Nitrogen mineralization is one of the most important aspects in soil nitrogen circulation.

氮的矿化是土壤氮循环中的重要环节之一。

youdao

Therefore, straw mulching is an efficient measure to maintain and improve the regime of soil nitrogen nutrition.

因此，秸秆施用是保持和提高土壤氮素营养的有效措施。

youdao

Enough manure application could improve soil nitrogen content, but chemical fertilizer contributed less to soil nitrogen level.

有机肥施用达到一定量后可以提高土壤中氮素含量，而化肥对于土壤氮素提高不明显。

youdao

Other plants take nitrogen out of the soil, but beans and other legumes replace it.

VOA: special.2009.03.24

They take nitrogen out of the air and put it in the soil.

VOA: special.2009.09.01

And as it breaks down, it naturally releases nitrogen into the soil.

VOA: special.2010.06.01

Rather than rotating corn planting with soybeans to replace soil nitrogen, many farmers are planting corn year after year and adding large amounts of nitrogen fertilizer.

FORBES: Biofuels: Fields Of Pipedreams

Companions or beneficial plants are included to attract insects for natural pest management while some plants are soil amenders providing nitrogen and mulch.

FORBES: Written by Matt Hickman

He acknowledged that any soil used to grow nitrogen-fixing plants or were fertilised for agricultural reasons would result in an increase in gases involved in the formation of ozone.

BBC: Invasive plant 'increases ozone pollution'