Compost + cultivation = increased storage of organic C in the soil

An interesting and important study conducted for 19 years by the USDA National Institute of Food and Agriculture and the UC Davis College of Agriculture and Environmental Sciences, found that practices that increase soil organic carbon, such as the use of compost, help increase long-term soil carbon storage.

By moving beyond the surface level and literally digging deep, scientists at the University of California, Davis, found that compost is a key to storing carbon in semi-arid cropland soils, a strategy for offsetting CO2 emissions.

Briefly:cerchio carbonio suolo

  1. Conventional soils neither release nor store much carbon.
  2. Cover cropping conventional soils, while increasing carbon in the surface 12 inches, can actually lose significant amounts of carbon below that depth.
  3. When both compost and cover-crops were added in the organic-certified system, soil carbon content increased 12.6 percent over the length of the study, or about 0.07 percent annually.

That is more than the international “4 per 1000” initiative, which calls for an increase of 0.04 percent of soil carbon per year. It is also far more carbon stored than would be calculated if only the surface layer was measured. Continua a leggere “Compost + cultivation = increased storage of organic C in the soil”