The densening of corn increases yields and reduces carbon emissions.

Original title: Corn dense planting can increase yield and reduce carbon emissions
Recently,
China
Academy of Agricultural Sciences Crop Science Research Institute crop cultivation and physiological innovation team jointly with 24 national scientific research teams, through multi-point multi-year experiments, revealed that in the current situation of excessive application of nitrogen fertilizer in China's farmland, corn planting density of 15,000 plants / hectare can significantly increase the yield of different regional seeds, but also reduce carbon intensity and increase environmental nitrogen recovery. The findings are published online in Resources,
and Recycling.
, according to Researcher Li Shaokun, increasing grain production and reducing environmental pollution are major challenges to food security and environmental quality assurance in the world today. Agriculture is an important source of greenhouse gas emissions, especially in the current situation of over-fertilization of farmland in many places, how to improve corn production without affecting the environment is an important international challenge.
's research team, through years of joint testing and comprehensive analysis of 42 test sites in the country's main corn producing areas, found that the planting density increased from 60,000 plants per hectare to 75,000 plants without additional nitrogen fertilizer inputs, with an average yield increase of 5.59%, and the life cycle evaluation (LCA) showed that the technology could significantly reduce carbon and nitrogen emission intensity by 2.2%-10.2%, significantly reducing nitrogen surplus. The study also found that the increase in the number of hectares of spike is the key to increased yield, the harvest index after the addition of no change, biomass increase is the main reason for the increase in yield. If the national farmers adopt this technology and combine the varieties to replace, the total annual output of corn can reach 290 million tons, close to the level of China's total corn demand of 315 million tons in 2030, while improving the recovery rate of nitrogen in the environment. The research results can provide theoretical reference for China's corn "grain storage technique" and quality efficiency production.
the research was funded by projects such as the National Key Basic Research and Development Program, the 13th Five-Year Plan for National Key Research and Development, the National Natural Science Foundation of China and the Science and Technology Innovation Project of the Chinese Academy of Agricultural Sciences.
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