With the development of low-carbon economy and delaying climate change, it has become an international hot topic. Low-carbon agriculture, as an important part of achieving the goal of low-carbon economy, has gradually been favored by people because of its characteristics of low investment and quick results. However, at present, the development of low-carbon agriculture in China is facing a severe situation, and it is difficult to improve nitrogen management. In particular, chemical nitrogen fertilizer is widely used in excess. The China Low Carbon Agricultural Technology and Policy Symposium held in Beijing on March 19 demonstrated the cooperation between China and the United Kingdom in the “Improving Agricultural Nutrient Management—Developing a Low-Carbon Economy†project for the past three years and has devoted itself to optimizing nitrogen fertilizer management research. "In China's grain production, nitrogen fertilizer plays a huge role. In the future, nitrogen fertilizer will remain an important guarantee for food security," said Professor Zhang Fusuo, director of the Center for Resources, Environment and Food Security at the China Agricultural University. However, a large number of recent studies have shown that the amount of nitrogen fertilizer in the country exceeds the need for high crop yields, of which more than one-third of farmland's nitrogen fertilizer is over-used. In economic crops, especially vegetables and fruit trees, excessive nitrogen fertilizer input has become a common phenomenon. Excessive and non-standard nitrogen fertilizers have led to increased soil acidification, increased agricultural input costs, energy consumption and water pollution, and the resulting greenhouse gas emissions have also received increasing attention. The project team quantified China's greenhouse gas emission of nitrogen fertilizers through the fertilizer industry survey data, farmer household survey data, national fertilizer test data, and domestic and foreign literature data, and used greenhouse gas as an environmental assessment index to combine crop farming system characteristics with Social and economic conditions have explored technologies and policy measures to optimize nitrogen management and reduce greenhouse gas emissions. Through case studies in four provinces of Jiangsu, Shandong, Shaanxi and Jilin, the project team actively promoted all levels of Chinese government to reach consensus on nitrogen fertilizer management. In many rural areas of China, farmers continue to spread their handicrafts 50 years ago, and most farmers apply 50% of their nitrogen fertilizers to crops and use one-time fertilization. The nitrogen fertilizer utilization rate is less than 30%, and the amount of nitrogen fertilizer input is much greater than the actual demand and absorption of crops. Many farmers have the idea of ​​"how much better" when applying fertilizers. In fact, excessive use of nitrogen fertilizers destroys the roots of plants, making crops more susceptible to pests and diseases, directly affecting food production and threatening food security. In addition, excessive application of nitrogen fertilizer also increases the environmental pressure caused by greenhouse gas emissions. The project team analyzed the experience of Europe and the United States and the reasons for over-fertilization in China. It concluded that China's need to reduce nitrogen fertilizer application requires comprehensive measures. There are nine aspects of technology and management strategies, including adjusting fertilizer use to a reasonable level and requiring fertilizers in crops. In the period of time, fertilizers were applied, manual application was changed to mechanical deep application, organic nutrient recycling was used, and large-scale irrigation was applied to drip pipe fertilization to upgrade fertilizer products. As for how to integrate innovative technologies in line with local conditions and simultaneously achieve nitrogen fertilizer efficiency reduction, farmers' income increase, and grain production increase, the project team made recommendations: design the total amount of nitrogen fertilizer control indicators, and reduce blind fertilization through guidance and even regulations; develop sub-fertilization instead of Once fertilization, ensure that the fertilizer is used at a critical time, increase the utilization rate and reduce the loss; accelerate the advancement of machinery fertilization and water and fertilizer integration technologies; strengthen the upgrading of fertilizer products, improve the existing product structure, and greatly reduce energy consumption. In addition, measures can be established to explore and optimize the demonstration areas. "Achieving these will be a contribution to China's 40% to 45% reduction in greenhouse gas emissions per unit of GDP by 2020." "The realization of low-carbon agriculture requires the correct technical guidance on the one hand and policy support on the other." In this regard, the project team made recommendations and hoped that the state will introduce measures to strengthen the recycling of organic nitrogen fertilizer in animal manure and carry out effective Farmers' training and services promote the development of water and fertilizer integration with "drip irrigation and fertilization" as the core. Kn95 3D Mask,Kn95 Face Mask,Kn95 Filters Mask,Kn95 Cup Face Mask Jiangmen anjian biotechnology co. LTD , https://www.anjianmask.com