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Plant Nutrition Plants need eighteen chemical elements for their growth—carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), potassium (K), sulfur (S), calcium (Ca), magnesium (Mg), iron

The Living Soil When soil organisms and roots go about their normal functions of getting energy for growth from organic molecules, they “respire”—using oxygen and releasing carbon dioxide to the atmosphere.

Organic Matter and Aggregates Organic Matter and Aggregates Organic matter occurs outside of aggregates as living roots or larger organisms or pieces of residue from a past harvest. Some organic matter

s Levels of soil organic matter may fluctuate during the different stages of a crop rotation. SOM may decrease, then increase, then decrease, and so forth. While annual row crops under conventional

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