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Increasing Soil Organic Matter Through Organic Agriculture

Numerous scientific studies show that soil organic matter provides many benefits for building soil health such as improv­ing the number and biodiversity of beneficial microorganisms that pro­vide nutrients for plants, including fixing nitrogen, as well as controlling soilborne plant diseases. The decom­position of plant and animal residues into SOM can provide all the nutri­ents needed by plants and negate the need for synthetic chemical fertilizers, especially nitrogen fertilizers that are responsible for numerous environ­mental problems.

Organic (above) vs. conventional (below). The higher levels of organic matter allow the soil in the organic field to resist erosion in heavy rain events and capture more water.

The year 2015 was declared the International Year of Soils by the 68th UN General Assembly with the theme “Healthy Soils for a Healthy Life.” I was particularly pleased with the theme because this is a message that we in the organic sector have been spreading for more than 70 years, and at first we were ridiculed. Now there is a huge body of science showing that what we observed in our farming systems is indeed correct.

“Organic farming” became the dominant name in English-speaking countries for farming systems that eschew toxic, synthetic pesticides and fertilizers through J.I. Rodale’s global magazine Organic Farming and Gar­dening, first published in the United States in the 1940s. Rodale promot­ed this term based on building soil health by the recycling of organic matter through composts, green ma­nures, mulches and cover crops to increase the levels of soil organic matter as one of the primary management techniques.

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