Ecological mulching film laying method

Abstract

The invention provides a laying method of an ecological mulching film, and belongs to the technical field of ecological agriculture. The invention provides a laying method of an ecological mulching film. The laying method comprises the following steps: preparing a soybean urease solution; adding an additive to obtain a soybean urease mixed solution; preparing a salt solution of urea and calcium chloride; preparing an in-situ soil mixture; mixing the soybean urease mixed solution with the salt solution to obtain a cementing solution, adding the cementing solution into an in-situ soil mixture, paving the mixture on a field, and drying to obtain the ecological mulching film. The ecological mulching film based on the SICP technology is more effective in heat preservation and moisture preservation of soil, convenient to construct and free of pollution to the environment, and meets the requirements for plant growth and green and sustainable development.

Description

Technical Field

[0001] The invention relates to the technical field of ecological agriculture, and in particular to a method for laying an ecological mulch film. Background Art

[0002] As the global climate continues to change, the call for green environmental protection is getting louder and louder. In the process of planting crops, agriculture, which belongs to the primary industry, needs to use a large amount of mulch to help the soil keep warm and moist, thereby promoting plant growth. Most of the mulch currently used is plastic mulch, and the pollution to the environment cannot be ignored.

[0003] The mulch film covers the surface of the field and reserves small holes for plant growth. However, after the crops are harvested, the mulch film is very difficult to deal with. On the one hand, the growing plants will break the mulch film. Under the long-term wind, sun and human influence, the mulch film breaks into small pieces and distributes in the soil. If it is not recycled, it will cause a certain degree of harm to the soil environment, such as affecting the penetration of soil moisture and the air permeability of the soil; hindering the movement of water and fertilizer in the soil; and soil compaction. It leads to slow crop emergence, low emergence rate, missing seedlings and broken ridges; it is not conducive to the rooting and germination of crops, resulting in difficulty in the growth and development of the crop root system; the residual film fragments may be mixed with crop straw and feed, and cattle, sheep and other livestock may suffer from gastrointestinal dysfunction or even death after accidentally ingesting them.

[0004] In recent years, microbial technology based on soybean urease-induced calcium carbonate precipitation has achieved good results in the agricultural field. In order to solve the problem that plastic mulch causes environmental pollution, but not using mulch will reduce crop yields, a green and environmentally friendly mulch is proposed to promote the growth of crops while achieving green and environmental protection. Summary of the invention

[0005] The purpose of the present invention is to provide a method for laying an ecological mulch film, which can not only promote plant growth but also meet green and environmental protection standards.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a method for laying an ecological mulch film, comprising the following steps:

[0008] (1) preparing soybean urease solution;

[0009] (2) adding additives to obtain a soybean urease mixed solution;

[0010] (3) preparing a salt solution of urea and calcium chloride;

[0011] (4) preparing an in-situ soil mixture;

[0012] (5) The soybean urease mixed solution and the salt solution are mixed to obtain a binder, which is added to an in-situ soil mixture and spread on a field. After drying, the binder obtains the ecological mulch film.

[0013] Preferably, the soybean urease solution in step (1) is prepared by mixing 30-40 mesh soybean powder with water to a concentration of 35-45 g / L, stirring, passing through a 0.01-0.03 mm sieve, and centrifuging to obtain the supernatant to obtain the soybean urease solution.

[0014] Preferably, the additives in step (2) and their added concentrations in the soybean urease solution are: 2.5-3.5 g / L xanthan gum, 4.5-5.5 g / L skimmed milk powder, 5.5-6.5 g / L magnesium chloride, 5.5-6.5 g / L sodium alginate, 4.5-5.5 g / L lignin, and 5.5-6.5 g / L sorbitol.

[0015] Preferably, the molar concentration ratio of urea and calcium chloride in step (3) is 1-2:1-2, and the volume ratio thereof is 1-2:1-2.

[0016] Preferably, the in-situ soil mixture in step (4) is prepared by adding two or three of the following in-situ soil additives to the in-situ soil according to the in-situ soil area: 90-110 g / m 2 Plant fiber with single fiber fineness of 30μm-100μm, 40-160g / m 2 Bone meal, 180-220g / m 2 The plant fiber comprises one or more of flax, ramie, jute and bamboo fiber.

[0017] Preferably, in step (5), the volume ratio of the soybean urease mixed solution to the salt solution is 1-2:1-2, and the binder and the in-situ soil are mixed in a volume ratio of 1-2:4-5.

[0018] Preferably, the paving thickness in step (5) is 3-5 cm, and the in-situ soil is taken in-situ according to the paving thickness.

[0019] The present invention uses soybean urease solution and salt solution to mix evenly on site to obtain a cementing liquid, and then mixes the cementing liquid with the in-situ soil in the field, and evenly spreads it on each ridge after sowing. After being fully dried, a soybean urease cementing layer is generated on the surface of the field. The cementing layer has the functions of increasing soil temperature, maintaining soil moisture, maintaining soil structure and promoting plant growth. Compared with the commonly used plastic mulch, the ecological mulch based on SICP technology provided by the present invention is more effective in soil heat preservation and moisture retention, and is easy to construct, has no pollution to the environment, and meets the requirements of plant growth and green sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 To measure the effect of the mulch films on soil temperature in Example 1 and Comparative Examples 1-11;

[0021] Figure 2 The results are for determining the effects of the mulch films of Example 1 and Comparative Examples 1-11 on soil moisture content. DETAILED DESCRIPTION

[0022] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0023] Example 1

[0024] Prepare soybean urease solution. After grinding soybeans into soybean powder and passing through a 35-mesh sieve, prepare soybean solution with deionized water at a concentration of 40g / L. Stir the prepared solution manually for 5 minutes, pass through a 0.02mm sieve, and centrifuge the sieved solution at a speed of 3000 rpm for 5 minutes. Take the supernatant to prepare soybean urease solution. Then add xanthan gum with a final concentration of 3g / L, 5g / L skim milk powder, 6g / L magnesium chloride, 6g / L sodium alginate, 5g / L lignin, and 6g / L sorbitol as additives to the 40g / L soybean urease solution.

[0025] 1 mol / L urea and 1 mol / L calcium chloride solution were fully mixed in a volume ratio of 1:1 to form a salt solution.

[0026] Prepare the in-situ soil on site, lay three centimeters of ecological mulch per square meter, and add 100g / m 2 The commercially available single fiber fineness is 100μm to 30μm. Ramie , 150g / m 2 Animal bone meal, 200g / m 2 The wood ash generated after the wood or plants are burned is used as an additive. The ratio of the additive to the original soil is 2:10, and it is added to the mixer and fully mixed.

[0027] The soybean urease solution with additives and the salt solution were mixed in a volume ratio of 1:1 to prepare a cementing liquid. According to the standard of cementing liquid: in-situ soil = 1:4, the cementing liquid was added to the in-situ soil and stirred for 15 minutes using a mixer.

[0028] After being fully mixed, evenly spread the ecological mulch film on each ridge of the field at a thickness of three centimeters per square meter, and then dry it thoroughly.

[0029] Comparative Example 1

[0030] In this control group, no additives were added to the soybean urease solution, and other aspects were exactly the same as those in Example 1.

[0031] Comparative Example 2

[0032] In this control group, 5 g / L skim milk powder, 6 g / L magnesium chloride, 6 g / L sodium alginate, 5 g / L lignin, and 6 g / L sorbitol were added as additives to the soybean urease solution, and other aspects were exactly the same as those in Example 1.

[0033] Comparative Example 3

[0034] In this control group, 3 g / L xanthan gum, 6 g / L magnesium chloride, 6 g / L sodium alginate, 5 g / L lignin, and 6 g / L sorbitol were added as additives to the soybean urease solution, and the rest was exactly the same as in Example 1.

[0035] Comparative Example 4

[0036] In this control group, 3 g / L xanthan gum, 5 g / L skim milk powder, 5 g / L lignin, and 6 g / L sorbitol were added as additives to the soybean urease solution, and the rest was exactly the same as in Example 1.

[0037] Comparative Example 5

[0038] In this control group, 3 g / L xanthan gum, 5 g / L skim milk powder, 6 g / L magnesium chloride, 6 g / L sodium alginate, and 6 g / L sorbitol were added as additives to the soybean urease solution, and the rest was exactly the same as in Example 1.

[0039] Comparative Example 6

[0040] In this control group, 3 g / L xanthan gum, 5 g / L skimmed milk powder, 6 g / L magnesium chloride, 6 g / L sodium alginate, and 5 g / L lignin were added to the soybean urease solution as additives, and the rest was exactly the same as in Example 1.

[0041] Comparative Example 7

[0042] This example uses the same method as in Example 1 to prepare the soybean urease binder solution, and adds 3g / L xanthan gum, 5g / L skim milk powder, 6g / L magnesium chloride, 6g / L sodium alginate, 5g / L lignin, and 6g / L sorbitol as additives to the soybean urease solution. 2 Bone meal, 200g / m 2 The plant ash is used as an additive, and the laying thickness is three centimeters per square meter. Others are exactly the same as in Example 1.

[0043] Comparative Example 8

[0044] This example adopts the same method as Example 1 to prepare soybean urease binder, and adds 3g / L xanthan gum, 5g / L skim milk powder, 6g / L magnesium chloride, 6g / L sodium alginate, 5g / L lignin, and 6g / L sorbitol as additives to the soybean urease solution. 2 , plant fiber with single fiber fineness less than 100μm, 200g / m 2 The plant ash is used as an additive, and the laying thickness is three centimeters per square meter. Others are exactly the same as in Example 1.

[0045] Comparative Example 9

[0046] This example adopts the same method as Example 1 to prepare soybean urease binder, and adds 3g / L xanthan gum, 5g / L skim milk powder, 6g / L magnesium chloride, 6g / L sodium alginate, 5g / L lignin, and 6g / L sorbitol as additives to the soybean urease solution. 2 Plant fibers with a single fiber fineness of less than 100 μm, 150 g / m 2 The bone meal is used as an additive, and the laying thickness is 3 cm per square meter. Others are exactly the same as in Example 1.

[0047] Comparative Example 10

[0048] This example adopts the same method as Example 1 to prepare soybean urease binder, and adds 3g / L xanthan gum, 5g / L skim milk powder, 6g / L magnesium chloride, 6g / L sodium alginate, 5g / L lignin, and 6g / L sorbitol as additives to the soybean urease solution. 2 Plant fiber with single fiber fineness less than 100μm 150g / m 2 Bone meal, 200g / m 2 The plant ash is used as an additive, and the laying thickness is two centimeters per square meter. Others are exactly the same as in Example 1.

[0049] Comparative Example 11

[0050] This example adopts the same method as Example 1 to prepare soybean urease binder, and adds 3g / L xanthan gum, 5g / L skim milk powder, 6g / L magnesium chloride, 6g / L sodium alginate, 5g / L lignin, and 6g / L sorbitol as additives to the soybean urease solution. 2 Plant fiber with single fiber fineness less than 100μm 150g / m 2 Bone meal, 200g / m 2As an additive, plant ash is laid at a thickness of 1 cm per square meter. The rest is exactly the same as in Example 1.

[0051] The soil temperature and humidity were tested and analyzed for Example 1 and Comparative Examples 1-11.

[0052] Regarding soil temperature: An experimental field was selected in Laiwu, Jinan. The area of each experimental field is 120 m 2 , and nine points were selected in the field. The nine points were distributed in a grid pattern, and an untreated experimental field was selected on the side for measurement. A probe thermometer was used to measure the soil temperature. Three time points, 9:00, 14:00, and 18:00, were selected for testing every day in mid-September, and the test was conducted every two days. Finally, the data was summarized and the average value was taken. The temperatures of Example 1 and Comparative Examples 1-11 are as Figure 1 shown.

[0053] Regarding moisture content: Nine points were taken in the experimental field, distributed in a grid pattern, and an untreated experimental field was selected on the side for measurement. After sampling, in the laboratory, a dryer was used for thermogravimetric measurement. Samples were taken twice a day, and soil samples were taken at a depth of 10 cm from the soil surface. Samples were taken at 8:00 and 16:00 every day. After taking the samples, the in-situ soil was immediately filled. The temperatures of Example 1 and Comparative Examples 1-11 are as Figure 2 shown.

[0054] The experimental results show that: under the condition that the additives and laying thickness of the in-situ soil remain unchanged, the method of Example 1 can maximize the increase in soil temperature and soil moisture content, and the temperatures and water contents of Comparative Examples 1-6 are higher than those of the untreated group. This shows that adding xanthan gum, skim milk powder, magnesium chloride, sodium alginate, lignin, and sorbitol to the soybean urease solution can all increase the soil temperature and soil moisture content, and the additive combination used in Example 1 has a better effect than using one or other combinations.

[0055] When the additives in the soybean urease solution remain unchanged and the in-situ soil additives are modified as in Comparative Examples 7-9, the results show that the additive combination of plant fiber, bone meal, and plant ash used in Example 1 has the best effect on increasing soil temperature and soil moisture content. The temperatures and water contents in Comparative Examples 7-9 are higher than those of the untreated group, indicating that the additives of plant fiber, bone meal, and plant ash used in the in-situ soil can all increase the soil temperature and moisture content, and the combined use of the three has a better effect than the pairwise combination.

[0056] When the soybean urease solution additive and the in-situ soil additive remain unchanged, the change in the thickness of the in-situ soil will also affect the effect of increasing the soil temperature. Observation and comparison of Example 1, Comparative Examples 10-11 and the untreated group shows that the three-centimeter thickness of Example 1 is the best. As the thickness decreases, the effect decreases in turn, but they are all better than the untreated group.

[0057] The above is only a preferred embodiment 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 principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for laying an ecological mulch film, characterized in that: The steps include: (1) preparing soybean urease solution; (2) adding additives to obtain a soybean urease mixed solution; (3) preparing a salt solution of urea and calcium chloride; (4) preparing an in-situ soil mixture; (5) The soybean urease mixed solution and the salt solution are mixed to obtain a binder, which is added to an in-situ soil mixture and spread on a field. After drying, the binder obtains the ecological mulch film.

2. The laying method according to claim 1, characterized in that: The soybean urease solution in step (1) is prepared by mixing soybean powder passed through a 30-40 mesh sieve with water to a concentration of 35-45 g / L, stirring, passing through a 0.01-0.03 mm sieve, and centrifuging to obtain the supernatant to obtain the soybean urease solution.

3. The laying method according to claim 2, characterized in that: The additives in step (2) and their added concentrations in the soybean urease solution are: 2.5-3.5 g / L xanthan gum, 4.5-5.5 g / L skimmed milk powder, 5.5-6.5 g / L magnesium chloride, 5.5-6.5 g / L sodium alginate, 4.5-5.5 g / L lignin, and 5.5-6.5 g / L sorbitol.

4. The laying method according to claim 3, characterized in that: The molar concentration ratio of urea and calcium chloride in step (3) is 1-2:1-2, and the volume ratio thereof is 1-2:1-2.

5. The laying method according to claim 4, characterized in that: The in-situ soil mixture in step (4) is prepared by adding two or three of the following in-situ soil additives to the in-situ soil according to the in-situ soil area: 90-110 g / m 2 Plant fiber with single fiber fineness between 30μm and 100μm, 40-160g / m 2 Bone meal, 180-220g / m 2 The plant fiber comprises one or more of flax, ramie, jute and bamboo fiber.

6. The laying method according to claim 5, characterized in that: In step (5), the volume ratio of the soybean urease mixed solution to the salt solution is 1-2:1-2, and the binder and the in-situ soil are mixed in a volume ratio of 1-2:4-5.

7. The laying method according to claim 6, characterized in that: The paving thickness in step (5) is 3-5 cm, and the in-situ soil is taken in-situ according to the paving thickness.

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