Okara is sometimes added to compost to add organic nutrients and nitrogen.

He grew peas in this field last year' they add nitrogen to the soil.

These clippings should remain on the lawn to decompose naturally and add nitrogen to the soil.

Together these organisms slow erosion, add nitrogen to soil, and help it to retain moisture.

Some plants add nitrogen to the soil, some take it out.

Should ambient temperatures have risen too much, the team had the ability to add liquid nitrogen to the mix to lower the temperature further.

In some instance, he said, there is evidence that the Sound adds nitrogen to the bays.

All of these practices directly add additional nitrogen to soils, which can then be converted to N2O.

Grass clippings add nitrogen to a lawn, he said, questioning why "everybody has to have their property so tidy looking."

Calcium nitrate is used in fertilizers to add nitrogen to the soil.