N cycle - True or false

1. To test your understanding of the N cycle in the soils, answer the following true or false questions:

- Most of the transformations of N in soils come from the process of the oxydation or the reduction of the N atom in biochemical reactions.

- In agricultural agroecosystems, it is needed to take into consideration, for the fertilisation of cultures, the amount of N brought by the process of symbiotic fixation that leaves a certain amount of N for the next culture.