Eradicating hunger, achieving food security, improving nutrition and promoting sustainable agriculture are important goals of the United Nations 2030 agenda for sustainable development. Nowadays, more and more countries combine their natural resource conditions, update their development ideas, make use of scientific and technological innovation, and constantly explore new models of agricultural development. With the increasing global population, how to use limited land resources to meet the growing food demand has become a common topic in front of all countries. Using artificial intelligence and other technologies to achieve accurate management; Improve soil environment and advocate organic planting; Increase capital investment and promote the popularization and application of agricultural science and Technology... In the face of development opportunities and challenges, some countries have adopted policies and measures suitable for their own conditions to promote the sustainable development of agriculture. Efficient output and health orientation The Netherlands is an important exporter of agricultural products in Europe. Vegetables, milk and flowers from the Netherlands are necessities of daily life for many Europeans. The Netherlands has a temperate marine climate with more precipitation and less illumination time. In order to make up for the lack of natural conditions, local agricultural development pays attention to the use of science and technology and strives to achieve efficient output. "Produce double food with half the resources" has become the slogan of the Dutch agricultural community. Jacob runs a potato farm. Since the introduction of automated management system, he has spent more and more time consulting databases, satellite maps and communicating with artificial intelligence technicians. This system can accurately calculate the irrigation water and fertilization required for the planting of each agricultural product. It is reported that the average consumption of 9.5 litres of water per kilogram of tomatoes is far lower than the world average; The amount of water, pesticides and chemical fertilizers required for potato planting decreased by nearly 90%. In December 2018, the world's first "floating farm" was built in Rotterdam port. The farm is located on the water surface of the port and is divided into three layers. The upper layer is a dairy feeding area, a cow stables area with rubber floors and a highly automated milking area; The middle layer is used for processing milk, collecting and processing desalinated seawater, etc; The lower layer is a floating base made of concrete, which can ensure that the farm is not affected by the rising and falling tide of sea water, and can also move the farm to other water surfaces. There is a greenhouse at the bottom of the farm for soilless cultivation of forages, and LED lamps are used to increase the illumination time and promote the growth of forages. At the same time, the farm also makes full use of recyclable materials. A considerable part of the feed for dairy cows comes from waste grain produced by local breweries and grass cutting in nearby parks and golf courses, which greatly reduces the feeding cost. The "floating farm" is not far from the residential area, which reduces the cost of long-distance transportation and makes the milk fresher. Peter Van wengden, an engineer who provides the idea of "floating farm", believes that with the enhancement of people's health awareness and the rapid promotion of urbanization, the food production system also needs to be updated and upgraded. "At first people thought the idea was strange, but now more and more people accept and like the idea." Protect soil and return to organic In a farm in Puebla state in East Central Mexico, farmer Camilla is carefully checking the color of the soil. She observes the weather and monitors insects every day to comprehensively judge the farming situation. Camilla, 56, grew up farming. In 2019, Puebla state experienced drought, and this area relying on traditional agriculture suffered a serious impact. People began to realize the importance of environmental protection, actively advocated the concept of organic planting and sought sustainable farming methods. "If people grow crops in a healthy way, they can eat more nutritious food. We must learn to listen to nature," Camilla said More than half of Mexico's land is arid and semi-arid all year round. Improving soil conditions, restoring soil productivity and finding alternative crops with less water demand have become important measures to achieve sustainable agricultural development in Mexico. In Guanajuato state, the precipitation in rainy season is only about 500 mm. It is found that the local rich tequila can absorb a lot of carbon dioxide at night and reduce water loss. The soil environment was significantly improved by intercropping agave with legumes that can fix nitrogen and supplement soil fertility. After mixed fermentation, the two plants can also be made into animal feed for only 1 Mexican Peso per kilogram (US $1, about 20 Mexican pesos). This farming technology is welcomed by local farmers. In order to promote the development of organic agriculture, the Mexican government has successively issued the organic products law, organic production guidelines and use rules, and established the National Organic Production Committee. Mexican enterprises encourage young people to actively study organic agriculture by holding challenge competitions and other means. The winner can not only get rich bonuses, but also participate in the projects proposed by himself to make the idea a reality. According to the data of the Ministry of agriculture and rural development of Mexico, at present, 2 million hectares of land in Mexico has been used for organic planting and wild plant collection, mainly including coffee, corn, alfalfa, guava and lemon. Homero bras, President of the Mexican organic producers association, said that more and more farmers are abandoning the use of agrochemicals and turning to organic production. The development of organic agriculture in Mexico has great potential. Using science and technology to save resources Saudi Arabia has a hot and dry climate and small precipitation. Limited by the natural environment, it is impossible to develop large-scale planting, and fine, characteristic and water-saving agriculture has become its key development direction. Red Sea farm is an agricultural technology company headquartered in Saudi Arabia. Relying on King Abdullah University of science and technology, Red Sea farm has developed a high-tech greenhouse designed to combat hot weather by keeping crops cool. The greenhouse uses a lot of salt water to maintain the cooling system, which can reduce the fresh water demand of the farm by 90%. Ryan rivers, CEO of the company, said that this technology provides a reference for countries and regions with small freshwater reserves. In order to save and make rational use of water resources, Saudi Arabia has also issued "good agricultural practices", focusing on the use of resources in various production stages, and providing suggestions on agricultural water use, biodiversity protection and ecological balance. In 2019, Saudi Arabia launched the agricultural and rural development plan, and the government and agricultural development fund invested about 8.75 billion Riyals and 3 billion Riyals (1 US dollar about 3.8 Riyals) respectively to promote agricultural diversification and promote food security and sustainable development. That year, the agricultural technology company "hummingbird technology" obtained an investment of about US $9 million. The company's business is mainly to produce high-resolution maps by using UAV equipment to provide farmers with crop data analysis. The research team of King Abdullah University of science and technology recently developed plant-friendly polymer ultrafine microneedles, which can observe the health status of crops in real time by using ultra-thin sensor technology. Mark tast, Professor of plant science at the University, believes that "in the future, digital technology, engineering and biotechnology innovation will play an important role in the sustainable development of agriculture in the Middle East." According to the development plan of Saudi Agricultural Development Fund for 2021-2025, it will continue to support the development of major agricultural sectors, including poultry breeding, greenhouse cultivation and aquaculture. At the same time, the fund will play a role in credit support, focusing on agricultural investment and financing and agricultural supply chain construction, so as to accelerate the transformation and upgrading of sustainable agriculture. (outlook new era)