combustion and lightning gen.

[lavazza]

Речь идет о фиксации азота соей, это как-бы вступительная часть.
Как в данном контексте переводится lightning?
Human activities (mostly legume cropping and fertilizer production) have been suggested to result in the fixation of approximately an additional 150 Tg N year–1 in 1998. Non-biological inputs come primarily from fertilizer production, estimated to provide around 100 Tg N year–1 in 2008, up from 3.5 Tg N year–1 in 1950, with small amounts from combustion and lightning.

[Alexander Orlov]

освещение