CN115885786A - Anti-aging and yield-increasing plastic film mulching planting method for spring corn in rain-fed dry land - Google Patents
Anti-aging and yield-increasing plastic film mulching planting method for spring corn in rain-fed dry land Download PDFInfo
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
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Abstract
The invention belongs to the technical field of crop planting, and particularly relates to a method for planting spring corn in rain-fed dry land by mulching for preventing senescence and increasing yield, which comprises the following steps: s1, ploughing soil, excavating a groove in the soil, paving a U-shaped pipeline in the groove, arranging a filter screen at one end of the U-shaped pipeline, installing a branch pipe on the U-shaped pipeline, covering the excavated soil on the U-shaped pipeline, and enabling one end of the filter screen to be located below the soil and the other end of the U-shaped pipeline and one end of the branch pipe to be located above the soil; s2, ridging and sowing the soil above the filter screen, and covering a mulching film on the ridge, so that one end of the branch pipe is positioned inside the mulching film, and the other end of the U-shaped pipeline is positioned outside the mulching film and communicated with the atmosphere; and S3, performing seedling emergence management, soil and fertilizer management and harvesting. According to the invention, the heat dredging system is laid in the mulching film, so that redundant heat generated in the mulching film is discharged out of the mulching film in time, and on the premise of using the mulching film, soil moisture can be kept and the temperature in the mulching film is prevented from rising.
Description
Technical Field
The invention belongs to the technical field of crop planting, and particularly relates to a method for planting spring corn in rain-fed dry land by mulching for preventing senescence and increasing yield.
Background
Rain-fed dry farming is a water-saving planting mode for crops, and aims to produce crops by means of natural rainfall without irrigation, and specifically, the aims can be achieved by adjusting the planting mode, adopting crop varieties with strong drought resistance, implementing drought-resistant crop layout and the like. The production mode of the crops is very important for arid regions, and the production of the crops is greatly limited by water resources due to insufficient water resources in northwest regions, so that the production increase of the rain-fed dry farming crops is a key research point.
For rain-fed dry farming, one of the currently common methods is to cover a mulching film on a planting area during the planting process. Because the photo-thermal resources in northwest regions are quite sufficient, if no mulching film is covered, the water in the soil is easy to evaporate, so that the root system of the crop is in a drought environment; after the planting area is covered with the mulching film, the mulching film can isolate soil and atmosphere to a certain extent to perform water vapor exchange circulation, water in the soil cannot evaporate to the atmosphere to disappear, the durability of the water in the soil environment is improved, and the problems of yield reduction and the like of crops caused by water shortage are favorably solved under the condition of the same rainfall. However, the use of mulching films also presents adverse factors for the growth of crops, in particular: as mentioned above, due to abundant photothermal resources in northwest, after the soil is covered by the mulching film, the heat exchange rate of the space formed between the soil and the mulching film is reduced, so that the temperature in the mulching film is increased, and the growth of crops is influenced by the high temperature. Therefore, how to maintain moisture in the mulching film and prevent high temperature in the mulching film at the same time is a problem to be solved by the invention.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for planting spring corn in rain-fed dry land by plastic film mulching for preventing senescence and increasing yield.
The invention is realized by the following technical scheme.
An anti-aging and yield-increasing mulching film mulching planting method for spring corn in rain-fed dry land comprises the following steps:
s1, reforming a soil structure to be planted:
ploughing soil to be planted, excavating a groove in the soil to be planted, paving a U-shaped pipeline in the groove, arranging a filter screen at one end of the U-shaped pipeline, installing a branch pipe on the U-shaped pipeline, covering the excavated soil to be planted on the U-shaped pipeline, enabling one end of the U-shaped pipeline, which is provided with the filter screen, to be located below the soil, and enabling the other end of the U-shaped pipeline and one end of the branch pipe, which is far away from the U-shaped pipeline, to be located above the soil;
s2, ridging and sowing the soil to be planted above the filter screen in the S1, and covering a mulching film on the ridge, so that one end, away from the U-shaped pipeline, of the branch pipe in the S1 is located inside the mulching film, and the other end of the U-shaped pipeline is located outside the mulching film and communicated with the atmosphere;
and S3, performing seedling emergence management, soil and fertilizer management and harvesting.
Preferably, the pipe orifice of one end of the branch pipe, which is far away from the U-shaped pipeline, is rotatably connected with a wind guide fin.
Preferably, an air inlet is fixedly connected to a pipe orifice of one end, located on the outer side of the mulching film, of the U-shaped pipeline, the air inlet is horizontally arranged, and the inner diameter of one end, far away from the U-shaped pipeline, of the air inlet is larger than that of the U-shaped pipeline.
Preferably, the soil to be planted contains a water-retaining agent and straws, and the length of the straws is 3-5 cm.
Preferably, the mass ratio of the using amount of the straws to the ploughed soil to be planted is 0.3-0.5.
Preferably, the using amount of the water-retaining agent is 2-5% of the mass of the plowed soil to be planted.
Preferably, in S2, wide and narrow rows of 60-70 cm and 35-45 cm are adopted for sowing the corns.
Preferably, in S3, thinning is carried out when the corn seedlings grow to 3-4 leaves, and final singling is carried out when the corn seedlings grow to 5-6 leaves, and nitrogen fertilizers are applied during the corn jointing stage and the horn mouth stage.
Compared with the prior art, the invention has the following beneficial effects:
the invention aims to prevent the temperature in a mulching film from rising to influence the growth of crops while keeping soil moisture on the premise of using the mulching film, and the main inventive concept is to lay a heat dredging system in the mulching film to discharge excessive heat generated in the mulching film to the outside of the mulching film in time, and the specific strategy is as follows: covering a mulching film on the planting area, paving a U-shaped pipeline under soil of the planting area, wherein one end of the pipeline is communicated with the bottom of the planted seedling, the other end of the pipeline is communicated with the outside of the mulching film, and when the temperature in the mulching film rises to influence the growth of the seedling, the heat at the root of the seedling can be released to the outside of the mulching film through the pipeline; the pipeline is also communicated with a branch pipe, the branch pipe is positioned in the mulching film and above the planting soil, and heat in the mulching film can enter the pipeline through the branch pipe and is discharged out of the mulching film; in order to better exchange heat, an air inlet is formed in one end, located outside the mulching film, of the pipeline, when wind exists outside the pipeline, the wind can enter the pipeline through the air inlet and enter the planting soil and the mulching film, the air guide fins are arranged at the pipe openings of the branch pipes and rotate under the action of the entering wind, and therefore the air in the mulching film flows to promote heat dissipation, and the temperature in the mulching film is reduced.
In addition, in order to further ensure that the soil has water supply, the invention also particularly provides the following contents: the pipeline has a heat dissipation function, can enter the mulching film through the pipeline when precipitation exists outside, and has a certain water storage function, so that the water holding capacity of soil is improved; the water retention agent and the straw are added into the planting soil, the straw has a tubular structure and is mixed in the planting soil, the connectivity of the interior of the soil can be improved, a path is provided for the transmission of water and other nutrient components, and the water retention agent can improve the water retention of the soil; the soil can be ensured to have a water retention function by the cooperation of the aspects and the function of the mulching film.
The water retention and heat dissipation strategy of the invention can effectively promote the growth of crops and is suitable for popularization and application.
Drawings
FIG. 1 is a schematic structural view of the present invention for improving the soil structure to be planted;
FIG. 2 is water content test data for examples 1-4 and comparative examples 1-2;
FIG. 3 is temperature test data for examples 1-4 and comparative examples 1-2;
FIG. 4 is the production data for examples 1-4 and comparative examples 1-2;
description of reference numerals:
1. the planting method comprises the following steps of planting soil, 2, a mulching film, 3, a U-shaped pipeline, 31, a filter screen, 32, an air inlet, 33, branch pipes, 34 and wind guide wings.
Detailed Description
In order to make the technical solutions of the present invention better understood and implemented by those skilled in the art, the present invention is further described below with reference to the following specific embodiments and the accompanying drawings, but the embodiments are not meant to limit the present invention. The experimental methods and the detection methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
The main inventive concept of the invention is that the heat dredging system is laid in the mulching film to discharge the redundant heat generated in the mulching film to the outside of the mulching film in time, and the specific strategy is as follows: covering a mulching film on the planting area, paving a U-shaped pipeline under soil of the planting area, wherein one end of the pipeline is communicated with the bottom of the planted corn seedling, the other end of the pipeline is communicated with the outside of the mulching film, and when the temperature in the mulching film rises to influence the growth of the seedling, the heat at the root of the seedling can be released to the outside of the mulching film through the pipeline; the pipeline is also communicated with a branch pipe, the branch pipe is positioned in the mulching film and on the surface of the planting soil, and heat in the mulching film can enter the pipeline through the branch pipe and is discharged out of the mulching film; in order to better exchange heat, an air inlet is formed in one end, located outside the mulching film, of the pipeline, when wind exists outside the pipeline, the wind can enter the pipeline through the air inlet and enter the planting soil and the mulching film, the air guide fins are arranged at the pipe openings of the branch pipes and rotate under the action of the entering wind, and therefore the air in the mulching film flows to promote heat dissipation, and the temperature in the mulching film is reduced.
The above-mentioned matters are specifically explained below by the following examples and comparative examples.
Example 1
An anti-aging and yield-increasing mulching film mulching planting method for spring corn in rain-fed dry land comprises the following steps:
s1, ploughing soil, namely digging a groove in the soil 1 to be planted as shown in figure 1, paving a U-shaped pipeline 3 in the groove, arranging a filter screen 31 at one end of the U-shaped pipeline 3, and extending the other end of the U-shaped pipeline to the ground surface; the U-shaped pipeline 3 is also communicated with one end of a branch pipe 33, and the other end of the branch pipe 33 extends to the surface of the soil 1 to be planted and is positioned in the subsequently covered mulching film 2; a duct port of one end of the branch pipe 33, which is far away from the U-shaped pipeline 3, is provided with a wind guide fin 34, and the wind guide fin 34 is rotatably connected to the inner wall of the branch pipe 33; concretely, there is the connecting rod at branch pipe 33 mouth of pipe department rigid coupling, rotates on the connecting rod to be connected with air guide wing 34, and air guide wing 34 is 3, and similar fan structure when branch pipe 33 has wind, can blow air guide wing 34 and rotate, and then form the air current in plastic film 2, the other end of U-shaped pipeline 3 is located the plastic film 2 outside, and the rigid coupling has air-facing opening 32 on the mouth of pipe, air-facing opening 32 keeps away from the one end internal diameter of U-shaped pipeline 3 is greater than the U-shaped pipeline 3 internal diameter, specifically is 3 times, and the reason that sets up like this makes things convenient for outside wind to get into in U-shaped pipeline 3 more easily to drive air guide wing 34 and rotate.
S2, covering planting soil on the U-shaped pipeline paved in the S1, ridging, and enabling one end provided with the filter screen 31 to be in the ridge; the soil to be planted contains a water-retaining agent and straws, the straws have a tubular structure, and the straws are mixed in the soil to be planted, so that the connectivity inside the soil can be improved, a path is provided for the transmission of water and other nutrient components, and the length of the straws is 3-5 cm; the mass ratio of the using amount of the straws to the plowed soil to be planted is 0.3; the using amount of the water-retaining agent is 5% of the mass of the plowed soil to be planted.
S3, sowing corns on S2 ridges in the last ten days of April, sowing 4 jin in each mu, covering the mulching film 2, enabling the branch pipe 33 to be located in the mulching film 2, and enabling the other end of the U-shaped pipeline 3 to be located outside the mulching film 2 and communicated with the atmosphere; the corn is sowed in wide and narrow rows, the big row is 60 cm, and the small row is 35 cm.
S4, seedling emergence management and soil fertilizer management; thinning the corn seedlings when the corn seedlings grow to 3-4 leaves, wherein the density of the corn seedlings is about 3000 plants per mu generally, and setting the seedlings when the leaves grow to 5-6 leaves; nitrogen fertilizer is topdressed in the corn jointing stage and the horn mouth stage.
And S5, harvesting the corn.
Example 2
An anti-aging and yield-increasing mulching film mulching planting method for spring corn in rain-fed dry land comprises the following steps:
s1, ploughing soil, namely digging a groove in the soil 1 to be planted as shown in figure 1, paving a U-shaped pipeline 3 in the groove, arranging a filter screen 31 at one end of the U-shaped pipeline 3, and extending the other end of the U-shaped pipeline to the ground surface; the U-shaped pipeline 3 is also communicated with one end of a branch pipe 33, and the other end of the branch pipe 33 extends to the surface of the soil 1 to be planted and is positioned in the subsequently covered mulching film 2; a wind guide fin 34 is arranged on a pipe orifice of one end of the branch pipe 33 far away from the U-shaped pipeline 3, and the wind guide fin 34 is rotatably connected to the inner wall of the branch pipe 33; specifically, a connecting rod is fixedly connected to the pipe orifice of the branch pipe 33, the connecting rod is rotatably connected with the wind guide fins 34, the number of the wind guide fins 34 is 2, the wind guide fins are similar to a fan structure, when wind exists in the branch pipe 33, the wind guide fins 34 can be blown to rotate, air flow is further formed in the mulching film, the other end of the U-shaped pipe 3 is located on the outer side of the mulching film 2, the pipe orifice is fixedly connected with a wind inlet 32, the inner diameter of one end, far away from the U-shaped pipe 3, of the wind inlet 32 is larger than the inner diameter of the U-shaped pipe 3, specifically 3 times, and the reason for setting is that external wind can enter the U-shaped pipe 3 more easily and the wind guide fins 34 are driven to rotate.
S2, covering planting soil on the U-shaped pipeline paved in the S1, ridging, and enabling one end provided with the filter screen 31 to be in the ridge; the soil to be planted contains a water-retaining agent and straws, the straws have a tubular structure, and the straws are mixed in the soil to be planted, so that the connectivity inside the soil can be improved, a path is provided for the transmission of water and other nutrient components, and the length of the straws is 3-5 cm; the mass ratio of the using amount of the straws to the plowed soil to be planted is 0.5; the using amount of the water-retaining agent is 2% of the mass of the plowed soil to be planted.
S3, sowing corns on S2 ridges in the last ten days of April, sowing 4 jin in each mu, covering the mulching film 2, enabling the branch pipe 33 to be located in the mulching film 2, and enabling the other end of the U-shaped pipeline 3 to be located outside the mulching film 2 and communicated with the atmosphere; the corn is sown in wide and narrow rows, the large row is 70 cm, and the small row is 45 cm.
S4, seedling emergence management and soil fertilizer management; thinning when the corn seedlings grow to 3-4 leaves, wherein the density of the corn seedlings is about 3000 plants per mu generally, and setting seedlings when the leaves grow to 5-6 leaves; and (4) dressing nitrogen fertilizer in the corn jointing stage and the horn mouth stage.
And S5, harvesting the corn.
Example 3
An anti-aging and yield-increasing mulching film mulching planting method for spring corn in rain-fed dry land comprises the following steps:
s1, ploughing soil, namely digging a groove in the soil 1 to be planted as shown in figure 1, paving a U-shaped pipeline 3 in the groove, arranging a filter screen 31 at one end of the U-shaped pipeline 3, and extending the other end of the U-shaped pipeline to the ground surface; the U-shaped pipeline 3 is also communicated with one end of a branch pipe 33, and the other end of the branch pipe 33 extends to the surface of the soil 1 to be planted and is positioned in the mulching film 2 to be covered subsequently; a duct port of one end of the branch pipe 33, which is far away from the U-shaped pipeline 3, is provided with a wind guide fin 34, and the wind guide fin 34 is rotatably connected to the inner wall of the branch pipe 33; concretely, there is the connecting rod at branch pipe 33 mouth of pipe department rigid coupling, rotates on the connecting rod to be connected with air guide wing 34, and air guide wing 34 is 3, and similar fan structure when branch pipe 33 has wind, can blow air guide wing 34 and rotate, and then form the air current in the plastic film, the other end of U-shaped pipeline 3 is located the plastic film 2 outside, and the rigid coupling has air-facing opening 32 on the mouth of pipe, air-facing opening 32 keeps away from the one end internal diameter of U-shaped pipeline 3 is greater than the U-shaped pipeline 3 internal diameter, specifically is 3 times, and the reason that sets up like this makes things convenient for outside wind to get into in U-shaped pipeline 3 more easily to drive air guide wing 34 and rotate.
S2, covering planting soil on the U-shaped pipeline paved in the S1, ridging, and enabling one end provided with the filter screen 31 to be in the ridge; the soil to be planted contains a water-retaining agent and straws, the straws have a tubular structure, and the straws are mixed in the soil to be planted, so that the connectivity inside the soil can be improved, a path is provided for the transmission of water and other nutrient components, and the length of the straws is 3-5 cm; the mass ratio of the using amount of the straws to the plowed soil to be planted is 0.4; the using amount of the water-retaining agent is 4% of the mass of the plowed soil to be planted.
S3, sowing corns on S2 ridges in the last ten days of April, sowing 4 jin in each mu, covering the mulching film 2, enabling the branch pipe 33 to be located in the mulching film 2, and enabling the other end of the U-shaped pipeline 3 to be located outside the mulching film 2 and communicated with the atmosphere; the corn is sown in wide and narrow rows, the big row is 65 cm, and the small row is 40 cm.
S4, seedling emergence management and soil fertilizer management; thinning when the corn seedlings grow to 3-4 leaves, wherein the density of the corn seedlings is about 3000 plants per mu generally, and setting seedlings when the leaves grow to 5-6 leaves; and (4) dressing nitrogen fertilizer in the corn jointing stage and the horn mouth stage.
And S5, harvesting the corn.
Example 4
An anti-aging and yield-increasing mulching film mulching planting method for spring corn in rain-fed dry land comprises the following steps:
s1, ploughing soil, namely digging a groove in the soil 1 to be planted as shown in figure 1, paving a U-shaped pipeline 3 in the groove, arranging a filter screen 31 at one end of the U-shaped pipeline 3, and extending the other end of the U-shaped pipeline to the ground surface; the U-shaped pipeline 3 is also communicated with one end of a branch pipe 33, and the other end of the branch pipe 33 extends to the surface of the soil 1 to be planted and is positioned in the mulching film 2 to be covered subsequently; a duct port of one end of the branch pipe 33, which is far away from the U-shaped pipeline 3, is provided with a wind guide fin 34, and the wind guide fin 34 is rotatably connected to the inner wall of the branch pipe 33; concretely, there is the connecting rod at branch pipe 33 mouth of pipe department rigid coupling, rotates on the connecting rod to be connected with air guide wing 34, and air guide wing 34 is 3, and similar fan structure when branch pipe 33 has wind, can blow air guide wing 34 and rotate, and then form the air current in the plastic film, the other end of U-shaped pipeline 3 is located the plastic film 2 outside, and the rigid coupling has air-facing opening 32 on the mouth of pipe, air-facing opening 32 keeps away from the one end internal diameter of U-shaped pipeline 3 is greater than the U-shaped pipeline 3 internal diameter, specifically is 3 times, and the reason that sets up like this makes things convenient for outside wind to get into in U-shaped pipeline 3 more easily to drive air guide wing 34 and rotate.
S2, covering planting soil on the U-shaped pipeline paved in the S1, ridging, and enabling one end provided with the filter screen 31 to be in the ridge; the soil to be planted contains a water-retaining agent and straws, the straws have a tubular structure, and the straws are mixed in the soil to be planted, so that the connectivity inside the soil can be improved, a path is provided for the transmission of water and other nutrient components, and the length of the straws is 3-5 cm; the mass ratio of the using amount of the straws to the plowed soil to be planted is 0.5; the using amount of the water-retaining agent is 3% of the mass of the plowed soil to be planted.
S3, sowing corns on S2 ridges in the last ten days of April, sowing 4 jin in each mu, covering the mulching film 2, enabling the branch pipe 33 to be located in the mulching film 2, and enabling the other end of the U-shaped pipeline 3 to be located outside the mulching film 2 and communicated with the atmosphere; the corn is sown in wide and narrow rows, the large row is 70 cm, and the small row is 35 cm.
S4, seedling emergence management and soil fertilizer management; thinning the corn seedlings when the corn seedlings grow to 3-4 leaves, wherein the density of the corn seedlings is about 3000 plants per mu generally, and setting the seedlings when the leaves grow to 5-6 leaves; and (4) dressing nitrogen fertilizer in the corn jointing stage and the horn mouth stage.
And S5, harvesting the corn.
Comparative example 1
A method for planting spring corn in rain-fed dry land by plastic film mulching for preventing senescence and increasing yield is the same as that in example 1, except that a U-shaped pipeline is not laid below soil to be planted.
Comparative example 2
An anti-aging and yield-increasing mulching film mulching planting method for spring corn in rain-fed dry land is the same as that in example 1, except that water-retaining agents and straws are not contained in planting soil.
The embodiment of the invention takes corn planting as an example to illustrate the effect of the method, and particularly performs statistics on moisture, temperature and yield of the growth conditions of the corn in the embodiment and the comparative example:
wherein, the determination of the moisture index refers to that the planting soil is taken and dried, then the total amount before and after the drying is weighed, the moisture content is calculated, and the ratio of the moisture content to the initial planting soil mass is taken as the moisture content (%); during the corn growth, the temperature (. Degree. C.) in each group of the geomembranes was measured at the same time point, respectively. Referring to fig. 2-4, fig. 2 shows the water content data of each group, in comparative example 1, the pipeline structure is not laid under the planting soil, the water content is reduced compared with that of examples 1-4, and the temperature in the mulching film is increased compared with that of examples 1-4, which indicates that the pipeline can improve the water content of the soil and reduce the temperature in the mulching film, thereby improving the corn yield; in comparative example 2, water content of soil is reduced compared with that of example 1 without adding a water retention agent and straw, and temperature in the mulching film is not affected (as shown in fig. 3), which further illustrates that laying pipes can reduce temperature in the mulching film, and from the above results, the strategy of heat dissipation by arranging pipes is feasible, and under the premise of using the mulching film, soil can be maintained to have a certain water content, and the influence on corn growth caused by overhigh temperature in the mulching film can also be prevented, and fig. 4 is corn yield data of each group, and from fig. 4, yield of comparative example 1 without laying pipes is reduced due to the influence on corn growth caused by temperature rise in the mulching film. Therefore, the strategy of laying the pipeline is feasible, and the influence of temperature rise on the growth of the corn can be reduced while the water content of the soil is ensured.
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, it is intended that such changes and modifications be included within the scope of the appended claims and their equivalents.
Claims (8)
1. An anti-aging and yield-increasing mulching film mulching planting method for spring corn in rain-fed dry land is characterized by comprising the following steps:
s1, reforming soil to be planted:
firstly, ploughing soil to be planted, then digging a groove in the soil to be planted, paving a U-shaped pipeline (3) in the groove, arranging a filter screen (31) at one end of the U-shaped pipeline (3), installing a branch pipe (33) on the U-shaped pipeline (3), covering the dug soil to be planted on the U-shaped pipeline (3), enabling one end of the U-shaped pipeline (3) provided with the filter screen (31) to be located below the soil, and enabling the other end of the U-shaped pipeline (3) and one end of the branch pipe (33) far away from the U-shaped pipeline (3) to be located above the soil respectively;
s2, ridging and sowing the soil to be planted above the filter screen (31), covering a mulching film (2) on the ridge, enabling one end, far away from the U-shaped pipeline (3), of the branch pipe (33) to be located inside the mulching film (2), and enabling the other end of the U-shaped pipeline (3) to be located outside the mulching film (2) to be communicated with the atmosphere;
and S3, performing seedling emergence management, soil and fertilizer management and harvesting.
2. The method for planting spring corn with anti-aging and yield increasing functions in the rain-fed dry land as claimed in claim 1, wherein the branch pipes (33) are rotatably connected with wind guide fins (34) at pipe orifices of one ends far away from the U-shaped pipelines (3).
3. The method for planting spring corn in rain-fed dry land by mulching for anti-aging and increasing yield according to claim 1, wherein an air inlet (32) is fixedly connected to a pipe orifice at one end of the U-shaped pipeline (3) outside the mulching film (2), the air inlet (32) is horizontally arranged, and the inner diameter of one end, far away from the U-shaped pipeline (3), of the air inlet (32) is larger than that of the U-shaped pipeline (3).
4. The method for planting spring corn in rain-fed dry land by mulching to prevent senescence and increase yield as claimed in claim 1, wherein the soil to be planted contains water-retaining agent and straw, and the length of the straw is 3-5 cm.
5. The method for planting spring corn in the rain-fed dry land by mulching for preventing senescence and increasing yield as claimed in claim 4, wherein the mass ratio of the straw to the plowed soil to be planted is 0.3-0.5.
6. The method for planting spring corn in rain-fed dry land by mulching to prevent senescence and increase yield as claimed in claim 4, wherein the amount of the water retention agent used is 2% -5% of the mass of the soil to be planted.
7. The method for planting spring corn in rain-fed dry land by mulching to prevent senescence and increase yield as claimed in claim 1, wherein in S2, wide and narrow rows are adopted to sow corn, the width of the rows is 60-70 cm, and the width of the rows is 35-45 cm.
8. The method for planting spring corn in rain-fed dry land by mulching to prevent senescence and increase yield as claimed in claim 1, wherein in S3, thinning is performed when the corn seedlings grow to 3-4 leaves, and final singling is performed when the corn seedlings grow to 5-6 leaves, and nitrogen fertilizers are applied during the corn jointing stage and the horn mouth stage.
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