62results about How to "Easy to operate and master" patented technology

The invention relates to a farmland earthworm cultivation and organism farming method established according to the agricultural production, the soil living characteristics of earthworms and the requirement of modern agriculture ecological environment construction, in particular to a method for carrying out earthworm cultivation and organism farming under a non-crop rotation condition of planting and cultivating. Earthworms are cultivated under the environment conforming to the following cultivating conditions of: keeping the water content of farmland soil to be 20-70 percent; constructing inter-ridge irrigation and drainage channels; building a proper quantity of whaleback-shaped soil slopes used for escaping for the earthworms during raining between ridges or in fields; and putting earthworm seeds into the farmland and cultivating. In the invention, the earthworms are introduced to farmland production based on the characteristics of agricultural economic benefit improvement, agricultural environmental pollution reduction, simple and convenient management requirement, and the like, and meanwhile, proved by field tests, the proposed farmland earthworm cultivation and organism farming technology can improve the soil quality, enhance the soil bioactivity and improve the yield and the quality of agricultural products and the agricultural ecological environment.

The invention discloses a farmland ricefield eel cultivating method. Ditching and ridging are carried out on a farmland meeting the requirements of planting taro, corn or paddy, the width of ridging channels are determined by narrow bands and wide bands at intervals, the depth of the ridging channels are determined by shallow ridges and deep ridges at intervals, and the ridging channels are mutually communicated. 1-2 soil slops are built on each ridge every other 25-100 m. Crops are planted on the ridges, ricefield eel seeds are thrown in the channels for cultivating ricefield eels, and angleworms are placed on the ridges for feeding the ricefield eels. In the invention, an innovated mode and technology for planting crops and cultivating ricefield eels is constructed, the problem of low income of the traditional ricefield eel cultivating method and pure crop planting of the farmland is solved, the cultivated land resource of the farmland can be sufficiently utilized, and the ecological environment of the farmland is improved. By adopting the technology, farmers can obtain benefits for many years after investing once.

The Yimaikang dispersion tablet consists of fleabane extractum and medicine carrier. Its recipe includes fleabane extractum, lactose, microcrystalline cellulose, low-substituted hydroxypropyl cellulose, cross-linked polyvidon, steviosin, alcohol, fine silica gel powder and magnesium stearate. The dispersion tablet can disintegrate completely in 3 min to reach homogeneous dispersive state and its effective component andrographolide has dissolving rate reaching 60 % in 10 min. It is used in treating ischemic cerebral vascular diseases, cerebral hemorrhage sequela, vein obstruction, etc. and has fast acting, good taste and convenient taking.

The invention provides a method for raising earthworms in forest according to the features of the ecological environment in forest and the law of earthworm growth in combination with the demands of ecological, economic and social development at present. Earthworms are positioned into the forest and then raised in a scattered way in order to create an appropriate raising environment in the forest.On the basis of the advantages of high economic benefit, simple management requirement, easy operation and mastering of technology, strong operability of in-forest production and good ecological benefit, earthworms are positioned into the forest for production, and simultaneously, the invention also provides a technology for raising earthworms in forest. Field tests prove that the technology can improve the survival rate and the yield factor of earthworms and has a remarkable effect on soil improvement.

The invention relates to a method for replacing an underground pipeline through a cracking and inserting method. A thrust device is arranged in a starting point replacing construction well. A traction device is arranged in an ending point replacing construction well. A traction expansion pipe head of the traction device is extruded into a construction pipe section linearly from a construction pipe section pipeline opening in the starting point replacing construction well to break old pipes in regions where the traction expansion pipe head passes through; the thrust device pushes short pipes arranged behind the expansion pipe head to be in pressure contact with the expansion pipe head and move synchronously; and a plurality of short pipes are pushed in sequence to enter the pipeline and be connected with the short pipes in front of the corresponding plurality of short pipes in an inserting manner till a new pipe formed by mutual inserting and connecting of the short pipes is formed in the pipeline between the two construction wells. The underground pipeline can be efficiently and rapidly replaced on the basis that the ground above the pipeline is not excavated, and construction is safe and reliable.

The invention belongs to the cultivation technology of plant traditional Chinese medicinal materials, and particularly relates to an efficient cultivation method of plateau section traditional Chinese medicinal material aconitum vilmorimianum kom. The cultivation method includes the eight key technological links of seedling selection, cultivation field selection, cultivation field preparation, seeding, soil moisture tidying and heat and moisture preservation, field management, pest control and harvesting and primary processing. Technological means suitable for high cold mountain area large-scale cultivation are adopted for the key links. The efficient cultivation method is easy to operate and master, easy and convenient to use, practical and easy to popularize, wild induction and domestication large-scale cultivation of the aconitum vilmorimianum kom in the high cold mountain area is effectively achieved, the cultivation period is shortened, the yield is improved, and the quality is guaranteed.

The invention discloses a non-destructive detection method for pile bottom karst. In the method, according to the spherical wave reflection principle, a cruciform section is arranged on the surface of a pile bottom rock stratum to detect the reflection information of inner karst with a certain depth; and the development state and the property of the pile bottom karst are judged by a quantitative experience formula via the time-domain and frequency-domain recognition. The method is used for carrying out full-profile scanning on the pile bottom rock stratum, forecasts the distribution situationof the pile bottom karst, comprehensively judges the integrity degree of the pile bottom rock stratum and forecasts the engineering construction in advance. Compared with the commonly-used drilled core method and CT (computed tomography) technology, the non-destructive detection method is more economical, has higher efficiency and avoids the defects that the pile bottom karst can not be completely known with the drilled core method and the CT method is uneconomical to detect the pile bottom karst.

The invention provides a process for preparing purely natural fiber fruit powder by using fresh fruits as the principal raw material and soluble dietary fiber as the auxiliary material, the preparing process comprises the steps of main ingredient and auxiliary material preparation, fiber fruit powder formulation and treatment. The auxiliary material is prepared from fresh konjak, and the prepared fiber fruit powder comprises (by weight ratio) fruit powder 50-80%, soluble dietary fiber 10-40%, dispersing agent 4-8% and flavoring agent 2-4%.

The invention relates to a thermal power unit carbon emission quota adjustment method. On the basis of determining the unit carbon emission amount and the carbon emission intensity based on time series integration, and according to comparison judgment on the carbon emission amount and a predicted unit quota and through a sensitivity analysis means for specific parameters, a production strategy adjustment scheme is given. The fundamental landing point lies in production strategy adjustment and the final purpose is to realize the carbon emission quota to be a non-negative value. The method mainly comprises four steps: 1, calculation parameters for the unit performance carbon emission amount E and the unit carbon emission intensity q are acquired; 2, unit quota A calculation parameters are acquired and calculated; 3, according to the performance carbon emission amount E, the carbon emission intensity q, the quota A and a datum value b, quota surplus-deficit and performance are judged; and4, through acquiring the actual operation parameters of a power generation enterprise and through carrying out key parameter sensitivity analysis on influences on the carbon emission intensity, a production strategy is obtained.

The invention belongs to the field of agriculture, and particularly discloses a local chicken breeding greenhouse with chickens and vegetables therein at the same time and a local chicken breeding method. The local chicken breeding greenhouse comprises a greenhouse body formed by a wall body and a ceiling. A thermal insulation quilt is arranged outside the ceiling. A buffer room is arranged outside the greenhouse body. A local chicken breeding area is arranged on the north part of the inner side of the greenhouse body in the east-west direction. A crop planting area is arranged on the south part of the inner side of the greenhouse body in the east-west direction. According to the local chicken breeding greenhouse and the local chicken breeding method, an efficient and ecological planting and breeding combined development mode is put forward according to the characteristics of greenhouse crop growth and the requirements of local chickens for stocking and through the combination of current ecological, economic and social development requirements; economic benefits are high, management requirements are low, the technology is easy to operate and grasp, ecological benefits are good, tillage resources can be fully used, ecological environment is improved, and the greenhouse has the advantage that benefits are obtained in many years through one-time investment.

The invention discloses an andrographolide dispersed tablet and preparation method, wherein the tablet is prepared from andrographolide and pharmaceutical carrier, the prescription for each 1000 dispersed tablets includes, andrographolide 50-100g, lactose 50-200g, crystalline cellulose 50-250g, low substituted methylcellulose propylene glycol ether 20-150g, crosslinked povidone 20-150g, stevioside 2-20g, right amount of 95% ethanol, silica gel powder 2-20g, magnesium stearate 2-10, the invention has the advantages of good taste, convenient in use, quick action, and can be used for treating diseases including respiratory tract infection and bacteria dysentery.

The invention relates to a special high energy and high effective cow feedstuff, and the prescription of the invention calculated in weight is: rumen pass lipid 55kg, salt 22kg, calcium carbonate 30kg, calcium hydrogen phosphate 25kg, sodium hydrogen carbonate 4kg, vitamin A 0.01kg, vitamin D 30.001kg, Vitamin E 0.1kg, ferrous sulfate 2kg, zinc sulfate 1kg, manganese sulfate 1kg, copper sulfate 0.1kg, cobalt chloride 0.1kg, sodium selenite 0.1kg, and potassium iodide 0.1kg. The components are weighted according different ratio and mixed by a mixing machine for 5-10min, and the coefficient of regularity variation should not be larger than 5%. The technique of the invention is simple and can be easily mastered, that is, the feedstuff can be directly added into cow feedstuff; the packing specification of the invention can be freely adjusted according to different milk production requirement of cow. The invention has the functions of supplementing energy, Vitamin, trace elements, minerals and buffer agent for cow, and has a good application effect that the milk production of cow can be increased by more than 5%.

The invention discloses an efficient green anti-coccidiosis feed for meat chickens and a preparation method and application thereof. The feed consists of corktree bark, baikal skullcap root, golden thread, dock root, licorice root, garden burnet root, betaine, vitamin A, vitamin K3, calcium hydrogen phosphate, potassium iodide and sodium selenite. The method comprises the following steps of: crushing the Chinese medicaments, sieving the powder with a sieve of 60 meshes, weighing the powder in a weight ratio, mixing for 5 to 10 minutes with an efficient mixer, packing with bags, wherein the mixing uniformity requirement of the mixer comprises that the variation coefficient of the uniformity is not more than 5 percent. The production process for the efficient green anti-coccidiosis feed is simple and easily operated and mastered. The feed is convenient to use and remarkable in effect; the coccidiosis incidence rate of the meat chickens can be reduced to less than 10 percent; and the feed can provide the requirements of the meat chickens on vitamins, trace elements and mineral in the growth and development processes at the same time of improving the coccidiosis resistance of the meat chickens, and has popularization and application value.

The invention provides a nimodipine solid dispersing preparation and a preparation method thereof; the nimodipine solid dispersing preparation contains effective dose of nimodipine and pharmaceutic adjuvant which contains polyvinylpyrrolidone K30, sldium lauryl sulfate, hydroxypropyl methylcellulose, etc. After being taken orally, the dispersing preparation can quickly disintegrate and be evenly dispersed into fine particles, so as to have remarkable disintegration and leachability capacity compared with the compressed tablets, realize the rapid absorption of medicine, the function of rapid onset, and improve the bioavailability of human body.

The invention discloses a Boai ginger massecuite. The Boai ginger massecuite is produced from 15-30wt% of Boai ginger, 8-15wt% of jujubes, 5-13wt% of honey, 1-10wt% of wolfberry fruits, and the balance of brown sugar. A production method of the Boai ginger massecuite comprises the following steps: selecting materials, extracting a ginger juice, boiling jujube syrup, carrying out preliminary boiling, carrying out secondary boiling, and carrying out final boiling. Compared with the prior art, the method disclosed in the invention has the advantages of standardized production technology, simple operation, easy knowing, facilitation of experience accumulation and communication and standardized production technology of Boai ginger massecuite product production methods, and facilitation of improvement of the quality, the mouthfeel, the quality stability and the quality reliability of the Boai ginger massecuite product.

The invention discloses a graphene co-deposition chemical composite nickel plating solution. The solution is formed by compounding a graphene dispersion solution and an acid plating solution, the composite plating solution is composed of reagents with relatively low cost, through the mode of compounding the graphene dispersion solution and the acid plating solution, the graphene and the nickel-phosphorus are combined well, a high-quality plating is obtained after plating is carried out, the graphene and the nickel-phosphorus can also be prevented from being plated on the wall of a container,or plating between the graphene and the nickel-phosphorus is mainly prevented; during preparing, the graphene is directly stripped in the liquid phase to form the graphene dispersion solution, and theacid plating solution can be formed by dissolving reagents such as nickel salt, so that the preparation process of the composite plating solution is greatly simplified, and the operation is convenient and fast, and is easy to master; and after the workpiece is plated with the graphene and the nickel-phosphorus plating, the corrosion resistance and the wear resistance can be greatly improved, andthe service life of the workpiece is prolonged.

The embodiment of the invention provides a self-feeding type frozen soil mechanical testing system, and relates to the technical field of frozen soil testing equipment. The self-feeding type frozen soil mechanical test system comprises an outer pressure chamber for providing triaxial pressure, an inner pressure chamber for changing the total volume of a sample, a cold bath system for carrying out a unidirectional freezing test on the sample, an axial force sensor, a displacement sensor, a bending element test system, a temperature control test system, a CT test system and a self-feeding type data acquisition control system, and the self-feeding type data acquisition control system is connected with each test component and is used for acquiring data of each test component and automatically controlling the test process. The system can accurately simulate the natural freezing process of the sample, accurately test the change of the total volume and the microstructure in the shearing process of the sample, realize the dynamic characteristic test of the sample, and provide technical parameters for the design of frozen soil engineering.

An antistaling film (bag) for fresh garlic cloves is prepared from polyvinyl chloride resin, dioctyl phthalate, dioctyl decanedionate, octyl epoxy soybean oleate, phosphite, calcium stearate, zinc stearate, stearic acid, paraffin wax and nano-class active calcium carbonate through proportionally mixing, high-temp kneading, single-screw extruding out and blow moulding.

The invention discloses a device and method for making Henan style egg cooked in an iron pan. The device comprises a first pan cover switch, a second pan cover switch, a first pan cover, a second pan cover, a tubular lamp, an iron pan body, a liquid gas storage tank, a small transformer, a main knife switch, a main power source head, a tubular lamp switch, a socket, a liquid gas cooking range, a leakage protector, a first pan cover work indicating lamp, a second pan cover work indicating lamp, a microcomputer temperature displayer of the first pan cover, a microcomputer temperature displayer of the second pan cover, a workbench, a carrying table, a K1 switch, a K2 switch and a distribution box. The device and method achieve intelligent operation, and are sanitary, short in making time, controllable in temperature, free of environmental pollution, capable of saving time and labor, and easy to operate and grasp.

The invention relates to an ultraviolet (UV) adhesive capable of being stripped by heating and a preparation method thereof. The UV adhesive can be used for bonding an object after being cured by ultraviolet irradiation, and the bonded object can be stripped by heating. The UV adhesive capable of being stripped by heating is composed of a UV adhesive and an ethylene-vinyl acetate copolymer, wherein the UV adhesive contains one or a combination of more selected from epoxy acrylate resin, polyurethane resin, polyacrylate resin, polyether acrylate resin and polyurethane acrylate resin, and the mass percentage of the ethylene-vinyl acetate copolymer to the UV adhesive capable of being stripped by heating is 30-40%, and preferably 35%. The invention further provides the preparation method of the UV adhesive capable of being stripped by heating. The UV adhesive disclosed by the invention can be cured for bonding by ultraviolet irradiation and is easy to operate and master. In addition, the operation of stripping by heating can be carried out at a lower temperature, so that the operation time can be greatly saved, and reworking and repairing efficiency is improved.

The invention discloses an aluminum alloy high-voltage cable aluminum copper composite terminal. The aluminum alloy high-voltage cable aluminum copper composite terminal comprises a copper alloy substrate and connecting grooves formed in the two ends of the copper alloy substrate; the connecting grooves adopt a U-shaped groove-shaped cross section and are symmetrically distributed along the axis of the copper alloy substrate; the length of the connecting grooves is 1 / 5-1 / 2 of that of the copper alloy substrate; the inner surfaces of the connecting grooves are both distribute with aluminium alloy lining layers; and the thickness of the aluminium alloy lining layers is 1 / 4-3 / 4 of that of the connecting groove side wall; and the preparation method comprises four steps of copper alloy substrate prefabrication, connecting groove pre-processing, aluminum lining layer positioning, connecting groove diameter expansion and connecting groove fine processing. By virtue of the aluminum alloy high-voltage cable aluminum copper composite terminal and the preparation method thereof, the connecting structural strength, the impact resistance performance, the corrosion resistance performance and thehigh temperature resistance performance between the terminal and the cable can be improved effectively, so that the mechanical structural strength of the terminal is highly improved; and in addition,the overload capacity of the terminal is improved effectively, and current distribution uniformity is improved, thereby highly improving reliability and operational stability of the power cable connection operation.

The invention relates to a method for solving agricultural non-point source pollution. The method comprises the following steps: a pond surrounding the periphery of a farmland is arranged along the external contour of the farmland; a drainage ditch communicated with the pond is formed in the farmland; aquatic products are cultivated in the pond, and aquatic plants are planted at the bottom of the pond; a pool for intersecting the pond is arranged on the pond; two water passing ports communicated with the pond are formed in the side surface of the pool; meshes and sluices are mounted in the water passing ports; and a cement cover plate with a bearing effect is laid on the top port of the pool. The method, provided by the invention, has the advantages of low investment cost, long service life, good economic benefit and no secondary ecological pollution, and plays an important role in the protection of ecological environment and the prevention of water body eutrophication.

The invention discloses a method for producing nodular cast iron from low-manganese steel scrap accessories. The method comprises the steps as follows: low-manganese steel scrap, recirculated iron andadditives are matched in percentage by weight, and the additives include a nodulizer, 75SiFe and a carburant and are added as per the percentage of the total weight of the low-manganese steel scrap and the recirculated iron; the recirculated iron, the carburant and the low-manganese steel scrap are sequentially added to an electric medium-frequency induction furnace, heating is stopped after thetemperature rises to 1,500-1,530 DEG C, and slag is cleaned through raking; the nodulizer and 75SiFe are sequentially placed into a nodulizing ladle reaction chamber, and the chamber is covered with an upper cover; the molten iron discharging temperature is controlled to be 1,520+ / -10 DEG C, molten iron in the electric furnace is poured into the nodulizing ladle reaction chamber from a liquid inlet in the upper cover, and the nodulizing reaction time is controlled to range from 60 s to 120 s; the pouring temperature is controlled to range from 1,390 DEG C to 1,410 DEG C, and pouring is performed in a manufactured sand mold cavity. The method has the beneficial effects as follows: produced castings have the good density; the method is convenient to operate and master; the production cost can be reduced; the low-manganese steel scrap has the stable source and is convenient to buy, resources can be saved, and the energy consumption can be reduced.

The invention relates to an accurate automatic control method for concentration of metal ions to be deposited in an electrolyte during electronic circuit board electroplating. In the electrodepositionprocess of the circuit board, a soluble anode of the metal to be deposited is placed in an anode bag and hung under an anode conductive rod, a micro-pressure detector is arranged under the anode conductive rod, electrodeposition power supply is switched on, the micro-pressure detector detects a pressure value in real time, and the initial pressure value and the subsequent pressure value are transmitted to a signal control analysis unit, pressure variation within the unit time during (1 / 10-1 / 50)t (t is the expected single-plate electrodeposition time) from beginning of the electrodeposition iscalculated by the signal analysis unit. Through calculation, the pressure variation within the unit time begins to gradually decrease, and the signal analysis unit sends a supplement command to a supplement device. When instantaneous pressure is detected to be equal to initial pressure, the supplement is stopped, so that automatic, accurate and real-time control of the anode metal ion concentration is realized, the quality of circuit board electrodeposition is improved, and the accurate automatic control method is more sensitive and convenient than common solution composition laboratory analysis.

The invention discloses a preparation method of an ATO / SiO2 / waterborne polyacrylate composite microsphere. The preparation method comprises the following steps: dispersing ATO, carrying out surface modification on ATO by virtue of a silane coupling agent so as to obtain ATO / SiO2 composite suspension liquid, removing ethanol from the ATO / SiO2 composite suspension liquid, and adding acrylate polymeric monomers, a polymerizable emulsifying agent, an auxiliary emulsifying agent and dispersing agent for emulsifying, so as to form ATO / SiO2 composite emulsified liquid; and finally enabling the emulsified liquid to react with an initiator, so as to prepare the ATO / SiO2 / waterborne polyacrylate composite microsphere. The ATO / SiO2 / waterborne polyacrylate composite microsphere is taken as a transparent thermal-insulation functional filler and has wide application prospects and huge energy-saving significances in transparency and thermal insulation of glass doors and windows, and the problems that nano-ATO of a transparent thermal-insulation composite emulsion prepared by virtue of simple blending is low in surface activity, difficult to modify, poor in dispersion stability and in phase separation with an organic phase can be fundamentally solved. Furthermore, the process is simple, and the flow is short, so that the preparation method is applicable to industrial production.

The invention belongs to the field of tobacco leaf extraction and processing, and specifically relates to a method of extracting starch from waste tobacco leaves. The method comprises the following steps: (1) preparing a sample with inactivated enzymes; (2) preparing tobacco powder; (3) soaking; (4) filtering; (5) performing centrifugation; (6) removing impurities; (7) filtering for the second time; (8) carrying out centrifugation for the second time and drying by baking. The provided method has the advantages of high starch extraction rate and high starch purity, is capable of prominently improving the utilization value of tobacco leaf, and can be used by the food processing enterprises. The technology of extracting starch from tobacco leaves is refined, becomes more operable, is capable of prominently increasing the output and extraction rate of starch from tobacco leaves, increases the utilization value of waste tobacco leaves, can be easily mastered and operated by workers in starch processing enterprises, increases the incomes of tobacco farmers, and has a good popularization prospect.

The invention relates to a loach cultivation method and in particular relates to a planting-cultivating combined farmland loach low-carbonized cultivation method which is used for cultivating loach in a farmland meeting the demands of planting core, taro or rice. The method comprises the following steps: 1) ditching and ridging the farmland and building 1-2 soil slopes on each ridge at an interval of 30m-80m, wherein the ditch width of the ditches among ridges is characterized by alternated narrow bands and wide bands, the ditch depth of the ditches in ridges is characterized by alternated shallow ditches and deep ditches, and all the ditches in ridges are communicated with edge slots around the farmland, thereby ensuring the unobstructed ditches; 2) cultivating loaches in the ditches among the ridges based on the condition that 2000-50000 loaches are put into per mu of the farmland; 3) planting crops on the soil slopes built in the step 1); and 4) putting earthworms into a ridge platform based on a quantity standard of 100-350kg / mu. The planting-cultivating combined farmland loach low-carbonized cultivation method is used for solving the low-income problems of the traditional methods for cultivating loach and purely planting crops in the farmland and fully utilizing the farmland resource, improving the ecological environment in the farmland, and has the characteristics of realizing the multiple-year benefits from once investment and the like.

The invention discloses a down-the-hole impact cone which comprises a drill rod, an impactor and a sleeve, wherein a punch hammer is positioned in the impactor. The upper portion of the impact cone extends into the impactor to be connected with the impactor through a spline and is locked through a safety pin installed in a vertical strip-shaped hole, so that the impact cone can move up and down within a certain range relative to the impactor. The upper portion of the impact cone is provided with an L-shaped air hole, the middle of the impact cone is provided with a step, and the bottom of the impact cone is provided with a conical head. An impact shoe is located below the impact cone and is in threaded connection with the sleeve, the lower end of the impact shoe is conical and extends out of the sleeve, a channel for the lower portion of the impact cone to pass is arranged in the impact shoe, and the taper angle of the conical head is equal to that of the end of the impact shoe. When the step presses the top of the impact shoe, the conical surface of the conical head is just coplanar with the conical surface of the lower end of the impact shoe. The drilling efficiency is improved, the construction cost is reduced, the drilling scrapping is effectively avoided, and smooth core taking and sampling of a pipe following well section are guaranteed.

The invention relates to a comprehensive technology combining a three-dimensional ecological agricultural development pattern, planting and breeding, in particular to a three-dimensional ecological breeding method for river crabs in a vegetable field. The vegetable field is a comprehensive three-dimensional vegetable field using deep ditching and wide ridging, ditches of the comprehensive three-dimensional vegetable field are filled with water, juvenile crabs are put in for crab breeding, earthworms are placed on ridges, crops are planted in the ridges, and the crops and the crabs grow in the vegetable field together. The three-dimensional ecological breeding method for the river crabs in the vegetable field provides a creative mode and technique combing crop planting and river crab breeding, and resolves the problems that as for a traditional river crab breeding method, the crops are independently planted in the vegetable field, the fodder and chemical fertilizer putting-in amount is large, a system is single to cause source waste, and income is low. According to the three-dimensional ecological breeding method, disposable investment can be achieved, cost is low, management is simple, quality of agricultural products is good, and the rate of return is high.