Inland saline-alkali land soil conditioner and high-yield forage planting method

Abstract

The present invention discloses an inland saline-alkali soil conditioner and a high-yield planting method for forage, and belongs to the field of ecological restoration technology. The inland saline-alkali soil conditioner is composed of the following components in parts by weight: 7-10 parts of graphene oxide / zeolite, 30-50 parts of phosphogypsum, and 3-6 parts of cellulose hydrogel; the graphene oxide / zeolite is prepared according to the following steps: chitosan solution is added to NaCl-modified zeolite, and chitosan / zeolite is obtained by stirring at 30-35°C; water is used as a solvent, graphene oxide and chitosan / zeolite are added, and graphene oxide / zeolite is obtained by stirring at 70-80°C. The above-mentioned soil conditioner can effectively reduce the pH value, total salt content and alkalinity of moderate and severe inland saline-alkali soil. Combined with the high-yield planting technology of stress-resistant high-quality forage, it can significantly improve the vegetation coverage of moderate and severe inland saline-alkali land, prevent and control land desertification and increase forage yield.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological restoration, and more particularly to an inland saline-alkali land soil conditioner and a high-yield forage grass planting method. Background Art

[0002] Saline-alkali land is formed by the excessive diffusion and accumulation of water-soluble salts on the surface and is extremely difficult to use directly. Among them, NaCl, Na2SO4, Na2CO3 and NaHCO3 are the most common material forms of saline-alkali land. However, inland saline-alkali land usually has a poor ecological environment, lacks management technology, and is difficult to effectively utilize. As a result, the increasing salinization and secondary salinization have seriously restricted the improvement of soil quality and forage yield. Therefore, it is very urgent to rationally repair and utilize inland saline-alkali land and develop saline soil agriculture and animal husbandry based on saline-alkali soil conditioners and salt-tolerant plant resources.

[0003] High-quality, stress-resistant forage grasses are the foundation for improving inland saline-alkali land, restoring vegetation, and increasing productivity. Leymus chinensis Zhongke No. 1, bred by the Institute of Botany, Chinese Academy of Sciences, features high yield, high protein content, good palatability, strong regeneration ability, and abundant leaves. It is also cold-resistant, drought-resistant, salt-alkali-tolerant, and tolerant to infertility. It has been successfully introduced in Shaanxi, Ningxia, Inner Mongolia, and other regions. However, inland heavily, moderately, and secondary saline-alkali lands require desalination and alkalinization before forage establishment. Otherwise, highly salinized soils inhibit grass seed germination, thereby affecting seedling emergence, seed set, seed yield, and dry / fresh grass yield. This is currently a key and challenging issue in the ecological restoration and effective utilization of saline-alkali lands. Once soil conditioners have been used to reduce soil salinity to a certain extent, Leymus chinensis can be planted, achieving efficient utilization of saline-alkali lands.

[0004] Zeolite is a porous aluminosilicate mineral with an open three-dimensional structure and a unique tetrahedral lattice, which gives it a huge specific surface area and a large number of wide pores and channels. This determines its high ion adsorption capacity and adsorption exchange capacity, making it suitable for use as a soil conditioner. Although zeolite has a large specific surface area, in saline-alkali land, the pores of natural zeolite are easily blocked by water molecules and other Na+ ions of different radii. + , K + , Ca 2+ Mg 2+ The occupation of basic ions causes the pores of zeolite to be blocked, which in turn affects the ion exchange capacity and surface adsorption capacity of zeolite, making natural zeolite show certain limitations in improving saline-alkali soil. Summary of the Invention

[0005] To address the above problems, the present invention provides a soil conditioner and a high-yield forage grass planting method for inland saline-alkali land. The soil conditioner is first used to desalinate and reduce the alkali content of the soil, and then sheep fescue with strong stress resistance is planted. This method can effectively reduce the salinization degree of the soil, increase vegetation coverage, control land desertification and increase forage grass yield.

[0006] The first object of the present invention is to provide an inland saline-alkali land soil conditioner, the soil conditioner comprising the following components in parts by weight: 7-10 parts of graphene oxide / zeolite, 30-50 parts of phosphogypsum, and 3-6 parts of cellulose hydrogel;

[0007] The graphene oxide / zeolite is prepared according to the following steps:

[0008] Step 1, adding chitosan solution to NaCl-modified zeolite and stirring at 30-35° C. to obtain chitosan / zeolite;

[0009] Step 2: Using water as solvent, add graphene oxide and chitosan / zeolite, and stir at 70-80° C. to obtain graphene oxide / zeolite.

[0010] Preferably, in step 1, the stirring time is 5-7 h; the ratio of NaCl-modified zeolite to chitosan solution is 20-40 g:100 mL, and the concentration of the chitosan solution is 15-30 mg / mL.

[0011] Preferably, in step 1, chitosan is dissolved in 2% by volume acetic acid solution to prepare a 15-30 mg / mL chitosan solution.

[0012] Preferably, in step 2, the stirring time is 6-10 hours; the concentration of graphene oxide in water is 1-5 mg / mL, and the mass ratio of graphene oxide to chitosan / zeolite is 1-5:1.5-7.5.

[0013] Preferably, in step 1, the NaCl-modified zeolite is obtained by modifying the zeolite using sodium chloride as a modifier.

[0014] The second object of the present invention is to provide a high-yield forage planting method, which comprises adding the above-mentioned inland saline-alkali land soil conditioner to the saline-alkali land to be repaired and plowing the land; and planting forage in the improved saline-alkali land in the following year.

[0015] Preferably, the amount of the soil conditioner used is 300-400 kg / mu.

[0016] Preferably, the forage grass variety is Zhongke No. 1 Leymus chinensis;

[0017] The sowing method is no-till hole sowing, the sowing time is July, the sowing amount is 2-3kg / mu, 8-11 grass seeds per hole, the row spacing is 15cm, and the sowing depth is 1-2cm.

[0018] Preferably, the seeds of Zhongke No. 1 Leymus chinensis are disinfected with sodium hypochlorite before sowing;

[0019] After sowing, field management is carried out, including irrigation, pest and disease control, and weeding; after the next year, mowing is carried out once in July and September each year.

[0020] Preferably, the saline-alkali land is moderate or severe inland saline-alkali land.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] First, the present invention uses NaCl as a modifier to prepare NaCl-modified zeolite, so that the original pores can be opened up and the internal pore structure is clearer. Then, chitosan is used as a bridge to introduce graphene oxide into the zeolite surface to prepare modified zeolite, so that the pores on the zeolite surface are richer, and the specific surface area and pore volume are increased, thereby improving the ion exchange capacity and surface adsorption capacity of the zeolite. The modified zeolite is then compounded with phosphogypsum and cellulose hydrogel into a soil improver, and the soil improver is applied to moderate or severe inland saline-alkali land; the following year, the Zhongke No. 1 sheepgrass with salt-alkali resistance, cold and drought resistance, high yield and good palatability is planted, thereby achieving ecological benefits such as saline-alkali land improvement, desertification construction, wind and sand fixation, and water conservation, while also increasing the yield of high-quality forage and improving economic benefits.

[0023] The present invention selects the no-till hole sowing method to sow sheep fescue, which is simple and easy to operate; the loose soil forms holes, which can effectively retain moisture during irrigation or rainfall near the seeds, thereby resisting drought and conserving moisture; and the no-till method involves less soil disturbance, which reduces damage to the soil structure and surface morphology, can reduce the risk of soil erosion, and is suitable for application and promotion in inland saline-alkali land ecologically fragile areas.

[0024] By utilizing the soil conditioner and the high-yield planting method of forage provided by the present invention, effective restoration and efficient utilization of moderate and severe inland saline-alkali land can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the cation exchange capacity of the modified zeolite prepared in Example 1 and Comparative Examples 1-2;

[0026] Figure 2 The rhizomes of Leymus chinensis in a hole during the greening period (a) and the overall growth of Leymus chinensis (b) in Example 7;

[0027] Figure 3 The hay yield of Leymus chinensis in the planting methods of Examples 7-10 and Comparative Examples 5-6;

[0028] Figure 4The yield of Leymus chinensis seeds in the planting methods of Examples 7-10 and Comparative Examples 5-6. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] The following experimental and detection methods, unless otherwise specified, are conventional methods; the following reagents and raw materials, unless otherwise specified, are commercially available reagents and raw materials. The natural zeolite used in this invention was purchased from Feiyue Stone Processing Plant in Hongqiao District, Tianjin, and the Zhongke No. 1 Leymus chinensis seeds were purchased from Inner Mongolia Keta Grass Industry Co., Ltd.

[0031] Example 1

[0032] This embodiment provides a method for preparing a modified zeolite, which is prepared according to the following steps:

[0033] Step 1. Weigh 8 g of natural zeolite that has been washed and dried and place it in a flask. Add 100 mL of a 10% NaCl solution by mass, disperse it evenly, and stir it in a 40°C water bath for 12 hours. After the reaction is completed, rinse it with distilled water until it is neutral, and dry it at 40°C to obtain NaCl-modified zeolite for later use.

[0034] Weigh chitosan and dissolve it in 2% by volume acetic acid solution, and ultrasonically vibrate to obtain a 20 mg / mL chitosan solution for later use;

[0035] 100 mL of chitosan solution was measured, and 30 g of NaCl-modified zeolite was added. The mixture was stirred in a 30°C water bath for 6 h. After the reaction was completed, the mixture was filtered, washed with acetic acid solution three times, and then washed with distilled water four times, and then dried at 40°C to obtain chitosan / zeolite.

[0036] Step 2: 0.1 g of graphene oxide was evenly dispersed in 100 mL of water to prepare a 1 mg / mL graphene oxide solution, 0.2 g of chitosan / zeolite was added, and after ultrasonic dispersion, the mixture was transferred to an oil bath and magnetically stirred at 70 ° C for 6 h. After the reaction was completed, the mixture was centrifuged, washed with distilled water, and centrifuged 4 times, and then freeze-dried to obtain graphene oxide / zeolite, i.e., modified zeolite.

[0037] Example 2

[0038] This embodiment provides a method for preparing a modified zeolite, which is prepared according to the following steps:

[0039] Step 1. Weigh 8 g of natural zeolite that has been washed and dried and place it in a flask. Add 100 mL of a 10% NaCl solution by mass, disperse it evenly, and stir it in a 40°C water bath for 12 hours. After the reaction is completed, rinse it with distilled water until it is neutral, and dry it at 40°C to obtain NaCl-modified zeolite for later use.

[0040] Weigh chitosan and dissolve it in 2% by volume acetic acid solution, and ultrasonically vibrate to obtain a 20 mg / mL chitosan solution for later use;

[0041] 100 mL of chitosan solution was measured, and 30 g of NaCl-modified zeolite was added. The mixture was stirred in a 30°C water bath for 6 h. After the reaction was completed, the mixture was filtered, washed with acetic acid solution three times, and then washed with distilled water four times, and then dried at 40°C to obtain chitosan / zeolite.

[0042] Step 2: 0.1 g of graphene oxide was evenly dispersed in 100 mL of water to prepare a 1 mg / mL graphene oxide solution, 0.15 g of chitosan / zeolite was added, and after ultrasonic dispersion, the mixture was transferred to an oil bath and magnetically stirred at 70 ° C for 6 h. After the reaction was completed, the mixture was centrifuged, washed with distilled water, and centrifuged 4 times, and then freeze-dried to obtain graphene oxide / zeolite, i.e., modified zeolite.

[0043] Example 3

[0044] This embodiment provides a method for preparing a modified zeolite, which is prepared according to the following steps:

[0045] Step 1. Weigh 8 g of natural zeolite that has been washed and dried and place it in a flask. Add 100 mL of a 10% NaCl solution by mass, disperse it evenly, and stir it in a 40°C water bath for 12 hours. After the reaction is completed, rinse it with distilled water until it is neutral, and dry it at 40°C to obtain NaCl-modified zeolite for later use.

[0046] Weigh chitosan and dissolve it in 2% by volume acetic acid solution, and ultrasonically vibrate to obtain a 20 mg / mL chitosan solution for later use;

[0047] 100 mL of chitosan solution was measured, and 30 g of NaCl-modified zeolite was added. The mixture was stirred in a 30°C water bath for 6 h. After the reaction was completed, the mixture was filtered, washed with acetic acid solution three times, and then washed with distilled water four times, and then dried at 40°C to obtain chitosan / zeolite.

[0048] Step 2: 0.1 g of graphene oxide was evenly dispersed in 100 mL of water to prepare a 1 mg / mL graphene oxide solution, 0.4 g of chitosan / zeolite was added, and after ultrasonic dispersion, the mixture was transferred to an oil bath and magnetically stirred at 70 ° C for 6 h. After the reaction was completed, the mixture was centrifuged, washed with distilled water, and centrifuged 4 times, and then freeze-dried to obtain graphene oxide / zeolite, i.e., modified zeolite.

[0049] Comparative Example 1

[0050] This comparative example provides a method for preparing a modified zeolite, which is prepared according to the following steps:

[0051] Step 1. Weigh 8 g of natural zeolite that has been washed and dried and place it in a flask. Add 100 mL of a 10% NaCl solution by mass, disperse it evenly, and stir it in a 40°C water bath for 12 hours. After the reaction is completed, rinse it with distilled water until it is neutral, and dry it at 40°C to obtain NaCl-modified zeolite for later use.

[0052] Weigh chitosan and dissolve it in 2% by volume acetic acid solution, and ultrasonically vibrate to obtain a 20 mg / mL chitosan solution for later use;

[0053] 100 mL of chitosan solution was measured, 30 g of NaCl-modified zeolite was added, and the mixture was stirred in a 30°C water bath for 6 h. After the reaction was completed, it was filtered, washed with acetic acid solution 3 times, and then washed with distilled water 4 times, and then dried at 40°C to obtain chitosan / zeolite, which was recorded as modified zeolite.

[0054] Comparative Example 2

[0055] This comparative example provides a method for preparing a modified zeolite, which is prepared according to the following steps:

[0056] Step 1: Weigh 8 g of natural zeolite that has been cleaned and dried and place it in a flask. Add 100 mL of a 10% mass fraction NaCl solution, disperse it evenly, and stir it in a 40°C water bath for 12 hours. After the reaction is completed, rinse it with distilled water until it is neutral, and dry it at 40°C to obtain NaCl-modified zeolite, which is recorded as modified zeolite.

[0057] Cation exchange capacity test: Weigh 1g of zeolite sample and place it in a beaker. Add 150mL of 1mol / L NH4Cl solution and boil on an electric stove for 20min. Pour out the supernatant and transfer the wet zeolite sample to a glass funnel. Wash with distilled water until there is no Cl. - Repeat the treatment three times, then use 100 mL of 10% KCl solution at 60 ° C to elute the NH4 adsorbed on the zeolite in multiple times + , collect the eluate, and use the formaldehyde method to determine the eluted NH4 + The total amount is calculated according to the following formula to calculate the cation exchange capacity of each modified zeolite;

[0058]

[0059] Where: Q C is the cation exchange capacity, mmol / g; Q NH4+ is the total amount of ammonium ions, mmol; W is the mass of zeolite, g.

[0060] The modified zeolites prepared in Example 1 and Comparative Examples 1-2 were tested for cation exchange capacity. Figure 1 As shown, it can be seen that the modified zeolite prepared by the present invention effectively improves the cation exchange capacity of the zeolite.

[0061] Example 4

[0062] This embodiment provides an inland saline-alkali soil conditioner, which is composed of the following components in parts by weight: 7 kg of graphene oxide / zeolite, 30 kg of phosphogypsum, and 3 kg of cellulose hydrogel.

[0063] The graphene oxide / zeolite used in this example was prepared in Example 1.

[0064] Example 5

[0065] This embodiment provides an inland saline-alkali soil conditioner, which is composed of the following components in parts by weight: 10 kg of graphene oxide / zeolite, 50 kg of phosphogypsum, and 4 kg of cellulose hydrogel.

[0066] The graphene oxide / zeolite used in this example was prepared in Example 1.

[0067] Example 6

[0068] This embodiment provides an inland saline-alkali soil conditioner, which is composed of the following components in parts by weight: 8 kg of graphene oxide / zeolite, 40 kg of phosphogypsum, and 6 kg of cellulose hydrogel.

[0069] The graphene oxide / zeolite used in this example was prepared in Example 1.

[0070] Comparative Example 3

[0071] This comparative example provides an inland saline-alkali land soil conditioner, which is composed of the following components in parts by weight: 8 kg of zeolite, 40 kg of phosphogypsum, and 6 kg of cellulose hydrogel.

[0072] The zeolite used in this comparative example is original untreated zeolite.

[0073] Comparative Example 4

[0074] This comparative example provides an inland saline-alkali land soil conditioner, which is composed of the following components in parts by weight: 40 kg of phosphogypsum and 6 kg of cellulose hydrogel.

[0075] A typical secondary saline-alkali land was selected in Yanchi County, Wuzhong City, Ningxia Hui Autonomous Region and divided into four blocks, each with an area of about 0.1 mu and 5 meters apart. The pH of the selected saline-alkali soil was 9.41, the total salt content was 1.68 g / kg, and the mass ratio of NaCl: Na2SO4: NaHCO3: Na2CO3 was 1:9:9:1. The soil conditioners prepared in Example 6, Comparative Example 3 and Comparative Example 4 were respectively applied to the saline-alkali land in the three areas, and the soil conditioners were ploughed to mix the soil conditioners with the saline-alkali soil. The soil conditioners were applied at a standard of 300 kg / mu. The saline-alkali land in the fourth area was only ploughed and served as a blank control group.

[0076] Table 1 Soil properties of inland saline-alkali land under different treatments

[0077]

[0078] As can be seen from Table 1, compared with Comparative Example 3, the modified zeolite (i.e., graphene oxide / zeolite) obtained by modifying the zeolite in the present invention effectively increases the cation exchange capacity of the zeolite and is used in saline-alkali soil, which can significantly reduce the pH value, total salt content and alkalinity of the soil; in addition, compared with Comparative Example 4, the soil conditioner prepared by compounding graphene oxide / zeolite with phosphogypsum and cellulose hydrogel in the present invention can effectively reduce the pH value, total salt content and alkalinity of the soil.

[0079] Example 7

[0080] This embodiment provides a high-yield forage grass planting method. The method is carried out according to the following steps:

[0081] The soil conditioner prepared in Example 4 was added to the saline-alkali land to be treated, and the land was plowed to uniformly mix the soil conditioner with the soil; the application amount of the soil conditioner was 350 kg / mu.

[0082] The following year, the seeds of Zhongke No. 1 sheepgrass were disinfected with 4% sodium hypochlorite for 30 minutes before sowing. In July, no-tillage sheepgrass was sown in holes, with a sowing rate of 2 kg per mu (8 seeds per 2 cm x 2 cm hole), 15 cm spacing between rows, and a sowing depth of 2 cm. After sowing, routine field management was carried out, including irrigation, pest control, and weed control. Starting the following year, mowing was carried out once a year in July and September, yielding 1,083.68 kg of hay and 48.37 kg of grass seeds per mu over two years. Figure 2 The figure shows the rhizome and overall growth of Leymus chinensis in a hole during the greening period in Example 7. As can be seen from the figure, there are 128 buds on the rhizome, indicating that the lower part of Leymus chinensis has a strong asexual reproduction ability and a fast growth rate. Figure 3 and Figure 4 .

[0083] Example 8

[0084] This embodiment provides a high-yield forage planting method, which is carried out according to the following steps:

[0085] The soil conditioner prepared in Example 4 was added to the saline-alkali land to be treated, and the land was plowed to uniformly mix the soil conditioner with the soil; the amount of soil conditioner applied was 400 kg / mu.

[0086] The following year, the seeds of Zhongke No. 1 sheepgrass were disinfected with 4% sodium hypochlorite for 30 minutes, and then sown. In July, sheepgrass was sown in holes without tillage, with a sowing rate of 2 kg / mu, 8 seeds per hole (2cm×2cm), a row spacing of 15 cm, and a sowing depth of 2 cm. After sowing, routine field management was carried out, including irrigation, pest and disease control, and weed control. Starting from the following year, mowing was done once in July and September each year. Each acre of land can harvest 1009.31 kg of hay and 42.90 kg of grass seeds in two years. The yield of hay and grass seeds can be seen in Figure 3 and Figure 4 .

[0087] Example 9

[0088] This embodiment provides a high-yield forage planting method, which is carried out according to the following steps:

[0089] The soil conditioner prepared in Example 6 was added to the saline-alkali land to be treated, and the land was plowed to uniformly mix the soil conditioner with the soil; the application amount of the soil conditioner was 300 kg / mu.

[0090] The following year, the seeds of Zhongke No. 1 sheepgrass were disinfected with 4% sodium hypochlorite for 30 minutes, and then sown. In July, sheepgrass was sown in holes without tillage, with a sowing rate of 3kg / mu, 11 grass seeds per hole (2cm×2cm), a row spacing of 15cm, and a sowing depth of 2cm. After sowing, routine field management was carried out, including irrigation, pest and disease control, and weed control. Starting from the following year, mowing was done once in July and September each year. Each acre of land can harvest 1198.46kg of hay and 54.39kg of grass seeds in two years. The yield of hay and grass seeds can be seen in Figure 3 and Figure 4 .

[0091] Example 10

[0092] This embodiment provides a high-yield forage planting method, which is carried out according to the following steps:

[0093] The soil conditioner prepared in Example 5 was added to the saline-alkali land to be treated, and the land was plowed to uniformly mix the soil conditioner with the soil; the amount of soil conditioner applied was 300 kg / mu.

[0094] The following year, the seeds of Zhongke No. 1 sheepgrass were disinfected with 4% sodium hypochlorite for 30 minutes, and then sown. In July, sheepgrass was sown in holes without tillage, with a sowing rate of 2.3 kg / mu, 9 grass seeds per hole (2 cm × 2 cm), a row spacing of 15 cm, and a sowing depth of 2 cm. After sowing, routine field management was carried out, including irrigation, pest and disease control, and weed control. Starting from the following year, mowing was done once in July and September each year. Each acre of land can harvest 1073.12 kg of hay and 48.61 kg of grass seeds in two years. The yield of hay and grass seeds can be seen in Figure 3 and Figure 4 .

[0095] Comparative Example 5

[0096] This comparative example provides a method for planting forage grass, which is carried out according to the following steps:

[0097] The soil conditioner prepared in Example 6 was added to the saline-alkali land to be treated, and the land was plowed to uniformly mix the soil conditioner with the soil; the application amount of the soil conditioner was 300 kg / mu.

[0098] The following year, the seeds of Zhongke No. 1 sheepgrass were disinfected with 4% sodium hypochlorite for 30 minutes and sown after disinfection. In July, sheepgrass was sown in strips without tillage, with a sowing rate of 3kg / mu, a sowing row spacing of 15cm, and a sowing depth of 2cm. After sowing, routine field management was carried out, including irrigation, pest and disease control, and weed control. Starting from the following year, mowing was done once in July and September each year. Each acre of land can harvest 903.47kg of hay and 37.52kg of grass seeds in two years. The yield of hay and grass seeds is shown in Figure 3 and Figure 4 .

[0099] Comparative Example 6

[0100] In this comparative example, Leymus chinensis was directly planted in saline-alkali land, and the planting method of Leymus chinensis was the same as that in Example 9.

[0101] The seeds of Zhongke No. 1 sheepgrass were disinfected with 4% sodium hypochlorite for 30 minutes, and then sown after disinfection. In July, sheepgrass was sown in holes without tillage, with a sowing rate of 3kg / mu, 11 grass seeds per hole (2cm×2cm), a row spacing of 15cm, and a sowing depth of 2cm. After sowing, routine field management was carried out, including irrigation, pest and disease control, and weed control. Starting from the following year, mowing was done once in July and September each year. Each acre of land can harvest 233.77kg of hay and 11.64kg of grass seeds in two years. The yield of hay and grass seeds can be seen in Figure 3 and Figure 4 .

[0102] Depend on Figure 3 and Figure 4It can be seen that after the soil conditioner prepared by the present invention is used to desalinate and reduce the alkali content of inland severely saline-alkali soil, the hay yield and grass seed yield of the planted sheep fescue can be significantly increased; at the same time, compared with the comparative example 5 in which sheep fescue is sown by the no-tillage strip sowing method, the sheep fescue planted by the no-tillage hole sowing method in Example 7 of the present invention has a hay yield that is 32.65% higher than that of the strip sowing method, and the grass seed yield is increased by 44.96%, indicating that the no-tillage hole sowing planting method selected by the present invention is more conducive to increasing forage yield.

[0103] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0104] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. An inland saline-alkali soil conditioner, characterized in that: The soil conditioner is composed of the following components in parts by weight: 7-10 parts of graphene oxide / zeolite, 30-50 parts of phosphogypsum, and 3-6 parts of cellulose hydrogel; The graphene oxide / zeolite is prepared according to the following steps: Step 1, adding chitosan solution to NaCl-modified zeolite and stirring at 30-35° C. to obtain chitosan / zeolite; in step 1, the stirring time is 5-7 hours; the ratio of NaCl-modified zeolite to chitosan solution is 20-40 g:100 mL, and the concentration of chitosan solution is 15-30 mg / mL; Step 2: Using water as solvent, add graphene oxide and chitosan / zeolite, and stir at 70-80° C. to obtain graphene oxide / zeolite. In step 2, the stirring time is 6-10 hours; the concentration of graphene oxide in water is 1-5 mg / mL, and the mass ratio of graphene oxide to chitosan / zeolite is 1-5:1.5-7.

5.

2. The inland saline-alkali soil conditioner according to claim 1, characterized in that In step 1, chitosan is dissolved in 2% by volume acetic acid solution to prepare a 15-30 mg / mL chitosan solution.

3. The inland saline-alkali soil conditioner according to claim 1, characterized in that In step 1, the NaCl-modified zeolite is obtained by modifying the zeolite using sodium chloride as a modifier.

4. A high-yield forage grass planting method, characterized in that: The inland saline-alkali land soil conditioner according to any one of claims 1 to 3 is added to the saline-alkali land to be repaired and plowed; and in the following year, forage grass is planted in the improved saline-alkali land.

5. The high-yield forage planting method according to claim 4, characterized in that: The dosage of the soil conditioner is 300-400 kg / mu.

6. The high-yield forage planting method according to claim 4, characterized in that: The forage variety is Zhongke No. 1 Leymus chinensis; The sowing method is no-till hole sowing, the sowing time is July, the sowing amount is 2-3 kg / mu, 8-11 grass seeds per hole, the row spacing is 15 cm, and the sowing depth is 1-2 cm.

7. The high-yield forage planting method according to claim 4, characterized in that: Before sowing, the seeds of Zhongke No. 1 Leymus chinensis were disinfected with sodium hypochlorite; After sowing, field management is carried out, including irrigation, pest and disease control, and weeding; after the next year, mowing is carried out once in July and September each year.

8. The high-yield forage planting method according to claim 4, characterized in that: The saline-alkali land is moderate or severe inland saline-alkali land.

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