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Environmental Business Review | Wednesday, April 27, 2022
A new study indicates that soil's capacity for holding water will be essential to deciding how nicely farms in some regions of the US manage elongated heat stress due to climate change.
FREMONT, CA: A soil study indicates that the capacity for holding water will find out how well farms manage prolonged heat stress because of climate change.
Rises in average temperatures impart to declines in soil moisture, influencing crop production and debasing soil in the long term.
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Researchers say adding more amendments to enhance the water-holding capacity of the land and using more mulch to reduce evaporation could help farmers decrease heat stress on their crops.
Concurrently that farmers are facing more radical weather events because of climate change. They are managing the growing issue of soil degradation, the study's first author and assistant professor at Emory University's environmental sciences department.
Around a 750million people were underfed in 2019 due to the effects of climate change, including a decline in food production, hikes in food prices, and growing competition for land and water.
And the matter of global food security is anticipated to intensify. For instance, world crop yields are projected to decrease by 25% within the next 25 years because of climate change, yet global food production would need to double by 2050 to feed the projected growth in the human population.
Healthy soil
Keeping the soil healthy is essential to adapt to the climate crisis. Healthy soil includes microbes that provide the nutrients essential for healthy plants to grow, she explains, while supporting making the plant foods we eat more nutritious.
These microbes' presence also enhances the soil's ability to sequester carbon. Consequently, the top 30 centimeters (roughly 1 foot) of the world's soil includes about twice as much carbon as the total atmosphere, making soil the second-largest natural carbon sink after oceans, according to the United Nations Food and Agriculture Organization.
The increase in average temperatures still leads to declines in soil moisture in some areas, which can impact crop production while degrading the soil over the long term.
The water-holding capacity of soil
For the current paper, the researchers sought to evaluate the long-term impact of climate and soil properties on corn, soybeans, cotton, and wheat production around the mainland US. They dragged county-level data from the US Department of Agriculture from 1981 to 2015. Their dataset involves precipitation rates and accumulated average daily temperatures over a crop's growing season, named growing-degree days. The data also featured soil variations, and organic matter texture (the percentage of sand, silt, and clay), comprising retention capability, Ph, slope, erodibility, and soil-loss tolerance.
The researchers utilized an explainable machine-learning method to evaluate the influence of these climate and soil variables on crop yields. The results singled out growing-degree days as the most significant climatic factor and water-holding capacity as the most powerful soil property for crop-yield variability.
Clay soil & soil rich in organic material keep water better than sandy soil, she explains. Thus farms with sandy soil or soils possessing less organic material may want to add more amendments to improve the water-holding capacity of the land. Another likely adaptation is to utilize more mulch to decrease evaporation.
The researchers hope their findings will sustain farmers, land-management specialists, and policymakers in decision-making allied with sustainable and long-term soil-, water-, and crop management practices.
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