CN111587621A - Novel strawberry straw returning method - Google Patents
Novel strawberry straw returning method Download PDFInfo
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- CN111587621A CN111587621A CN202010490840.6A CN202010490840A CN111587621A CN 111587621 A CN111587621 A CN 111587621A CN 202010490840 A CN202010490840 A CN 202010490840A CN 111587621 A CN111587621 A CN 111587621A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/04—Heat
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
- A61L2/22—Phase substances, e.g. smokes, aerosols or sprayed or atomised substances
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Abstract
The invention relates to the technical field of crop application, in particular to a novel strawberry straw returning method, which comprises the following steps: 1) processing strawberry plants in a greenhouse; 2) carrying out rotary tillage on soil for the first time; 3) spraying calcium cyanamide aqueous solution disinfectant by micro-spraying; 4) disinfecting soil by solar high-temperature shed-closing; 5) and (4) carrying out secondary rotary tillage on soil, sterilizing and disinfecting by flame at high temperature, and covering the greenhouse with solar energy at high temperature for 5-8 days to wait for sowing of next-stubble crops. The strawberry straw returning method provided by the invention can effectively improve the yield of strawberries, does not reduce the organic matter content of soil, but shows a rising trend, and shows that the strawberry living bodies are crushed and stirred in the soil, the organic matter content and partial trace elements of the soil are improved, the granular structure of the soil is improved and increased, and a clean mechanism and ecological cycle are realized in the production of strawberries.
Description
Technical Field
The invention relates to the technical field of crop application, in particular to a novel strawberry straw returning method.
Background
Strawberries, also called yacon, are Rosaceae, strawberry plants are short, grow in clusters, and the fruits are polymerized lean fruits. Strawberry has various varieties, including more than 2000 varieties, bright red and beautiful fruits, softness and juiciness, pleasant sweetness and sourness, strong fragrance and reputation of fruit queen. The history of strawberry cultivation in China is more than 100 years, the cultivation form is mainly based on the protected area and is assisted by the open field production. It is heart-shaped, delicious, red and tender, juicy, sour, sweet and delicious, and has rich fragrance, not only color, but also pleasant fragrance that general fruits do not have, and is a good choice of color, fragrance and taste in fruits. The strawberry cultivation has the characteristics of short cultivation fruiting period, long fruiting period, small plants, quick propagation, high economic benefit and the like, so the strawberry cultivation is deeply loved by producers and consumers, and the rapid development of the strawberries has wide prospects. Researches show that the soil micro-ecological environment for planting strawberry farmlands is favorable for the proliferation of fungi and is unfavorable for bacteria and actinomycetes. Due to the rapid development of agricultural facilities and the aggravation of soil-borne diseases and insect pests, serious continuous cropping obstacles of soil and deterioration of the ecological environment of the soil caused by overhigh multiple cropping index, the method is very necessary for the soil treatment of strawberry-planting farmlands.
The traditional soil treatment mode has two kinds, respectively: (1) manual pulling method of strawberry plants after the end of strawberry production season: in the last 6 th month each year, after the strawberry fruiting period is over, strawberry growers firstly water and then clear mulching films, then manually shovel or pull out seedlings, finally naturally air-cure the soil in the strawberry plant shed or move the strawberry plant shed out of the shed for air-curing in the open air, and burn out the strawberry plant shed in a centralized manner after half a month; (2) chemical disinfection and plant killing method after the end of strawberry production season: namely, in the last 6 months of each year, after the strawberry fruiting period is finished, the chemical disinfectant is dripped into the positions near the plant roots on the furrow through the dropper to kill the strawberry plants quickly, and the dead strawberry plants are burnt out in a centralized manner after half a month. The above two treatment methods have the following disadvantages: the strawberry straw burning pollutes the environment, is beneficial to spreading diseases and pests, and has large labor amount. If the straw is not burnt, the straw can become a source of infection of plant diseases and insect pests.
Disclosure of Invention
The invention aims to overcome the technical problems and provides a novel strawberry straw returning method, so that the strawberry straws are recycled, the living bodies of strawberry plants and weeds among ridges can be crushed and harmlessly, and the bad habit of messy stacking and random placing of cleaned strawberry plant residues in strawberry production is changed; the greenhouse soil of continuous cropping in successive years is disinfected by using the condition of facility cultivation, so that the soil is recovered to a healthy state suitable for the growth of crops while effectively killing soil nematodes and pathogenic microorganisms.
The technical scheme for solving the technical problems is as follows:
a novel strawberry straw returning method comprises the following steps:
1) greenhouse strawberry plant treatment
After the strawberry fruit is harvested, removing a plastic film covered by the sunlight greenhouse, supplying water by using a field dropper to enable the water content of the ground soil to reach 75-85%, moving a field drip irrigation tape to the ground of the greenhouse, timely cleaning a mulching film and field sundries, and airing for at least 24 hours;
2) soil with one rotary tillage
Opening the air port of the greenhouse, using a tractor with horsepower not less than 55 horsepower to pull a rotary cultivator to turn the strawberry straws into a plough layer, and raking the straws; controlling the speed of the rotary cultivator to be 30-50 min/mu, continuously carrying out rotary tillage for a plurality of times, and completely contacting a cutter head of the rotary cultivator with the ground in the rotary tillage process to ensure that leaves and roots of the strawberries are crushed, the strawberry straws and the soil are uniformly mixed and stirred, and the length of the strawberry straws on the ground after rotary tillage is not more than 10 cm;
3) spraying disinfectant by micro-spraying
Uniformly paving micro-spraying belts on the ground of the rotary-tilled greenhouse, conveying the calcium cyanamide aqueous solution prepared in advance to the field from the liquid medicine pool by the micro-spraying belts through pressure, and uniformly spraying the calcium cyanamide aqueous solution to the field through water outlets on the micro-spraying belts;
4) disinfecting soil
After spraying the disinfectant, covering and sealing the ground by using plastic cloth, closing the air port of the greenhouse, and daily sealing the greenhouse for 10-15 days by using solar energy at high temperature;
5) secondary rotary tillage soil
Removing the plastic cloth, carrying out secondary rotary tillage on the soil, carrying out deep tillage on the soil by a deep tillage machine for 35-40cm, carrying out disinfection and insect killing by a flame high-temperature disinfection and sterilization insect killing machine in the deep tillage process, wherein the soil fire passing time is 3-5s, the soil falling temperature is 50-70 ℃, and the next crop sowing can be waited by adopting daily solar high-temperature shed closing for 5-8 days.
Further, the soil temperature of the field dropper in the step 1) is 14-16 ℃ when water is supplied to the field dropper.
Further, in order to prevent the calcium cyanamide aqueous solution from accumulating in the micro-spraying zone to block the micro-spraying zone, the calcium cyanamide aqueous solution in the step 3) is sprayed for 10-15 min by adopting clean water after being sprayed.
Further, the spraying amount of the calcium cyanamide aqueous solution in the step 3) is that 60 kilograms of solid calcium cyanamide is mixed with 40 kilograms of clear water mixed liquor per mu.
Further, the solid calcium cyanamide is powder or granules.
Furthermore, the content of the cyanamide as the intermediate product of the decomposition of the solid calcium cyanamide is not less than 70 percent.
Further, during soil disinfection in the step 4), the ground and the rear wall surface which cannot be covered are supplemented with the calcium cyanamide aqueous solution in time.
Further, the soil falling temperature in the step 5) is 63-66 ℃.
More specifically, the disinfection and disinsection by using the flame high-temperature disinfection and sterilization disinsection machine in the step 5) is to heat soil with the depth of less than 30cm by burning liquefied gas.
The invention has the beneficial effects that:
the invention provides a novel strawberry straw returning method, which can realize resource utilization of strawberry straws, crush and innocent treatment of strawberry plant living bodies and weed among ridges, and change the bad habit of disordered stacking and random placement of cleaned strawberry plant residues in strawberry production; the greenhouse soil of continuous cropping in successive years is disinfected by using the condition of facility cultivation, so that the soil is recovered to a healthy state suitable for the growth of crops while effectively killing soil nematodes and pathogenic microorganisms. The strawberry living bodies are crushed and stirred in the soil, the organic matter content and partial trace elements of the soil are improved, the granular structure of the soil is improved and increased, and the clean mechanism and ecological cycle of the strawberry production are realized.
The method combines calcium cyanamide disinfection and flame high-temperature soil disinfection to sterilize the strawberry straw returning soil, and the sterilization efficiency is greatly improved. The calcium cyanamide is a high-efficiency soil disinfectant, the intermediate products of decomposition of the calcium cyanamide and the dicyandiamide have the effects of disinfection, deinsectization and disease prevention, and the calcium cyanamide has the characteristics of low toxicity, no public hazard, no residue and the like, can effectively inhibit and kill root-knot nematodes, clubroots and other soil-borne diseases in soil, eliminate monocotyledonous weeds and eliminate underground pests. The soil after being disinfected by calcium cyanamide is matched with daily solar high-temperature greenhouse closing, so that the killing of root-knot nematodes and other pathogenic microorganisms is further improved. And a flame high-temperature soil disinfection method is further adopted, when the rotary cultivator carries out rotary tillage on soil, a row of flame spray pipes spray flames to instantly heat the soil in the rising process of the soil, and a row of flame spray pipes spray flames to secondarily heat the soil in the falling process of the soil, so that the instant temperature of 1000 ℃ can be maintained for 2-3s in the soil disinfection process, germs and pathogenic microorganisms which cannot be completely killed by calcium cyanamide are further killed through the high temperature, meanwhile, the solar high-temperature greenhouse is combined, and the greenhouse is matched with microorganism prevention and control after being closed, so that root-knot nematodes and other pathogenic microorganisms can be stored everywhere, and the optimal prevention and control effect is achieved.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1:
a novel strawberry straw returning method comprises the following steps:
1) greenhouse strawberry plant treatment
After the harvesting of the strawberry fruits is finished, a plastic film covered by the sunlight greenhouse is not removed, a field dropper is used for supplying water to enable the water content of the ground soil to reach 80%, a field drip irrigation tape is moved to the edge of the greenhouse, mulching films and field sundries are cleaned in time, and the strawberry fruits are aired for 24 hours; when the field dropper feeds water, the soil temperature is 15 ℃.
2) Soil with one rotary tillage
Opening the air port of the greenhouse, using a tractor with horsepower not less than 55 horsepower to pull a rotary cultivator to turn the strawberry straws into a plough layer, and raking the straws; controlling the speed of the rotary cultivator to be 40 min/mu, continuously carrying out rotary tillage for a plurality of times, and completely contacting a cutter head of the rotary cultivator with the ground in the rotary tillage process to crush strawberry leaves and roots, uniformly mixing strawberry straws and soil, and ensuring that the length of the strawberry straws on the ground after rotary tillage is not more than 10 cm;
3) spraying disinfectant by micro-spraying
Uniformly paving micro-spraying belts on the ground of the rotary-tilled greenhouse, conveying the calcium cyanamide aqueous solution prepared in advance to the field from the liquid medicine pool by the micro-spraying belts through pressure, and uniformly spraying the calcium cyanamide aqueous solution to the field through water outlets on the micro-spraying belts; after the calcium cyanamide aqueous solution is sprayed, the calcium cyanamide aqueous solution is sprayed for 15min by adopting clear water. The spraying amount of the calcium cyanamide aqueous solution is that 60 kilograms of solid calcium cyanamide is mixed with 40 kilograms of clear water mixed liquor per mu. The solid calcium cyanamide is a powder. The intermediate product cyanamide content of the solid calcium cyanamide decomposition is 75%.
4) Disinfecting soil
After spraying the disinfectant, covering and sealing the ground by using plastic cloth, closing the air port of the greenhouse, and daily sealing the greenhouse for 15 days by using solar energy at high temperature; and (3) timely supplementing and spraying calcium cyanamide aqueous solution to the ground and the rear wall surface which can not be covered.
5) Secondary rotary tillage soil
Removing the plastic cloth, carrying out secondary rotary tillage on the soil, carrying out deep tillage on the soil by using a deep tillage machine for 35-40cm, carrying out disinfection and insect killing by using a flame high-temperature disinfection and sterilization insect killing machine in the deep tillage process, wherein the soil fire passing time is 3-5s, the soil falling temperature is 63-66 ℃, and the next crop can be sown by using daily solar high-temperature greenhouse closing for 8 days.
The high-temp. flame disinfecting and sterilizing machine is used to disinfect and kill pests by burning liquefied gas to heat soil whose depth is less than 30 cm.
Example 2:
a novel strawberry straw returning method comprises the following steps:
1) greenhouse strawberry plant treatment
After the harvesting of the strawberry fruits is finished, a plastic film covered by the sunlight greenhouse is not removed, a field dropper is used for supplying water to enable the water content of the ground soil to reach 75%, a field drip irrigation tape is moved to the edge of the greenhouse, mulching films and field sundries are cleaned in time, and the strawberry fruits are aired for 30 hours; when the field dropper feeds water, the soil temperature is 14 ℃.
2) Soil with one rotary tillage
Opening the air port of the greenhouse, using a tractor with horsepower not less than 55 horsepower to pull a rotary cultivator to turn the strawberry straws into a plough layer, and raking the straws; controlling the speed of the rotary cultivator to be 30 min/mu, continuously carrying out rotary tillage for a plurality of times, and completely contacting a cutter head of the rotary cultivator with the ground in the rotary tillage process to crush strawberry leaves and roots, uniformly mixing strawberry straws and soil, and ensuring that the length of the strawberry straws on the ground after rotary tillage is not more than 10 cm;
3) spraying disinfectant by micro-spraying
Uniformly paving micro-spraying belts on the ground of the rotary-tilled greenhouse, conveying the calcium cyanamide aqueous solution prepared in advance to the field from the liquid medicine pool by the micro-spraying belts through pressure, and uniformly spraying the calcium cyanamide aqueous solution to the field through water outlets on the micro-spraying belts; after the calcium cyanamide aqueous solution is sprayed, the calcium cyanamide aqueous solution is sprayed for 10min by adopting clear water. The spraying amount of the calcium cyanamide aqueous solution is that 60 kilograms of solid calcium cyanamide is mixed with 40 kilograms of clear water mixed liquor per mu.
The solid calcium cyanamide is in the form of granules. The intermediate product cyanamide content of the solid calcium cyanamide decomposition is 70%.
4) Disinfecting soil
After spraying the disinfectant, covering and sealing the ground by using plastic cloth, closing the air port of the greenhouse, and daily closing the greenhouse for 10 days by using solar energy at high temperature; and (3) timely supplementing and spraying calcium cyanamide aqueous solution to the ground and the rear wall surface which can not be covered.
5) Secondary rotary tillage soil
Removing the plastic cloth, carrying out secondary rotary tillage on the soil, carrying out deep tillage on the soil by using a deep tillage machine for 35-40cm, carrying out disinfection and insect killing by using a flame high-temperature disinfection and sterilization insect killing machine in the deep tillage process, wherein the soil fire passing time is 3-5s, the soil falling temperature is 70 ℃, and the next crop can be sown by using daily solar high-temperature greenhouse closing for 5 days.
The high-temp. flame disinfecting and sterilizing machine is used to disinfect and kill pests by burning liquefied gas to heat soil whose depth is less than 30 cm.
Example 3:
a novel strawberry straw returning method comprises the following steps:
1) greenhouse strawberry plant treatment
After the harvesting of the strawberry fruits is finished, a plastic film covered by the sunlight greenhouse is not removed, a field dropper is used for supplying water to enable the water content of the ground soil to reach 85%, a field drip irrigation tape is moved to the edge of the greenhouse, mulching films and field sundries are cleaned in time, and the strawberry fruits are aired for 28 hours; when the field dropper feeds water, the soil temperature is 16 ℃.
2) Soil with one rotary tillage
Opening the air port of the greenhouse, using a tractor with horsepower not less than 55 horsepower to pull a rotary cultivator to turn the strawberry straws into a plough layer, and raking the straws; controlling the speed of the rotary cultivator to be 50 min/mu, continuously carrying out rotary tillage for a plurality of times, and completely contacting a cutter head of the rotary cultivator with the ground in the rotary tillage process to crush strawberry leaves and roots, uniformly mixing strawberry straws and soil, and ensuring that the length of the strawberry straws on the ground after rotary tillage is not more than 10 cm;
3) spraying disinfectant by micro-spraying
Uniformly paving micro-spraying belts on the ground of the rotary-tilled greenhouse, conveying the calcium cyanamide aqueous solution prepared in advance to the field from the liquid medicine pool by the micro-spraying belts through pressure, and uniformly spraying the calcium cyanamide aqueous solution to the field through water outlets on the micro-spraying belts; and after the calcium cyanamide aqueous solution is sprayed, carrying out micro-spraying for 13min by using clear water. The spraying amount of the calcium cyanamide aqueous solution is that 60 kilograms of solid calcium cyanamide is mixed with 40 kilograms of clear water mixed liquor per mu.
The solid calcium cyanamide is a powder. The content of the cyanamide as the intermediate product of the decomposition of the solid calcium cyanamide is not less than 78 percent.
4) Disinfecting soil
After spraying the disinfectant, covering and sealing the ground by using plastic cloth, closing the air port of the greenhouse, and daily closing the greenhouse for 13 days by using solar energy at high temperature; and (3) timely supplementing and spraying calcium cyanamide aqueous solution to the ground and the rear wall surface which can not be covered.
5) Secondary rotary tillage soil
Removing the plastic cloth, carrying out secondary rotary tillage on the soil, carrying out deep tillage on the soil by using a deep tillage machine for 35-40cm, carrying out disinfection and insect killing by using a flame high-temperature disinfection and sterilization insect killing machine in the deep tillage process, wherein the soil fire passing time is 3-5s, the soil falling temperature is 50 ℃, and the next crop can be sown by using daily solar high-temperature greenhouse closing for 6 days.
The high-temp. flame disinfecting and sterilizing machine is used to disinfect and kill pests by burning liquefied gas to heat soil whose depth is less than 30 cm.
Comparative example 1:
the soil was disinfected with calcium cyanamide aqueous solution alone, and the soil was disinfected at high temperature without using flame, and the other steps were the same as in example 1.
Comparative example 2:
the method is the same as example 1 except that flame is used alone to sterilize the soil at high temperature and calcium cyanamide aqueous solution is not used to sterilize the soil.
Dividing one test field into 5 areas on average, performing strawberry field returning operation on the test fields 1, 2, 3, 4 and 5 in a mode of examples 1, 2 and 3 respectively, performing strawberry field returning operation on the test fields 1, 2 and 3 in a mode of comparative examples 1 and 2 respectively, then planting the same variety of strawberries in 5 test fields, wherein except for the different operation conditions, the rest field management modes such as fertilization, water application and the like are completely the same, and the yield of the harvested strawberries and the organic matter content of soil in the field of the harvested strawberries are respectively measured, wherein the organic matter content of the soil is measured by a potassium dichromate volumetric method-external heating method, and the test results are shown in the following table 1:
TABLE 1 strawberry returning method Effect test of examples 1-3, comparative examples 1-2
| Serial number | Test field | Organic matter content, g/kg | Strawberry yield, kg/mu |
| Example 1 | 1 | 27.7 | 2920 |
| Example 2 | 2 | 25.6 | 2780 |
| Example 3 | 3 | 23.8 | 2850 |
| Comparative example 1 | 4 | 20.6 | 2090 |
| Comparative example 2 | 5 | 21.7 | 2240 |
As can be seen from Table 1, the strawberry straw returning method provided by the invention can effectively increase the yield of strawberries, shows that the killing rate of soil nematodes and pathogenic microorganisms in soil is high, the organic matter content of soil is not reduced, but the rising trend is shown, shows that the strawberry living bodies are crushed and stirred in the soil, the organic matter content and partial trace elements of the soil are increased, the granular structure of the soil is improved and increased, and the clean mechanism and ecological cycle of strawberry production are realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.
Claims (9)
1. A novel strawberry straw returning method is characterized by comprising the following steps:
1) greenhouse strawberry plant treatment
After the strawberry fruit is harvested, removing a plastic film covered by the sunlight greenhouse, supplying water by using a field dropper to enable the water content of the ground soil to reach 75-85%, moving a field drip irrigation tape to the ground of the greenhouse, timely cleaning a mulching film and field sundries, and airing for at least 24 hours;
2) soil with one rotary tillage
Opening the air port of the greenhouse, using a tractor with horsepower not less than 55 horsepower to pull a rotary cultivator to turn the strawberry straws into a plough layer, and raking the straws; controlling the speed of the rotary cultivator to be 30-50 min/mu, continuously carrying out rotary tillage for a plurality of times, and completely contacting a cutter head of the rotary cultivator with the ground in the rotary tillage process to ensure that leaves and roots of the strawberries are crushed, the strawberry straws and the soil are uniformly mixed and stirred, and the length of the strawberry straws on the ground after rotary tillage is not more than 10 cm;
3) spraying disinfectant by micro-spraying
Uniformly paving micro-spraying belts on the ground of the rotary-tilled greenhouse, conveying the calcium cyanamide aqueous solution prepared in advance to the field from the liquid medicine pool by the micro-spraying belts through pressure, and uniformly spraying the calcium cyanamide aqueous solution to the field through water outlets on the micro-spraying belts;
4) disinfecting soil
After spraying the calcium cyanamide aqueous solution disinfectant, covering and sealing the ground by using plastic cloth, closing the air port of the greenhouse, and daily sealing the greenhouse for 10-15 days by using solar energy at high temperature;
5) secondary rotary tillage soil
Removing the plastic cloth, carrying out secondary rotary tillage on the soil, carrying out deep tillage on the soil by a deep tillage machine for 35-40cm, carrying out disinfection and insect killing by a flame high-temperature disinfection and sterilization insect killing machine in the deep tillage process, wherein the soil fire passing time is 3-5s, the soil falling temperature is 50-70 ℃, and the next crop sowing can be waited by adopting daily solar high-temperature shed closing for 5-8 days.
2. The novel strawberry straw returning method as claimed in claim 1, wherein the soil temperature of the field dropper in the step 1) is 14-16 ℃ when water is supplied to the field dropper.
3. The novel strawberry straw returning method of claim 1, wherein after the calcium cyanamide aqueous solution in step 3) is sprayed, the calcium cyanamide aqueous solution is sprayed with clear water for 10-15 min.
4. The novel strawberry straw returning method of claim 1, wherein the spraying amount of the aqueous solution of calcium cyanamide in the step 3) is 60 kg of solid calcium cyanamide per mu and 40 kg of clear water.
5. The novel strawberry straw returning method of claim 4, wherein the solid calcium cyanamide is in the form of powder or granules.
6. The new strawberry straw returning method as claimed in claim 4, wherein the content of cyanamide as the intermediate product of the decomposition of solid calcium cyanamide is not less than 70%.
7. The novel strawberry straw returning method of claim 1, wherein the spraying of the aqueous solution of calcium cyanamide is supplemented to the ground and the rear wall surface which cannot be covered in the step 4) in time during the soil disinfection.
8. The novel strawberry straw returning method of claim 1, wherein the temperature of the soil falling to the ground in the step 5) is 63-66 ℃.
9. The method for returning strawberry straws to a field as claimed in claim 1, wherein the step 5) of sterilizing and killing pests by using a flame high-temperature sterilizing and disinfecting and killing pest machine is to heat soil with a depth of less than 30cm by using combustion liquefied gas.
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