Wednesday, October 20, 2021

Straw Can Enhance Soil Fertility and Reduce Ammonia Pollution

Straw incorporation — shredding and burying straw — has been widely promoted as an environmentally-friendly method to increase soil organic carbon stocks and improve soil fertility. Scientists have also found crop straw incorporation could help reduce ammonia volatilization from fertilized fields, which contributes to the formation of fine particles, thereby resulting in serious air pollution.

Still, scientists are not clear about the long-term effects, e.g., 15 years, of crop straw incorporation approaches and rates on ammonia volatilization from calcareous soils, which are hotspots for agricultural ammonia volatilization. Recently, Dr. Zhou Minghua and his team from the Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, investigated the effects of different long-term straw management practices on ammonia volatilization from calcareous agricultural soils under a subtropical climate.

Straw management and ammonia volatilization. (Image: Zhou Minghua)
Straw management and ammonia volatilization. (Image: Zhou Minghua)

Their findings were recently published in Atmospheric and Oceanic Science Letters. Zhou, the corresponding author of the study, said:

Zhou also points out that straw burning, a traditional practice carried out by Chinese peasants but strongly discouraged by the Chinese government owing to concerns around air pollution, resulted in one-third higher annual ammonia volatilization as compared with the incorporation of the same amount of unburned crop straw.

Taking into consideration both agronomical (e.g., soil fertility) and environmental performances, this study suggests that long-term crop straw incorporation could be a wise way for reducing ammonia volatilization while sustaining agricultural development.

Provided by:  [Note: Materials may be edited for content and length.]

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Troy Oakes
Troy was born and raised in Australia and has always wanted to know why and how things work, which led him to his love for science. He is a professional photographer and enjoys taking pictures of Australia's beautiful landscapes. He is also a professional storm chaser where he currently lives in Hervey Bay, Australia.

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