Both plants are the same variety and we’re the same size when transplanted. The smaller one is in older soil, the big in new soil. What is the soil deficient in to make the pepper not grow at all?

Both plants are the same variety and we’re the same size when transplanted. The smaller one is in older soil, the big in new soil. What is the soil deficient in to make the pepper not grow at all?

by BigBoiShane11