel through the combination of the setting rule based on the calculation of the excavation and filling earth volume and thejudgment of empty / full load; and finally, guiding the ground leveling equipment to carry out target land parcel leveling operation according to the planned path. According to the method provided by the invention, through reasonable ground leveling path planning, the empty load, full load, repeated leveling and omissive leveling of the ground leveling equipment can be effectively avoided or reduced, the land leveling can be effectively guided, and thus the land leveling efficiency is improved.

The invention relates to a vertical milling type land leveler which comprises a frame-shaped stand (1), a left front wheel (2), a right front wheel (3), a rear wheel (4) and a drive steering device, wherein the left front wheel (2), the right front wheel (3) and the rear wheel (4) are arranged on the stand (1); the stand (1) is also provided with a land leveling device and a leveling control device; the vertical milling type land leveler is characterized by further comprising a soil throwing device arranged on the stand (1); the soil throwing device is arranged behind the land leveling device; a soil inlet (5) at the lower end of the soil throwing device and the lower end of the land leveling device are arranged in an opposite way; and a soil outlet (6) of the soil throwing device is arranged above one side of the stand (1) and is arranged outward. The vertical milling type land leveler has the beneficial effects that the soil throwing device and the leveling control device are added onto the land leveler, so that land leveling operation and soil throwing operation are automatically carried out on the occasion with a narrow operating surface, the labor force is saved, and the working efficiency is improved; and furthermore, the vertical milling type land leveler is simple in structure and greatly improves the land leveling accuracy.

The invention belongs to the field of agriculture and relates to a high-yield peanut planting method, in particular to a peanut planting method which is scientific and reasonable and realizes high yield. The peanut planting method comprises steps as follows: (1), application of a base fertilizer; (2), land leveling: requirements for the land leveling are higher than those for an open peanut field, and bedding leveling is required; (3), selection of good seeds: peanut pods are selected firstly before sowing; (4), seed drying before sowing: the seeds are dried before sowing, and germs on skin of the pods can be killed; (5), spraying of a herbicide: 150 g of 72% dual emulsion or 48% Lasso emulsion is used for each mu of land and blended with 50 kg of water after sowing and soil covering, and the mixture is uniformly sprayed to beddings; (6), covering of micro films: after spraying of the herbicide, the land is immediately covered with the films; (7), breaking of the films for releasing of the seedlings: the seedlings of the peanuts can emerge successively in 10-15 days after sowing, cross-shaped small holes are formed in the positions, corresponding to the seedlings, of the mulching films with fingers or blades, and the seedlings are guided out of the films; (8), exposure and hardening of seedlings: peanut leaves are exposed after full stand of the peanuts.

The invention belongs to the technical fields of desertification control and desertification agricultural development and creates technical principle and method for desertification control. Accordingto the method, on the premise of making regional planning and land leveling, measures of applying an I type improver with adsorbing, water-retaining, fertilizer-retaining and impermeable functions toa groove which is excavated according to a square grid, backfilling the groove to be flat as well as applying an II type improver to the surface layer of the desert, performing rotary tillage and thenleveling are taken well; the formulas of the improvers are prepared through scientific combination of various industrial and agriculture organic waste, an excellent organic carbon fertilizer and an agricultural composite microbial agent according to the circular economy development concept and the principle of reducing treatment cost as much as possible; moreover, the wind-proof and sand-fixing measures are taken well by building greenhouses in a staggered way and planting green barriers; and a water source and efficient water-saving irrigation scheme is formulated by combining the specific condition of water resources, high-quality agricultural scientific and technical resources at home and abroad are integrally utilized, and the economic and social benefits of changing the desert into the fertile land are greatly increased.

The invention relates to the technical field of crop cultivation, in particular to a peanut high-yield cultivation method. The method includes the following steps that firstly, after crops are harvested in autumn in first year, deep scarification is conducted on a planting land once, the thickness of the soil loosening layer of the planting land ranges from 45 cm to 50 cm after deep scarification, and natural airing is conducted after the planting land is loosened deeply. According to the peanut high-yield cultivation method, the land leveling procedure is simplified, the soil structure is not destroyed, work is convenient and fast to conduct, the soil loosening degree is increased, and a hardening layer is broken through effectively. Compared with peanut plastic film mulching and cultivation in the prior art, the soil loosening depth is deepened by 15 cm to 20 cm, the soil loosening degree is increased greatly, the water-retaining property of soil is improved, the soil condition of the region where soil is easy to harden is improved greatly, growth of peanuts is promoted, the yield per mu of peanuts is increased, water resources are saved, the production cost is lowered, and the income of peasant households is increased greatly.

The invention discloses a laser receiver for a laser land leveling machine. An angle sensor is arranged in a laser receiver body, is connected to the laser receiver body and sends detected scraper pitch angle and roll angle data to the laser receiver. By adopting the technical scheme, the laser land leveling machine has the function of correcting and compensating the work surface levelness automatically, and the work surface of the laser land leveling machine is retained horizontally in different operating states constantly.

A method for leaching saline-alkali soil comprises following steps: 1) land leveling, deep ditches which are 26 to 60 cm deep are dug with intervals of 0.4 to 8 meters; the deep ditches are one-way parallel ditches, or parallel ditches which are crossed in length and breadth with different density vertically and horizontally, a layer of sand which is 3 to 37 cm thick is laid at the bottom of the deep ditches to form underground alkali discharge sand ditches; 2) underground salt discharge pipes laying; 3) underground irrigation pipes laying; 4) deep scarification and knot breaking; 5) fresh water flooding irrigation; 6) salt water enhanced drainage: while fresh water flooding irrigation is being carried out, one ends of the underground salt discharge pipes are sealed with sealing plugs and the other ends are connected with water pumps to perform enhanced drainage on salt water leached to the underground salt discharge pipes; the leached salt water is drained to salt discharge ditches; 7) continuous irrigation and drainage: the fresh water flooding irrigation and the salt water enhanced drainage are repeated carrying out to quickly leach the salinity in the soil; when the salinity in the soil decreases to an expected target, irrigation and drainage are stopped.

The invention discloses a method for designing a farmland leveling arbitrary slope reference plane. The method mainly comprises the following steps: A, selecting a reference point, and designing an initial reference slope surface; B, measuring the farmland terrain to acquire practical farmland terrain data; C, calculating correction parameters to obtain a final reference slope plane design equation. According to the method, GNSS (Global Navigation Satellite System) differential positioning is utilized to acquire farmland terrain three-dimensional data, the reference plane with any three-dimensional slope direction and slope can be rapidly and conveniently designed according to three reference points, not only can a slopeless plane design can be achieved, but also a single longitudinal slope design can be achieved, and moreover any slope surface design in the two-dimensional direction can be achieved. The requirements on ground fine irrigation water flow direction can be flexibly met.