Method for improving black land through combined application of organic fertilizer and inorganic fertilizer and application

Abstract

The invention provides a method for improving black land through combined application of organic fertilizer and inorganic fertilizer and application, and relates to the technical field of fertilizer. The method comprises the following steps: applying cow dung or sheep manure combined with a blended fertilizer as a base fertilizer, and dressing urea to improve the black land; the ratio of N to P to K in the blended fertilizer is 19: 19: 19, and the total nutrient content is greater than or equal to 57%; n in the urea is greater than or equal to 46%. Different organic fertilizers (cow dung and sheep manure) and inorganic fertilizers are applied in a matched mode, the ratio of active carbon to inert carbon in soil is effectively adjusted, the content of organic carbon in the soil is increased, the soil environment is improved, and therefore the crop quality is improved, the crop yield is effectively increased, and the method is a green and efficient method for improving the soil characteristics of the black land. And the method has certain economic benefits and popularization and application values.

Description

Technical Field

[0001] This invention belongs to the field of fertilizer technology, specifically relating to a method and application of using a combination of organic and inorganic fertilizers to improve black soil. Background Technology

[0002] Northeast China's black soil region is a crucial grain production base, with a large corn planting area and significant importance to national food security. While the long-term reliance on chemical fertilizers for yield increases has improved yields per unit area, it has also led to problems such as declining soil organic carbon (SOC), soil acidification, and degradation, hindering the sustainable utilization of black soil. Although existing studies have shown that organic fertilizers generally contribute to increasing SOC content, the quantitative relationship between the different responses of various organic fertilizers (cattle and sheep manure) to carbon components and their proportions and yield increases remains unclear. Furthermore, the existing fertilization system lacks quantitative control indicators and thresholds, making it difficult to predict the dynamic balance between active and inert carbon, thus restricting the targeted application and regional promotion of synergistic organic-inorganic fertilizer application.

[0003] Therefore, there is an urgent need to establish an organic-inorganic fertilizer application method that takes carbon composition structure as the core indicator and is directly coupled with yield target, so as to achieve both carbon pool stabilization and high crop yield in black soil areas, and provide scalable technical support for the protection of black soil and agricultural carbon sink. Summary of the Invention

[0004] The purpose of this invention is to provide a method and application for improving black soil by combining organic and inorganic fertilizers, effectively adjusting the ratio of active carbon to inert carbon in the soil, increasing the soil organic carbon content, improving the soil environment, and thus effectively increasing crop yield.

[0005] This invention provides a method for improving black soil by applying a combination of organic and inorganic fertilizers, comprising the following steps: Apply cow or sheep manure mixed with fertilizer as base fertilizer, and top-dress with urea to improve black soil. The blended fertilizer contains N:P:K = 19:19:19, with a total nutrient content ≥ 57%; the urea contains N ≥ 46%.

[0006] Preferably, the cow manure contains SOC=20%~25%, TN=0.4%~0.6%, AP=0.15%~0.17%, and AK=0.2%~0.4%; the sheep manure contains SOC=20%~25%, TN=0.5%~0.7%, AP=0.16%~0.18%, and AK=0.2%~0.4%.

[0007] Preferably, the application rate of cow or sheep manure is 25,000~35,000 kg / hm². 2 The application rate of the blended fertilizer is 250~350 kg / hm. 2The application rate of urea is 150~225 kg / hm. 2 .

[0008] Preferably, the cow or sheep manure is applied in mid-October after the previous crop is harvested, the blended fertilizer is applied at the same time as sowing in early May, and the urea is applied as a top dressing during the jointing stage.

[0009] Preferably, the black soil is located along the foothills of the Greater Khingan Mountains; crops grown on the black soil include corn.

[0010] The present invention also provides the application of the method in balancing crop yield improvement and adjusting the proportion of active carbon and inert carbon in total organic carbon in the soil.

[0011] Preferably, the crop is corn.

[0012] Preferably, when cow manure is applied in combination with blended fertilizer as base fertilizer and urea is applied as top dressing to improve black soil, the ratio of LFOC / SOC and MOC / SOC can be increased; when sheep manure is applied in combination with blended fertilizer as base fertilizer and urea is applied as top dressing to improve black soil, the ratio of HFOC / SOC and POC / SOC can be increased.

[0013] The present invention also provides the application of the method in increasing soil organic carbon content.

[0014] The present invention also provides the application of the method in improving the quality of corn.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a method for improving black soil by combining organic and inorganic fertilizers. By combining different organic fertilizers (cow manure, sheep manure) with inorganic fertilizers (blended fertilizer, urea), the ratio of active carbon to inert carbon in the soil is effectively adjusted, the soil organic carbon content is increased, and the soil environment is improved, thereby improving crop quality and effectively increasing crop yield. This is a green and efficient method for improving the characteristics of black soil, with certain economic benefits and application value. Attached Figure Description

[0016] Figure 1 The results of the effects of different organic and inorganic fertilizer combinations on maize yield in Example 1 are shown below. Different lowercase letters indicate significant differences between different treatments. P <0.05), the error bars represent the standard deviation.

[0017] Figure 2 The table shows the soil organic carbon (SOC) content under different organic and inorganic fertilizer application treatments in Example 1. A represents the results of the cow manure treatment group, and B represents the results of the sheep manure treatment group. Different lowercase letters indicate statistically significant differences between different application rates.P <0.05).

[0018] Figure 3 The table shows the POC / SOC and MOC / SOC ratios, as well as the LFOC / SOC and HFOC / SOC ratios, of soils under different organic and inorganic fertilizer application treatments in Example 1. The line graphs represent POC / MOC and LFOC / HFOC. Specifically, A represents the POC / SOC and MOC / SOC results for the cow manure treatment group, B represents the POC / SOC and MOC / SOC results for the sheep manure treatment group, C represents the LFOC / SOC and HFOC / SOC results for the cow manure treatment group, and D represents the LFOC / SOC and HFOC / SOC results for the sheep manure treatment group. Different lowercase letters indicate statistically significant differences between different application rates. P <0.05).

[0019] Figure 4 This section describes the relationship between the POC / MOC and LFOC / HFOC values ​​and crop yield under different organic and inorganic fertilizer application treatments in Example 1. Specifically, A represents the relationship between the POC / MOC value and crop yield in the cow manure treatment group, B represents the relationship between the POC / MOC value and crop yield in the sheep manure treatment group, C represents the relationship between the LFOC / HFOC value and crop yield in the cow manure treatment group, and D represents the relationship between the LFOC / HFOC value and crop yield in the sheep manure treatment group. Detailed Implementation

[0020] This invention provides a method for improving black soil by combining organic and inorganic fertilizers, comprising the following steps: applying cow manure or sheep manure as a base fertilizer and applying urea as a top dressing to improve the black soil; wherein the N:P:K ratio of the compound fertilizer is 19:19:19, and the total nutrients are ≥57%; and the N content of the urea is ≥46%.

[0021] In this invention, the cow dung preferably contains SOC=20%~25%, TN=0.4%~0.6%, AP=0.15%~0.17%, and AK=0.2%~0.4%; more preferably, SOC=21%~24%, TN=0.45%~0.55%, AP=0.155%~0.165%, and AK=0.25%~0.35%; and even more preferably, SOC=22.2%, TN=0.50%, AP=0.16%, and AK=0.32%. Preferably, the sheep manure contains SOC = 20%~25%, TN = 0.5%~0.7%, AP = 0.16%~0.18%, and AK = 0.2%~0.4%; more preferably, SOC = 21%~24%, TN = 0.55%~0.65%, AP = 0.165%~0.175%, and AK = 0.25%~0.36%; even more preferably, SOC = 22.3%, TN = 0.59%, AP = 0.17%, and AK = 0.34%.

[0022] In this invention, the preferred application rate of cow or sheep manure is 25,000 to 35,000 kg / hm². 2 Further preferred is 28,000~32,000 kg / hm 2 More preferably 30,000 kg / hm 2 The preferred application rate of the blended fertilizer is 250-350 kg / hm². 2 Further preferred is 280~320 kg / hm 2 More preferably 300 kg / hm 2 The preferred application rate of urea is 150-225 kg / hm². 2 .

[0023] In this invention, the cow or sheep manure is applied in mid-October after the previous crop is harvested; the blended fertilizer is applied simultaneously with sowing in early May; and the urea is applied as a top dressing during the jointing stage. The black soil is preferably located along the foothills of the Greater Khingan Mountains. In this method, the crop planted on the black soil is corn. As an optional implementation, the corn variety is 'Fengyu 8'.

[0024] This invention also provides the application of the method in balancing crop yield improvement and adjusting the proportion of active and inert carbon in total organic carbon in the soil, wherein the crop is preferably maize. As an optional implementation, the maize variety is 'Fengyu 8'. In this application, when cow manure is applied in combination with blended fertilizer as base fertilizer and urea is applied as top dressing to improve black soil, the ratios of LFOC / SOC and MOC / SOC can be increased; when sheep manure is applied in combination with blended fertilizer as base fertilizer and urea is applied as top dressing to improve black soil, the ratios of HFOC / SOC and POC / SOC can be increased.

[0025] The present invention also provides the application of the method in increasing soil organic carbon content.

[0026] The present invention also provides the application of the method in improving the quality of corn.

[0027] This invention optimizes soil carbon structure by combining different organic fertilizers (cow manure, sheep manure) with inorganic fertilizers (blended fertilizers, urea), achieving a coordinated balance between active and stable organic carbon pools, maintaining them within a reasonable range suitable for soil type and utilization method. The method effectively regulates the ratio of active to inert carbon in the soil, specifically at 30,000 kg / hm². 2 Apply cow manure at a rate of 300 kg / hm² 2 Add 225 kg / hm of urea as a supplementary fertilizer 2 The highest values ​​for LFOC / SOC and MOC / SOC were observed at 30,000 kg / hm². 2 Apply 300 kg / hm² of sheep manure 2 Add 150 kg / hm of urea as a supplementary fertilizer in the blend. 2 The LFOC / HFOC and POC / SOC ratios were highest at this time. Under cow manure treatment, LFOC / HFOC showed a trend consistent with yield, while under sheep manure treatment, POC / MOC tended to correlate with yield changes. Crop yield can be effectively increased by adjusting LFOC / HFOC under cow manure treatment or POC / MOC under sheep manure treatment.

[0028] The method described in this invention also significantly increases soil organic carbon content, wherein 30,000 kg / hm 2 Apply 300 kg / hm² of sheep manure 2 Add 150 kg / hm of urea as a supplementary fertilizer in the blend. 2 or 30,000 kg / hm 2 Apply cow manure at a rate of 300 kg / hm² 2 Add 150 kg / hm of urea as a supplementary fertilizer in the blend. 2 The highest organic carbon content was 15.85 g / kg (cattle manure combined application treatment group) and 16.88 g / kg (sheep manure combined application treatment group), respectively.

[0029] In the following embodiments of the present invention, SOC represents total soil organic carbon; particulate organic carbon (POC) and light organic carbon (LFOC) belong to the category of active organic carbon; mineral-bound organic carbon (MOC) and recombinant organic carbon (HFOC) belong to the category of inert organic carbon. The meanings of POC / SOC, MOC / SOC, LFOC / SOC, HFOC / SOC, POC / MOC, and LFOC / HFOC are as follows: POC / SOC refers to the proportion of particulate organic carbon to total soil organic carbon. MOC / SOC refers to the proportion of mineral-bound organic carbon to total soil organic carbon. LFOC / SOC refers to the proportion of light organic carbon to total soil organic carbon. HFOC / SOC refers to the proportion of recombinant organic carbon to total soil organic carbon. POC / MOC refers to the ratio of particulate organic carbon to mineral-bound organic carbon. LFOC / HFOC refers to the ratio of light organic carbon to recombinant organic carbon.

[0030] Unless otherwise specified, the experimental methods described in the following examples are conventional methods; unless otherwise specified, the reagents and materials are commercially available.

[0031] Example 1 A method for improving black soil by combining organic and inorganic fertilizers includes the following steps: 1. Experimental site and soil conditions The experimental site is located along the foothills of the Greater Khingan Mountains (128°28′32″E, 48°09′16″N), at an altitude of 256 meters. The region has a temperate continental monsoon climate with distinct seasonal variations. The average annual temperature is 4.2℃, with a minimum of -16℃ in January and a maximum of 23℃ in July. The annual precipitation is 458 mm, with 75% of the precipitation concentrated in July and August. The frost-free period is approximately 90 to 130 days.

[0032] The soil type is typical black soil, and the main crops grown are corn, soybeans, potatoes, or sugar beets. Crops are harvested once a year, and the main farming method is dryland farming.

[0033] The soil nutrients ranged from pH 6.19 to 6.63, with SOC content ranging from 11.97 to 16.85 g / kg, TN content from 0.48 to 0.67 g / kg, TP content from 0.75 to 0.84 g / kg, TK content from 16.92 to 18.32 g / kg, AP content from 11.31 to 19.47 mg / kg, and AK content from 120.84 to 127.52 mg / kg. The previous crop was maize, and the maize variety planted in the experiment was 'Fengyu 8'.

[0034] 2. Experimental treatments: Corn was sown on May 2, 2024, and there were 10 treatments in total.

[0035] Treatment 1 (CK): No fertilizer was applied, and no additional urea was applied during the jointing stage; Treatment 2 (CM): Apply 30,000 kg / hm 2 Cow manure (SOC=22.2%, TN=0.50%, AP=0.16%, AK=0.32%) was used as base fertilizer, and no additional urea was applied during the jointing stage; Treatment 3 (CM+CF1): Apply 30000 kg / hm 2 cow dung and 300 kg / hm 2 A blended fertilizer (N:P:K = 19:19:19, total nutrients ≥ 57%) was used as base fertilizer, and 75 kg / hm² was added as top dressing during the jointing stage. 2 Urea (N≥46%) Treatment 4 (CM+CF2): Apply 30000 kg / hm 2 cow dung and 300 kg / hm 2 A blended fertilizer (N:P:K = 19:19:19, total nutrients ≥ 57%) was used as base fertilizer, and 150 kg / hm² was applied as top dressing during the jointing stage. 2 Urea; Treatment 5 (CM+CF3): Apply 30000 kg / hm 2 cow dung and 300 kg / hm 2 A blended fertilizer (N:P:K = 19:19:19, total nutrients ≥ 57%) was used as base fertilizer, and 225 kg / hm² was applied as top dressing during the jointing stage. 2 Urea; Treatment 6 (CF): Apply 300 kg / hm 2 The blended fertilizer (N:P:K = 19:19:19, total nutrients ≥ 57%) and 100.5 kg / hm 2 Diammonium phosphate (N:P=18:46, total nutrients ≥64%) and 120 kg / hm 2 Potassium sulfate (K2O≥50%, Cl) - ≤1.5%, S≥16%) Treatment 7 (SM): Apply 30,000 kg / hm 2 Sheep manure (SOC=22.3%, TN=0.59%, AP=0.17%, AK=0.34%) was used as base fertilizer, and no additional urea was added during the jointing stage; Treatment 8 (SM+CF1): Apply 30,000 kg / hm 2 sheep manure and 300 kg / hm 2 A blended fertilizer (N:P:K = 19:19:19, total nutrients ≥ 57%) was used as base fertilizer, and 75 kg / hm² was applied as top dressing during the jointing stage. 2 Urea; Treatment 9 (SM+CF2): Apply 30000 kg / hm 2sheep manure and 300 kg / hm 2 A blended fertilizer (N:P:K = 19:19:19, total nutrients ≥ 57%) was used as base fertilizer, and 150 kg / hm² was applied as top dressing during the jointing stage. 2 Urea; Treatment 10 (SM+CF3): Apply 30,000 kg / hm 2 sheep manure and 300 kg / hm 2 A blended fertilizer (N:P:K = 19:19:19, total nutrients ≥ 57%) was used as base fertilizer, and 225 kg / hm² was applied as top dressing during the jointing stage. 2 Urea.

[0036] 3. Corn Fertilization Program To ensure the organic fertilizer was evenly incorporated into the soil, cow and sheep manure were evenly spread on the field surface in mid-October 2022, according to the application rate specified in the experimental protocol. Deep plowing followed, mixing the manure into the soil, completing the autumn application and pretreatment. Sowing was carried out in early May 2023 using a seeder. Simultaneously, a blended fertilizer was applied to the soil as base fertilizer. Sprinkler irrigation was immediately applied after sowing to replenish moisture and promote seedling emergence. No irrigation was carried out during the subsequent growth stages. Pre-emergence and post-emergence herbicides were ethazine octyl ester (140–160 mL / mu) and nicotine atrazine (80–160 mL / mu), respectively. Urea was applied mechanically during the corn jointing stage (late June 2023). The treatment measures were the same for 2023 and 2024, and field management and pest and disease control during the corn growth period were consistent with local farmers' practices.

[0037] 4. Test and measurement indicators Soil samples were collected at crop maturity to determine soil organic carbon and its components (POC, MOC, LFOC, HFOC). The content of each carbon component was determined using chemical methods, and indices such as POC / SOC, MOC / SOC, LFOC / SOC, HFOC / SOC, POC / MOC, and LFOC / HFOC were calculated. Crop yield was also measured.

[0038] The method for improving black soil characteristics using different organic-inorganic fertilizer combinations as described in the embodiments is shown in the comparison results. Figures 1-4 .

[0039] from Figure 1 It can be seen that, compared with the control (CK), single application of organic fertilizers (CM and SM), and inorganic fertilizers (CF), combined application significantly increased maize yield, with the CM+CF3 and SM+CF2 treatments showing the highest yields. In the CM+CF gradient treatments, yield increased with increasing urea supplementation. The CM+CF3 treatment achieved the highest yield, at 9660.6 kg / hm². 2The yield of CM+CF2 was 58.27% and 20.54% higher than that of CM and CF, respectively. Furthermore, the yield of CM+CF2 was significantly higher than that of CM and CF. However, there was no significant difference between CM+CF1 and CF. P >0.05). In the SM+CF gradient treatment, the yield first increased and then decreased with the increase of urea supplementation, with SM+CF2 reaching a maximum of 10139.8 kg / hm. 2 The yield was 73.26% higher than SM and 35.65% higher than CF, followed by SM+CF3 and SM+CF2, all of which had significantly higher yields than SM and CF. P <0.05). Furthermore, compared to the treatment with cow manure and sheep manure, the yield of SM+CF2 was higher than that of CM+CF3. This indicates that the combined application of organic and inorganic fertilizers can effectively increase maize yield, and the application of sheep manure with chemical fertilizer and an additional urea of ​​150 kg / hm² is particularly effective. 2 Apply cow manure along with chemical fertilizer and supplement with urea at a rate of 225 kg / hm² 2 It has the highest hourly output.

[0040] from Figure 2 It can be seen that there are significant differences in SOC content among different treatments. P <0.05). In the CM treatment group, the SOC content of CK was the lowest at 10.54 g / kg. There was no significant difference between CM and CF. Compared with fertilizer application alone, the SOC content of the combined application treatments was significantly increased. The SOC content of the CM+CF2 treatment was the highest at 15.85 g / kg, followed by the CM+CF1 and CM+CF3 treatments. The SOC content of the combined application treatments was 23.41% and 24.40% higher than that of CM and CF, respectively. In the SM treatment group, the SOC content of the combined application treatments was significantly higher than that of SM and CF ( P <0.05). The SM+CF2 treatment had the highest value, 16.88 g / kg, which was 32.55% and 36.59% higher than the CF and SM treatments, respectively. This was followed by the SM+CF3 and SM+CF treatments. CM+CF1 and CM+CF2 showed similar trends in yield changes, while the soil organic carbon content in the SM treatment group showed a consistent relationship with yield changes, with the organic carbon content in the SM treatment group being higher than that in the CM treatment group. This indicates that the combined application of organic and inorganic fertilizers can significantly increase the soil organic carbon content, with sheep manure combined with chemical fertilizer (blended fertilizer) and urea supplemented at 150 kg / hm² being particularly effective. 2 Apply cow manure mixed with chemical fertilizer (blended fertilizer) and add 150 kg / hm of urea. 2 The organic carbon content is highest at this time.

[0041] from Figure 3It can be seen that in the CM treatment group, both POC / SOC and MOC / SOC showed little change. POC / SOC decreased with increasing fertilization level. Compared with the CF and CM treatments, the CM+CF1 treatment had a higher POC / SOC, and there were significant differences among the treatments. P <0.05). Furthermore, MOC / SOC increased with increasing fertilization gradient, reaching a peak at a urea top dressing rate of 225 kg / hm². 2 The POC / MOC ratio reached its maximum value at a certain time. With increasing fertilization gradient, the trend of POC / MOC was consistent with that of POC / SOC, with CM+CF1 showing the highest POC / MOC at 0.12 among all treatments. In the SM treatment group, POC / SOC increased with increasing urea gradient. Compared to the CK and CF treatment groups, the POC / SOC of the SM+CF treatment group was significantly improved. Among all treatments, the SM+CF3 treatment had the highest POC / SOC value, significantly increasing by 33.80% compared to the CF treatment. P <0.05). Next were SM+CF2 and SM+CF1, which increased by 33.26% and 20.08% respectively compared to the CF treatment. Conversely, MOC / SOC decreased with increasing urea supplementation. The MOC / SOC of the SM+CF treatment was significantly lower than that of the CK and CF treatments ( P <0.05). In the CM treatment group, LFOC / SOC increased with increasing fertilization gradient. The highest LFOC / SOC was found in CM+CF3, reaching 19.5%. Conversely, MOC / SOC decreased with increasing fertilization gradient, with the highest value in CM+CF1 at 85.24%. The trend of LFOC / HFOC was consistent with that of LFOC / SOC. In the SM treatment group, the LFOC / SOC value showed a trend of first decreasing and then increasing with increasing fertilization gradient. The proportion of activated carbon was higher than in the CF and SM groups (…). P <0.05), the SM+CF1 treatment had the highest HFOC / SOC ratio, reaching 23.75%. The HFOC / SOC ratio initially increased and then decreased with increasing fertilization gradient. The SM+CF2 treatment had the highest HFOC / SOC ratio of 78.24%. Except for the CK, no significant differences were observed among the treatments. P >0.05). The trends of LFOC / HFOC and LFOC / SOC were consistent across all treatment groups. The SM+CF treatment group also showed a trend of first decreasing and then increasing. This indicates that the combined application of organic and inorganic fertilizers can significantly regulate the proportion of active and inert carbon in the total organic carbon of the soil. The CM+CF3 treatment had the highest LFOC / SOC and MOC / SOC, while the SM+CF2 treatment had the highest HFOC / SOC and POC / SOC. The LFOC / HFOC ratio under cow manure treatment was consistent with the yield trend, while the POC / MOC ratio under sheep manure treatment tended to be consistent with yield changes.

[0042] from Figure 4 It can be seen that there is a certain linear relationship between soil organic carbon (SOC) and yield, but the relationship between yield and SOC composition varies under different combinations of organic and inorganic fertilizers. Under the CM treatment, there is no linear relationship between crop yield and POC / MOC (R0). 2 =0.06, P >0.05), but there is a significant positive correlation between it and LFOC / HFOC (R0.05). 2 =0.40, P <0.05). In contrast, under SM treatment, POC / MOC (R 2 =0.50, P <0.05) and LFOC / HFOC (R 2 =0.35, P <0.05) showed a significant positive correlation with crop yield. Compared with LFOC / HFOC, the goodness of fit between POC / MOC and yield was improved by 15% under the SM treatment. This indicates that the combined application of organic and inorganic fertilizers can significantly affect the relationship between crop yield and the ratio of active carbon to inert carbon in the soil. Among them, the yield of the cow manure treatment showed a good correlation with LFOC / HFOC, while the yield of the sheep manure treatment showed a correlation with both POC / MOC and LFOC / HFOC, with a stronger correlation with POC / MOC.

[0043] In summary, this invention effectively regulates the ratio of active carbon to inert carbon in the soil by combining different organic fertilizers (cow manure and sheep manure) with inorganic fertilizers, thereby increasing the soil organic carbon content, improving the soil environment, and ultimately improving crop quality and yield. Therefore, this invention is a green and efficient method for improving the characteristics of black soil, possessing certain economic benefits and application value.

[0044] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for improving black soil by combining organic and inorganic fertilizers, characterized in that, Includes the following steps: Apply cow or sheep manure mixed with fertilizer as base fertilizer, and top-dress with urea to improve black soil. The blended fertilizer contains N:P:K = 19:19:19, with a total nutrient content ≥ 57%; the urea contains N ≥ 46%.

2. The method according to claim 1, characterized in that, The cow manure contains SOC=20%~25%, TN=0.4%~0.6%, AP=0.15%~0.17%, and AK=0.2%~0.4%; the sheep manure contains SOC=20%~25%, TN=0.5%~0.7%, AP=0.16%~0.18%, and AK=0.2%~0.4%.

3. The method according to claim 1, characterized in that, The application rate of cow or sheep manure is 25,000~35,000 kg / hm². 2 The application rate of the blended fertilizer is 250~350 kg / hm. 2 The application rate of urea is 150~225 kg / hm. 2 .

4. The method according to claim 1, characterized in that, The cow or sheep manure is applied in mid-October after the previous crop is harvested, the blended fertilizer is applied at the same time as sowing in early May, and the urea is applied as a top dressing during the jointing stage.

5. The method according to claim 1, characterized in that, The black soil is located along the foothills of the Greater Khingan Mountains; crops grown on the black soil include corn.

6. The application of the method according to any one of claims 1 to 5 in balancing crop yield improvement and adjusting the proportion of active carbon and inert carbon in total organic carbon in the soil.

7. The application according to claim 6, characterized in that, The crop in question is corn.

8. The application according to claim 6, characterized in that, When cow manure is applied in combination with other fertilizers as base fertilizer and urea is applied as top dressing to improve black soil, the ratios of LFOC / SOC and MOC / SOC can be increased. When sheep manure is applied in combination with other fertilizers as base fertilizer and urea is applied as top dressing to improve black soil, the ratios of HFOC / SOC and POC / SOC can be increased.

9. The application of the method according to any one of claims 1 to 5 in increasing soil organic carbon content.

10. The application of the method according to any one of claims 1 to 5 in improving the quality of maize.

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