What is the distribution of global photosynthesis?

Has anyone attempted to classify global photosynthesis? For example, what percentage of it occurs over land? What percentage comes from agriculture?

Same questions for total growth of plant mass.

There will of course be issues with definition and measurement. But any attempts at answers would still be interesting.

Roughly $\frac{2}{3}$ on land and $\frac{1}{3}$ in the ocean.