A certificate that reports CBD as a percentage describes concentration in the sampled material. To compare the amount of CBD produced by two crops, the weight of harvested material matters too. An indoor cannabis experiment showed how those measures can move in opposite directions.
The investigators tested organic and mineral fertilizers at three nitrogen concentrations. Nutrient stress lowered flower yield at the final harvest but raised CBD concentration. In the comparison between 160 and 240 mg nitrogen per liter, the lower-input regimen retained about 95% of the CBD yield using one-third less fertilizer.
A higher percentage can coexist with a smaller total CBD yield if flower mass falls. A meaningful production comparison needs a common weight basis, matched sampling and separate figures for concentration and harvested mass. The 95% figure belongs to this cultivation experiment. Changes in genetics, nutrient delivery or harvest timing can alter the relationship.