CN112889613A - Planting method for improving cold resistance of cowpea in seedling stage - Google Patents
Planting method for improving cold resistance of cowpea in seedling stage Download PDFInfo
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- CN112889613A CN112889613A CN202110066762.1A CN202110066762A CN112889613A CN 112889613 A CN112889613 A CN 112889613A CN 202110066762 A CN202110066762 A CN 202110066762A CN 112889613 A CN112889613 A CN 112889613A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/40—Fabaceae, e.g. beans or peas
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C1/00—Apparatus, or methods of use thereof, for testing or treating seed, roots, or the like, prior to sowing or planting
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C1/00—Apparatus, or methods of use thereof, for testing or treating seed, roots, or the like, prior to sowing or planting
- A01C1/08—Immunising seed
Abstract
The invention provides a planting method for improving cold resistance of cowpeas in seedling stage, belonging to the technical field of crop planting, and the method comprises the following steps: soaking cowpea seeds, and then accelerating germination; placing the cowpea seeds after pregermination at 6-9 ℃ for low-temperature dark culture for 18-24 h; sowing the cowpea seeds after low-temperature light-resistant culture; and after the cowpea seeds grow seedlings, performing water and fertilizer management until cowpea harvesting is completed. The method can improve the low-temperature frost resistance of the cowpea, and avoid the yield reduction and economic loss caused by the low-temperature cold damage of cowpea plants, and is simple and efficient to operate and lower in investment cost.
Description
Technical Field
The invention belongs to the technical field of crop planting, and particularly relates to a planting method for improving cold resistance of cowpeas in a seedling stage.
Background
The low-temperature cold injury is a common problem in the early cultivation and production of the cowpeas in autumn and late cultivation and spring in China. After the plants suffer from low-temperature cold damage, flower and pod fall are easily caused, and finally, the yield is reduced and the economic loss is caused. In the global scope, the low temperature seriously threatens the production of crops, influences the high yield and the stable yield and becomes an important problem of wide attention.
The asparagus beans are warm-loving crops, have strong heat resistance but do not resist low temperature and frost, and are easy to be damaged by late frost and late spring cold when the asparagus beans are sowed prematurely in spring. The low-temperature weather has great influence on the growth of the cowpeas, the cowpeas grow slowly below 15 ℃, the growth of the cowpeas is inhibited below 10 ℃, and plants below 5 ℃ are damaged. However, the method for improving the low temperature resistance of cowpea varieties is still lack of research, the variety utilization work is influenced, and a technical method for improving the low temperature resistance of cowpea is necessary to be researched. The traditional method for dealing with low-temperature cold damage of cowpeas at present adopts a spring greenhouse early cultivation mode or adopts comprehensive measures of root cultivation, root protection, nutrition and moisture supplement, pesticide spraying, disease prevention and the like. The existing method has the defects of time and labor consumption, increased input cost and the like.
Disclosure of Invention
In order to solve the technical problems of low temperature resistance and frost resistance of cowpeas, the invention provides a planting method for improving the cold resistance of cowpeas in the seedling stage.
The invention is realized by the following technical scheme:
the embodiment of the invention provides a planting method for improving cold resistance of cowpeas in seedling stage, which comprises the following steps:
soaking cowpea seeds, and then accelerating germination;
placing the cowpea seeds after pregermination at 6-9 ℃ for low-temperature dark culture for 18-24 h;
sowing the cowpea seeds after low-temperature light-resistant culture;
and after the cowpea seeds grow seedlings, performing water and fertilizer management until cowpea harvesting is completed.
Optionally, the cowpea seeds are soaked and then germinated, and the method specifically comprises the following steps:
immersing cowpea seeds in a disinfectant for surface disinfection, after washing, putting the cowpea seeds on wet filter paper, culturing for 24-36h at 25 +/-1 ℃, and completing pregermination when 80% of the cowpea seeds expand and the seed coats are swelled and cracked to be white.
Optionally, the cowpea seeds are immersed in a disinfectant for surface disinfection, and the method specifically includes:
soaking cowpea seed in 70-75% alcohol for surface disinfection for 1-2 min.
Optionally, the culture temperature of the low-temperature light-proof culture is 6 ℃, and the culture time is 24 h.
Optionally, after cultivating the cowpea seed with low temperature and avoiding light sow, specifically include:
deeply ploughing the land to form a plurality of strip-shaped ditches with the depth of 40-50cm, applying decomposed organic fertilizer into the strip-shaped ditches, then covering soil and mixing, and decomposing for 3-5 weeks to form a plurality of ridges;
the width of each ridge is 1.0-1.3m, the distance between each ridge and the adjacent ridge is 30-50cm, two rows of sowing holes are formed in each ridge, the distance between each two rows of sowing holes is 20-40cm, and 2-3 cowpea seeds are sown in each sowing hole.
Optionally, after the cowpea seed seedlings, carry out liquid manure management, gather until accomplishing the cowpea, specifically include:
and after the seedlings of the cowpea seeds emerge for 8-12cm, 2 strong seedlings are reserved in each sowing hole, and then water and fertilizer management is carried out until cowpea harvesting is completed.
Optionally, after, carry out liquid manure management, gather up to accomplishing the cowpea, specifically include:
a strip ditch with the depth of 20-30 cm is arranged in the middle of the two rows of sowing holes of the ridge, and decomposed organic fertilizer is applied in the strip ditch, wherein the dosage of the organic fertilizer is 2000-3000 kg/mu;
5-7 days after seedling emergence, dressing quick-acting fertilizer for 3 times or spraying seedling-extracting fertilizer on leaf surfaces of cowpea plants by combining intertillage;
and after the cowpeas are solid, the cowpeas are harvested for 1-2 times and the quick-acting fertilizer is applied by combining water irrigation.
Optionally, the quick-acting fertilizer comprises urea or compound fertilizer, wherein the dosage of the urea is 10 kg/mu, and the dosage of the compound fertilizer is 10-15 kg/mu.
Optionally, after the cowpea seeds emerge, a plurality of supports with the height of 2-2.5m are built on the ridge, each support is a herringbone frame, and two support legs at the bottom of the herringbone frame correspond to one sowing hole of the ridge.
Optionally, the sowing density of the cowpea seeds is 7000 strains per mu in spring and 10000 strains per mu in autumn.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the planting method for improving the cold resistance of the cowpeas in the seedling stage, the cold resistance of the cowpeas in the seedling stage is improved by performing low-temperature cold acclimation treatment on the cowpeas in the seed bud stage for a period of time, so that the low-temperature frost resistance of cowpea plants is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a planting method for improving cold resistance of cowpea in seedling stage.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
It should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
according to an exemplary embodiment of the present invention, there is provided a planting method for improving cold resistance of cowpea at seedling stage, as shown in fig. 1, the method including:
s1, soaking cowpea seeds, and then accelerating germination.
Specifically, immersing cowpea seeds in a disinfectant for surface disinfection, after washing, putting the cowpea seeds on wet filter paper, culturing for 24-36h at 25 +/-1 ℃, and completing pregermination when 80% of the cowpea seeds swell and crack to expose white seeds.
The germination accelerating temperature of the embodiment of the invention is 25 +/-1 ℃, and the cowpea seeds can germinate faster in the temperature range.
As an optional embodiment, the immersing cowpea seeds in a disinfectant for surface disinfection specifically includes:
soaking cowpea seed in 70-75% alcohol for surface disinfection for 1-2 min.
The cowpea seed disinfection method has the advantages that the alcohol concentration and the disinfection time for disinfecting cowpea seeds are within the range, pathogenic microorganisms on the surfaces of the cowpea seeds can be killed, and dehydration of seed coats and disfavor of sprouting caused by long-time alcohol treatment can be prevented.
S2, placing the cowpea seeds subjected to pregermination at 6-9 ℃ for low-temperature dark culture for 18-24 h.
In a preferred embodiment, the cultivation temperature of the low-temperature dark cultivation is 6 ℃ and the cultivation time is 24 h.
In the embodiment of the invention, the culture temperature and time of the low-temperature dark culture can achieve the effect of low-temperature cold acclimation by adopting the values in the range, and simultaneously the germinated cowpea seeds can not be frosted, so that the cold resistance of the cowpea seedling stage is improved, and if the culture temperature is too low, the germinated cowpea seeds can be frosted, and if the culture temperature is too high, the effect of low-temperature cold acclimation can not be achieved.
And S3, sowing the cowpea seeds after low-temperature light-tight culture.
Specifically, deep ploughing is carried out on the land to form a plurality of strip-shaped ditches with the depth of 40-50cm, thoroughly decomposed organic fertilizer is applied into the strip-shaped ditches, and then, soil is covered and mixed, and the strip-shaped ditches are thoroughly decomposed for 3-5 weeks to form a plurality of ridges;
the width of each ridge is 1.0-1.3m, the distance between each ridge and the adjacent ridge is 30-50cm, two rows of sowing holes are formed in each ridge, the distance between each two rows of sowing holes is 20-40cm, and 2-3 cowpea seeds are sown in each sowing hole.
In the embodiment of the invention, organic fertilizer is buried in deeply ploughed land to be thoroughly decomposed, the soil fertility can be improved, the soil structure is improved, the formed furrow can effectively promote the growth and development of cowpeas after cowpea planting, the depth of the strip-shaped groove is 40-50cm, the development and downward growth of the cowpea root system are facilitated, the plants are promoted to be robust, the root system is too shallow due to too low depth and is not beneficial to nutrient absorption and lodging resistance, the organic fertilizer is thoroughly decomposed for 3-5 weeks, the advantages that soil microorganisms are fully utilized to ferment the organic fertilizer to release nutrients, the heat released by fermentation of the organic fertilizer can cause 'root burning' due to too short decomposition time, the organic fertilizer is not beneficial to arranging farming seeding when too long, and the supply in the market in season is affected.
In the embodiment of the invention, the ridge width, the ridge distance, the hole spacing and the seed quantity of each hole are the values, so that the density and the spacing of cowpea plants can be effectively controlled, the lighting and nutrient supply of each cowpea plant are ensured, the healthy development of the plants is promoted, and the plant diseases and insect pests are reduced.
As an alternative embodiment, the sowing density of the cowpea seeds is 7000-.
The reason that the planting density of the cowpeas is different between spring and autumn is that the growth speed and the whole growth period are different between spring and autumn, and the reasonable close planting method has the advantage that the yield per mu of land can be increased to the maximum extent.
As an optional implementation mode, after the cowpea seeds emerge, a plurality of supports with the height of 2-2.5m are built on the ridge, each support is a herringbone frame, and two support legs at the bottom of each herringbone frame correspond to one sowing hole of the ridge.
According to the embodiment of the invention, the plurality of supports are built on the ridges, and the cowpea plants can climb conveniently due to the cowpea vine plants, so that the sunlight of the leaves of the cowpea plants is favorably collected, the growth and development of the plants are promoted, the yield is increased, and the rust damage is reduced.
And S4, after the cowpea seeds grow seedlings, performing water and fertilizer management until cowpea harvesting is completed.
Specifically, after 8-12cm of cowpea seeds emerge, 2 strong seedlings are reserved in each sowing hole, and then water and fertilizer management is carried out until cowpea harvesting is completed.
In the embodiment of the invention, after 8-12cm of seedlings emerge, planters can effectively judge strong seedlings and weak seedlings, misjudgment is easily caused when the height of the seedlings is too low, nutrient waste caused by the weak seedlings is caused when the height of the seedlings is too high, 2 strong seedlings are reserved in each sowing hole, and lighting and nutrient supply of each plant of cowpea can be fully guaranteed.
As an optional implementation manner, the later performing water and fertilizer management until cowpea harvesting is completed specifically includes:
a strip ditch with the depth of 20-30 cm is arranged in the middle of the two rows of sowing holes of the ridge, and decomposed organic fertilizer is applied in the strip ditch, wherein the dosage of the organic fertilizer is 2000-3000 kg/mu;
5-7 days after seedling emergence, dressing quick-acting fertilizer for 3 times or spraying seedling-extracting fertilizer on leaf surfaces of cowpea plants by combining intertillage;
and after the cowpeas are solid, the cowpeas are harvested for 1-2 times and the quick-acting fertilizer is applied by combining water irrigation.
In the embodiment of the invention, the reason for additionally applying the quick-acting fertilizer or the foliar fertilizer after the emergence of seedlings is that the root nodules of the cowpeas in the seedling stage are not developed, and a certain amount of nitrogen, phosphorus and potassium fertilizer is additionally applied, so that the activity of rhizobia can be promoted, more root nodules are generated, and the yield increase is facilitated.
After 1-2 times of cowpea tender stems are harvested, irrigation is carried out, quick-acting fertilizer is applied, the development and maturation of subsequent cowpea can be promoted, the continuous fructification effect is achieved, and the total yield is improved.
As an optional embodiment, the quick-acting fertilizer comprises urea or compound fertilizer, wherein the dosage of the urea is 10-20 kg/mu, and the dosage of the compound fertilizer is 10-15 kg/mu.
Please supplement: the quick-acting fertilizer adopts urea or compound fertilizer, aims to supplement nitrogen fertilizer for cowpea plants, has the use amount of 10-20 kg/mu and the use amount of 10-15 kg/mu, has the advantages that the flowering and fruiting in the harvesting period consume more nutrition, the top dressing can promote the continuous flowering and pod bearing, the yield is improved, the use amount of the quick-acting fertilizer is too low to achieve the effect of promoting the continuous flowering and fruiting, and the excessive growth of plants and the waste of fertilizer loss can be caused.
According to the method, the cold resistance of the cowpea at the seedling stage is improved by performing low-temperature cold acclimation treatment on the cowpea at the seed germination stage for a period of time, so that the low-temperature frost resistance of cowpea plants is improved.
The planting method for improving the cold resistance of cowpea at seedling stage is described in detail in the following by combining the examples, comparative examples and experimental data.
Example 1
The planting method for improving cold resistance of cowpeas in the seedling stage comprises the following steps:
(1) accelerating germination: selecting disease-free and plump cowpea seeds, immersing the cowpea seeds in 70% alcohol for surface disinfection for 2min, fully washing the cowpea seeds with deionized water, putting the cowpea seeds on wet filter paper, germinating the cowpea seeds in a constant-temperature incubator (25 +/-1 ℃) for 2 days, and completing pregermination when 80% of the cowpea seeds swell and the seed coats are cracked to be white.
(2) Cold domestication at low temperature: and placing the pregerminated cowpea seeds in a dark environment at 6 ℃ for 24 hours.
(3) Land preparation and seeding: deeply ploughing the land to form a plurality of strip-shaped ditches with the depth of 40-50cm, applying decomposed organic fertilizer into the strip-shaped ditches, then covering soil and mixing, and decomposing for 3 weeks to form a plurality of beds;
the width of each ridge is 1.3m, the distance between each ridge and the adjacent ridge is 40cm, two rows of sowing holes are formed in each ridge, the distance between each two rows of sowing holes is 20cm, and 2-3 cowpea seeds are sown in each sowing hole.
The sowing density of the cowpea seeds is 7500 plants/mu in spring and 9000 plants/mu in autumn.
After the cowpea seeds grow seedlings, a plurality of supports with the height of 2.5m are built on the ridge, each support is a herringbone frame, and two support legs at the bottom of each herringbone frame correspond to one sowing hole of the ridge.
(4) And (3) water and fertilizer management: the method is characterized in that the requirement on fertilizer and water is high during the growth and development period of cowpeas, 2 strong seedlings are reserved in each sowing hole after the cowpea seeds emerge for 8-12cm, a ditch with the depth of 30 cm is formed in the middle of two rows of sowing holes of a furrow, decomposed organic fertilizer is applied in the ditch, and the using amount of the organic fertilizer is 2000 kg/mu;
applying quick-acting fertilizer to cowpea plants for 3 times on the 6 th day after seedling emergence by combining intertillage;
and when the cowpeas are fruited, the cowpeas are harvested for 2 times and compound fertilizer is irrigated and topdressed, wherein the using amount of the compound fertilizer is 15 kg/mu.
Example 2
This example differs from example 1 only in step (2): and placing the pregerminated cowpea seeds in a dark environment at the temperature of 9 ℃ for 24 hours.
Comparative example 1
This comparative example differs from example 1 only in step (2): and placing the pregerminated cowpea seeds in a dark environment at 5 ℃ for 24 hours.
Comparative example 2
This comparative example differs from example 1 only in step (2): and placing the pregerminated cowpea seeds in a dark environment at 12 ℃ for 24 hours.
Related experiments:
selecting one mu of test land, uniformly dividing the test land into 4 parts, numbering 1-4, and numbering 1-4, planting cowpeas by adopting the methods of examples 1 and 2 and comparative examples 1 and 2 respectively, wherein the sowing time is 3 months and 14 days in 2014, the daily average air temperature is 14 ℃, and the planting process and result data are as shown in the following table 1:
TABLE 1 test plot 1-4 cowpea planting data
As can be seen from Table 1, after the cowpea plants in the experimental plots 3 and 4 are grown, the survival rate of the plants and the total yield of the cowpea are obviously lower than those in the experimental plots 1 and 2 under the influence of low temperature. Thus, the cowpea plants of comparative examples 1, 2 have significantly lower cold and frost resistance than examples 1, 2.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) according to the planting method for improving the cold resistance of the cowpeas in the seedling stage, the cold resistance of the cowpeas in the seedling stage is improved by performing low-temperature cold acclimation treatment on the cowpeas in the seed bud stage for a period of time, so that the low-temperature frost resistance of cowpea plants is improved.
(2) According to the planting method for improving the cold resistance of the cowpea in the seedling stage, the healthy growth of cowpea plants is further promoted by performing low-temperature cold acclimation treatment on the cowpea in the seed bud stage and combining reasonable close planting, support building and water and fertilizer management, so that the resistance to low temperature and plant diseases and insect pests is improved, and the yield of the cowpea is further increased.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A planting method for improving cold resistance of cowpeas in seedling stage is characterized by comprising the following steps:
soaking cowpea seeds, and then accelerating germination;
placing the cowpea seeds after pregermination at 6-9 ℃ for low-temperature dark culture for 18-24 h;
sowing the cowpea seeds after low-temperature light-resistant culture;
and after the cowpea seeds grow seedlings, performing water and fertilizer management until cowpea harvesting is completed.
2. The planting method for improving the cold resistance of the cowpea in the seedling stage according to the claim 1, wherein the seed soaking and the pregermination of the cowpea seeds specifically comprise the following steps:
immersing cowpea seeds in a disinfectant for surface disinfection, after washing, putting the cowpea seeds on wet filter paper, culturing for 24-36h at 25 +/-1 ℃, and completing pregermination when 80% of the cowpea seeds expand and the seed coats are swelled and cracked to be white.
3. The planting method for improving the cold resistance of the cowpea in the seedling stage is characterized in that the cowpea seeds are immersed in a disinfectant for surface disinfection, and the method specifically comprises the following steps:
soaking cowpea seed in 70-75% alcohol for surface disinfection for 1-2 min.
4. The planting method for improving the cold resistance of cowpeas in the seedling stage according to claim 1, characterized in that the culture temperature of the low-temperature dark culture is 6 ℃ and the culture time is 24 h.
5. The planting method for improving the cold resistance of the cowpea in the seedling stage according to the claim 1, wherein the sowing of the cowpea seeds after the low-temperature dark culture comprises the following specific steps:
deeply ploughing the land to form a plurality of strip-shaped ditches with the depth of 40-50cm, applying decomposed organic fertilizer into the strip-shaped ditches, then covering soil and mixing, and decomposing for 3-5 weeks to form a plurality of ridges;
the width of each ridge is 1.0-1.3m, the distance between each ridge and the adjacent ridge is 30-50cm, two rows of sowing holes are formed in each ridge, the distance between each two rows of sowing holes is 20-40cm, and 2-3 cowpea seeds are sown in each sowing hole.
6. The planting method for improving the cold resistance of the cowpeas in the seedling stage according to claim 5, wherein after the cowpea seeds are sowed, water and fertilizer management is carried out until the cowpea harvesting is completed, and the method specifically comprises the following steps:
and after the seedlings of the cowpea seeds emerge for 8-12cm, 2 strong seedlings are reserved in each sowing hole, and then water and fertilizer management is carried out until cowpea harvesting is completed.
7. The planting method for improving the cold resistance of cowpeas in the seedling stage according to claim 6, wherein the water and fertilizer management is carried out until the cowpeas are harvested, and the method specifically comprises the following steps:
a strip ditch with the depth of 20-30 cm is arranged in the middle of the two rows of sowing holes of the ridge, and decomposed organic fertilizer is applied in the strip ditch, wherein the dosage of the organic fertilizer is 2000-3000 kg/mu;
5-7 days after seedling emergence, dressing quick-acting fertilizer for 3 times or spraying seedling-extracting fertilizer on leaf surfaces of cowpea plants by combining intertillage;
after the cowpea is solid, the cowpea tender stems are irrigated and applied with quick-acting fertilizer after every 1-2 times of harvesting.
8. The planting method for improving the cold resistance of cowpea in seedling stage according to claim 7, wherein the quick-acting fertilizer comprises urea or compound fertilizer, the dosage of the urea is 10-20 kg/mu, and the dosage of the compound fertilizer is 10-15 kg/mu.
9. The planting method for improving the cold resistance of cowpea in the seedling stage is characterized in that after the cowpea seeds sprout, a plurality of supports with the height of 2-2.5m are built on the ridge, each support is a herringbone frame, and two support legs at the bottom of each herringbone frame correspond to one sowing hole of the ridge.
10. The planting method for improving the cold resistance of cowpea in seedling stage as claimed in claim 1, wherein the sowing density of the cowpea seeds is 7000 strains per mu in spring and 10000 strains per mu in autumn.
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