Hello, Juan. I think what you call Veza is Vicia sativa. In Spanish it is called veza and arveja. Zalkea in Basque, and as I was recently told, txirta.

The mortar is leguminous, so it enriches the soil with nitrogen. The vegetables that will best come later are the ones that we take advantage of the leaf: escarole, acellular, lettuce, spinach...

Regarding lime, it is generally favored in soils with high concentration of N. Dance calmly. If you want to use ash, chopped limestone or raw or dead lime.