CN114521464B - Crop rotation planting method for soybean, wheat and corn - Google Patents

Crop rotation planting method for soybean, wheat and corn Download PDF

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CN114521464B
CN114521464B CN202210229611.8A CN202210229611A CN114521464B CN 114521464 B CN114521464 B CN 114521464B CN 202210229611 A CN202210229611 A CN 202210229611A CN 114521464 B CN114521464 B CN 114521464B
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wheat
corn
soybean
sowing
days
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CN114521464A (en
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杨晓琳
刘英博
熊晋冉
杜太生
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China Agricultural University
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00Cultivation of specific crops or plants not otherwise provided for
    • A01G22/40Fabaceae, e.g. beans or peas
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00Cultivation of specific crops or plants not otherwise provided for
    • A01G22/20Cereals

Abstract

The invention discloses a soybean, wheat and corn crop rotation planting method, which comprises the following steps: step 1: fertilizing and preparing soil in spring of the year, and sowing soybeans between 10 and 30 days after 4 months; step 2: fertilizing and preparing the harvested soybean stubble in the step 1, and sowing wheat between 1 and 15 days of 10 months; and step 3: after the wheat in the step 2 is mature, the wheat straws are crushed and no-tillage covering and returning to the field after stubble harvesting, and then corn is sowed; and 4, step 4: and (3) after the corn is harvested, repeating the step 1, the step 2 and the step 3. The soybean, wheat and corn crop rotation planting method can reduce water consumption and improve soil fertility.

Description

Crop rotation planting method for soybean, wheat and corn
Technical Field
The invention relates to the technical field of agricultural planting methods, in particular to a crop rotation planting method for soybean, wheat and corn.
Background
In the related technology, the planting mode of North China plain is winter wheat-summer corn double cropping in one year, and the production yield of wheat and corn respectively accounts for 52% and 30% of the total amount of China. However, rainfall distribution is uneven in the whole year in North China plain, 70% of water requirements in winter wheat growing seasons are met by pumping underground water for irrigation, the underground water level in the area is reduced at the speed of 1 meter per year, and a series of ecological problems are caused.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the inventor of the application researches and discovers that the wheat jade planting mode in the related technology causes the increase of the emission of greenhouse gases in farmlands due to frequent irrigation, high nitrogen application amount and high agricultural investment. In addition, the wheat-jade mode planting structure in the related technology is too single, the material and energy investment is single, a series of negative effects such as poor soil structure, aggravation of diseases, insect pests and weeds, great reduction of biological diversity, low economic income and the like are caused, and the development of the healthy and sustainable agriculture of the farmland ecosystem in the region is severely limited.
The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a soybean, wheat and corn rotation planting method which can reduce water consumption and improve soil fertility.
The soybean wheat corn crop rotation planting method provided by the embodiment of the invention comprises the following steps: step 1: fertilizing and preparing soil in spring of the year, and sowing soybeans between 10 and 30 days after 4 months; and 2, step: fertilizing and preparing the harvested soybean stubble in the step 1, and sowing wheat between 1 and 15 days of 10 months; and 3, step 3: after the wheat in the step 2 is mature, the wheat straws are crushed and no-tillage covering and returning to the field after stubble harvesting, and then corn is sowed; and 4, step 4: and (3) after the corn is harvested, repeating the step 1, the step 2 and the step 3.
In some embodiments, the soybean base fertilizer is applied before sowing soybeans, the soybean base fertilizer is diammonium phosphate, potassium sulfate and urea, and the application amount of the diammonium phosphate is 375kg/hm 2 The application amount of the potassium sulfate is 300kg/hm 2 The application amount of the urea is 180kg/hm 2
In some embodiments, the wheat base fertilizer is applied before wheat is sown, the wheat base fertilizer is diammonium phosphate and urea, and the application amount of the diammonium phosphate is 375kg/hm 2 The application amount of the urea is 3.3kg/hm 2
In some embodiments, topdressing is performed during the jointing stage of the wheat, and the application amount of the topdressing of the wheat is 416.7kg/hm 2
In some embodiments, the wheat is not irrigated when being sown, and the wheat is subjected to winter storage irrigation before winter, wherein the irrigation amount of the winter storage irrigation is 60-80 mm.
In some embodiments, sowing irrigation is carried out when the corn is sowed, the irrigation amount of the sowing irrigation is 60-80 mm, irrigation is carried out in the corn jointing stage, the irrigation amount of the corn jointing stage is 60-80 mm, top dressing is carried out in the corn jointing stage, and the application amount of the top dressing of the corn is 616.7kg/hm 2 And the soybean is irrigated in the sowing process, and the irrigation amount is 60-80 mm.
In some embodiments, the soybeans are treated to repel insects with an insect repellent applied at intervals of 5 to 7 days during the flowering period of said soybeans, the insect repellent being applied at a rate of 600ml/hm 2
In some embodiments, 100-200 times of pendimethalin is used for weeding in the ear sprouting period of the corn, and/or 800-1500 times of chlorthalon is used for in-out insect prevention treatment, 1300-1500 times of insect repellent is used in the jointing period of the wheat, and/or 1300-1500 times of disease prevention drug is used for spraying on the wheat at an interval of 5-7 days.
In some embodiments, the wheat is row-by-row tractor-ploughing, the wheat has a seeding row spacing of 15-25 cm, the corn is hole-sowed, the corn has a seeding row spacing of 40-50 cm, 1 or 2 seeds are in each seeding hole, and the corn has a seeding hole spacing of 25-30 cm.
In some embodiments, the stubble height of the wheat is 15-25 cm, the root system of the soybean remains in the soil after the soybean stubble is harvested, and the stubble height of the soybean is 5-6 cm.
Drawings
FIG. 1 is a schematic diagram of a soybean, wheat and corn crop rotation planting method in an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
The soybean, wheat and corn crop rotation planting method provided by the embodiment of the invention comprises the following steps:
step 1: fertilizing and preparing soil in spring of the year, and sowing soybean between 4 months and 10-30 days.
The planting method can avoid the influence of overlarge planting density on the strength of soybean root systems when the hole depth is 3-5 cm, the hole distance is 25-27 cm, and the line distance is 30-45 cm, namely the soybean root systems are weak and small when the planting density is overlarge, and the soybeans are easy to fall down to reduce the yield of the soybeans.
For example, the depth of the cavities may be 3, 3.5cm, 4cm, 4.5cm or 5cm, the pitch of the cavities 25cm, 25.5cm, 26cm, 26.5cm, 27cm, and the pitch of the rows 30cm, 35cm, 40cm or 45cm.
And 2, step: and (3) fertilizing and preparing soil after harvesting the soybean stubble in the step (1), and sowing wheat between 1 and 15 days of 10 months.
Before sowing wheat, the seeds are mixed with the octylsulfuric acid, the wheat is sown by ploughing the soil, flattening the soil and row sowing by machine, the row spacing of the wheat is 15 cm-25 cm, for example, the row spacing of the wheat is 15cm, 18cm, 20cm, 23cm and 25cm.
Preferably, the root system of the soybean after the soybean stubble is harvested is kept in the soil, the stubble height of the soybean is 5-6 cm, for example, the stubble height of the soybean is 5cm, 5.5cm and 6cm, the stubble height and the underground root system of the soybean are turned over in the soil before the next wheat is sowed, humus is formed to provide nutrients for the next crop, and the soybean stubble and underground root system can also replace part of inorganic fertilizer, thereby being beneficial to soil fertility cultivation and realizing sustainable development of agriculture.
And step 3: and (3) after the wheat in the step (2) is mature, the wheat straws are crushed and are applied to field without ploughing after stubble harvesting, and then the corn is sowed.
It should be noted that the stubble height of wheat is 15-25 cm, for example, the stubble height of wheat is 15cm, 18cm, 20cm, 23cm, 25cm, the wheat straw is uniformly covered on the ground surface after being crushed, thereby reducing wind erosion and keeping higher soil water content, and therefore, the moisture production benefit can be improved, the stability of crop production can be enhanced, and the yield and the resource utilization rate can be improved.
The corn is sowed in a hole sowing mode, the sowing row spacing of the corn is 40-50 cm, for example, the sowing row spacing of the corn can be 40cm, 42cm, 45cm, 48cm and 50cm. Each sowing hole has 1 or 2 seeds, and the sowing hole distance of the corn is 25-30 cm, for example, the hole distance is 25cm, 27cm, 28cm, 30cm. According to the planting method provided by the embodiment of the invention, when the row spacing and the number of the seeds of the corn are within the range, the proper corn seeding density is obtained, the photosynthesis of corn crops is increased under the planting density, the final yield reduction caused by the ontogeny deficiency due to the nutrition and water competition of the corn with overlarge density is avoided, and the reasonable planting density meeting the machine-ploughing condition is realized.
And 4, step 4: and (3) after the corn is harvested, repeating the step 1, the step 2 and the step 3.
Compared with the traditional wheat-corn mode, the soybean-wheat-corn crop rotation planting method provided by the embodiment of the invention has the advantages that the one-year-two-cropping planting mode is changed into the two-year-three-cropping mode, the annual water consumption is reduced, the drop of the underground water level is slowed down, the emission of greenhouse gases is reduced, the soil fertility in the stubble period is improved through the previous crop of rotation soybean, the nitrogen fixation effect of leguminous green manure is utilized, the nitrogen fertilizer input in wheat cultivation can be reduced, the potential continuous cropping obstacle is eliminated, the contents of organic matters in farmland soil plough layers and effective N, P and other nutrients can be obviously improved by returning wheat straws to the field and leaving the soybean stubble and roots on the field, and further, part of inorganic fertilizer can be replaced, the soil fertility can be improved, the sustainable development of agriculture can be realized, the roots of the soybean are remained on the farmland, the wind erosion can be reduced, the higher soil can be kept, and the wheat growth benefit of next season wheat can be further used for the growth of wheat, so that the water content of water can be improved, the crop production stability can be enhanced, and the yield and the resource utilization rate can be improved.
In some embodiments, the soybean base fertilizer is applied before the soybeans are sown, the soybean base fertilizer is diammonium phosphate, potassium sulfate and urea, and the application amount of the diammonium phosphate is 375kg/hm 2 The application amount of the potassium sulfate is 300kg/hm 2 The application amount of urea is 180kg/hm 2 The base fertilizer is supplemented in the seedling stage of the soybeans, so that the growth and development of the soybeans in the early growth stage are facilitated, the nitrogen fixation capacity of the soybean crops in the later stage is reduced due to too low amount of the base fertilizer, and the soil fertility leaching loss is serious due to excessive fertilization.
In some embodiments, the wheat base fertilizer is applied before wheat is sown, the wheat base fertilizer is diammonium phosphate and urea, and the application amount of the diammonium phosphate is 375kg/hm 2 The amount of urea applied was 3.3kg/hm 2 . The nitrogen-reducing fertilization reduces the carbon emission of soil while ensuring the annual yield of crop rotation, and is an effective fertilization system for realizing the aim of carbon neutralization.
In some embodiments, topdressing is performed during the jointing period of wheat, and the top dressing amount of the wheat is 416.7kg/hm 2
In some embodiments, the wheat is not irrigated when being sown, and the wheat is irrigated in winter before winter, wherein the irrigation amount of the winter storage irrigation is 60-80 mm.
The wheat is sown without sowing and irrigating, the wheat is stored and irrigated in winter before winter, and the irrigation quantity of the winter storage tank can be 60cm, 65cm, 70cm, 75cm and 80cm, so that the wheat can live through the winter smoothly, and the yield of the wheat is improved.
In some embodiments, the sowing irrigation is carried out when the corn is sowed, the irrigation amount of the sowing irrigation is 60-80 mm, the irrigation is carried out in the corn jointing stage, the irrigation amount of the corn jointing stage is 60-80 mm, the top dressing is carried out in the corn jointing stage, and the application amount of the top dressing of the corn is 616.7kg/hm 2 And the soybean is irrigated in the sowing process, and the irrigation quantity is 60-80 mm.
For example, the irrigation amount of sowing irrigation can be 60cm, 65cm, 70cm, 75cm and 80cm, the germination rate of the corn is guaranteed, the irrigation amount of the corn in the jointing stage can be 60cm, 65cm, 70cm, 75cm and 80cm, the growth of the corn is guaranteed, and the yield of the corn is improved.
In some embodiments, the soybeans are treated to repel insects with an insect repellent applied at 600ml/hm intervals of 5 to 7 days during the flowering period of the soybeans 2
The type of the insect repellent can be chlorfenapyr or lufenuron or a mixed solution of chlorfenapyr and lufenuron, the number of times of applying the insect repellent in the flowering period of the soybeans is two, the time interval between the two application is 5-7 days, for example, 5 days, 6 days or 7 days can be separated, the application of the insect repellent in the flowering period of the soybeans can prevent aphid breeding, the application of the insect repellent is performed twice, and the application interval between the two application of the insect repellent is 5-7 days, so that the use amount of the insect repellent can be reduced, and the insect repellent effect can be improved.
In some embodiments, 100-200 times of pendimethalin is used for weeding in the ear sprouting period of the corn, and/or 800-1500 times of chlorthalon is used for in-and-out insect prevention treatment, 1300-1500 times of insect repellent is used in the jointing period of the wheat, and/or 1300-1500 times of disease prevention drug is used for spraying on the wheat at an interval of 5-7 days.
It should be noted that pendimethalin alone or dichlorvos alone or both can be administered during the corn ear emergence period, for example, the dilution ratio of pendimethalin is 100 times, 150 times, 200 times, and the dilution ratio of dichlorvos is 800 times, 900 times, 1200 times, 1350 times, 1450 times, or 1500 times. Weeds in cultivated lands can be removed by applying pendimethalin, nutrients required by corn production are ensured, pest and disease damage of corn can be prevented by applying chlorthalon, and the corn yield is improved.
The anthelmintic is applied alone or the pesticide is applied alone or both in the jointing stage of wheat, for example, the anthelmintic can be dichlorvos, acetamiprid or a mixture of dichlorvos and acetamiprid, the anthelmintic can be diluted 1300 times, 1350 times, 1400 times, 1450 times or 1500 times, and the anthelmintic can be applied in an amount of 1.5kg/hm 2 The disease-preventing medicine can be azoxystrobin, and the anthelmintic can be diluted 1300 times, 1350 times, 1400 times, 1450 times or 1500 times.
For example, the application times of the insect repellent and the disease repellent can be two times, the interval between the two application times is 5 days, 6 days or 7 days, insect pest breeding can be prevented by applying the insect repellent and the disease repellent, the growth of wheat is ensured, the yield of the wheat is improved, the insect repellent and the disease repellent are applied twice, and the interval between the two application times is 5-7 days, so that the use amount of pesticides can be reduced, and the insect repelling effect can be improved.
Some specific exemplary soybean, wheat, and corn crop rotation planting methods of the present invention are described below with reference to fig. 1.
1. Test site, test material and test article
1. Test site: the experiment is carried out at an ecological experimental station (N37 degrees 50', E113 degrees 40', and an altitude of 50.1 m) of Koelreuteria paniculata in Koelreuteria Koenigii county, shijiazhuang, hebei province, belongs to semi-humid and semi-arid climate in continental seasonal wind and warm zones, has the main climate characteristics of clear four seasons, high temperature and heavy rain in summer, cold and drought in winter, the annual total radiation quantity of 543.3KJ cm-3, the annual average temperature of 12.2 ℃, the monthly average maximum temperature of 26.4 ℃, the monthly average minimum temperature of one month of (-3.9 ℃), the accumulated temperature of not less than 0 ℃ of 4710 ℃, the accumulated temperature of not less than 10 ℃ of 4232 ℃, the annual sunshine hours of 2500-2800 hours, the frost-free period of 200 days, the annual rainfall of 400-550mm, 80 percent of the rainfall of the summer occurs in the summer corn growth season (6-9), the gap moisture of more than 400mm exists in the winter wheat growth season, a large amount of groundwater needs to be supplemented, and the water level is also the main reason for continuously reducing the local groundwater.
2. Test materials: and (3) testing fertilizers: n, P diammonium phosphate 18% and 46%, urea 46% in N content, and potassium sulfate 50% in K content
3. Pesticide to be tested: soybean pesticide: chlorfenapyr, lufenuron; wheat pesticide: acetamiprid, dichlorvos, azoxystrobin and florasulam; corn pesticide: dichlorphos and pendimethalin.
4. And (3) trial article species: semen glycines (Jidou No. 4), winter wheat (neolitha 633), and summer semen Maydis (Earth 916)
2. Planting method
Spring soybean → winter wheat-summer corn two-year-three-cropping rotation mode
Sowing soybeans in about 26 days after 4 months, wherein the soybean seeds are sowed with 375kg/hm & lt 2 & gt of base fertilizer diammonium phosphate, 300kg/hm & lt 2 & gt of potassium sulfate and 180kg/hm & lt 2 & gt of urea, ploughing and leveling the soybean seeds, irrigating before sowing, wherein the irrigation amount is 75mm, and the soybeans are sowed in holes with 4-5 grains per hole, the hole depth is about 3cm, the hole distance is 25-27 cm, and the row spacing is 45cm.
Irrigating soybean for about 5 months and 31 days for 75mm.
The anthelmintic chlorfenapyr and lufenuron are applied for about 6 months and 25 days, and the application amount is 600ml/hm 2 And (4) repeatedly spraying about 7 months and 2 days after one week to prevent insect damage.
Harvesting spring soybeans in about 9 months and 12 days, reserving stubbles on the ground surface for 5-6 cm, harvesting overground parts, and ploughing the stubbles and root systems of the underground parts in soil before sowing next-stubble winter wheat to form humus to provide nutrients for next-stubble crops.
Sowing winter wheat in about 10-11 days, dressing seeds with phoxim before sowing, using 375kg/hm & lt 2 & gt of diammonium phosphate as a base fertilizer and 3.3kg/hm & lt 2 & gt of urea, turning over the ground after fertilization, and mechanically sowing the winter wheat in rows with a row spacing of 20cm.
The winter wheat is irrigated with 75mm of overwintering water in about 11 months and 20 days.
20 days in the next 3 months, the herbicide florasulam(s)According to 4.5g/hm 2 Dilution).
Applying 416.7kg/hm urea after 3 months and 30 days 2 And irrigating 75mm.
Spraying pesticide (mixture of anthelmintic dichlorvos and acetamiprid at 2.25 kg/hm) on winter wheat ear for 5 months and 22 days 2 (ii) a Azoxystrobin serving as a disease-preventing drug is diluted by 1300-1500 times) to prevent and treat winter wheat aphids, rust diseases, powdery mildew and the like.
Wheat was irrigated 5 months and 17 days in winter, 75mm.
The winter wheat is harvested in about 6 months and 8 days by a machine, stubble is left for 18-20 cm, the straws are crushed to cover the ground surface and returned to the field, the content of organic matters in a farmland soil plough layer and effective nutrients such as N, P and the like is improved, and further, the organic fertilizer can replace part of inorganic fertilizers and is beneficial to fertilizing soil fertility.
Sowing summer corns in about 11 days in 6 months, and sowing 1 seed/hole in a machine, wherein the hole distance is 28cm, and the line distance is 45cm.
Corn is irrigated for 75mm in 6 months and 17 days in summer.
Spraying pendimethalin (diluted by 150 times) and chlormephos (diluted by 1000 times) as herbicide on summer corns in 6 months and 25 days.
Topdressing urea 616.7kg/hm for 7-month 26-day summer corn 2 And (5) supplementing and irrigating 75mm.
Harvesting summer corns in about 9 months and 30 days, and entering the next crop rotation period.
In the test, a winter wheat-summer corn one-year-two-harvest mode is set as a control group, and the planting mode is the same as that of the control group.
3. Results and analysis of the experiments
TABLE 1 comparison of annual water consumption, economic benefit, carbon footprint for the grain and bean model and the wheat and jade model
Figure 440426DEST_PATH_IMAGE001
The experimental results in table 1 show that, compared with the traditional wheat-jade mode, the spring soybean → winter wheat-summer corn rotation mode can reduce annual water consumption by 24%, relieve the drop of groundwater level by 42%, reduce the emission of farmland clean greenhouse gases by 29%, improve annual economic benefits by 4.6%, and improve economic water utilization efficiency by 33.6%. Meanwhile, the investment of nitrogen fertilizer and irrigation is reduced, the content of high-quality protein of the system is increased, and the planting structure and the dietary structure of the area are optimized.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (5)

1. The soybean, wheat and corn crop rotation planting method is characterized by comprising the following steps:
step 1: fertilizing and preparing soil in spring of the year, and sowing soybeans between 10 and 30 days after 4 months;
step 2: fertilizing and preparing the harvested soybean stubble in the step 1, and sowing wheat between 1 and 15 days of 10 months;
and step 3: after the wheat in the step 2 is mature, the wheat straws are crushed and no-tillage covering and returning to the field after stubble harvesting, and then corn is sowed;
and 4, step 4: after the corns are harvested, repeating the step 1, the step 2 and the step 3;
adding a soybean base fertilizer before sowing soybeans, wherein the soybean base fertilizer is diammonium phosphate, potassium sulfate and urea, and the adding amount of the diammonium phosphate is 375kg/hm 2 The application amount of the potassium sulfate is 300kg/hm 2 The application amount of the urea is 180kg/hm 2 Applying a wheat base fertilizer before wheat sowing, wherein the wheat base fertilizer is diammonium phosphate and urea, and the application amount of the diammonium phosphate is 375kg/hm 2 The application amount of the urea is 3.3kg/hm 2 Topdressing is carried out in the jointing stage of the wheat, and the application amount of the topdressing of the wheat is 416.7kg/hm 2 The soybean is sowed in a hole sowing mode, the hole depth is 3-5 cm, the hole distance is 25-27 cm, the row spacing is 30-45 cm, the wheat is sowed in a machine-ploughed row, the sowing row spacing of the wheat is 15-25 cm, the corn is sowed in a hole, the sowing row spacing of the corn is 40-50 cm, 1 or 2 seeds are arranged in each sowing hole, the sowing hole spacing of the corn is 25-30 cm, the stubble height of the wheat is 15-25 cm, the root system of the soybean is kept in soil after the soybean is harvested, and the stubble height of the soybean is 5-6 cm.
2. The soybean, wheat and corn crop rotation planting method as claimed in claim 1, wherein the wheat is not irrigated during sowing, and the wheat is irrigated in winter before winter, wherein the irrigation amount of the winter is 60-80 mm.
3. The soybean, wheat and corn crop rotation planting method as claimed in claim 2, characterized in that seeding irrigation is carried out when the corn is sowed, the irrigation amount of the seeding irrigation is 60-80 mm, irrigation is carried out in the corn jointing stage, the irrigation amount of the corn jointing stage is 60-80 mm, and top dressing is carried out in the corn jointing stage, and the top dressing application amount of the corn is 616.7kg/hm 2 And the soybean is irrigated in the sowing process, and the irrigation amount is 60-80 mm.
4. The soybean, wheat and corn crop rotation planting method as claimed in claim 1, wherein the soybeans are subjected to insect repellent treatment with an insect repellent at an interval of 5-7 days in the flowering period of the soybeans, and the application amount of the insect repellent is 600ml/hm 2
5. The soybean, wheat and corn rotation planting method as claimed in claim 4, characterized in that 100-200 times of pendimethalin is used for weeding in the ear sprouting period of the corn, and/or 800-1500 times of chlorthalon is used for in-out insect prevention treatment, 1300-1500 times of anthelmintic is used in the jointing period of the wheat, and/or 1300-1500 times of disease prevention drug is used for spraying on the wheat 5-7 days apart.
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