Saline-alkali land is an important reserve cultivated land, which is of great significance to ensure national food security. Since the 50s of the 20th century, China has begun to improve the use of saline-alkali land research and exploration, after years of efforts, has achieved phased results, for each region, each type of saline-alkali land management model is constantly making new breakthroughs. Standing at the mouth of the Yellow River in Dongying City, Shandong, I saw the boiling Yellow River water rushing into the sea from here. Dongying City is a "land of retreat from the sea". The groundwater is brackish seawater, creating a large area of coastal saline-alkali land. These saline-alkali lands with white salinity were once synonymous with desolate and barren and barren land, "white in spring, rainy in summer, no harvest in ten years and nine months, and half a year's grain of bran vegetables", which was a true portrayal of local farmers. On October 21, 2021, during the inspection and investigation of the Yellow River Delta Agricultural High-tech Industry Demonstration Zone in Dongying City, the general secretary emphasized that the comprehensive utilization of saline-alkali land is of great strategic significance to ensure national food security and secure China's rice bowl. Since then, the general secretary has made important instructions on the comprehensive transformation and utilization of saline-alkali land. In May this year, the general secretary pointed out during his inspection in Cangzhou City, Hebei Province, that the comprehensive utilization of saline-alkali land is a strategic issue and must be placed in an important position. At the second meeting of the Financial and Economic Committee held on July 20 this year, the general secretary pointed out that it is necessary to do a good job in agriculture with saline-alkali land characteristics. On December 1, the 23rd issue of Qiushi magazine published an important article by the general secretary of the Communist Party of China, "Effectively Strengthen the Protection of Cultivated Land and Do a Good Job in the Comprehensive Transformation and Utilization of Saline-alkali Land". In October, the reporter walked into a large team of Qingtuo Management Area of Dongying Modern Agricultural Demonstration Zone, and in the experimental field, the new saline-alkali tolerant soybean line "Kedou 35" of the research team of Tian Zhixi of the Institute of Genetics and Developmental Biology of the Chinese Academy of Sciences has borne fruitful fruits, and the full pods show the joy of harvest. In Dongying, scholars from the Chinese Academy of Sciences, Chinese Academy of Agricultural Sciences, China Agricultural University and other universities and scientific research institutions have gathered, and a number of scientific research achievements have emerged. After several generations of efforts, Dongying City has initially explored a characteristic path of comprehensive utilization of saline-alkali land with "salt adaptation, ecological priority, combination of use and nutrition, and quality and efficiency", and the former saline-alkali beach is gorgeously "transformed". In China, saline-alkali land is one of the main types of low- and medium-yielding soils. According to the data of the second national soil census, there are about 14 saline-alkali land resources in China900 million acres, of which about 5500 million acres of saline-alkali land has a certain utilization value. In 2011, the former Ministry of Agriculture organized a survey of 18 provinces (autonomous regions and municipalities directly under the central government), including Beijing, Tianjin, Hebei, Shanxi, Mongolia, Liaoning, Jiji, Hei, Shanghai, Jiangsu, Zhejiang, Anhui, Shandong, Shaanxi, Gansu, Qinghai, Ningbo and Xin, and found that the total area of available saline-alkali land was about 29.9 billion mu, including 11.4 billion mu, saline-alkali barren (grassland) land 18.5 billion acres. Saline-alkali land is an important reserve arable land. Under the current situation of cultivated land protection and food security, it is self-evident that the potential of comprehensive utilization of saline-alkali land should be fully tapped, the transformation and upgrading of existing saline-alkali cultivated land should be strengthened, and the trend of salinization of cultivated land should be effectively curbed, which can greatly expand the space for agricultural production and ensure national food security. This work also has important ecological implications. At present, the salinization trend of cultivated land in some areas of China is aggravated, and the vegetation on saline-alkali land in the "Three Norths" and other areas is sparse, and the ability to prevent wind and fix sand is poor. The comprehensive treatment of saline-alkali land can effectively improve the ecological environment of water and soil, and build a life community of "mountains, rivers, forests, fields, lakes, grass and sand".
The relentless exploration of transforming nature
Saline-alkali land is mainly divided into two types: salinized soil and saline-alkali soil. In the natural environment, saline-alkali land is mostly located in the area of arid climate, high groundwater level, high salinity of groundwater, low-lying and lack of drainage outlets, and the reason for its formation is closely related to water - due to the small amount of precipitation and large evaporation, the salt and alkali dissolved in the water accumulate on the surface of the soil with the evaporation of water, thus forming saline-alkali land. In addition, human factors such as drought, irrational tillage, backward drainage equipment, and facility cultivation will also lead to secondary salinization of soil. According to geographical location, soil factors, climatic conditions and saline-alkali genesis, the saline-alkali land in China can be roughly divided into coastal saline-alkali area, Huang-Huai-Hai Plain saline-alkali area, Northeast Songnen Plain saline-alkali area and northwest inland saline-alkali area. China has a long history of controlling saline-alkali land, which is also a process of human transformation of nature and fighting against heaven and earth. According to legend, in 2200 B.C., Dayu had the practice of establishing ditch drainage and irrigation networks to improve saline-alkali land, and classified and specially described brine (saline-alkali soil) in the agricultural book "Yu Gong". In the 6th century A.D., in the book "Qi Min Yaoshu", there is also a record of "green manure rotation to alkali". The large-scale improvement and utilization of saline-alkali land began after the founding of the People's Republic of China, and the comprehensive management of saline-alkali land and the development of reserve cultivated land were organized. From the late 50s to the end of the 60s of the 20th century, the state carried out large-scale water conservancy construction, gradually established and improved the backbone projects and supporting canal system projects in the main irrigation areas, and carried out the construction of barrages and dams, the construction of plain reservoirs, and the diversion of yellow water for irrigation, which opened the prelude to the management of saline-alkali land. Since the 70s of the 20th century, on the one hand, people have perfected the water conservancy engineering system, dredging and renovating the Yellow River, Huai River, Haihe River, etc., on the other hand, strengthening the construction of water conservancy in farmland, improving irrigation and drainage facilities, and controlling saline-alkali land through salt washing and discharge, and achieved positive results. Since the 80s of the 20th century, the overall idea of saline-alkali land management has gradually changed from "treating soil with water" to "paying equal attention to prevention and control, combining agriculture and water, comprehensive treatment, and adapting measures to local conditions". In 2013, the "National High-standard Farmland Construction Master Plan" was approved and implemented, and all localities continued to promote the construction of high-standard farmland, which greatly improved the irrigation and drainage capacity of farmland and provided basic conditions for the prevention of soil salinization. In 2020, the Ministry of Agriculture and Rural Affairs launched a pilot project on the management of degraded cultivated land, and organized the exploration of multiple models on moderately and mildly saline-alkali cultivated land in eight provinces (autonomous regions) including Hebei and Inner Mongolia. At the same time, the policy of saline-alkali land management is also constantly improving. In 2014, 10 departments, including the Ministry of Science and Technology and the former Ministry of Agriculture, jointly issued the "Guiding Opinions on Strengthening the Governance of Saline-alkali Land". In the "Farmland Water Conservancy Regulations", "Soil Pollution Prevention and Control Action Plan", "Guiding Opinions on Accelerating the Development of Agricultural Circular Economy", "National Land Consolidation Plan" and other documents, it is proposed to strengthen the improvement and utilization of saline-alkali land. After long-term continuous treatment, the improvement of saline-alkali land in China has achieved phased results. In the Huang-Huai-Hai Plain, the area of saline-alkali cultivated land has decreased from 50 million mu in the 80s of the last century to only sporadic distribution at present, and has become an important major grain producing area. In the Songnen Plain in Northeast China, people have improved and utilized soda saline-alkali soil by changing drought to water, which not only successfully manages saline-alkali land, but also has both economic and ecological benefits.
From "adapting to the land" to "adapting the land to the species", the two-way rush
On July 9, in the 225th Regiment of the 14th Division of the Xinjiang Production and Construction Corps in Hotan Prefecture, Xinjiang Uygur Autonomous Region, the team of Hu Shuwen, a professor at China Agricultural University, sowed green storage corn seeds on moderately and mildly salinized cultivated land, and started a soil improvement experiment - using a new functional water-soluble soil conditioner independently developed by the team in the integrated drip irrigation of water and fertilizer. "From July 31 to September 18, we applied the soil conditioner five times, about 10 days apart. Zou Li, a master's student at China Agricultural University, told reporters that after a week of drip irrigation soil amendment, the difference in corn growth between the experimental group and the control group was obvious. By September 1, the maize of the experimental group had entered the stage of large-scale tasseling, 10 days earlier than the control group. 
In the experimental field of the 225th Regiment of the 14th Division of the Xinjiang Production and Construction Corps, the researchers of Hu Shuwen's team took a group photo with the experimental group (left is the land using the improver) and the control group (right) corn. Data map It took only 52 days for silage corn yield per mu to increase significantly, and the field yield test results on September 20 showed that the yield per mu of the experimental group reached 329238 kg, the yield per mu of the control group was 205686 kg, an increase of 60%;The ear weight of silage corn in the experimental group was 1172 per mu34 kg, spike length of 2972 cm, the control group was 7371 kg, 252 cm. Tested showed a 62% decrease in soil salinity and a 173% increase in soil moisture in the root zone after the improvement compared to the control plot. This is all thanks to the saline-alkali land treatment technology model of "reshaping soil aggregate structure and efficient desalination" explored by Hu Shuwen's team after more than ten years of research. "The soil in saline land is dry, hard, compact, and impermeable to neither water nor aeration. Not only are plants not easy to survive, most of the microorganisms are also dormant, and many saline soils have very few nutrients, or even less than the critical value. Hu Shuwen introduced that his core technology is to develop environmentally friendly bio-based amendments, so that the originally small particles of soil cemented into micro-aggregates. After the soil particles become larger, the permeability and permeability increase, the water conductivity is greatly improved, and the efficiency of salt washing and desalination is greatly improvedThe increased gap between the soil particles makes it more difficult for the deep salinity to rise to the tillage layer through capillary phenomena, so that the soil has the basic growing conditions for crops. On this basis, the substances secreted by the microorganisms in the planted crops and soil can further inhibit the salinity in the soil, making the aggregates more stable and not easy to "return to salt". Combined with measures such as water diversion and salt washing, with the increase of planting years, the salinity content in the soil is gradually reduced and the soil is fertilized. In Dongying, terraces were erected to raise the height of the cultivated layer so that the brine in the ground could not reach the surface through the capillary phenomenon. A dark tube with small holes is buried at a certain depth in the soil, so that the salt water in the soil can be leached into the dark pipe, so that the salt can be discharged from the soil. Drip irrigation under film is commonly used in the Inland Northwest to create a weak alkaline environment and inhibit water evaporation while drip irrigation. Water plays a key role in all of these technologies. In the last century, China implemented a series of scientific and technological battles such as the "Huanghuaihai Campaign of Agricultural Science and Technology" and the "Bohai Granary" in the Huang-Huai-Hai Plain, and figured out the basic theory of saline-alkali land management - the law of water and salt movement, that is, "salt comes with water, salt goes with water". Therefore, washing salt (alkali) with water, pressing salt (alkali) with water, supporting irrigation and drainage, and salt with water are the most basic technologies. Generally speaking, at present, there are two major technical routes for saline-alkali land management: "suitable for planting" and "suitable for planting". In the early days, saline-alkali land management was mainly based on soil improvement. However, to completely reduce the salinity in the soil to zero, it is not only a large investment, but also difficult to achieve in practice. Breeding crop varieties suitable for saline-alkali land, so that "land change" and "replanting" and "two-way running" have become a more realistic choice in terms of efficiency and economy. At present, China has made positive progress in the breeding and promotion of saline-alkali tolerant varieties of rice, wheat, soybean, potato and other crops. From 2020 to 2022, 11 saline-alkali tolerant varieties were approved by the state, which can be planted under freshwater irrigation in moderate and mild saline-alkali land. In 2019, the national saline-alkali tolerant wheat variety test was established, and since 2022, a total of 6 saline-alkali tolerant wheat varieties have been approved by the state. The localities have also examined and registered some saline-alkali tolerant varieties such as rice, wheat, corn, soybean, potato, and sorghum. In the severely saline-alkali land where grain and oil crops are difficult to grow, suitable forage crops such as long-spike wheat grass, sorghum, forage corn, field cyanine, saline-alkali tolerant Chinese herbal medicine, forage grass, forest fruit and other special crops can be selected and bred, which can tap the agricultural production potential of saline-alkali land to a greater extent. In 2016, a large area of land in Wanfa Village, Honggang Township, Da'an City, Baicheng City, Jilin Province, was just a wasteland with Suaeda trees. In that year, the project brought water resources needed for the improvement of saline-alkali land to Wanfa Village, and also made Wu Zaizhou, who was doing business abroad, determined to change the face of the land. 
In 2017, Wu Zaizhou conducted the first trial of improved planting on the saline-alkali land of Wanfa Village, but it failed. Wu Zaizhou established a family farm in Da'an Zhaofeng Plantation, and successively transferred 7,800 acres of land in Wanfa Village to plant one season of rice every year. Through "planting rice and pressing alkali", the Da'an model of integrated and efficient management and comprehensive utilization of saline-alkali land developed by the team of researcher Liang Zhengwei of the Northeast Institute of Geography and Agroecology of the Chinese Academy of Sciences is adopted, and the acidic phosphogypsum amendment and saline-alkali tolerant rice varieties provided free of charge by the Black Soil Granary Science and Technology Battle Da'an Saline-alkali Land Paddy Field Demonstration Zone are used to reduce the salinity content in the soil little by little, and the rice yield is increasing year by year—— At first, a piece of land (15 acres) could only receive 1,000 catties, which slowly grew to 2,000 catties, and has grown to 1 in 20221 to 120,000 catties, this year is a bumper harvest, each land can harvest 15 to 170,000 catties. 
After years of continuous efforts, the rice in this field is growing well this year. Among many crops, rice is an important pioneer crop in saline-alkali land improvement. In some plots with a heavy degree of salinity, if irrigation conditions are available, the salt and alkali content in the soil can be greatly reduced by planting rice, so as to create conditions for planting other crops in the future. In addition, green manure plants such as rapeseed and field cyanosis are also regarded as potential pioneer crops because of their excellent performance in improving soil physical properties and soil fertility. "We will encounter a variety of problems, involving compacted soil improvement, the use of microorganisms, crop breeding and cultivation, the use of machinery to control the groundwater table, etc., which require the joint efforts of scholars from multiple disciplines. Our team members come from more than a dozen disciplines such as soil science, microbiology, breeding, cultivation, and water conservancy. Hu Shuwen likened the improvement of saline-alkali land to a "wooden barrel", and the "shortcomings" in each field may affect the results of saline-alkali land improvement. Desalination of the surface layer, prevention and control of salinity, fertilization of the cultivated layer, and improvement of soil fertility are the basic paths for the improvement of saline-alkali land. Saline-alkali land improvement measures can be broadly divided into four categories: engineering measures, agronomic measures, chemical measures and biological measures. In practice, it is necessary to integrate various technologies and measures to form "good land, good seeds, and good methods" to achieve the best results. Over the years, various regions have formed distinctive regional technology models, including the high-efficiency water-saving and salt-controlling technology model of drip irrigation under membrane in the northwest inland area, the "three controls and one reform" saline-alkali land ecological management model in the Yellow Irrigation Area of Northwest China, the "rice-alkali control" technology model in the soda saline-alkali land of the Songnen Plain, the high-efficiency green improvement model of "grain and grass rotation" in the coastal saline-alkali land, and the wheat and corn "ton grain field" model with high-standard farmland construction as the core in the Huang-Huai-Hai Plain.
A win-win situation of increasing grain and income
What kind of industries can be developed in saline-alkali land?The answer is the overall planning of grain, oil and feeding, the combination of agriculture, animal husbandry and fishery, the empowerment of wind and solar power, and the integration of primary, secondary and tertiary industries. The development and utilization of saline-alkali land is a big article, and the key lies in adapting measures to local conditions, according to the characteristics of local saline-alkali land, natural climatic conditions and resource carrying capacity, and precise policy. Using a combination of remote sensing inversion and ground sampling, Wang Jianlin, director of the Yellow River Delta Saline-alkali Land Agricultural Experimental Station of the Institute of Genetics and Developmental Biology of the Chinese Academy of Sciences, drew a map of the saline-alkali land distribution of Dongying City with a resolution accurate to 10 meters—64 of the 8,243 square kilometers of land are non-saline-alkali land80,000 acres, 189 mild saline-alkali land50,000 acres, 302 moderately saline-alkali land90,000 acres, 164 acres of severe saline-alkali land10,000 acres, 176 saline-alkali barren beaches50,000 acres. "Figuring out the base number is the premise and basis for the comprehensive utilization of saline-alkali land. Wang Jianlin said, "Comprehensively considering the degree of soil salinization, whether there are irrigation conditions, and the local natural endowment, we can accurately plan the appropriate leading industries in each region, and provide a basis for the decision-making of optimizing the agricultural industrial structure." According to the estimation results, the potential sown area of rice in Dongying City is about 360,000 mu, which is mainly distributed in the moderate to severe saline-alkali land along the Yellow River and the coastThe potential sowing area of soybean is 620,000 mu, mainly distributed in mild-moderate saline-alkali landThe potential sown area of wheat and corn is 1.85 million mu, mainly distributed in non-saline-alkali land and mildly saline-alkali land. The potential brackish water aquaculture area of coastal mudflats and heavily saline-alkali land has reached more than 1 million mu. Based on this, Wang Jianlin planned a characteristic industry suitable for each village - In Chenjiawuzi Village, Qianbi Village, and Qianshao Village, Lijin County, which are far away from the Yellow River and whose water resources are not enough to support rice planting, the model of "farming and fishing" is adopted, and 3,000 acres of perch and shrimp are extensively cultivated in the Taitian Pond. In Dongpan Village, Beisong Town, Lijin County, where irrigation is convenient, the rice-wheat double-cropping and water-drought rotation planting method is adopted: first plant one season of rice, use a large amount of irrigation to reduce the salt in the soil, and then plant another season of wheat, and reduce evaporation by mulching the ground to prevent "salt return". For the heavily saline-alkali land in Maotuo Village, Tingluo Town, Lijin County, the method of "occupying land without using land" is adopted - building winter warm vegetable greenhouses, using substrate cultivation, planting melons, cucumbers and other vegetables, and getting rid of the shackles of land through the development of facility agriculture. "In order to enter a virtuous circle in the comprehensive utilization of saline-alkali land, it is necessary to improve efficiency, farmers can make money, and this work can be truly implemented. Wang Jianlin said. Since 2013, Wang Jianlin began to use "rice flower fragrance" as the parent material to select and breed salt-tolerant rice varieties suitable for the Yellow River Delta, not only to produce excellent rice quality, but also to appropriately shorten the growth period, on the one hand, to reduce the consumption of water resources, on the other hand, to meet the growth needs of the next crop, the formation of rice and rape or wheat rotation planting mode. Wang Jianlin also developed an ecological agriculture model of rice-duck symbiosis in view of the unique geographical and water source conditions of the Yellow River beach area, and formulated the local standard of Shandong Province for "Rice-duck Symbiosis Technical Regulations", and the rice produced by this technology has obtained national organic certification and geographical indication products. "We often say, 'If the yield is not enough, the quality will make up'. Crops need energy to fight against a saline environment, so it is not realistic to pursue high yields on saline soil. But at the same time, crops produce a variety of flavor substances to fight the damage of adversity, so that the products produced in saline soil, whether in terms of taste, nutrient content, or antioxidant properties, are better than ordinary crops. Wang Jianlin said. In the "Research Report on the Unique Quality of Rice in the Yellow River Estuary" made by the Ministry of Agriculture and Rural Affairs, five rice varieties were selected, namely "Jinyuan U99", "Jindao 919", "Yanhuangxiangjing", "Zhongkefa 928" and "Xiaograinxiang", and the rice grown in the saline-alkali land of Dongying City was analyzed and compared with the rice produced in the non-saline-alkali land. The total antioxidant capacity was significantly higher than that of the same rice grown in non-saline-alkali land. The content of sodium, potassium, calcium, zinc, phosphorus and other minerals in the "Yellow River Estuary Rice" has increased significantly. "By cultivating high-quality varieties, implementing planting and breeding combined with organic planting, and creating a characteristic agricultural brand of saline-alkali land, we can achieve high quality and high price to increase added value, in the final analysis, in order to maximize the comprehensive benefits of each mu of land, so that farmers can obtain higher income. Wang Jianlin said. During the "14th Five-Year Plan" period, the Institute of Genetics and Developmental Biology of the Chinese Academy of Sciences took "creation and productivity improvement technology of suitable crops in saline-alkali land" as one of the three main directions of scientific and technological innovation. In the moderately saline-alkali land, the salt-tolerant forage crops are selected, the key technologies of grass planting, grass production and livestock raising are integrated, large-scale grass pastures are built, and the combination of grain and oil crop straw is formed to form a planting and breeding combination model of "forage production, cattle and sheep breeding, manure returning to the field, and soil fertility improvement" in saline-alkali land. In severely saline-alkali land, salt-tolerant pioneer plants were screened and domesticated to realize forage utilizationIn the coastal mudflats, the integration of saltwater fishery aquaculture technology, the construction of standardized fishing grounds, the realization of saline-alkali land and multiple water sources of comprehensive and efficient utilization, in the aquaculture water surface for photovoltaic power generation, in the fish pond dam for wind power generation. According to local conditions, a comprehensive utilization model of coastal saline-alkali land should be constructed to realize the gradual transformation from saline-alkali barren beach to farm, pasture, fishery and electric field. According to the characteristics of regional saline-alkali land, break through the technical bottleneck, integrate technology to establish an efficient model, and form a complete industrial system, saline-alkali land governance can embark on the road of sustainable development.
The new future of the whole industrial chain of "saline-alkali system".
On the road of saline-alkali land improvement, Wu Zaizhou has insisted on it for nearly 8 years. In October this year, when all the rice was returned to the warehouse, Wu Zaizhou couldn't hide his excitement: "The output has reached a record high, and it has caught up with the best grain, and it can earn nearly 5,000 yuan per land." Wu Zaizhou told reporters: "For the past 7 years, I have been losing money, and my hard work has finally benefited, and it is not easy to make money." I believe that every year will be better and better. Saline-alkali land is known as "land stubbornness", and its improvement is a worldwide problem, with high investment, slow effect, complexity, long-term and repetition. The improvement and comprehensive utilization of saline-alkali land is a systematic project, and it is necessary to make unified plans for the treatment of soil salinization of cultivated land, the development of reserve resources of cultivated land in saline-alkali land, the construction of farmland water conservancy infrastructure, and agriculture with special characteristics. It is necessary not only to develop low-input, high-efficiency technologies, but also to adhere to safety and green, and avoid pollution and damage to cultivated land and the environment. It is necessary not only to make a breakthrough in technology, but also to solve the problem of the low level of industrialization of special agricultural products in saline-alkali land, so as to fully reflect the benefits brought about by improving land. In order to further play the supporting role of science and technology, while carrying out basic research, it is also necessary to carry out systematic research in biology, chemistry, agriculture, water conservancy and other fields, and strengthen technological integration and innovation. At the end of 2022, the National Innovation Center for Comprehensive Utilization of Saline-alkali Land was officially approved. This is the fifth national technology innovation center in the agricultural field approved by the Ministry of Science and Technology after the corn seed industry, saline-alkali tolerant rice, dairy industry, and pigs, jointly established by the Chinese Academy of Agricultural Sciences and the people of Shandong Province, the Institute of Agricultural Resources and Regional Planning of the Chinese Academy of Agricultural Sciences, the Yellow River Delta National Agricultural High Zone and the Shandong Academy of Agricultural Sciences as the leading construction unit, and 18 advantageous scientific research institutes, universities, and universities in the United Nations. The joint construction of enterprises aims to focus on the research and development of core technologies and the engineering application of technologies, and promote the industrialization of major research results. "We hope that by 2025, we will build an internationally advanced national technology innovation center, break through a number of key core technologies of saline-alkali biological breeding, drive a significant improvement in the quality of cultivated land in saline-alkali land, and promote the high-quality development of agriculture in saline-alkali land. Mei Xurong, member of the party group and vice president of the Chinese Academy of Agricultural Sciences, and chairman of the National Technology Innovation Center for Comprehensive Utilization of Saline-alkali Land, said that the center focuses on the three directions of biological breeding of saline-alkali land, improvement of production capacity of saline-alkali cultivated land and ecological utilization of saline-alkali land, and breaks through the technical bottleneck of the entire industrial chain. Mei Xurong said: "We focus on four aspects of work, one is to build a collection, identification and evaluation system for salt-alkali tolerant germplasm resources, and cultivate new varieties of salt-alkali tolerance. The second is to improve the productivity of cultivated land, focusing on breakthroughs in saline-alkali soil soil improvement and rapid fertilization and other technologies. The third is to explore the ecological utilization of saline-alkali land, study the spatiotemporal allocation technology of plant crops in saline-alkali farmland and non-farmland habitats, especially to develop planting systems suitable for different grades of saline-alkali land, and explore ways of high-value utilization of suitable characteristic crops in saline-alkali land. Fourth, it is necessary to build a comprehensive innovation platform from basic theory to key technology to equipment products and utilization models. The whole industrial chain of "saline-alkali system" needs to play the role of "two hands" with the market, mobilize enterprises, new business entities, scientific research institutions, financial institutions, etc. to participate extensively, develop in an appropriate and orderly manner, and implement comprehensive policies for a long time. "In Shandong, we have approved a loan of 300 million yuan to support the northern irrigation project in Hanting District, Weifang through the model of 'Daoxiang Town + Agricultural Products Deep Processing Terminal Industrial Chain', which has opened up a policy-based financial path to support agriculture in order to improve the agricultural planting conditions in saline-alkali areasIn Hebei, the support path of 'large-scale planting + improved seed breeding and promotion + comprehensive improvement and utilization of saline-alkali land' has been explored to promote the yield of dry alkali wheat up to 600 catties per muIn Jilin, it launched exclusive products such as 'cultivated land transformation and upgrading loan', designed financing models such as comprehensive utilization of saline-alkali land, cultivated land quality and efficiency improvement, first-class chain, and regional overall planning, and approved 8.4 billion yuan of farmland loans to fully meet the financing needs of different enterprises. According to the person in charge of relevant financial institutions, in the next step, financial institutions will further promote model innovation and plan the comprehensive utilization of credit support for saline-alkali land from the perspective of the whole life cycle. Author:Farmer** China Rural Net reporter Yao Yuan