CN102771346A - Carbon crystal electric geothermal system and application thereof in fruit and vegetable production of facilities - Google Patents
Carbon crystal electric geothermal system and application thereof in fruit and vegetable production of facilities Download PDFInfo
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- CN102771346A CN102771346A CN2012102731943A CN201210273194A CN102771346A CN 102771346 A CN102771346 A CN 102771346A CN 2012102731943 A CN2012102731943 A CN 2012102731943A CN 201210273194 A CN201210273194 A CN 201210273194A CN 102771346 A CN102771346 A CN 102771346A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/14—Measures for saving energy, e.g. in green houses
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Abstract
The invention discloses a carbon crystal electric geothermal system and an application thereof in fruit and vegetable production of facilities. The carbon crystal electric geothermal system comprises at least one carbon crystal electric hot plate, wherein an electric conduction sheet metal is embedded in each carbon crystal electric hot plate, and is connected with two wires. The carbon crystal electric geothermal system further comprises a geotemperature sensor, wherein the geotemperature sensor is connected with a temperature controller, and the temperature controller is connected with two wires. The carbon crystal electric geothermal system provided by the invention can be applied to the fruit and vegetable production of facilities in a full-burying mode, the geotemperature can be increased, the fruit and vegetable yield of the facilities are increased, and the product quality is improved; and the carbon crystal electric geothermal system is used as a novel auxiliary heating facility for the fruit and vegetable production of the facilities, has the advantages of high efficiency, energy conservation, simplicity, environmental friendliness and the like, can effectively relieve the adverse effects of cold-air outbreak and other severe weathers on fruit and vegetable growing in the facilities, and has important popularization and application values.
Description
Technical field
The present invention relates to brilliant electric geothermal system of a kind of carbon and the application in facilities vegetable is produced thereof, belong to the agricultural engineering technology field.
Background technology
Temperature is the important ecological factor that directly influences growth and development of plants, and the rational temperature management is the important measures that guarantee the facilities vegetable yield and quality.Ground temperature, especially root zone temperature influence root growth, moisture and the nutrient absorbing of plant, the existence of edaphon etc., and then influence the plant shoot growth.There are some researches show that ground temperature can influence the synthetic of tomato and cucumber overground part endogenous hormones; Transhipment and distribution (Ren Zhiyu; Lu Xingxia, Li Jing etc. the root zone temperature phase cucumber and the influence [J] of tomato Endogenous Hormone Contents in Vitro that bears fruit to blooming. North China agronomy newspaper, 2007 (2): p.64-66.); In 12 ℃～35 ℃ scopes; The every reduction of root zone temperature just can cause that the corn growth amount reduces about 20% (Walker for 1 ℃; J.M.One-degree increments in soil temperatures affect maize seedling behavior [J] .Soil Science Society of America Journal, 1969.33 (5): p.729-736.).
North China is annual cold wave to take place 2 ~ 6 times, so the greenhouse by solar heat facility of not heating carries out vegetables and survives the winter to produce and have great risk.According to meteorological data; The dark ground temperature of 10cm is 10 ℃～13 ℃ in the greenhouse by solar heat in January of Beijing, and cloudy snow weather condition descends to be lower than 10 ℃, is lower than 15 ℃～18 ℃ (China Academy of Agriculture Mechanization environmental project equipment research development centres of suitable ground temperature of tomato growth; The greenhouse heating system design specification; JB/T 10297-2001.2001, industry standard-machinery .), seriously restricting the yield and quality of facilities vegetable.Research shows; The plant roots district heats and can make the required greenhouse of plant growing hang down 5 ℃～15 ℃ old Yi than the tradition condition of heating. and the heating of plant roots district reduces greenhouse energy resource consumption [J]. agricultural engineering technology (greenhouse production); 2008 (3): p.20.); Energy efficient 28% (Qu Mei etc. heating system greenhouse, ground thermal environment is measured and economic analysis [J]. EI, 2003 (1): p.180-183.).It is necessary carrying out when therefore, day-light greenhouse overwintering is produced that suitable soil heats.The facility of heating that adopts in producing at present mainly contains coal-burning boiler-hot channel, hot-blast stove etc., and with the upper type application period early, technical comparative maturity is that important function has been brought into play in the development of facilities vegetable industry.The facility early investment is bigger but tradition is heated, and involves great expense like hot-blast stove, coal-burning boiler, steel pipe and heat dissipation equipment etc.; It is main that equipment is heated with air, and night, front roof heat dissipation capacity in greenhouse accounted for total heat dissipation capacity 50%～60%, so efficient is lower, height and contaminated environment consume energy; Complicated operation needs the special administrative staff of outfit, and temperature is wayward, and automaticity is lower.Therefore need a kind of efficient, energy-conservation, easy new technology to address the above problem in producing.
Just applying the planar electric heating material carbon crystal electrothermo of a kind of new type low temperature plate at civil heating and field of engineering technology at present, full name carbon fiber lamination composite conducting heating board, its have thermal efficiency height, corrosion-resistant, be convenient to advantages such as automation control.
Summary of the invention
The purpose of this invention is to provide brilliant electric geothermal system of a kind of carbon and the application in the facility fruit and vegetable are produced thereof; The present invention introduces the carbon crystal electrothermo plate in the cultivation of facility fruit and vegetable; Through studying its influence to greenhouse temperature, ground temperature, tomato growth, physiological property and output; And carried out economy with traditional coal-burning boiler and compared, the application technology of the brilliant electric geothermal system of this carbon in the facilities vegetable of surviving the winter is produced is provided.
The brilliant electric geothermal system of a kind of carbon provided by the present invention comprises at least 1 carbon crystal electrothermo plate; The inside of said carbon crystal electrothermo plate is embedded with conductive metal sheet, and said conductive metal sheet is connected with 2 leads;
The brilliant electric geothermal system of said carbon also comprises a ground temperature sensor, and said ground temperature sensor is connected with a temperature controller, and said temperature controller is connected with said 2 leads.
In the brilliant electric geothermal system of above-mentioned carbon, said carbon crystal electrothermo plate specifically can be cuboid, and its length can be 0.5m ~ 3.0m, and width can be 10cm ~ 30cm, and thickness can be 0.5mm ~ 3.0mm.
In the brilliant electric geothermal system of above-mentioned carbon, the single face heat generation density of said carbon crystal electrothermo plate can be 10W/m
2~ 100W/m
2, it is two-sided heat radiation.
In the brilliant electric geothermal system of above-mentioned carbon, said conductive metal sheet specifically can be aluminium foil or Copper Foil etc.
The present invention also further provides the application of the brilliant electric geothermal system of above-mentioned carbon in the facility fruit and vegetable are produced.
In the above-mentioned application, said facility fruit and vegetable specifically can be tomato, cucumber, capsicum, custard squash, eggplant, watermelon and muskmelon etc.
In the above-mentioned application, the brilliant electric geothermal system of said carbon is buried in the cultivation matrix or soil of said facility fruit and vegetable entirely.
In the above-mentioned application, the brilliant electric geothermal system of said carbon is buried in the degree of depth place of 1cm ~ 20cm under cultivation matrix or the soil surface of said facility fruit and vegetable.
The brilliant electric geothermal system of carbon provided by the invention can be applied to through the mode of burying entirely can improve ground temperature in the production of facility fruit and vegetable, increases facility fruit and vegetable output, improves product quality; The brilliant electric geothermal system of carbon is as a kind of novel auxiliary facility of heating of facility fruit and vegetable production; Have advantages such as efficient, energy-conservation, simple and easy, environmental protection; Can effectively alleviate the bad weather adverse effects that growth causes to facilities vegetable such as cold wave, have important generalization and application value.
Description of drawings
Fig. 1 is the structural representation of the brilliant electric geothermal system of carbon provided by the invention, and each mark is following among the figure: 1 carbon trichite thermal element, 2 conductiving metal strips, 3 leads, 4 ground temperature sensors, 5 temperature controllers.
Fig. 2 is the sketch map of the different heating modes of the brilliant electric geothermal system of carbon among the embodiment 2.
Fig. 3 be among the embodiment 2 January different heating modes greenhouse temperature, the diurnal variation situation of ground temperature.
Embodiment
Employed experimental technique is conventional method like no specified otherwise among the following embodiment.
Used material, reagent etc. like no specified otherwise, all can obtain from commercial sources among the following embodiment.
Embodiment 1, the brilliant electric geothermal system of carbon
As shown in Figure 1, the brilliant electric geothermal system of carbon provided by the invention comprises 2 carbon crystal electrothermo plates 1, and this carbon crystal electrothermo plate 1 is a cuboid, and its length is 2m, and width is 15cm, and thickness is 2mm, and it is two-sided heat radiation, and its single face heat radiation density is 50W/m
2The inside of carbon crystal electrothermo plate 1 is embedded with carbon trichite thermal element 6 and conductiving metal strip 2, and conductiving metal strip 2 is coated on the outer surface of carbon trichite thermal element 6, and conductiving metal strip 2 specifically can be Copper Foil or aluminium foil; The outside of carbon trichite thermal element 6 and conductiving metal strip 2 coats the epoxy resin that height is heat-resisting, corrosion-resistant and insulate; Conductiving metal strip 2 is connected with power supply through lead 3; The brilliant electric geothermal system of this carbon also comprises a ground temperature sensor 4, and this ground temperature sensor 4 is connected through lead 3 with a temperature controller 5.
In the brilliant electric geothermal system of carbon provided by the invention, a plurality of carbon crystal electrothermo plates can be set according to actual needs; The conductive metal sheet that is embedded in the carbon crystal electrothermo intralamellar part can be selected metals such as aluminium foil; As required, the length of carbon crystal electrothermo plate can be adjusted in the scope of 0.5m ~ 3.0m, and width can be adjusted in the scope of 10cm ~ 30cm, and thickness can be adjusted in the scope of 0.5mm ~ 3.0mm.
The application of embodiment 2, the brilliant electric geothermal system of carbon
Utilize the brilliant electric geothermal system of carbon provided by the invention to make an experiment, test is carried out at Vegetable & Flower Inst., Chinese Academy of Agriculture Science's greenhouse by solar heat.
1, materials and methods
1.1 material and processing
Tomato variety is " UEFA Champions League ", on August 26th, 2011 seeding and seedling raising, 24 days four September in 2011, leaf was pressed the duplicate rows field planting wholeheartedly the time, large and small line-spacing is respectively 120cm and 30cm, spacing in the rows 30cm, planting density are 3000 strains/667m
2Adopt the slot type organic mass cultivation, cultivating groove vertical section such as Fig. 2, flute length 5.5m.Organic substrate be cow dung, chicken manure and vinegar poor (available from the Tianjin Xiqing District) after stack retting becomes thoroughly decomposed voluntarily by volume proportioning 3:1:2 mixing form every groove filling matrix 400L.Tomato is pinched after staying 3 fringes fruit, and every fringe really stays 4 fruits, and other are by the normal method management.
Four processing (like Fig. 2) are established in test, are respectively:
Handle 1: the carbon crystal electrothermo plate be buried in entirely in the cultivation matrix (whole buried, BW);
Handle 2: the carbon crystal electrothermo plate partly be buried in the cultivation matrix (half buried, BH);
Handle 3: the carbon crystal electrothermo plate lie against stromal surface (no buried, BN);
Handle 4: the greenhouse by solar heat normal cultured, (CK) do not heat.
3 repetitions are established in every processing, and district's group is arranged at random.
With temperature controller (the Wal Fes, DN2008F) measure and control tomato root owner to want the temperature of areal center be 17 ℃.The temperature-controlled precision of temperature controller is ± 1 ℃, and promptly temperature is lower than 16 ℃ and begins to heat, and reaches 18 ℃ of outages automatically.
1.2 mensuration project and method
(1) mensuration of tomato growth and physical signs:
1. plant height: the tape measure stromal surface that in tamato fruit with the precision is 1mm picking time is designated as plant height apart from the length at the top vane axil place of tomato.
2. stem is thick: tamato fruit picking time, centre positions, several from the bottom up the 6th joint position are that the vernier caliper measurement tomato stem of 0.01mm is thick with the precision.
3. the number of blade: writing down the quantity of being born in the true leaf on the trunk after tomato is pinched.
4. chlorophyll content: measure the chlorophyll content of the 6th leaf from the bottom up with SPAD chlorophyll appearance (KONICA MINNOLTA 502, Japan) in fruit expanding period.
5. photosynthetic rate: in fruit expanding period choosing fine morning with the photosynthetic appearance of Li-6400 XT (U.S. LI-COR company) the mensuration photosynthetic rate of the 6th leaf from the bottom up.
6. root system vigor: measure the root system vigor with the TTC method in fruit expanding period.
Each handles the mensuration that above-mentioned each index is carried out in picked at random 9 strains.
(2) mensuration of temperature: measure with environment measuring appearance (the large LDL of Beijing flag Co., Ltd) during the tomato cultivation and record ground temperature, temperature, accuracy is 0.1 ℃, and every 1h record once.Search and write down minimum ground temperature and drop to 16 ℃ time, be i.e. the brilliant electric geothermal system of carbon time of starting working, calculate the ground temperature accumulated temperature of tomato cultivation phase in conjunction with per day ground temperature.
(3) power consumption situation and economic evaluation:, calculate the mutually isocaloric boiler consumption of release coal index with civil buildings coal consumption computational methods with the power consumption of each processing of normal domestic use voltameter record:
Q
c=Q
h×T×Z/(q
c×η
1×η
2)
Q
c-heating coal consumption index, kg/m
2Q
h-heat consumption of building index, W/m
2T-heating phase boiler average operating time; The Z-days of heating period promptly calculates by the 87 days cultivation phases of heating; η
1-outdoor pipe network transfer efficiency, η
1=90%; η
2-boiler operating efficiency, η
2=60%; q
c-coal burning value, q
c=2 * 10
4KJ/kg.In conjunction with early investment, electricity price, coal price etc., compare the economy of the brilliant electric geothermal system of carbon and traditional coal-burning boiler.
1.3 data
Adopt Microsoft Excel 2003 software data processings and mapping, use software DPS 7.05 editions that data are carried out one-way analysis of variance, and utilization Duncan method of inspection is tested to its significance of difference.
2, result and analysis
2.1 the variation and the difference of ground temperature, temperature and ground temperature accumulated temperature
Tomato was gathered from the field planting to February and finishes totally 139 days whole cultivation phase on the 9th.The environmental data monitoring finds that began minimum ground temperature November 15 and reduce to 16 ℃, the cultivation phase of promptly heating is 15-February 9 November, totally 87 days.
January, the diurnal variation situation of greenhouse temperature, ground temperature of different disposal was as shown in Figure 3; Temperature no significant difference between different disposal; Be convenient mapping, the temperature of all processing of temperature acute pyogenic infection of finger tip.
Can know by Fig. 3, January, the ground temperature that the brilliant electric geothermal system of carbon is buried mode entirely compare all the time according to high 3 ℃～5 ℃, shown that it has the ability of heating significantly.And the ground temperature comparison of partly burying, keeping flat mode according to high 0 ℃～2 ℃.
The excursion of the ground temperature that the different heating modes of the brilliant electric geothermal system of carbon are handled and contrasted is all less than temperature; And the high point of temperature all appears at 13:00～14:00; And contrast ground temperature peak appears at 14:00～15:00 in afternoon; Explain that greenhouse effect are still greenhouse soil and obtain one of main mode of heat, and the ground temperature rise has certain hysteresis quality.
Different disposal condition mean ground temperature in following January, temperature and cultivation phase ground temperature accumulated temperature are as shown in table 1.
The tomato mean ground temperature in January that table 1 difference is heated, temperature and cultivation phase ground temperature accumulated temperature
Annotate: different lowercase alphabet differentials different significantly (P < 0.05) after the same column data, down with.
The mean ground temperature in January that processing was buried, partly buries, kept flat to the brilliant electric geothermal system of carbon entirely is 17.9 ℃, 15.1 ℃ and 14.2 ℃, and comparison is shone 13.2 ℃ high 4.7 ℃, 1.9 ℃, 1.0 ℃, ground temperature significant difference between processing respectively.The ground temperature of partly burying, keeping flat processing does not all reach 17 ℃ of setting.Reason possibly be that the cultivation matrix quality is soft, and thermal conductivity factor is low, belongs to the non-conductor of heat, and the brilliant plate liberated heat of carbon is difficult for propagating into underground 10cm depths.
The no significance of mean temperature of air between processing (1.5m place, stromal surface top) is poor, and the brilliant electric geothermal system of carbon is not obvious to the air effect of heating.
The ground temperature accumulated temperature comparison of burying mode entirely is according to high 351 ℃ of skies, and ground temperature accumulated temperature and the contrast difference partly bury, flatwise handled are not remarkable.Because the running time of the brilliant electric geothermal system of the carbon of different heating modes is different, so ground temperature accumulated temperature more can reflect the heating effect of the brilliant electric geothermal system of carbon to matrix.
2.2 the brilliant electric geothermal system of carbon is heated to the influence of tomato growth and physical signs
Different disposal condition thick and number of blade to tomato plant height, stem to influence situation as shown in table 2.
Influence thick to tomato plant height, stem, the number of blade that table 2 difference is heated
The different disposal condition to tomato chlorophyll content, root system vigor and photosynthetic rate to influence situation as shown in table 3.
Table 3 difference is heated to the influence of tomato chlorophyll content, root system vigor and photosynthetic rate
Can know by table 2; The different heating modes of the brilliant electric geothermal system of carbon are handled the influence of tomato plant height not remarkable; Reason possibly be that the time that system begins to heat is November 15; And tomato Sansui on the 18th fruit was beared fruit and was accomplished and pinch November, and it is main that tomato is transferred to reproductive growth by nutrition-reproductive growth.
Can know that by table 3 the brilliant electric geothermal system of carbon is heated and handled the influence of tomato chlorophyll content not obviously, and root system vigor and photosynthetic rate is all had remarkable facilitation.Wherein maximum to bury the mode increase rate entirely, the comparison of root system vigor is according to improving 55.7%, and photosynthetic rate improves 59.8%.Possible cause is that the ground temperature rising has improved tomato root system vigor, has promoted the absorption of root system to nutriment, thereby has promoted the photosynthesis of overground part.
2.3 the brilliant electric geothermal system of carbon is heated to the influence of tomato yield
This experiment is write down the fruit quantity and the output of gathering since the tomato of gathering on January 15 at every turn, and is decided to be early yield with first three time amount of gathering.Different disposal heat to tomato setting number and output to influence situation as shown in table 4; Can know that by table 4 the brilliant electric geothermal system of carbon is the tomato production promoting most pronounced effects handled of the mode of burying entirely: compared with the control, picking fruit quantity improves 22.7%; Early yield increases by 38.7%, and total output increases by 28.2%; Partly bury, keep flat tomato each item yield index of processing and all do not have significant difference with contrast.
Table 4 difference is heated to the influence of tomato setting number and output
2.4 power consumption and economic analysis
The postscript that finishes of gathering February 9 is employed electric weight, the power consumption of unit of account area.With the brilliant electric geothermal system of carbon full the mode of burying be example, every 667m
2At (87 days) the power consumption 7824KWh altogether that heats the cultivation phase, according to 10W/m
2Lay power calculation, the running time of the brilliant electric geothermal system of carbon accounts for 56.2% of the cultivation time of heating.If use coal-burning boiler that identical 7824KWh heat is provided, get Q
c=3.91kg/m
2Input and operating cost that the brilliant electric geothermal system of carbon is buried mode and coal-burning boiler entirely are as shown in table 5.
The brilliant electric geothermal system of table 5 carbon bury entirely heat with coal-burning boiler heat drop into operating cost relatively
Annotate: electricity price is by 0.5 yuan/KWh, and coal price is by 1200 yuan/t.
General points of view thinks that the electricity heating operating cost is high, and cost is difficult to bear.But can know that by table 5 early investment of coal-burning boiler and operating cost are respectively 27 yuan/m
2With 7.30 yuan/m
2, all be higher than 19 yuan/m of the brilliant electric geothermal system of carbon
2With 5.87 yuan/m
2, and simple, the easy operating of the brilliant electric geothermal system equipment of carbon, energy cleanliness without any pollution has better economic and environmental benefit.
Can know that by above-mentioned test the brilliant electric geothermal system of carbon is applied to bury the comparison of heating mode ground temperature entirely according to improving 4.7 ℃ in January in the production in winter of facility fruit and vegetable; Whole cultivation phase ground temperature accumulated temperature improves 351 ℃ of skies; Temperature does not make significant difference, and fruit-setting rate improves 22.7%, and early yield increases by 38.7%; Gross yield increases by 28.2%, and the effect that the ground temperature of only heating also can reach increases tomato yield is described.
Claims (8)
1. the brilliant electric geothermal system of a carbon, it is characterized in that: this system comprises at least 1 carbon crystal electrothermo plate; The inside of said carbon crystal electrothermo plate is embedded with conductive metal sheet, and said sheet metal is connected with 2 leads;
The brilliant electric geothermal system of said carbon also comprises a ground temperature sensor, and said ground temperature sensor is connected with a temperature controller, and said temperature controller is connected with said 2 leads.
2. the brilliant electric geothermal system of carbon according to claim 1, it is characterized in that: said carbon crystal electrothermo plate is a cuboid.
3. the brilliant electric geothermal system of carbon according to claim 2, it is characterized in that: the length of said carbon crystal electrothermo plate is 0.5m ~ 3.0m, and width is 10cm ~ 30cm, and thickness is 0.5mm ~ 3.0mm.
4. according to the brilliant electric geothermal system of arbitrary described carbon among the claim 1-3, it is characterized in that: the single face heat generation density of said carbon crystal electrothermo plate is 10W/m
2~ 100W/m
2
5. the application of the brilliant electric geothermal system of arbitrary said carbon in the facility fruit and vegetable are produced among the claim 1-4.
6. application according to claim 5 is characterized in that: said facility fruit and vegetable are tomato, cucumber, capsicum, custard squash, eggplant, watermelon and muskmelon.
7. according to claim 5 or 6 described application, it is characterized in that: the brilliant electric geothermal system of said carbon is buried in the cultivation matrix or soil of said facility fruit and vegetable entirely.
8. application according to claim 7 is characterized in that: the degree of depth place that the brilliant electric geothermal system of said carbon is buried in 1 ~ 20cm under cultivation matrix or the soil surface of said facility fruit and vegetable.
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| CN103168909A (en) * | 2013-04-17 | 2013-06-26 | 中国农业科学院蔬菜花卉研究所 | Carbon crystal electric-heated bed and application of carbon crystal electric-heated bed in fruit and vegetable seedling culturing of facility |
| CN103968453A (en) * | 2014-05-06 | 2014-08-06 | 北华大学 | Plug-in type electric connector and monitoring device for carbon crystal electric heating composite floors |
| CN107094547A (en) * | 2017-06-13 | 2017-08-29 | 芜湖桑乐金电子科技有限公司 | Carbon crystal electric geothermal system |
| CN108353739A (en) * | 2018-04-03 | 2018-08-03 | 天津市设施农业研究所 | A kind of root zone method for increasing temperature promoting cucumber severe winter season slow seedling and normal growth |
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| CN108353739A (en) * | 2018-04-03 | 2018-08-03 | 天津市设施农业研究所 | A kind of root zone method for increasing temperature promoting cucumber severe winter season slow seedling and normal growth |
| CN108353739B (en) * | 2018-04-03 | 2023-09-12 | 天津市农业科学院 | Root zone warming method for promoting cucumber to grow in deep winter |
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