Ploughing cultivation applicability evaluation method based on comprehensive soil fertility of salinized soil

Abstract

The invention discloses a saline soil comprehensive soil fertility-based cultivated land cultivation applicability evaluation method, which comprises the following steps: respectively obtaining a soil total salt content index, a soil organic matter content index, a soil total nitrogen content index, a soil available phosphorus content index, a soil available potassium content index, a soil natural water content index and a soil bulk density index according to indoor tests; and according to the obtained soil fertility index information related to the surface soil of the cultivated land, defining a saline soil cultivated land cultivation applicability contribution degree index model, and applying the saline soil cultivated land cultivation applicability contribution degree index model to complete cultivation applicability evaluation of the target saline soil cultivated land. According to the method, the comprehensive soil fertility of the salinized soil cultivated land is quantitatively evaluated, the evaluation system of the comprehensive soil fertility of the salinized soil cultivated land is enriched, and the comprehensive soil fertility index and the cultivation applicability of the salinized soil cultivated land are further accurately, rapidly and effectively evaluated.

Description

Technical Field

[0001] The invention relates to the technical field of agriculture, and in particular to a method for evaluating the suitability of cultivated land based on the comprehensive land productivity of saline soil. Background Art

[0002] Saline soil is formed due to excessive accumulation of soluble salts on the soil surface, which is harmful to the growth of crops. Its essence is that various soluble salts are redistributed horizontally or vertically on the ground, causing a large amount of salt to accumulate on the soil surface. At the same time, factors such as climate, farming technology, and rising groundwater levels can all lead to soil salinization.

[0003] Generally speaking, the saline soil in the area has a flat terrain, deep soil layer, suitable for mechanized farming, and potential fertility, which is an extremely precious land resource. By developing and utilizing saline soil farmland, we can not only expand the cultivated land area, increase the yield per unit area of ​​crops, increase the total grain output, and relieve food pressure; we can also expand the greening area, improve the ecological environment and improve the living standards of residents. Therefore, the targeted improvement of saline soil is the focus of scholars at home and abroad. At the same time, it is an urgent task to establish a feasible, comprehensive, fast and accurate evaluation method for the suitability of saline soil farmland for cultivation. Summary of the invention

[0004] The purpose of the present invention is to provide a method for evaluating the suitability of cultivated land based on the comprehensive soil productivity of saline soil, to quantitatively evaluate the comprehensive soil productivity of saline soil cultivated land, to enrich the evaluation system for the suitability of cultivated land with saline soil, and to further accurately and quickly evaluate the suitability of cultivated land with saline soil effectively.

[0005] In order to achieve the above functions, the present invention designs a method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land efficiency of saline soil. For the target saline soil cultivated land, the following steps S1 to S8 are performed to complete the evaluation of the suitability for cultivation:

[0006] Step S1: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil total salt index a;

[0007] Step S2: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil organic matter content index b;

[0008] Step S3: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil total nitrogen content index c;

[0009] Step S4: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil available phosphorus content index d;

[0010] Step S5: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil available potassium content index e;

[0011] Step S6: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil natural moisture index f;

[0012] Step S7: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil bulk density index g;

[0013] Step S8: According to the soil total salt index a, soil organic matter content index b, soil total nitrogen content index c, soil available phosphorus content index d, soil available potassium content index e, soil natural moisture index f, and soil bulk density index g, a saline soil farmland cultivation suitability contribution index model is constructed, and the saline soil farmland cultivation suitability contribution index model is applied to complete the cultivation suitability evaluation of the target saline soil farmland.

[0014] Beneficial effects: Compared with the prior art, the advantages of the present invention include:

[0015] The present invention provides a method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil. A contribution index model for the suitability of cultivated land for cultivation of saline soil is established based on multiple dimensions, and a quantitative evaluation is performed on the comprehensive land productivity of saline soil cultivated land. This enriches the evaluation system for the suitability of cultivated land for cultivation of saline soil, and further accurately, quickly and comprehensively evaluates the suitability of cultivated land for cultivation of saline soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of a method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land efficiency of saline soil provided in an embodiment of the present invention;

[0017] Figure 2 It is a framework diagram of a method for evaluating the suitability of cultivated land based on the comprehensive land productivity of saline soil provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] The embodiment of the present invention provides a method for evaluating the suitability of cultivated land for cultivation based on the comprehensive soil fertility of saline soil. Figure 1 , Figure 2 , execute the following steps S1 to S8 to complete the farming suitability evaluation:

[0020] Step S1: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil total salt index a;

[0021] The specific steps of step S1 are as follows:

[0022] Step S1.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained;

[0023] Step S1.2: Soil from 20 points on the surface of the target saline soil farmland at a depth of 20 cm is respectively dug and mixed into a sample to be tested;

[0024] Step S1.3: Determine the total salt content S of the soil of the sample to be tested by the drying weight method;

[0025] Step S1.4: assigning a score to the soil total salt index a according to the value of the soil total salt content S;

[0026] The soil total salt index a is determined according to the numerical value of the soil total salt content S. When the soil total salt content is 0<S≤3g / kg, the soil total salt index a=100; when the soil total salt content is 3<S≤6g / kg, the soil total salt index a=50; when the soil total salt content is 6<S≤10g / kg, the soil total salt index a=25; when the soil total salt content is 10<S≤20g / kg, the soil total salt index a=0.

[0027] Step S2: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil organic matter content index b;

[0028] The specific steps of step S2 are as follows:

[0029] Step S2.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained;

[0030] Step S2.2: Soil from 20 points on the surface of the target saline soil farmland at a depth of 20 cm is respectively dug and mixed into a sample to be tested;

[0031] Step S2.3: Determine the organic matter content OM of the sample to be tested by dry burning method;

[0032] Step S2.4: assigning points to the soil organic matter content index b according to the value of the soil organic matter content OM;

[0033] The soil organic matter content index b is determined according to the numerical value of the soil organic matter content OM. When the soil organic matter content is 0<OM≤1%, the soil organic matter content index b=10; when the soil organic matter content is 1%<OM≤2%, the soil organic matter content index b=20; when the soil organic matter content is 2%<OM≤3%, the soil organic matter content index b=30; when the soil organic matter content is 3%<OM≤4%, the soil organic matter content index b=40; when the soil organic matter content is 4%<OM≤5%, the soil organic matter content index b=50. The soil organic matter content index b=50; when the soil organic matter content is 5%<OM≤6%, the soil organic matter content index b=60; when the soil organic matter content is 6%<OM≤7%, the soil organic matter content index b=70; when the soil organic matter content is 7%<OM≤8%, the soil organic matter content index b=80; when the soil organic matter content is 8%<OM≤9%, the soil organic matter content index b=90; when the soil organic matter content is 9%<OM≤10%, the soil organic matter content index b=100.

[0034] Step S3: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil total nitrogen content index c;

[0035] The specific steps of step S3 are as follows:

[0036] Step S3.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained;

[0037] Step S3.2: Soil from 20 points on the surface of the target saline soil farmland at a depth of 20 cm is respectively dug and mixed into a sample to be tested;

[0038] Step S3.3: Determine the total nitrogen content N in the soil by semi-micro Kjeldahl method;

[0039] Step S3.4: assigning a score to the soil total nitrogen content index c according to the value of the soil total nitrogen content N;

[0040] The soil total nitrogen content index c is determined according to the numerical value of the soil total nitrogen content N. When the soil total nitrogen content is 0<N≤0.1%, the soil total nitrogen content index=0; when the soil total nitrogen content is 0.1%<N≤0.125%, the soil total nitrogen content index=25; when the soil total nitrogen content is 0.125%<N≤0.15%, the soil total nitrogen content index c=50; when the soil total nitrogen content is 0.15%<N≤0.175%, the soil total nitrogen content index=75; when the soil total nitrogen content is 0.175%<N≤0.2%, the soil total nitrogen content index=100; when the soil total nitrogen content N>0.2%, the soil total nitrogen content index=0.

[0041] Step S4: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil available phosphorus content index d;

[0042] The specific steps of step S4 are as follows:

[0043] Step S4.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained;

[0044] Step S4.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested;

[0045] Step S4.3: Determine the soil available phosphorus content P by sodium bicarbonate extraction method;

[0046] Step S4.4: assigning a score to the soil available phosphorus content index d according to the value of the soil available phosphorus content P;

[0047] The soil available phosphorus content index d is determined according to the numerical value of the soil available phosphorus content P. When the soil available phosphorus content is 0<P≤0.01%, the soil available phosphorus content index d=0; when the soil available phosphorus content is 0.01%<P≤0.02%, the soil available phosphorus content index d=25; when the soil available phosphorus content is 0.02%<P≤0.03%, the soil available phosphorus content index d=50; when the soil available phosphorus content is 0.03%<P≤0.04%, the soil available phosphorus content index d=75; when the soil available phosphorus content is 0.04%<P≤0.05%, the soil available phosphorus content index d=100; when the soil available phosphorus content P>0.05%, the soil available phosphorus content index d=0.

[0048] Step S5: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil available potassium content index e;

[0049] The specific steps of step S5 are as follows:

[0050] Step S5.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained;

[0051] Step S5.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested;

[0052] Step S5.3: Determine the available potassium content K in the soil by ammonium acetate extraction-flame photometry;

[0053] Step S5.4: assigning a score to the soil available potassium content index e according to the value of the soil available potassium content K;

[0054] The soil available potassium content index e is determined according to the numerical value of the soil available potassium content K. When the soil available potassium content is 0<P≤1%, the soil available potassium content index e=0; when the soil available potassium content is 1%<P≤1.25%, the soil available potassium content index e=25; when the soil available potassium content is 1.25%<P≤1.5%, the soil available potassium content index e=50; when the soil available potassium content is 1.5%<P≤1.75%, the soil available potassium content index e=75; when the soil available potassium content is 1.75%<P≤2%, the soil available potassium content index e=100; when the soil available potassium content K>2%, the soil available potassium content index e=0.

[0055] Step S6: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil natural moisture index f;

[0056] The specific steps of step S6 are as follows:

[0057] Step S6.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained;

[0058] Step S6.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested;

[0059] Step S6.3: Determine the natural soil moisture w by the ring knife method;

[0060] Step S6.4: assigning a score to the soil natural moisture index f according to the value of the soil natural moisture w;

[0061] The natural soil moisture index f is determined according to the numerical value of the natural soil moisture content w. When the natural soil moisture content is 0<w≤10%, the natural soil moisture index f=0; when the natural soil moisture content is 10%<w≤20%, the natural soil moisture index f=25; when the natural soil moisture content is 20%<w≤30%, the natural soil moisture index f=50; when the natural soil moisture content is 30%<w≤40%, the natural soil moisture index f=100; when the natural soil moisture content w>40%, the natural soil moisture index f=0.

[0062] Step S7: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil bulk density index g;

[0063] The specific steps of step S7 are as follows:

[0064] Step S7.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained;

[0065] Step S7.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested;

[0066] Step S7.3: Determine the soil bulk density ρ by the ring knife method;

[0067] Step S7.4: assigning points to the soil bulk density index g according to the value of the soil bulk density ρ;

[0068] The soil bulk density index g is determined according to the value of the soil bulk density ρ. When the soil bulk density is 1g / cm 3 <ρ≤1.1g / cm 3 When the soil bulk density index is g = 100; when the soil bulk density is 1.1 g / cm 3 <ρ≤1.2g / cm 3 When the soil bulk density index g = 75; when the soil bulk density is 1.2g / cm 3 <ρ≤1.3g / cm 3 When the soil bulk density index g = 50; when the soil bulk density is 1.3g / cm 3 <ρ≤1.4g / cm 3 When the soil bulk density index g = 25; when the soil bulk density ρ> 1.4g / cm 3 When the soil bulk density index g=0.

[0069] Step S8: According to the soil total salt index a, soil organic matter content index b, soil total nitrogen content index c, soil available phosphorus content index d, soil available potassium content index e, soil natural moisture index f, and soil bulk density index g, a saline soil farmland cultivation suitability contribution index model is constructed, and the saline soil farmland cultivation suitability contribution index model is applied to complete the cultivation suitability evaluation of the target saline soil farmland.

[0070] The saline soil farmland cultivation suitability contribution index model described in step S8 is as follows:

[0071] SSCCI=0.3×a+0.2×b+0.1×c+0.1×d+0.1×e+0.1×f+0.1×g

[0072] Among them, SSCCI is the contribution index of saline soil farmland to cultivation suitability. The larger the SSCCI value, the higher the suitability of saline soil farmland for cultivation.

[0073] The evaluation method for the suitability of target saline soil farmland for cultivation is as follows:

[0074] When SSCCI∈(0,20], the suitability of saline soil for cultivation is poor;

[0075] When SSCCI∈(20,40], the suitability of saline soil for cultivation is poor;

[0076] When SSCCI∈(40,60], the suitability of saline soil for cultivation is ordinary;

[0077] When SSCCI∈(60,80], the saline soil is well suitable for cultivation;

[0078] When SSCCI∈(80,100], the suitability of saline soil for cultivation is excellent.

[0079] The saline soil arable land cultivation suitability contribution index SSCCI is shown in Table 1:

[0080] Table 1 Saline soil farmland cultivation suitability contribution index SSCCI

[0081] Suitability of saline soil for cultivation Difference Poor ordinary good excellent SSCCI (0,20] (20,40] (40,60] (60,80] (80,100]

[0082] The following is an application embodiment of the present invention:

[0083] Taking a saline soil farmland in Xinjiang Uygur Autonomous Region as an example, the technical solution of the present invention is further explained:

[0084] 1. By collecting soil samples on site, the total salt content of the soil S = 1g / kg is determined by the drying weight method, and the soil total salt index a = 100 is obtained according to the scoring rule.

[0085] 2. By collecting soil samples on site, the soil organic matter content OM=8.5% was determined by the dry burning method, and the soil organic matter content index b=90 was obtained according to the scoring rule.

[0086] 3. By collecting soil samples on site, the semi-micro Kjeldahl method was used to determine the total nitrogen content of the soil N = 0.17%, and the soil total nitrogen content index c = 75 was obtained according to the scoring rule.

[0087] 4. By collecting soil samples on site, the soil available phosphorus content P = 0.035% was determined by sodium bicarbonate extraction method, and the soil available phosphorus content index d = 75 was obtained according to the scoring rule.

[0088] 5. By collecting soil samples on site, the soil available potassium content K = 1.6% was determined by ammonium acetate extraction-flame photometry, and the soil available potassium content index e = 75 was obtained according to the scoring rule.

[0089] 6. By collecting soil samples on site, the natural soil moisture content w = 30% was determined using the ring knife method, and the natural soil moisture index f = 50 was obtained based on the scoring rule.

[0090] 7. Collect soil samples on site and use the ring knife method to measure the soil bulk density ρ = 1.15g / cm 3 According to the scoring rule, the soil bulk density index g=75 is obtained.

[0091] 8. According to the acquired information on the soil fertility index of the surface soil of the cultivated land, the contribution index of the cultivation suitability of the saline soil cultivated land SSCCI was determined as SSCCI = 0.3×100+0.2×90+0.1×75+0.1×75+0.1×75+0.1×50+0.1×75=75.5. According to Table 1, the cultivation suitability of the saline soil cultivated land is good.

[0092] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil, characterized in that: For the target saline soil farmland, perform the following steps S1 to S8 to complete the evaluation of farming suitability: Step S1: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil total salt index a; Step S2: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil organic matter content index b; Step S3: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil total nitrogen content index c; Step S4: Collect the sample to be tested, and conduct indoor testing on the sample to be tested to obtain the soil available phosphorus content index d; Step S5: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil available potassium content index e; Step S6: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil natural moisture index f; Step S7: Collect the sample to be tested, and perform indoor testing on the sample to be tested to obtain the soil bulk density index g; Step S8: According to the soil total salt index a, soil organic matter content index b, soil total nitrogen content index c, soil available phosphorus content index d, soil available potassium content index e, soil natural moisture index f, and soil bulk density index g, a saline soil farmland cultivation suitability contribution index model is constructed, and the saline soil farmland cultivation suitability contribution index model is applied to complete the cultivation suitability evaluation of the target saline soil farmland.

2. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The specific steps of step S1 are as follows: Step S1.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained; Step S1.2: Soil from 20 points on the surface of the target saline soil farmland at a depth of 20 cm is respectively dug and mixed into a sample to be tested; Step S1.3: Determine the total salt content S of the soil of the sample to be tested by the drying weight method; Step S1.4: assigning a score to the soil total salt index a according to the value of the soil total salt content S; The soil total salt index a is determined according to the numerical value of the soil total salt content S. When the soil total salt content is 0<S≤3g / kg, the soil total salt index a=100; when the soil total salt content is 3<S≤6g / kg, the soil total salt index a=50; when the soil total salt content is 6<S≤10g / kg, the soil total salt index a=25; when the soil total salt content is 10<S≤20g / kg, the soil total salt index a=0.

3. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The specific steps of step S2 are as follows: Step S2.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained; Step S2.2: Soil from 20 points on the surface of the target saline soil farmland at a depth of 20 cm is respectively dug and mixed into a sample to be tested; Step S2.3: Determine the organic matter content OM of the sample to be tested by dry burning method; Step S2.4: assigning points to the soil organic matter content index b according to the value of the soil organic matter content OM; The soil organic matter content index b is determined according to the numerical value of the soil organic matter content OM. When the soil organic matter content is 0<OM≤1%, the soil organic matter content index b=10; when the soil organic matter content is 1%<OM≤2%, the soil organic matter content index b=20; when the soil organic matter content is 2%<OM≤3%, the soil organic matter content index b=30; when the soil organic matter content is 3%<OM≤4%, the soil organic matter content index b=40; when the soil organic matter content is 4%<OM≤5%, the soil organic matter content index b=50. The soil organic matter content index b=50; when the soil organic matter content is 5%<OM≤6%, the soil organic matter content index b=60; when the soil organic matter content is 6%<OM≤7%, the soil organic matter content index b=70; when the soil organic matter content is 7%<OM≤8%, the soil organic matter content index b=80; when the soil organic matter content is 8%<OM≤9%, the soil organic matter content index b=90; when the soil organic matter content is 9%<OM≤10%, the soil organic matter content index b=100.

4. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The specific steps of step S3 are as follows: Step S3.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained; Step S3.2: Soil from 20 points on the surface of the target saline soil farmland at a depth of 20 cm is respectively dug and mixed into a sample to be tested; Step S3.3: Determine the total nitrogen content N in the soil by semi-micro Kjeldahl method; Step S3.4: assigning a score to the soil total nitrogen content index c according to the value of the soil total nitrogen content N; The soil total nitrogen content index c is determined according to the numerical value of the soil total nitrogen content N. When the soil total nitrogen content is 0<N≤0.1%, the soil total nitrogen content index=0; when the soil total nitrogen content is 0.1%<N≤0.125%, the soil total nitrogen content index=25; when the soil total nitrogen content is 0.125%<N≤0.15%, the soil total nitrogen content index c=50; when the soil total nitrogen content is 0.15%<N≤0.175%, the soil total nitrogen content index=75; when the soil total nitrogen content is 0.175%<N≤0.2%, the soil total nitrogen content index=100; when the soil total nitrogen content N>0.2%, the soil total nitrogen content index=0.

5. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The specific steps of step S4 are as follows: Step S4.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained; Step S4.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested; Step S4.3: Determine the soil available phosphorus content P by sodium bicarbonate extraction method; Step S4.4: assigning a score to the soil available phosphorus content index d according to the value of the soil available phosphorus content P; The soil available phosphorus content index d is determined according to the numerical value of the soil available phosphorus content P. When the soil available phosphorus content is 0<P≤0.01%, the soil available phosphorus content index d=0; when the soil available phosphorus content is 0.01%<P≤0.02%, the soil available phosphorus content index d=25; when the soil available phosphorus content is 0.02%<P≤0.03%, the soil available phosphorus content index d=50; when the soil available phosphorus content is 0.03%<P≤0.04%, the soil available phosphorus content index d=75; when the soil available phosphorus content is 0.04%<P≤0.05%, the soil available phosphorus content index d=100; when the soil available phosphorus content P>0.05%, the soil available phosphorus content index d=0.

6. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The specific steps of step S5 are as follows: Step S5.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained; Step S5.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested; Step S5.3: Determine the available potassium content K in the soil by ammonium acetate extraction-flame photometry; Step S5.4: assigning a score to the soil available potassium content index e according to the value of the soil available potassium content K; The soil available potassium content index e is determined according to the numerical value of the soil available potassium content K. When the soil available potassium content is 0<P≤1%, the soil available potassium content index e=0; when the soil available potassium content is 1%<P≤1.25%, the soil available potassium content index e=25; when the soil available potassium content is 1.25%<P≤1.5%, the soil available potassium content index e=50; when the soil available potassium content is 1.5%<P≤1.75%, the soil available potassium content index e=75; when the soil available potassium content is 1.75%<P≤2%, the soil available potassium content index e=100; when the soil available potassium content K>2%, the soil available potassium content index e=0.

7. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The specific steps of step S6 are as follows: Step S6.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained; Step S6.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested; Step S6.3: Determine the natural soil moisture w by the ring knife method; Step S6.4: assigning a score to the soil natural moisture index f according to the value of the soil natural moisture w; The natural soil moisture index f is determined according to the numerical value of the natural soil moisture content w. When the natural soil moisture content is 0<w≤10%, the natural soil moisture index f=0; when the natural soil moisture content is 10%<w≤20%, the natural soil moisture index f=25; when the natural soil moisture content is 20%<w≤30%, the natural soil moisture index f=50; when the natural soil moisture content is 30%<w≤40%, the natural soil moisture index f=100; when the natural soil moisture content w>40%, the natural soil moisture index f=0.

8. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The specific steps of step S7 are as follows: Step S7.1: by measuring the total area of ​​the target saline soil farmland, 20 points with average distribution on the surface of the target saline soil farmland are obtained; Step S7.2: Soil at a depth of 20 cm from 20 points on the surface of the target saline soil farmland is respectively dug and mixed into a sample to be tested; Step S7.3: Determine the soil bulk density ρ by the ring knife method; Step S7.4: assigning points to the soil bulk density index g according to the value of the soil bulk density ρ; The soil bulk density index g is determined according to the value of the soil bulk density ρ. When the soil bulk density is 1g / cm 3 <ρ≤1.1g / cm 3 When the soil bulk density index is g = 100; when the soil bulk density is 1.1 g / cm 3 <ρ≤1.2g / cm 3 When the soil bulk density index g = 75; when the soil bulk density is 1.2g / cm 3 <ρ≤1.3g / cm 3 When the soil bulk density index g = 50; when the soil bulk density is 1.3g / cm 3 <ρ≤1.4g / cm 3 When the soil bulk density index g = 25; when the soil bulk density ρ> 1.4g / cm 3 When the soil bulk density index g=0.

9. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 1, characterized in that: The saline soil farmland cultivation suitability contribution index model described in step S8 is as follows: SSCCI=0.3×a+0.2×b+0.1×c+0.1×d+0.1×e+0.1×f+0.1×g Among them, SSCCI is the contribution index of saline soil farmland to cultivation suitability. The larger the SSCCI value, the higher the suitability of saline soil farmland for cultivation.

10. The method for evaluating the suitability of cultivated land for cultivation based on the comprehensive land productivity of saline soil according to claim 9, characterized in that: The evaluation method for the suitability of target saline soil farmland for cultivation is as follows: When SSCCI∈(0,20], the suitability of saline soil for cultivation is poor; When SSCCI∈(20,40], the suitability of saline soil for cultivation is poor; When SSCCI∈(40,60], the suitability of saline soil for cultivation is ordinary; When SSCCI∈(60,80], the saline soil is well suitable for cultivation; When SSCCI∈(80,100], the suitability of saline soil for cultivation is excellent.

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