Properly managed intercropping systems with green manuring and component crop population densities can promote gains in crop productivity and benefits that extend to the post-harvest quality of their products. Thus, the objective of this study was to evaluate the post-harvest quality of the beet-cowpea intercropping at different equitable amounts of hairy woodrose (Merremia aegyptia) and roostertree (Calotropis procera) biomass in the doses of 20, 36, 52, and 68 tha-1, on a dry basis, and at cowpea densities of 80, 120, 160, and 200 thousand plantsha-1, in two crops in a semiarid environment. The cultivars planted were beet 'Early Wonder' and cowpea 'BRS Tumucumaque'. The highest values of the beet post-harvest indices for pH (6.41), soluble solids (10.07 degrees Brix) and titratable acidity (0.14% citric acid), respectively, were achieved in the combinations of equitable amounts of M. aegyptia and C. procera biomass of 68 tha-1 added to the soil at population densities of 145, 110 and 200 thousand cowpea plantsha-1, while the highest values for total soluble solids (7.32%) and betalain (55.90 mg 100 g-1), respectively, were achieved in the combinations of equitable biomass amounts of the green manures of 68.00 and 47.90 tha-1 added to the soil at the population density of 200,000 cowpea plants per hectare. The highest contents of bioactive compounds in immature cowpea grains were reached at the maximum cowpea population density (200,000 plantsha-1) and at the highest biomass amount of the green manures, hairy woodrose and roostertree, of 68 tha-1.