Method for strip planting of high-sugar-cane and sesbania in saline-alkali soil

Abstract

The application discloses a high-sorghum-sudan-grass and sesbania banded planting method, and belongs to the technical field of forage grass planting. The high-sorghum-sudan-grass and sesbania banded planting method comprises the following steps: carrying out banded planting of high-sorghum-sudan-grass and sesbania in a banded planting mode of 4 rows of high-sorghum-sudan-grass + 2 rows of sesbania. The banded planting of the high-sorghum-sudan-grass and sesbania adopts a dry-planting-wet-harvesting cultivation mode of drip irrigation under a film and precision seeding on the film. The banded planting of the high-sorghum-sudan-grass and sesbania significantly improves the population characters, forage grass quality and production capacity of the high-sorghum-sudan-grass, mainly in that the plant height and stem diameter of the high-sorghum-sudan-grass are increased, the fresh grass yield, crude protein content, total volatile fatty acid and dry matter disappearance rate of the mixed forage grass are improved, and the mixed forage grass of the high-sorghum-sudan-grass and sesbania obtained by cutting can be directly ensiled or directly fed to livestock. The high-sorghum-sudan-grass and sesbania banded planting method can improve the population characters, forage grass quality and production capacity of the high-sorghum-sudan-grass, and also can improve the saline-alkali soil.

Description

Technical Field

[0001] The invention relates to the technical field of forage grass planting, in particular to a strip planting method of sorghum and sesbania in saline-alkali land. Background Art

[0002] There are relatively few species of legumes and grasses suitable for cultivation in saline-alkali land. Currently, there are crops such as oats, sorghum, sesbania, and alfalfa. Sorghum Bicolor x S. sudanense ) is a crop with strong tolerance to abiotic stress and high water use efficiency, strong digestion and regeneration ability, salt and alkali tolerance, rich in soluble carbohydrates, and can save more than 30% of water and more than 10% of nitrogen fertilizer compared to corn. Sesbania cannabina ) is an annual herbaceous plant of the genus Sesbania in the Leguminosae family. It is high in crude protein and has strong nitrogen-fixing capacity. It is tolerant to salt, waterlogging, barrenness, drought, and pests. It can grow on saline soils with a salinity of 0.6% or alkaline soils with a pH of 9.5. Sorghum and Sesbania have the potential to be cultivated on saline-alkali soils. However, previous research on sorghum and Sesbania has primarily focused on single sowing or mixed sowing with other crops. However, in mixed sowing systems, crops compete for resources such as light and temperature. In semi-arid regions, underground interspecific competition is crucial for increasing yield and maintaining the long-term function of the sowing system. Traditional single forage crop cultivation systems have higher planting costs and lower overall benefits than mixed cropping systems. Therefore, developing new planting models for sorghum and Sesbania is crucial. Intercropping different forage crops offers advantages such as increased sowing productivity, lodging prevention, and efficient resource utilization, resulting in better ecological and economic benefits. There are no reports on the strip configuration of intercropping of sorghum and sesbania in the prior art. Research on the strip planting method of sorghum and sesbania suitable for saline-alkali land has broad development prospects. Summary of the Invention

[0003] The purpose of the present invention is to provide a strip planting method for sorghum and sesbania in saline-alkali land to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] One of the technical solutions of the present invention is a strip planting method of sorghum and sesbania in saline-alkali land, which uses a strip planting pattern of 4 rows of sorghum + 2 rows of sesbania to carry out strip planting of sorghum and sesbania.

[0006] That is, 4 rows of sorghum are planted on one sorghum planting strip, and 2 rows of sesbania are planted on one sesbania planting strip, and the sorghum planting strips and the sesbania planting strips are arranged alternately.

[0007] The strip planting of high-dan grass and sesbania can significantly improve the population characteristics of high-dan grass, the quality and production capacity of mixed forage grass, because more marginal effects are formed, the high-dan grass grows fast and the plant is tall, the sesbania grows slowly and the plant is relatively low, a wave pattern is formed during the growth period, more margins are increased, the growth of high-dan grass is promoted, the resource utilization efficiency is improved, and the land equivalent ratio is improved; and the row ratio of 4:2 of high-dan grass and sesbania is in line with the root characteristics of the two and the reasonable space utilization rate of soil, and the improvement effect on the population characteristics of high-dan grass, the quality and production capacity of mixed forage grass is more obvious. At the same time, the strip planting of high-dan grass and sesbania can also improve the saline-alkali soil, reduce the soil pH, reduce the soil salt content, increase the soil microbial diversity, and improve the soil organic matter content.

[0008] Further, the strip planting of high-dan grass and sesbania adopts a dry planting and wet harvesting cultivation mode of drip irrigation under the film and precision seeding on the film.

[0009] The cultivation mode of drip irrigation under the film and precision seeding on the film can keep the soil loose and in the best water content state, and the water consumption is only 50% of that of conventional irrigation.

[0010] Further, the row spacing of the high-dan grass is 60 cm, the plant spacing is 15 cm; the row spacing of the sesbania is 60 cm, the plant spacing is 15 cm; and the row spacing between the high-dan grass and the sesbania is 60 cm.

[0011] Further, the high-dan grass and the sesbania are sowed and harvested at the same time; and the sowing is performed in spring or summer.

[0012] Further, before the sowing, 320 kg·hm -2 .

[0013] Further, the compound fertilizer is composed of urea and diammonium phosphate, and the mass ratio of the urea to the diammonium phosphate is 3:1.

[0014] Further, after the sowing, a step of intertillage is further included, and the intertillage includes: intertillage is performed at the germination period and the seedling period of the high-dan grass and the sesbania, and the soil depth is 10-15 cm.

[0015] Further, the harvesting is performed twice a year.

[0016] Further, after the sowing, a step of water and fertilizer management is further included, and the water and fertilizer management includes: from the sowing day to the heading period before the first cutting, a total of 6 times of water dripping is performed, and the total water dripping amount is 3525 m 3 ·hm -2 , and topdressing is performed at the same time; after the first cutting, water dripping and topdressing are performed once every 15-20 days.

[0017] Furthermore, from the sowing day to the heading period before the first mowing, water was dripped 6 times, with a total dripping volume of 3525m 3 ·hm -2 , topdressing at the same time as dripping includes: the first dripping on the day after sowing (the day of sowing is counted as day 0 after sowing), the dripping amount is 200 m 3 ·hm -2 ; The second dripping was carried out on the 4th day after sowing, with a dripping volume of 175 m 3 ·hm -2 , drip irrigation 1-2kg / mu wood vinegar; the third drip irrigation is carried out 45-60 days after sowing, with a dripping volume of 900 m 3 ·hm -2 , urea 150 kg·hm -2 and diammonium phosphate 75 kg·hm -2 ; The fourth dripping was carried out on the 61st to 70th day after sowing, with a dripping volume of 750 m 3 ·hm -2 , urea 150kg·hm -2 ; The fifth dripping was carried out on the 80th to 90th day after sowing, with a dripping volume of 750 m 3 ·hm -2 , urea 150 kg·hm -2 ; The sixth dripping was carried out on the 91st to 100th day after sowing, with a dripping volume of 750 m 3 ·hm -2 , urea 150 kg·hm -2 ;

[0018] And / or, after the first mowing, watering and topdressing every 15 to 20 days include: each dripping amount is 750m 3 ·hm -2 , urea 225 kg·hm -2 .

[0019] Furthermore, the sowing is carried out in early April.

[0020] The second technical solution of the present invention is a method for improving saline-alkali land, which includes planting sorghum and sesbania in strips on saline-alkali land in a strip planting pattern of 4 rows of sorghum + 2 rows of sesbania.

[0021] The present invention discloses the following technical effects:

[0022] The present application significantly improves the population characteristics, forage quality and production capacity of sorghum-sudang hybrid by strip planting of sorghum and sesbania, mainly showing that the plant height and stem diameter of sorghum increase, the fresh forage yield, crude protein (CP) content, total volatile fatty acid (TVFA) and dry matter disappearance rate (DMD) of mixed forage are improved, and the interannual performance is the same. Specifically, under the S4C2 strip planting mode, the plant height of sorghum increases by 7.94-33.04%; the fresh forage yield is up to 125.13 t·hm -2 (2023), 129.20 t·hm -2 (2024), which is significantly increased by 20.56% and 13.79% (P<0.05) compared with MS; the crude protein content increases by 14.25-32.64%, and the crude fat (EE) and crude ash (Ash) contents also increase to different degrees; the concentrations of acetic acid, propionic acid and valeric acid increase, and the total volatile fatty acid and dry matter disappearance rate are significantly increased by 3.80% and 19.30% (P<0.05), respectively. Moreover, under the S4C2 strip planting mode, in addition to improving the population characteristics, forage quality and production capacity of sorghum, it can also improve the soil condition of saline-alkali land. The 4:2 mode of strip planting between sorghum and sesbania is suitable for popularization and application in arid desert oasis areas such as southern Xinjiang.

[0023] The mixed forage of sorghum and sesbania obtained under the S4C2 strip planting mode of the present application has rich and high content of nutritional ingredients, high dry matter disappearance rate, easy to be digested and absorbed by animals, and is beneficial to increasing the foraging amount of animals, which can provide sufficient nutrients for animal growth. Therefore, under the S4C2 strip planting mode of sorghum and sesbania in the present application, the mixed forage of sorghum and sesbania obtained by simultaneous harvesting can be directly ensiled or directly fed to livestock, which can not only greatly reduce the production and preparation cost, but also improve the ensiling quality. The prepared ensiled feed can meet the growth needs of animals without being combined with other forage, especially the nutritional needs of forage for the best production performance of ruminant livestock. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The schematic diagram of different planting modes (MS, MC, S2C2, S4C2, S4C4, S6C4) in Example 1 and Comparative Examples 1-5;

[0026] Figure 2For the growth of high-sweet sorghum and Sesbania S4C2 in the first cutting in 2023 under the strip planting mode of high-sweet sorghum and Sesbania S4C2 in Example 1;

[0027] Figure 3 For the fresh grass yield test results of four harvests in 2023 and 2024 under different planting modes of Example 1 and Comparative Examples 1-5;

[0028] Figure 4 For the radar chart of the yield and quality comprehensive evaluation of high-sweet sorghum and Sesbania under different planting modes of Example 1 and Comparative Examples 1-5. DETAILED DESCRIPTION

[0029] The various illustrative embodiments of the present application will now be described in detail below. This detailed description is merely intended to teach a person skilled in the art further details about the aspects, features and / or embodiments of the present application and is not intended to limit the scope of the present application. Therefore, it is contemplated that other alternatives will occur to a person skilled in the art once advised of the aspects, features and / or embodiments of the present application.

[0030] It should be understood that the terms used in the present application merely describe particular embodiments and are not intended to limit the present application. In addition, for numerical ranges in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range within any stated range or intermediate value, and any other stated, or intermediate value, is also encompassed within the scope of the present application. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, preferred methods and materials are described. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict between the content of the specification and that of any document incorporated by reference, the content of the specification prevails.

[0032] Various modifications and changes can be made to the specific embodiments of the present application described herein without departing from the scope or spirit of the application. Other embodiments of the application will be apparent to those of ordinary skill in the art from the description and examples that are given. The specification is not to be considered as limiting the application in any way.

[0033] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having" or the like are open-ended terms that are intended to mean including, but not limited to.

[0034] As a first aspect of the present application, the present application provides a method for strip planting of high-sweet sorghum and Sesbania in saline-alkali soil, which strip plants high-sweet sorghum and Sesbania in a strip planting mode of 4 rows of high-sweet sorghum + 2 rows of Sesbania.

[0035] As an embodiment of the present application, the high-sweet sorghum and sesbania are planted in a strip pattern using a dry seeding and wet harvesting cultivation method with drip irrigation under a film and precision seeding on the film.

[0036] As a preferred embodiment of the present application, the method for strip planting of high-sweet sorghum and sesbania in saline-alkali soil comprises the following steps:

[0037] (1) Setting a strip planting pattern: the strip planting pattern of high-sweet sorghum and sesbania is 4 rows of high-sweet sorghum + 2 rows of sesbania, and the high-sweet sorghum planting strip and the sesbania planting strip are arranged alternately, the row spacing of high-sweet sorghum and sesbania is 60 cm, the plant spacing is 15 cm, and the row spacing between high-sweet sorghum and sesbania is also 60 cm;

[0038] (2) Seeding: seeding of high-sweet sorghum and sesbania is simultaneously performed according to the set strip planting pattern, and before seeding, 320 kg·hm -2 of compound fertilizer (urea and diammonium phosphate, mass ratio of 3:1) is applied;

[0039] (3) Cultivation: cultivation is performed at the germination stage and the seedling stage of the forage grass, and the soil depth is 10-15 cm;

[0040] (4) Water and fertilizer management: from the seeding day to the heading stage before the first cutting, a total of 6 times of water dripping is performed, and the total water dripping amount is 3525 m 3 ·hm -2 , and topdressing is performed at the same time; specifically, the first time of water dripping is performed on the next day of seeding, and the water dripping amount is 200 m 3 ·hm -2 ; the second time of water dripping is performed on the 4th day after seeding, and the water dripping amount is 175 m 3 ·hm -2 , and 1-2 kg / acre of wood vinegar liquid is drip irrigated; the third time of water dripping is performed on the 45th-60th day after seeding, and the water dripping amount is 900 m 3 ·hm -2 , and 150 kg·hm -2 of urea and 75 kg·hm -2 of diammonium phosphate are applied; the fourth time of water dripping is performed on the 61st-70th day after seeding, and the water dripping amount is 750 m 3 ·hm -2 , and 150 kg·hm -2 of urea is applied; the fifth time of water dripping is performed on the 80th-90th day after seeding, and the water dripping amount is 750 m 3 ·hm -2 , and 150 kg·hm -2 of urea is applied; the sixth time of water dripping is performed on the 91st-100th day after seeding, and the water dripping amount is 750 m 3 ·hm -2 , and 150 kg·hm-2 ;

[0041] (5) The first cutting and water and fertilizer management after the first cutting: the first cutting of high-growth grass and sesbania herbacea (generally, the first cutting is performed 100 days after sowing or after the high-growth grass blooms, and the high-growth grass and sesbania herbacea are cut at the same time), and water is dripped and fertilizer is applied once every 15-20 days after the first cutting, including: the amount of water dripped each time is 750 m 3 ·hm -2 , and the amount of urea applied is 225 kg·hm -2 ;

[0042] (6) The second cutting: the second cutting of high-growth grass and sesbania herbacea (generally, the second cutting is performed 60-70 days after the first cutting or after the high-growth grass blooms, and the high-growth grass and sesbania herbacea are cut at the same time).

[0043] As a preferred embodiment of the present application, the sowing is performed in early April.

[0044] As a second aspect of the present application, the present application provides a method for improving saline-alkali land, and the high-growth grass and sesbania herbacea are planted in a strip planting mode of 4 rows of high-growth grass + 2 rows of sesbania herbacea on the saline-alkali land.

[0045] The technical solutions of the present application will be further described below in combination with specific examples.

[0046] The planting tests of the following examples and comparative examples of the present application are all performed in test fields under the same conditions, and the test field is as follows: the test field is located in Alar City, Xinjiang, and belongs to a typical warm temperate continental arid climate. The light and heat resources in the area are rich, the annual radiation is 9733 MJ·m -2 , the annual average sunshine hours are 2650-3100 h, the annual average temperature is 10.4 DEG C, the extreme maximum temperature is 40.6 DEG C, the extreme minimum temperature is -23.4 DEG C, the frost-free period is 180-224 d, the annual accumulated temperature equal to or greater than 10 DEG C is 3800-4700 DEG C, the annual average precipitation is 40-70 mm, and the annual average evaporation is greater than 2100 mm. The soil is sandy soil, and the pH value is 8.3 (which belongs to saline-alkali land), and the terrain is flat.

[0047] The following examples and comparative examples of the present application all adopt the cultivation mode of drip irrigation under the film and precision seeding on the film, and the cultivation and planting tests are performed continuously for 2 years from 2023 to 2024, and the planting area of each example and comparative example is 72 m 2 . The examples and comparative examples constitute a single-factor randomized block test design.

[0048] Example 1 (high-growth grass and sesbania herbacea S4C2 strip planting mode, and the schematic diagram of the planting mode is as shown in Figure 1 ​

[0049] A method for strip planting of high-salt sod and sesbania, comprising the following steps:

[0050] (1) Set the strip planting mode: the strip planting mode of high-salt sod and sesbania is 4 rows of high-salt sod + 2 rows of sesbania, that is, 4 rows of high-salt sod are planted on a high-salt sod planting strip, and 2 rows of sesbania are planted on a sesbania planting strip (i.e., the row ratio of high-salt sod and sesbania is 4:2), the high-salt sod planting strip and the sesbania planting strip are arranged alternately, and the row spacing of high-salt sod and sesbania is 60 cm, and the plant spacing is 15 cm, and the row spacing between high-salt sod and sesbania is also 60 cm.

[0051] (2) Sowing: on April 10, 2023, sowing of high-salt sod and sesbania is simultaneously carried out according to the set strip planting mode, and 320 kg·hm -2 of compound fertilizer (urea and diammonium phosphate, mass ratio of 3:1) is applied before sowing.

[0052] (3) Cultivation: cultivation is carried out at the grass germination stage and the seedling stage, and the soil depth is 15 cm.

[0053] (4) Water and fertilizer management: on April 10, sowing is carried out, and the first watering is carried out the next day, with a watering amount of 200 m 3 ·hm -2 ; the second watering is carried out on the fourth day after sowing, with a watering amount of 175 m 3 ·hm -2 , 1.5 kg / acre of wood vinegar is dripped, the third watering is carried out on the 50th day after sowing, with a watering amount of 900 m 3 ·hm -2 , 150 kg·hm -2 of urea and 75 kg·hm -2 of diammonium phosphate are applied; the fourth watering is carried out on the 65th day after sowing, with a watering amount of 750 m 3 ·hm -2 , 150 kg·hm -2 of urea is applied; the fifth watering is carried out on the 85th day after sowing, with a watering amount of 750 m 3 ·hm -2 , 150 kg·hm -2 of urea is applied; the sixth watering is carried out on the 90th day after sowing, with a watering amount of 750 m 3 ·hm -2 , 150 kg·hm -2 of urea is applied.

[0054] (5) First cutting and water and fertilizer management after the first cutting: the first cutting is carried out on July 20 (the growth conditions at the time of the first cutting are as follows Figure 2The first cutting: on August 20, the first cutting was carried out, and the high guangfusha and the field bean were mixed and cut at the same time. 3 ·hm -2 , and 150 kg·hm -2 of urea was applied.

[0055] The second cutting: on September 20, the second cutting was carried out, and the high guangfusha and the field bean were mixed and cut at the same time.

[0056] In 2024, after the soil was ploughed, the above steps in 2023 were repeated.

[0057] Comparative Example 1 (high guangfusha and field bean S2C2 strip planting mode, the planting mode schematic diagram is shown in Figure 1 )

[0058] The same as Example 1, the difference is only that the high guangfusha and field bean strip planting mode is set to 2 rows of high guangfusha + 2 rows of field bean, that is, 2 rows of high guangfusha are planted on one high guangfusha planting strip, and 2 rows of field bean are planted on one field bean planting strip (that is, the row ratio of high guangfusha and field bean is 2:2), and the high guangfusha planting strip and the field bean planting strip are arranged alternately.

[0059] Comparative Example 2 (high guangfusha and field bean S4C4 strip planting mode, the planting mode schematic diagram is shown in Figure 1 )

[0060] The same as Example 1, the difference is only that the high guangfusha and field bean strip planting mode is set to 4 rows of high guangfusha + 4 rows of field bean, that is, 4 rows of high guangfusha are planted on one high guangfusha planting strip, and 4 rows of field bean are planted on one field bean planting strip (that is, the row ratio of high guangfusha and field bean is 4:4), and the high guangfusha planting strip and the field bean planting strip are arranged alternately.

[0061] Comparative Example 3 (high guangfusha and field bean S6C4 strip planting mode, the planting mode schematic diagram is shown in Figure 1 )

[0062] The same as Example 1, the difference is only that the high guangfusha and field bean strip planting mode is set to 6 rows of high guangfusha + 4 rows of field bean, that is, 6 rows of high guangfusha are planted on one high guangfusha planting strip, and 4 rows of field bean are planted on one field bean planting strip (that is, the row ratio of high guangfusha and field bean is 6:4), and the high guangfusha planting strip and the field bean planting strip are arranged alternately.

[0063] Comparative Example 4 (high guangfusha monocropping, the planting mode is abbreviated as MS, the schematic diagram is shown in Figure 1 )

[0064] The same as Example 1, the difference is that only high guangfusha is monocropped, and the monocropping amount of high guangfusha is 10.14 kg·hm -2 , and the other operation steps are the same as those in Example 1.

[0065] Comparative Example 5 (mung bean monoculture, planting mode referred to as MC, schematic diagram as shown) Figure 1

[0066] The same as Example 1, except that only mung bean was monocultured, and the mung bean monoculture seeding amount was 11.4 kg·hm -2 , and other operation steps were the same as Example 1.

[0067] Comparative Example 6

[0068] Highland grass and silage corn strip planting (4:2), the steps were the same as Example 1, except that mung bean was replaced by silage corn.

[0069] Comparative Example 7 (silage corn monoculture)

[0070] The same as Example 1, except that only silage corn was monocultured, and the silage corn monoculture seeding amount was 45 kg·hm -2 , and other operation steps were the same as Example 1.

[0071] Test Example 1

[0072] Growth test of highland grass and mung bean

[0073] During the test, WPS 2023 was used to process data, and SPSS 27.0 analysis software was used for single factor (One-Way ANOVA) variance analysis, Duncan method was used for multiple comparisons, the results were expressed as mean ± standard error, P<0.05 indicated that the difference between different treatments was significant; Origin software was used to draw fresh grass yield graph and comprehensive analysis radar chart.

[0074] 1. Fresh grass yield and agronomic trait determination

[0075] (1) Test method

[0076] On July 20 (first crop) and September 20 (second crop) of each year, monoculture (Comparative Example 4 and Comparative Example 5) area of 4.6 m 2 (2 m x 2.3 m), strip planting mode area S2C2 (Comparative Example 1) of 6 m 2 (2 m x 3 m), S4C2 (Example 1) of 9.1 m 2 (2 m x 4.55 m), S4C4 (Comparative Example 2) of 12 m 2 (2 m x 6 m), S6C4 (Comparative Example 3) of 15.2 m 2 ​Each plot was cut from 10 cm above ground, and the fresh weight was measured, repeated 3 times. Meanwhile, 1 kg of fresh forage (sorghum sudan grass and / or sesbania) was randomly taken from each plot and dried for the determination of the conventional nutrient content, and the average value was taken.

[0077] Meanwhile, 10 single plants of sorghum sudan grass and sesbania were randomly selected from the part with uniform growth in each plot, and the natural height (height from the ground to the highest part of the plant), stem diameter (measured by digital vernier caliper from the second node to the middle of the third node from the ground), node number and total leaf number of sorghum sudan grass were determined, and the average value was calculated.

[0078] (2) Test results

[0079] The test results of the fresh forage yield of four crops in 2023 and 2024 under different planting modes of Example 1 and Comparative Examples 1-5 (the mixed fresh forage yield of sorghum sudan grass + sesbania under strip planting mode) are shown in Table 1. Figure 3 Table 1: Fresh forage yield of four crops in 2023 and 2024 under different planting modes Figure 3 It can be seen from Table 1 that strip planting can significantly increase the fresh forage yield, showing the trend of S4C2 > S2C2 > S4C4 > MS > S6C4 > MC, and the fresh forage yield of S4C2 is the highest, reaching 125.13 t·hm -2 (2023) and 129.20 t·hm -2 (2024), which is significantly increased by 20.56% and 13.79% (P < 0.05) compared with MS, and the average fresh forage yield of S4C2 in two years is 127.16 t·hm -2 , which is significantly increased by 17.03% (P < 0.05) compared with MS, and the average fresh forage yield of S2C2 and S4C4 in two years is 110.78 t·hm -2 and 110.68 t·hm -2 , which is increased by 1.95% and 1.86% compared with MS, and the fresh forage yield of S6C4 is 106.20 t·hm -2 , which is decreased by 2.26% compared with MS, and the fresh forage yield of the second crop is higher than that of the first crop in two years, and there is little difference in the fresh forage yield between 2024 and 2023.

[0080] The plant height test results of four crops of giant reed and sesbania between 2023 and 2024 under different planting modes are shown in Table 1.

[0081] Table 1 Influence of planting mode on plant height of giant reed and sesbania

[0082]

[0083] Note: Different letters in the same column indicate significant difference (P<0.05), and the same letter or no letter indicates no significant difference (P>0.05).

[0084] From Table 1, in two years and four crops, under S4C2 treatment, the plant height of giant reed was the most significant (P<0.05). In 2023, the plant height of the first crop of giant reed showed a trend of S4C2>MS>S4C4>S6C4>S2C2, and the plant height of sesbania showed a trend of S6C4>S4C2>MC>S2C2>S4C4. The plant height of giant reed under S4C2 treatment was significantly increased by 7.94% (P<0.05) compared with MS treatment. In the second crop, the plant height of giant reed showed a trend of S4C2>S2C2>MS>S4C4>S6C4, and the plant height of giant reed under S4C2 treatment was significantly increased by 17.16% (P<0.05) compared with MS treatment. There was no significant difference in the plant height of giant reed between the other strip treatments and MS, and the plant height of sesbania showed a trend of MC>S4C2>S4C4>S2C2>S6C4. In 2024, the plant height of the first crop of giant reed showed a trend of S4C2>S4C4>S6C4>MS>S2C2, and the plant height of giant reed under S4C2 treatment was significantly increased by 33.04% (P<0.05) compared with MS treatment. The plant height of sesbania showed a trend of S4C4>MC>S2C2>S4C2>S6C4. In the second crop, the plant height of giant reed showed a trend of S4C2>S2C2>S4C4>S6C4>MS, and the plant height of giant reed under S4C2 treatment was significantly increased by 8.91% (P<0.05) compared with MS treatment. The plant height of sesbania showed a trend of MC>S4C2>S2C2>S4C4>S6C4, and the strip planting mode was significantly lower than MC (P<0.05). However, under all strip planting modes in the second crop of the two years, the plant height of sesbania under S4C2 treatment was the highest. There was little difference in the plant height of giant reed and sesbania between years.

[0085] The agronomic trait test results of giant reed and sesbania in four crops between 2023 and 2024 under different planting modes are shown in Table 2.

[0086] Table 2 Influence of planting mode on agronomic traits of giant reed

[0087]

[0088] As shown in Table 2, the stem diameter, stem node number and leaf number of the two crops of high guinea grass in 2023 had significant differences (P<0.05). Among them, the stem diameter of high guinea grass in the first crop of S6C4 treatment was significantly higher than that of other treatments (P<0.05), which increased by 13.47% compared with MS treatment. The stem diameter of high guinea grass in the second crop of S4C4 treatment was significantly higher than that of other treatments (P<0.05), which increased by 67.47% compared with MS treatment. In the first crop, the stem node number of S2C2 treatment was the most, and the leaf number of S4C4 treatment was the most, which increased by 44.5% and 9.37% respectively compared with the first crop of MS treatment (P<0.05). In the second crop, the stem node number of S4C2 was the most, which increased by 23.86% compared with the second crop of MS treatment (P<0.05). The leaf number of all strip treatments was significantly reduced compared with MS (P<0.05). The stem diameter, stem node number and other agronomic characters of the second crop of high guinea grass were improved compared with the first crop. In 2024, the stem diameters of the two crops of high guinea grass had significant differences (P<0.05). The stem diameter of high guinea grass in the first crop of S2C2 treatment was the thickest, and the stem diameter of high guinea grass in the second crop of S6C4 treatment was the thickest, which increased by 45.83% and 22.62% respectively compared with the two crops of MS treatment (P<0.05). In the first crop, the stem node number of S4C2 treatment increased by 12.5% compared with the first crop of MS treatment (P<0.05), and the leaf number of S2C2 treatment was the most. In the second crop, the stem node number and leaf number had no significant difference (P>0.05). The stem diameter of the second crop was reduced compared with the first crop. The differences of the agronomic characters of high guinea grass between years were small.

[0089] In addition, the fresh grass yields of the two crops in 2024 in Example 1, Comparative Example 4, Comparative Example 6 and Comparative Example 7 were compared, and the results are shown in Table 3.

[0090] Table 3 Yield of different planting modes

[0091]

[0092] Note: The same column is compared, and different letters indicate significant difference.

[0093] As shown in Table 3, the fresh grass yield of the first crop of strip planting of high guinea grass and silage corn can reach 66.16 t·hm -2 , which is higher than that of single planting of silage corn and high guinea grass, but lower than that of strip planting of high guinea grass and sesbania. In addition, the second crop of corn cannot be regenerated, and the total annual yield of single planting of silage corn or strip planting of high guinea grass and silage corn decreases obviously. In addition, the salt and alkali tolerance of silage corn is not as good as that of high guinea grass and sesbania, which leads to yield reduction.

[0094] Therefore, based on the above disadvantages of planting forage grass in saline-alkali land, the present application develops a high sorghum and sesbania zeggar strip planting technology, which can be planted in both light and moderate saline-alkali land, has strong adaptability to saline-alkali land, strong forage grass regeneration ability, and the regeneration speed of the two forage grass varieties is equivalent, and proper row ratio planting can form the maximum marginal benefit, and the yield of the produced forage grass is high and the quality is excellent.

[0095] 2. Conventional nutrient determination of forage grass

[0096] (1) Test method

[0097] The natural air-dried forage grass (high sorghum + sesbania zeggar mixed forage grass in strip planting mode) is crushed by a crusher and passed through a 40 mesh screen. The crude protein (Crude protein, CP), ether extract (Ether extract, EE), neutral detergent fiber (Neutral detergent fiber, NDF) and acid detergent fiber (Acid detergent fiber, ADF), and crude ash (Crude ash, Ash) contents of the forage grass are determined according to the "Quality Inspection Methods and Quality Management of Feed and Feed Additives". Repeat 3 times, take the average value.

[0098] (2) Test results

[0099] The test results of the nutritional components of the mixed forage grass of high sorghum and sesbania zeggar under different planting modes in 2023 and 2024 are shown in Table 4:

[0100] Table 4 Effect of different planting modes on forage nutrients

[0101]

[0102] Note: The nutrient content of each treatment in the first crop is the average value of the first crop in 2023 and the first crop in 2024; the nutrient content of each treatment in the second crop is the average value of the second crop in 2023 and the second crop in 2024; the interannual difference in the first crop, the value in 2023 is the average value of the first crop of each treatment in 2023, and the value in 2024 is the average value of the first crop of each treatment in 2024; the interannual difference data of the second crop is the same as that of the first crop.

[0103] From Table 4, the CP content of mixed forage in each strip planting treatment was significantly higher than that in MS treatment (P<0.05) in the first cutting of two years, showing the trend of MS<S2C2<S4C2<S6C4<S4C4<S4C4<MC, the EE content was higher than that in MS, and was significantly higher than that in MC treatment (P<0.05), the ADF and Ash contents were significantly increased compared with MS treatment (P<0.05), and there was no significant difference in NDF among treatments (P>0.05); there was no significant difference in CP, EE, ADF and NDF contents of the first cutting forage between two years. In the second cutting of two years, the CP content of mixed forage in each strip planting treatment was significantly higher than that in MS treatment (P<0.05), showing the trend of MS<S6C4<S2C2<S4C2<S4C4<S4C4<MC, the EE content was higher than that in MS and MC treatment, the ADF, NDF and Ash contents were significantly increased compared with MS / MC treatment (P<0.05); the CP and Ash contents of the second cutting forage in 2024 were significantly lower than those in 2023 (P<0.05), and there was no significant difference in EE and ADF, NDF contents (P>0.05).

[0104] 3. Determination of total volatile fatty acid (TVFA) and calculation of dry matter disappearance rate (DMD)

[0105] (1) Test method

[0106] Take 1.0 g of substrate (mixed forage of sorghum-sudan and sesbania in strip planting mode) and put it into a 145 mL fermentation bottle. Preheat in a constant temperature incubator at 39.5°C. Take out the fermentation bottle and pass in CO2 to ensure an anaerobic environment in the fermentation bottle. Add 60 mL of artificial rumen microbial nutrient solution to each fermentation bottle and place the fermentation bottle in the constant temperature incubator to simulate goat rumen fermentation. After 72 h of fermentation, measure the pH of the fermentation broth with a pH meter (LE407 pH Sensor, Ray Magnet). Take 0.6 mL of supernatant and place it in a test bottle. Use a gas chromatograph (TRACE 1310, USA Thermo) to measure the peak area of each volatile fatty acid in the fermentation broth sample. Calculate the concentration of each volatile fatty acid according to the standard curve. The method is described in "Wang M, Sun X Z, Janssen P H, et al. Responses of methane production and fermentation pathways to the increased dissolved hydrogen concentration generated by eight substrates in vitro ruminal cultures [J]. Animal Feed Science and Technology, 2014, 194:1-11". The remaining fermentation broth is filtered with 300 mesh nylon gauze and placed in an aluminum box. Dry at 105°C until constant weight. Calculate the dry matter disappearance rate of the sample according to formula (1).

[0107] (1)

[0108] (2) Test results

[0109] The test results of TVFA and DMD of four crops of sorghum-sudan and sesbania in different planting modes in 2023 and 2024 are shown in Table 5:

[0110] Table 5 Effect of different planting modes on forage quality

[0111]

[0112] Note: The data in each treatment is the average of four crops in 2023 and 2024. In the interannual difference, the value in 2023 is the average of two crops in 2023, and the value in 2024 is the average of two crops in 2024. LOS represents the level of significance; SEM represents the standard error of the mean.

[0113] From Table 5, it can be seen that the strip planting pattern significantly affected the VFA content and DMD in mixed forage grass (P<0.05). The acetic acid, isobutyric acid, butyric acid, isovaleric acid, valeric acid, and total volatile fatty acid concentrations in the fermentation liquid after 72 h of in vitro fermentation of S6C4 were the lowest. Under different strip planting patterns, S4C2 had the highest acetic acid, propionic acid, valeric acid, TVFA content, and DMD. Compared with MS, TVFA and DMD increased by 3.80% and 19.30%, respectively (P<0.05). MS had the highest isobutyric acid, butyric acid, and isovaleric acid contents. The pH values were significantly different among the various planting patterns (P<0.05), with MC being the highest and S4C2 being the lowest at 6.08. Compared with 2023, TVFA and DMD significantly decreased by 5.83% and 12.79%, respectively, in 2024 (P<0.05).

[0114] 4. Land equivalent ratio (LER) determination

[0115] (1) Test method

[0116] LER represents the yield ratio of intercropping two or more crops in the same farmland to the yield of net cropping. When LER>1, it indicates intercropping advantage, i.e., intercropping is more efficient than net cropping. LER is calculated according to formula (2).

[0117] (2)

[0118] In the formula, Y is and Y ic are the yields of giant reed and sesbania in the total area under strip planting, and Y ms and Y mc are the yields of giant reed (S) and sesbania (C) under monocropping, respectively. When LER>1, intercropping has an advantage, and when LER<1, intercropping has no advantage.

[0119] (2) Test results

[0120] The test results of LER of giant reed and sesbania under different planting patterns in 2023 and 2024 are shown in Table 6:

[0121] Table 6 Comparison of LER of giant reed and sesbania under different planting patterns

[0122]

[0123] From Table 6, in all the strip planting mode systems of different row ratios of high-sweet sorghum and sesbania, the LERs were greater than 1, which indicated that the yield of the strip planting treatment was better than that of the high-sweet sorghum and sesbania monoculture. The LERs of the second crop in 2023 were higher than those of the first crop; in 2024, the LER of the S4C2 treatment in the second crop was slightly lower than that in the first crop, and the LERs of the other treatments increased; the annual average LERs of the different row ratio strip planting mode showed the trend of S4C2 > S4C4 > S6C4 > S2C2, with the maximum LER of S4C2 being 1.23; there was no significant difference in the LERs between years.

[0124] 5. Comprehensive analysis of forage yield and quality

[0125] (1) Analysis method

[0126] Ten groups of data, including the average fresh forage yield, CP, EE, ADF, NDF, Ash, TVFA, and DMD of each treatment in four crops over two years, were used as evaluation indexes for the comprehensive analysis of the monoculture mode and the different row ratio strip planting mode. The data were standardized according to formulas (3) and (4).

[0127] (3)

[0128] (4)

[0129] In the formula, r ij is the original data of each evaluation index; r0 is the optimal value of the jth neutral evaluation index established according to the target and the actual production situation; R ij is the value after standardization of the evaluation index.

[0130] Comprehensive evaluation value calculation: the coefficient of variation C i value and the weight W i value of each evaluation index were calculated by formulas (5) and (6); the angle θ i between each evaluation index and the adjacent two indexes α i was calculated according to formulas (7) and (8); and the area S of the polygon radar chart formed by each evaluation index was calculated according to formulas (9) and (10). The greater the value, the stronger the overall advantage of the variety, and vice versa.

[0131] (5)

[0132] (6)

[0133] (7)

[0134] (8)

[0135] (9)

[0136] (10)

[0137] wherein, C i 、 σ 、 R are the coefficient of variation, the standard deviation, and the average value of the i-th agronomic trait evaluation index, respectively; n is the number of evaluation indices; W i and θ i are the weight and the corresponding angle of the i-th agronomic trait evaluation index, respectively, i α i is the angle between the adjacent two indices (and i j ); S is the area of the polygon radar chart; L is the perimeter of the polygon radar chart; i and j are two adjacent evaluation indices.

[0138] (2) Test results

[0139] The average values of the fresh grass yield, nutrient quality, and other indices of each treatment of four crops in two years were comprehensively analyzed, and the radar chart drawn according to the standardized data of the treatment is shown in Figure 4 Among the six treatments, the area surrounded by the radar chart of each strip planting treatment is relatively complete, indicating that the strip planting mode is superior to the single planting mode; the greater the area value of each planting mode in the radar chart analysis data, the better the yield of the proportional planting mode, and the result is S4C2>S2C2>S6C4>S4C4>MS>MC, indicating that S4C2 is the best strip planting proportion.

[0140] 6. Results analysis

[0141] (1) Effect of planting mode on fresh grass yield and agronomic traits of sorghum-sudan grass and Sesbania cannabina

[0142] The strip planting mode significantly increased the plant height of sorghum-sudan grass and Sesbania cannabina (P<0.05), and the two-year average total fresh grass (mixed fresh grass) yield of S4C2 reached 127.16 t·hm -2 ​​The fresh grass yield of 2024 increased by 4.15% compared with 2023; with the increase of strip planting row ratio, the forage yield did not always increase, such as the fresh grass yield of S6C4 was lower than that of S4C2, which was due to the intercropping of gramineous and legume forage could play the role of niche complementation, fully exert the marginal effect, make full use of land and light and heat resources to improve photosynthetic efficiency; but when the planting ratio further increased, the marginal effect would gradually decrease, causing the photosynthesis of high-sugar cane and sesame to decrease, resulting in a certain degree of yield decline. Therefore, the intercropping of high-sugar cane and sesame should choose the appropriate row ratio mode.

[0143] (2) The effect of planting pattern on the quality of high-sugar cane and sesame forage

[0144] The CP and Ash content of mixed forage in strip planting of high-sugar cane and sesame increased compared with MS treatment. Since sesame is a legume, the CP content is high, which increases the CP content. The long time of wind and dust in the south of Xinjiang increases the Ash content of forage. The ADF and NDF content of mixed forage is slightly higher than that of single planting control group.

[0145] In vitro fermentation is a method for evaluating the digestibility of feed. Gas production reflects the degree of feed fermentability and rumen microbial activity. The higher the nutritional value of feed, the stronger the fermentation activity of microorganisms, and the higher the gas production. Under S4C2 treatment, TVFA and DMD were the highest. DMD is an important indicator for evaluating the nutritional value of forage, and its digestion and degradation degree is proportional to the nutritional value of forage. It is also an indicator reflecting the degree of feed degradation in the digestive tract. The higher the value, the easier the forage is digested in the rumen, and the greater the dry matter intake of animals. In this study, the DMD under different strip planting patterns was 44.99~53.65%, which was higher than that of single planting of high-sugar cane; but TVFA was only higher than MS under S4C2 treatment, and its value gradually decreased to 116.99mmol·L -1 , which was much lower than MS, indicating that the digestibility of forage under S4C2 strip planting pattern was the best.

[0146] (3) The effect of planting pattern on land equivalent ratio

[0147] Land equivalent ratio is an important indicator to measure land use efficiency. The land equivalent ratio LER of high-sugar cane and sesame under strip planting pattern is greater than 1, which has significant production advantage, and the land productivity is significantly improved. The land equivalent ratio LER of S4C2 treatment is the largest, and the yield advantage is stronger. The LER of the second crop is higher than that of the first crop, and the second year is higher than the first year. It can be seen that strip planting is beneficial to improve the land productivity.

[0148] In summary, the strip planting mode can improve the yield and quality of forage grass. Through comprehensive evaluation and analysis, the total fresh grass yield and nutrient quality of forage grass reach the optimal value at S4C2. Therefore, in the Alar region of Xinjiang (saline-alkali region), the seeds can be sown according to the S4C2 mode of high-sugar sorghum and sesbania, which can effectively improve the total yield and quality of forage grass and achieve the goal of increasing economic benefits.

[0149] Test Example 2

[0150] Soil improvement test

[0151] The soil improvement test was conducted on the four cuttings of Example 1 and Comparative Example 6 in 2023 and 2024. The soil condition before the planting test was used as a control. The soil conditions of Example 1 and Comparative Example 6 were consistent before the planting test.

[0152] (1) Determination of soil pH, conductivity and water-soluble salt ion content

[0153] The air-dried soil sample was ground and sieved (2 mm). The soil suspension sample was prepared according to the mass ratio of water to soil of 5:1. The soil pH value was determined using a BPH-252 pH meter, and the conductivity was determined using a Shanghai Raymag conductivity meter. Each group was repeated three times. The water-soluble salt ion content of the soil was determined. First, the concentration of carbonate ions was determined using phenolphthalein indicator. Then, all the carbonate ions were neutralized to bicarbonate ions using standard acid. After that, the concentration of chloride ions was titrated using silver nitrate reagent. The concentration of sulfate ions was determined using EDTA volumetric method. First, the SO4 2- was precipitated completely by adding excess BaCl2 to the solution. Then, EDTA was used as an indicator for titration. The concentrations of calcium and magnesium were determined by EDTA complexometric titration. EDTA can form stable complexes with calcium and magnesium ions. The concentrations of potassium and sodium were determined by flame photometry.

[0154] The variance analysis of soil water-soluble salt ion content, pH and conductivity was performed, and the results are shown in Table 7.

[0155] Table 7 Soil eight ions, pH and conductivity

[0156]

[0157] Note: The data in Table 7 are the results of testing the soil taken from the high-sugar sorghum planting strip, the sesbania planting strip and the silage corn planting strip, respectively.

[0158] As shown in Table 7, the strip planting mode of S4C2 can significantly reduce the content of soil eight ions, pH and conductivity.

[0159] (2) Determination of soil invertase activity and carbon components

[0160] The soil sucrose activity was determined by 3,5-dinitrosalicylic acid colorimetry, expressed as the milligrams of glucose per gram of soil within 24 hours under the action of sucrose at 37°C [mg / (g·24h) C6H6O6, mg / g]; the soil urease activity was determined by sodium phenolate colorimetry, expressed as the milligrams of NH3-N per gram of soil within 48 hours under the action of urease at 37°C [mg / (g·48h) NH3-N, mg / g]; and the soil catalase activity was determined by potassium permanganate titration, expressed as the volume of 0.1 mol / L KMnO4 consumed per gram of soil within 24 hours under the action of catalase (mL / g).

[0161] The soil light fraction organic carbon (LFOC) was determined by NaI density separation method (Zhang et al., 2007), the dissolved organic carbon (DOC) was determined by wet oxidation method, the particulate organic carbon (POC) was determined by sodium hexametaphosphate dispersion method (Cambardella et al., 1992), and the easily oxidizable organic carbon (EOC) was determined by potassium permanganate oxidation-colorimetry method (Blair et al., 1995). The soil microbial biomass carbon (MBC) and nitrogen (MBN) were determined by chloroform fumigation-K2SO4 extraction method, and the soil nitrate nitrogen was determined according to the method of Lu Rukun (2000). The soil particulate organic nitrogen (PON) was determined by 5 g / L sodium hexametaphosphate dispersion method, the dissolved organic nitrogen (DON) was determined by 0.5 mol / L potassium sulfate leaching method, and the light fraction organic nitrogen (LFON) content was determined by light fraction separation method (Liu et al., 2015).

[0162] The results of determination of soil enzyme and carbon components are shown in Table 8.

[0163] Table 8 Soil enzyme and carbon components

[0164]

[0165] Note: The data in Table 8 are the results of testing the soil taken from the high-sweet sorghum planting zone, the soybean planting zone and the silage corn planting zone, respectively.

[0166] As shown in Table 8, the strip planting of high-sweet sorghum and soybean can change the soil enzyme activity and soil carbon components of saline-alkali soil, and the effect is better than that of strip planting of high-sweet sorghum and silage corn.

[0167] (3) Determination of soil bacterial diversity

[0168] Bacterial DNA extraction, amplification and sequencing: soil samples were transported on dry ice to Novogene Bioinformatics Technology Co., Ltd. for sequencing. 0.5 g of soil was weighed and genomic DNA was extracted using a magnetic bead method soil and fecal genomic DNA extraction kit. After extraction, the DNA purity and concentration were detected using a 1% agarose gel electrophoresis, and the genomic DNA sample was diluted to 1 ng·μL -1 and 1 μL of the diluted genomic DNA sample was used for amplification with the primer sequence 515F (5'-CCTAYGGGRBGCASCAG-3') for prokaryotic 16S rDNA, and then PE 250 sequencing was performed using NovaSeq 6000; dada2 method in QIIME2 2020.6 was used for denoising to obtain the final ASVs (i.e. amplicon sequence variants), and the database was Silva 138.1. The test results are shown in Table 9.

[0169] Table 9 Soil bacterial diversity

[0170]

[0171] As can be seen from Table 9, the strip planting of high-sugar corn and sesbania can increase the Chao1 index and pielou-E index, and can increase the microbial diversity index.

[0172] The above-described embodiments are only descriptions of the preferred modes of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A method for strip planting of sorghum and sesbania in saline-alkali soil, characterized in that: On saline-alkali land, sorghum and sesbania were planted in strips with a pattern of 4 rows of sorghum + 2 rows of sesbania; The strip planting of sorghum and sesbania adopts the dry sowing and wet out cultivation method of drip irrigation under the film and precision sowing on the film; The sorghum and the sesbania are sown and mowed simultaneously; The mowing is carried out twice a year; After sowing, the water and fertilizer management step is also included. The water and fertilizer management includes: dripping water 6 times from the sowing day to the heading period before the first mowing, with a total dripping volume of 3525 m 3 ·hm -2 , topdressing is carried out at the same time as dripping water, specifically: the first dripping watering is carried out on the day after sowing, with a dripping volume of 200 m 3 ·hm -2 ; The second dripping was carried out on the 4th day after sowing, with a dripping volume of 175 m 3 ·hm -2 , drip irrigation 1-2kg / mu wood vinegar; the third drip irrigation is carried out 45-60 days after sowing, with a dripping volume of 900 m 3 ·hm -2 , urea 150kg·hm -2 and diammonium phosphate 75 kg·hm -2 ; The fourth dripping was carried out on the 61st to 70th day after sowing, with a dripping volume of 750 m 3 ·hm -2 , urea 150 kg·hm -2 ; The fifth dripping was carried out on the 80th to 90th day after sowing, with a dripping volume of 750 m 3 ·hm -2 , urea 150 kg·hm -2 ; The sixth dripping was carried out on the 91st to 100th day after sowing, with a dripping volume of 750 m 3 ·hm -2 , urea 150 kg·hm -2 After the first mowing, water and fertilize once every 15 to 20 days, with a watering rate of 750 m3 each time. 3 ·hm -2 , urea 225 kg·hm -2 .

2. The strip planting method of sorghum and sesbania in saline-alkali land according to claim 1, characterized in that: The row spacing of the sorghum is 60 cm, and the plant spacing is 15 cm; the row spacing of the sesbania is 60 cm, and the plant spacing is 15 cm; the row spacing between the sorghum and the sesbania is 60 cm.

3. The strip planting method of sorghum and sesbania in saline-alkali land according to claim 1, characterized in that: The sowing is carried out in spring or summer.

4. The strip planting method of sorghum and sesbania in saline-alkali land according to claim 1, wherein: Apply 320 kg·hm of compound fertilizer before sowing -2 .

5. The strip planting method of sorghum and sesbania in saline-alkali land according to claim 1, wherein: After sowing, the method further comprises the step of tilling the soil, wherein the tilling comprises: tilling the soil during the germination stage and the seedling stage of sorghum and sesbania, with the soil depth being 10-15 cm.

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