One-season double-harvest planting method for fresh corn in northeast region

Abstract

The invention relates to the technical field of agricultural planting methods, in particular to a one-season double-harvest planting method for fresh corn in the northeast region. According to the one-season double-harvest planting method for the fresh corn in the northeast region, a brand new technical mode for planting the fresh corn is provided for northeast single-season agricultural areas, one-year-one-harvest one-year is changed into one-year-two-harvest one-year, the ear number and the standard reaching rate are more than one time higher than those of common planting, the harvested fresh corn straw is high-quality green feed, and the yield is high. The multiple cropping index reaches 2.0, the multiple cropping income ratio reaches 2.1-3.2, the land output and economic benefits are multiplied, meanwhile, low-cost and high-benefit large-scale production and processing of the fresh corn are achieved, a new way is developed for village revival and farmer richness, and then powerful support is provided for village industry revival and farmer richness.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural planting methods, and in particular to a one-season double-harvest planting method for fresh corn in Northeast China. Background Art

[0002] my country's Northeast region, with its vast arable land, plays a crucial role in ensuring national food security. However, local climatic conditions present an insurmountable barrier, significantly limiting agricultural production. As a result, the region typically only grows one crop per year.

[0003] Take fresh corn, for example. Even though it has a short growing season, it can only be planted and harvested once a year in Northeast China. Once the fresh corn is harvested, the remaining effective temperature accumulation time becomes a thorny issue. This time is either left unused or used solely to grow fast-growing vegetables with short growth cycles. However, the economic benefits of these fast-growing vegetables are very limited, failing to fully tap the land's potential.

[0004] This situation has directly led to long-term low land utilization and output rates. A significant amount of land resources have not been efficiently utilized, and the agricultural products produced, both in quantity and value, fall far short of the land's potential production capacity. This not only restricts the growth of the agricultural economy in Northeast China but also results in the irrational use of precious land resources, becoming a key technical challenge that urgently needs to be overcome in the region's agricultural development. Improving land utilization and output rates within limited climatic conditions has become a pressing issue for agricultural researchers and practitioners. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a planting method for double harvests of fresh corn in one season in the Northeast region. The planting method provided by the present invention realizes double harvests of fresh corn in one year in the vast Northeast region, exponentially increases land utilization rate and output rate, greatly improves farmers' planting efficiency and income level, and has high social value and economic value.

[0006] The present invention provides a method for planting fresh corn in Northeast China with double harvests in one season, comprising the following steps:

[0007] Step 1: Arrange the sown land from March 20 to April 10 of the current year and arrange it into a plurality of trapezoidal planting ridges, wherein adjacent trapezoidal planting ridges share a bottom ridge edge, the bottom width of the trapezoidal planting ridges is 80 to 120 cm, and the top width of the trapezoidal planting ridges is 60 to 80 cm. The arranged planting ridges are covered with film at intervals, that is, the trapezoidal planting ridges with film paving and the trapezoidal planting ridges without film paving are arranged alternately;

[0008] Step 2: Planting fresh corn on the trapezoidal planting ridges covered with mulch with a row spacing of 40-60 cm from April 15 to May 10 of the current year;

[0009] Step 3: From June 10th to July 10th of the same year, plant fresh corn on trapezoidal planting ridges without mulch, with a row spacing of 40-60 cm;

[0010] Step 4: Harvest the fresh corn in step 2 between July 10 and August 10 of the current year;

[0011] Step 5: Harvest the fresh corn in step 3 between September 10 and September 30 of the same year.

[0012] Compared with the prior art, the purpose of setting up the trapezoidal planting ridges in the present invention is to ensure that there is a spatial distance of more than 140-180 cm between the double rows of corn on the ridge and the double rows of corn on the ridge separated by one ridge, which is sufficient to form a side row effect, so as to ensure that the fresh corn can grow normally and meet the harvest standards under the condition of double dense planting, and at the same time it is beneficial to reduce the soaking of the corn roots by rainwater in rainy seasons; at the same time, laying the ground film can increase the ground temperature and facilitate early sowing and early harvesting, and it also has the effect of preventing and controlling weeds without the use of herbicides, thereby reducing the adverse factors in the co-growth process of two crops of fresh corn, further improving the yield, and thus obtaining more accurate technical effects.

[0013] The interval film covering specifically means that the trapezoidal planting ridges include trapezoidal planting ridges with mulch films laid, and a trapezoidal planting ridge not covered with mulch films is located between any two of the trapezoidal planting ridges with mulch films laid.

[0014] In some embodiments, in step 1, the bottom width of the trapezoidal planting ridge is 90 cm, and the top width of the trapezoidal planting ridge is 60 cm.

[0015] In some embodiments, in step 2, the fresh corn is planted in double rows on the trapezoidal planting ridges with a row spacing of 40 to 50 cm, and the fresh corn is planted in pairs per hole, and the spacing between the fresh corns in the same row is 30 to 40 cm.

[0016] In some specific embodiments, the row spacing is 40 cm, and the plant spacing is 35 cm.

[0017] In some embodiments, in step 3, the fresh corn is planted in double rows on the trapezoidal planting ridges with a row spacing of 40 to 50 cm, and the fresh corn is planted in pairs per hole, and the hole spacing of the fresh corn in the same row is 30 to 40 cm.

[0018] In some specific embodiments, the row spacing is 40 cm, and the hole spacing is 35 cm.

[0019] Experiments have shown that sowing in the above-mentioned large-spacing, one-hole, two-plant pattern has a higher ear formation rate than planting a single plant with a small spacing. Double-plant planting is also beneficial to improving lodging resistance and further increasing yield, thereby obtaining more accurate technical results.

[0020] In some specific embodiments, in step 4 and step 5, the harvesting further includes collecting the straw of the fresh corn as green fodder.

[0021] In some specific embodiments, in step 5, the harvesting further includes collecting the straw of the fresh corn as green fodder.

[0022] In some specific embodiments, the step further includes applying fertilizer to the fresh corn in step 2 and / or step 3, wherein the fertilizer includes 8-15 kg / mu of urea, 100-200 mL / mu of EM microbial agent, 0.1-0.4 kg / mu of potassium dihydrogen phosphate, and 0.3-0.6 g / mu of sodium nitrophenolate.

[0023] In some specific embodiments, the variety of fresh corn includes at least one of Overland sweet corn, Xuetian 7401 sweet corn, Tianxiangnuo No. 9 and Wannuo 2000.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a new technical model for fresh corn cultivation in Northeast China's single-season agricultural areas, changing the annual one-crop, one-harvest method to two-crop, two-harvest method. The method increases the number of ears and the compliance rate by more than double those of ordinary planting, achieves a multiple cropping index of 2.0, and a multiple cropping benefit ratio of 2.1-3.2, thus doubling the land output and economic benefits.

[0026] 2. The planting method provided by the present invention can increase the number of fresh corn plants per hectare in Northeast China from about 60,000 plants per year (one crop per harvest) to 12,000-13,000 plants per year (two crops per harvest), exponentially increasing output and economic benefits. The low-cost, high-efficiency large-scale production and processing of fresh corn opens up a new path for rural revitalization and farmers' prosperity.

[0027] 3. The fresh corn stalks harvested by the planting method provided by the present invention are high-quality green fodder. The exponentially increased fresh corn stalks can provide strong support for the development of the animal husbandry industry, and further provide strong support for the revitalization of rural industries and the enrichment of farmers. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram showing the regulation and interval mulching of land consolidation;

[0029] Figure 2 A schematic diagram of a field showing land preparation;

[0030] Figure 3 Schematic diagram showing the spatial distribution of spring corn;

[0031] Figure 4 Schematic diagram showing the symbiotic period of spring-sown and summer-sown corn;

[0032] Figure 5 Schematic diagram showing the spatial distribution of summer corn after spring corn harvest;

[0033] Figure 6 A picture showing the appearance of the field after spring corn planting with film covering;

[0034] Figure 7 Pictures showing the appearance of double-row planting of spring corn and reserved ridges for summer corn in actual production;

[0035] Figure 8 The picture shows the appearance of two plants per hole in spring corn planting in actual production;

[0036] Figure 9 The picture shows the coordinated growth of spring corn in the grain filling stage and summer corn in the seedling stage on spaced ridges in actual production. DETAILED DESCRIPTION

[0037] The present invention provides a method for planting fresh corn in Northeast China with double harvests in one season. Those skilled in the art can refer to the contents of this article and appropriately improve the process parameters to achieve the desired effect. It should be noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0038] 1. Adaptive "land preparation" in early spring: In early April, the land to be planted with fresh corn should be prepared appropriately to form ridges 80-120 cm wide. The ridges should be pressed and leveled to form trapezoidal ridges with a bottom width of 80-120 cm and a top width of 60-80 cm (see Figure 1 The technical purpose of land consolidation is to ensure that there is a spatial distance of more than 140-180 cm between the double rows of corn on the ridge and the double rows of corn on the ridge between them, which is enough to form a border effect. This ensures that the fresh corn can grow normally and meet the harvest standards under the double-density planting conditions. It also helps to reduce the soaking of the corn roots by rainwater during rainy seasons.

[0039] The land preparation system is the best result obtained through several years of research and test improvements. The existing planting ridge spacing in Northeast China is generally 60-65 cm. We have tried planting modes such as single-row planting with alternate ridges and double-row planting with alternate ridges, which only increased production by 14-20% compared with traditional planting. Compared with the 100-120% yield increase of the "fresh corn harvested twice in spring and summer and twice in summer and autumn" mode, the yield increase effect is not good. The main problems are: since it is difficult to form a side row effect, dense planting leads to an ear formation rate and a qualified rate of only about 65%, and the increase in yield is limited; the small ridges and ditches are shallow, and the rainwater cannot be drained smoothly during the rainy season, which takes a long time to soak the corn roots, affecting the normal respiration and function of the corn roots, and affecting the ear formation rate and taste quality.

[0040] 2. "Interval mulching" of ridges to plant and harvest early: After land preparation is completed, mulch the ridges at intervals, that is, 1st, 3rd, 5th, 7th, 9th... ridges are mulched; 2nd, 4th, 6th, 8th, 10th... ridges are not mulched (e.g. Figure 1 shown).

[0041] The purpose of mulching is to raise ground temperatures, facilitating early planting and harvesting. Spring corn typically coexists with summer corn for approximately 50 days. During this period, the tall spring corn inevitably crowds out and shades the smaller summer corn, affecting its normal growth and development, and consequently, its yield and quality. Planting spring corn with mulch can bring the spring corn harvest 15-20 days earlier, shortening the coexistence period to approximately 30 days. This allows the summer corn to only coexist with the tall spring corn during the seedling stage. Adverse stress during this stage has minimal impact on its final yield, thus ensuring a normal yield. Experimental plantings have shown that mulching spring corn with mulch can increase the number of effective ears of summer corn by 30-35%. Mulching also effectively controls weeds, eliminating the need for herbicides, achieving environmentally friendly farming practices.

[0042] 3. "Half-planted, Half-idle" Spring Corn Planting with Mulch and Closely Planted Side Rows: In mid-to-late April, when frost is no longer severe, use a precision hole drill to sow fresh corn in two rows at a high density, 40-50 cm row spacing and 30-40 cm plant spacing, using a precision hole drill. Normal corn management practices are followed during the growing season.

[0043] The unmulched half of the ridges are temporarily unused pending summer planting. Leaving half the ridges unused isn't a waste; it's a deliberate effort to reserve more space for spring corn planting. This allows each corn plant to grow as if it were in a side row, thus reaping the "side row advantage." This advantage can then be leveraged to achieve denser planting, increasing the number of plants planted and yield.

[0044] Comparative experimental planting shows that sowing with a large plant spacing of 30-40 cm in one hole and two plants has a 9.5-12% higher ear formation rate than sowing with a single plant spacing of 15-20 cm. Double plant planting is also beneficial to improving lodging resistance.

[0045] 4. "Off-season Planting" Harmonious Coexistence of Spring and Summer Corn: In mid-to-late June, spring corn has entered its flowering and pollination phase. Summer corn for fresh consumption is now sown densely in two rows on previously unused ridges, with row spacing of 40-50 cm and plant spacing of 30-40 cm, with two plants per hole.

[0046] "Off-season planting" allows the spring corn in the filling stage and the summer corn in the seedling stage to grow in coordination on ridges spaced apart from each other. By the time the summer corn enters the weaning stage and needs sunlight and rain, the spring corn has been harvested and removed. The summer corn has the entire growing space to itself and also enjoys the advantage of the "edge row effect," ensuring a good harvest.

[0047] 5. "Transferring space" for spring-sown corn to summer harvest: From late July to early August, the spring-sown fresh corn reaches the harvest standard, and the corn stalks are harvested and cut, thereby transferring the growth space to the summer-sown corn in the weaning period. The summer-sown corn then takes over all the growth space and sunlight and rain from the spring-sown corn, and grows and develops rapidly under the blessing of the artificial "edge row effect". The adverse stress during the symbiotic period with the spring-sown corn will not have a visible negative impact on its final yield.

[0048] 6. Promote the growth of summer corn seedlings: After the spring-sown summer corn is harvested, fertilize and spray the summer corn with trace elements, crop growth regulators and microbial compound liquid fertilizers in time. Apply 8-15 kg of urea per mu according to the soil fertility. You can spray 60 kg / mu of a mixture of 0.1%-0.2% EM microbial agent, 0.5%-1.0% potassium dihydrogen phosphate and 0.5 g of sodium nitrophenolate once to promote the rapid growth and development of summer corn.

[0049] 7. Autumn Harvest of Summer Corn: By mid-to-late September, the summer-sown autumn-harvested corn has reached harvest standards, and the mature corn ears and corn stalks are harvested in due time. This completes the spring and summer harvests of fresh corn in Northeast China.

[0050] In order to further improve the land utilization rate, this technical solution includes planting fast-growing vegetables with a short growth period or spring wheat, short-growth period soybeans and other grain crops on half of the temporarily idle ridges without affecting the normal operation of the new planting mode of "fresh corn harvested twice in spring and summer and twice in summer and autumn" to further improve the planting efficiency. Therefore, various disguised and deformed operations including the above-mentioned main contents such as "land preparation and ridge planning", "interval mulching", "off-season sowing", "double-row dense planting", "one hole and two plants" are covered by the scheme of the present invention and are all within the protection of the present invention.

[0051] The materials used in the present invention are all common commercial products and can be purchased on the market. The present invention will be further described below with reference to the embodiments.

[0052] Example 1

[0053] The technical method disclosed in this invention has been used in a round of experimental planting in Chaluhe Town, Yongji County, Jilin Province. Taking the 225 mu of experimental planting in Chaluhe Town as an example, the specific planting method is as follows:

[0054] 1. Early spring land preparation: In early April (April 2nd in this example), the land to be planted with fresh corn is prepared to form 90 cm wide ridges. The ridges are then flattened to form trapezoidal ridge platforms (also called trapezoidal planting ridges) with a bottom width of 90 cm and a top width of 60 cm. The schematic diagram of the structure is shown below. Figure 1 As shown, the actual objects in the field are as follows Figure 2 The technical purpose of land consolidation is to ensure that there is a sufficient distance of 140-180 cm between the double rows of corn on the ridge and the double rows of corn on the ridge between them, enough to create a border effect. This ensures that the fresh corn can grow normally and meet the harvest standards even when planted at double the density. It also helps to reduce the soaking of the corn roots by rainwater during rainy seasons.

[0055] 2. Cover the ridges with film to increase temperature: After the land preparation is completed, cover the ridges with film (in this case, April 2), that is, cover the 1st, 3rd, 5th, 7th, 9th... ridges with film; do not cover the 2nd, 4th, 6th, 8th, 10th... ridges with film (such as Figure 1 and Figure 6 shown).

[0056] 3. Spring planting and summer harvest corn under film (such as Figure 3 As shown): In mid-to-late April (April 22 in this example) when there is no frost, use a precision hole seeder to plant two plants per hole on a mulched ridge with a row spacing of 40 cm and a plant spacing (hole spacing) of 35 cm (as shown in the figure). Figure 8 Fresh corn (Overland, the variety specified by the purchaser) was sown densely in double rows (as shown), with a sowing rate of 63,500 kernels per hectare. After emergence, the corn can be managed normally, with the unmulched half of the ridges temporarily idle for summer planting. The double rows of spring corn and the reserved ridges for summer corn are shown in the following images. Figure 7 Leaving half of the ridges temporarily idle is not a waste; rather, it is a deliberate effort to reserve more growing space for spring corn. This allows each corn plant to grow as if it were in a side row, thus gaining the "side row advantage." This "side row advantage" can then be used to achieve "side row dense planting," increasing the number of plants planted and yield.

[0057] 4. Planting summer corn in off-season (e.g. Figure 4As shown: In mid-to-late June, spring corn has entered the flowering and pollination stage. At this time, fresh corn is still planted in double rows on previously unused ridges, with a row spacing of 40 cm and plant spacing of 35 cm, with 63,500 seeds per hectare of the Overland variety (in this case, on June 25). "Staggered planting" allows the spring corn in its grain-filling stage to grow in harmony with the summer corn in its seedling stage on the alternate ridges (as shown). Figure 9 As shown in the figure, by the time the summer corn enters the weaning stage and needs sunlight and rain, the spring corn has been harvested and removed. The summer corn has the entire growing space to itself and also enjoys the advantage of the "edge row effect".

[0058] In steps 2-4 above, the purpose of applying mulch is to raise ground temperature, facilitating early planting and harvesting. Spring corn always coexists with summer corn for approximately 50 days. During this period, the taller spring corn inevitably crowds out and obscures the smaller summer corn, impacting its normal growth and development, and thus its yield and quality. Planting spring corn with mulch can bring the spring corn harvest 15-20 days earlier, reducing the coexistence period between spring and summer corn to approximately 30 days. This allows summer corn to only coexist with the taller spring corn during the seedling stage. Adverse stress during this stage has minimal impact on its final yield, thus ensuring a normal yield for summer corn.

[0059] 5. Summer Harvest of Spring Corn: By mid-to-late July (July 21st in this example), the spring corn reaches harvest standards (the commercial standard for the Overland variety is a cob length of no less than 22 cm and a weight of no less than 220 g), with an average harvest of 58,620 ears of fresh corn per hectare. After harvest, the corn stalks are promptly cut to allow the summer corn in its seedling stage to grow. The diagram after harvest is as follows: Figure 5 As shown, summer corn follows spring corn and has exclusive access to all growing space, sunlight and rain. It grows and develops rapidly under the artificial "edge row effect". The adverse stress during the symbiotic period with spring corn will not have a visible negative impact on its final yield.

[0060] 6. Strengthening Summer Corn Seedlings and Promoting Growth: After harvesting spring-sown summer corn, promptly fertilize and spray with trace elements, crop growth regulators, and microbial compound liquid fertilizer. Depending on soil fertility and growth conditions, apply 8-15 kg of urea per mu (approximately 100-200 ml) of EM microbial inoculant concentrate (effective viable count greater than 10 billion), 100-200 g of potassium dihydrogen phosphate, and 0.5 g of sodium nitrophenolate (20 kg) per mu (in this case, on July 26 and August 15) to promote rapid growth and development of the summer corn.

[0061] 7. Autumn Harvest of Summer Corn: By mid-to-late September, the summer-sown autumn-harvest corn had reached harvest standards and was harvested on time (in this case, September 26th). The average yield per hectare was 61,540 ears of fresh corn meeting standards. This successfully completed the spring and summer harvests of fresh corn in Northeast China.

[0062] The control group used a traditional planting pattern: The control group planted individual plants in a single row with 60 cm ridges and 22 cm spacing. Both the control group and this example planted Overland. The control group planted 69,000 seeds per hectare on May 15th, and the planting management was the same as the experimental group. By harvest time on August 13th, the average yield per hectare of corn met the standard, 46,750 ears.

[0063] In 2024, the new model experimental fields in Chaluhe Town yielded an average of 120,160 ears of fresh corn per hectare, compared to an average of 46,750 ears per hectare under traditional planting. The fresh corn yield under the "two crops in spring and summer, two harvests in summer and autumn" model was 2.57 times greater than the control model. The multiple cropping index (the ratio of the area planted to the total area of ​​arable land in a year) was 2.0. This means that the area and number of plants planted for spring corn equaled the total area and the total number of plants planted under traditional planting, while the summer corn planted also equaled the total area and the total number of plants planted under traditional planting, meaning that both spring and summer plantings resulted in a single harvest, resulting in a multiple cropping index of 2.0. The multiple cropping benefit ratio (the ratio of the total benefits of multiple cropping to the benefits of traditional single-season planting) reached 3.15, exceeding the multiple cropping index of 2.0. Since the planting method is two crops and two harvests in one season, the yield is greatly increased, and the fixed land rental cost (the annual land rent per hectare in Northeast China is 12,000-16,000 yuan) is diluted by two crops and two harvests, which is equivalent to halving the land cost for planting in each season of spring and summer. Therefore, the multiple cropping profit ratio will naturally be much higher than the multiple cropping index.

[0064] Example 2

[0065] The specific planting method in this embodiment is the same as that in Example 1, with the following specific differences:

[0066] In the early spring land preparation, the planting ridge width is set to 60 cm, single ridge and single row are sown in spring and summer, the single plant spacing is 30 cm, and 27555 seeds are sown in spring and summer respectively. The rest is the same as in Example 1.

[0067] In the present embodiment, the average harvest per hectare reached 25,440 ears of spring-planted fresh-eating corn, and 13,520 ears of summer-planted fresh-eating corn, totaling 38,960 ears. Because 60 centimeters of ridge width is too narrow, even if the planting ridges are spaced apart and sown, the row spacing is only 120 centimeters, which cannot form an effective side row effect. Particularly, the tall spring-planted corn in the symbiotic period has a huge impact on the summer-planted corn in the seedling stage, and the weak seedling ratio of summer-planted corn is large, and the ear formation rate and the compliance rate are very low, so the total output is far lower than the harvest amount of Example 1.

[0068] Example 3

[0069] The specific planting method in this embodiment is the same as that in Example 1, with the following specific differences:

[0070] After the land preparation is completed, no film covering treatment is performed, and the rest is the same as in Example 1.

[0071] In this embodiment, the harvest time of spring-sown corn is delayed by 10 days compared with that in Example 1, and the average harvest per hectare is 58,310 ears of spring-sown fresh corn and 41,850 ears of summer-sown fresh corn.

[0072] Experimental plantings have shown that planting spring corn under plastic film mulch can bring its harvest date about 10 days earlier, shortening the symbiotic period between spring and summer corn by about 10 days. This significantly reduces shading and crowding out of summer corn by spring corn, resulting in healthier and stronger summer corn seedlings. A comparison of 61,540 ears of summer corn harvested from spring corn planted under plastic film mulch versus 41,850 ears harvested from unmulched corn shows a 32% decrease in the number of effective ears of summer corn planted without plastic film mulch. Unmulched corn also requires the use of herbicides for weed control.

[0073] Example 4

[0074] The specific planting method in this embodiment is the same as that in Example 1, with the following specific differences:

[0075] When planting spring corn and summer corn, the planting spacing is set to 18 cm, single hole single plant, and the rest is the same as in Example 1.

[0076] In this example, the average harvest per hectare reached 53,640 ears of fresh corn planted in spring, and 54,155 ears of fresh corn planted in summer. The harvest results of Comparative Example 1 show that sowing with a large plant spacing of 30-40 cm in a single hole with two plants increased the ear formation rate by 9.3% and 13.6%, respectively, compared to single-plant planting with a plant spacing of 18 cm. Twin planting improves ventilation and light conditions and lodging resistance, thereby increasing yield.

[0077] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-harvest planting method for fresh corn in Northeast China, characterized in that: The steps include: Step 1: Arrange the sown land from March 20 to April 10 of the same year and arrange it into a plurality of trapezoidal planting ridges, wherein adjacent trapezoidal planting ridges share a bottom ridge ditch, the bottom width of the trapezoidal planting ridges is 80 to 120 cm, and the top width of the trapezoidal planting ridges is 60 to 80 cm. The arranged planting ridges are covered with film at intervals, so that the trapezoidal planting ridges with film and the trapezoidal planting ridges without film are alternately distributed; Step 2: Planting fresh corn on the trapezoidal planting ridges covered with mulch with a row spacing of 40-60 cm from April 15 to May 10 of the current year; Step 3: From June 10th to July 10th of the same year, plant fresh corn on trapezoidal planting ridges without mulch, with a row spacing of 40-60 cm; Step 4: Harvest the fresh corn in step 2 between July 10 and August 10 of the current year; Step 5: Harvest the fresh corn in step 3 between September 10 and September 30 of the same year.

2. The planting method according to claim 1, characterized in that In step 1, the bottom width of the trapezoidal planting ridge is 90 cm, and the top width of the trapezoidal planting ridge is 60 cm.

3. The planting method according to claim 1, characterized in that In the step 2, the fresh corn is planted in double rows on the trapezoidal planting ridges with a row spacing of 40 to 50 cm. The fresh corn is planted in pairs in each hole, and the hole spacing of the fresh corn in the same row is 30 to 40 cm.

4. The planting method according to claim 3, characterized in that: The row spacing is 40 cm, and the hole spacing is 35 cm.

5. The planting method according to claim 1, characterized in that: In the step 3, the fresh corn is planted in two rows on the trapezoidal planting ridges with a row spacing of 40 to 50 cm. The fresh corn is planted in pairs in each hole, and the fresh corn in the same row has a plant spacing of 30 to 40 cm.

6. The planting method according to claim 5, characterized in that: The row spacing is 40 cm, and the plant spacing is 35 cm.

7. The planting method according to claim 1, characterized in that: In step 4, the harvesting also includes collecting the straw of the fresh corn as green fodder.

8. The planting method according to claim 1, characterized in that: In step 5, the harvesting also includes collecting the straw of the fresh corn as green fodder.

9. The planting method according to claim 1, characterized in that: The method further includes applying fertilizer to the fresh corn in step 2 and / or step 3, wherein the fertilizer includes 8-15 kg / mu of urea, 100-200 mL / mu of EM microbial agent, 0.1-0.4 kg / mu of potassium dihydrogen phosphate, and 0.3-0.6 g / mu of sodium nitrophenolate.

10. The planting method according to any one of claims 1 to 9, characterized in that: The varieties of fresh corn include at least one of Overland sweet corn, Xuetian 7401 sweet corn, Tianxiangnuo No. 9 and Wannuo 2000.

Images