CCTV***Cultivated land is the lifeblood of grain production and the foundation of the sustainable development of the Chinese nation. For a long time, "ensuring quantity and improving quality" of cultivated land has been the core issue of ensuring food security.
At present, there is a problem of soil acidification in China's cultivated land, which restricts the productivity of cultivated land", Shen Renfang, deputy to the National People's Congress and director of the Nanjing Institute of Soil Science, Chinese Academy of Sciences, told CCTV reporters, "It is of great significance to carry out the management of acidified cultivated land and improve the quality of cultivated land to ensure food security and promote the implementation of the strategy of 'storing grain on the ground and storing grain in technology'." ”
Rooted in the field and studying soil protection for nearly 40 years, Shen Renfang led the team to undertake the third national soil survey, and did a lot of work in soil improvement, remediation of contaminated soil, and safe use of lightly polluted farmland. Since serving as a deputy to the National People's Congress in 2018, Shen Renfang has made recommendations on soil protection and improvement every year.
Soil acidification of cultivated land is widespread across the country, especially in the main grain-producing areas in the south and the northeast. Shen Renfang pointed out. "Soil acidification will cause nutrient loss in farmland, aggravate the damage of heavy metals such as aluminum and manganese to plants, and affect the quality of agricultural products."
The large amount of chemical fertilizer used in cultivated land in China is the main reason for accelerating soil acidification. Shen Renfang analyzed. The experiment found that after 20 years of continuous single application of chemical fertilizer, the pH value of a soil in Hunan increased from 57 to 45。"If the current farmland management model is continued, the problem of cultivated land acidification will be further exacerbated, causing harm to agricultural production."
Shen Renfang believes that at present, there are still problems in the treatment of cultivated soil acidity, such as limited accurate assessment research, insufficient attention to prevention, and lack of precise and long-term treatment technology. In the future, it is necessary to further "strengthen basic research, increase scientific and technological research, and accelerate technology promotion" in the management of acidified cultivated land.
At the 2024 National People's Congress and the National People's Congress, Shen Renfang put forward countermeasures to strengthen the management of acidified cultivated land in China, and continued to make suggestions and suggestions for soil protection. Specific measures include: comprehensively and systematically understanding the causes, occurrence mechanisms and main controlling factors of cultivated soil acidification in different regions of China; According to the characteristics of soil acidification in different regions, high-efficiency acid-lowering conditioners were developed to build high-efficiency and accurate acid-reducing technologies. Accelerate the application and promotion of new technologies and methods for the management of acidified cultivated land, and realize the comprehensive and long-term management of acidified cultivated land.