Hi @papi.mati, my entry:

Tell me where are you from?
I am from Ghana.I reside in the northern part of it.

What green manure mentioned in the article can be used in your region?
Cowpea and pea are the only green manure used in my region.

Do you know any other green manure that fix nitrogen from the air and are in use as the fertilizer your area?

Yeah, legumes which includes;

Millet(panicum miliaceum):Millet is very important in our lives. It support healthy and regular digestion.It Is rich in fibre which helps to keep us regular and also reduce the risk of cancer.

Soybean(Glycine max):Soybean is edible,we can get soy nut and ice cream from it. It is also called sojabean.

Neem(Azadirachta indica): It can be used to cure diseases from the heart and sickness such as fever.

Thank you,
@papi.mati