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Coffee grounds will substantially improve the availability of phosphorus, potassium, magnesium and copper and will probably negate the need for chemical sources of these plant essential elements.
The data indicates that 25-35 percent by volume coffee grounds can be blended with mineral soils of any type to improve structure of those soils.
Carbon/nitrogen ratio: On the basis of dry matter bulk density (452 lbs. per cubic yard), organic matter content (97.7%) and total nitrogen (2.28%), the estimated carbon/nitrogen ratio is about 24:1. This means that there is more than sufficient nitrogen present in the coffee grounds to provide for the nitrogen demand of the soil microorganisms as they degrade the organic fraction.
Over the long term the coffee grounds will act like a slow release fertilizer providing long-term nitrogen input which can then be utilized by plants.