That atmosphere is more than 95 percent carbon dioxide, with less than 4 percent nitrogen and only negligible traces of free oxygen.

Soils with humus can vary in nitrogen content but typically have 3 to 6 percent nitrogen.

(Ordinary air has about 21 percent oxygen and about 78 percent nitrogen.)

The result is a treated ammonium nitrate solution that contains 1 to 4 percent nitrogen, a primary plant nutrient.

The 58.5 percent nitrogen reduction target has broad support from environmental groups in both states.

Their results showed that clippings could return as much as 50 percent nitrogen when allowed to remain.

Yet the Earth's atmosphere currently consists of about 78 percent nitrogen, 20 percent oxygen and 2 percent other gases.

It contains 60 percent corn protein that is 10 percent nitrogen.

At 10 percent nitrogen by weight this would be a nitrogen application of 2 pounds per 1,000 square feet.

More than ninety-five percent of the Martian "air" is carbon dioxide; nearly three percent nitrogen.