Which one of the following statements is correct?
1
Ectomycorrhizal associations predominantly reduce phosphorus limitation, and endomycorrhizal associations reduce both nitrogen and phosphorus limitation.
2
Endomycorrhizal associations predominantly reduce phosphorus limitation, and ectomycorrhizal associations reduce both nitrogen and phosphorus limitation.
3
Ecto-and endo-mycorrhizal associations do not reduce nitrogen and phosphorus limitation.
4
Ecto-and endo-mycorrhizal associations are able to reduce only phosphorus limitation.