Why is Sri Radha's name
not mentioned in the
Srimad Bhagavatam ?
Sri Radha's name is not mentioned directly in Srimad Bhagavatam because Sri Sukadev Goswami, being the topmost rasika bhakta, would enter samadhi by just once hearing the divine name of Sri Radha. Such a state of unconscious bliss would last for many days. Parikshit Maharaj had just seven days before his death, thus Sukadev Goswami avoided directly uttering the name of Radha, and instead hinted about Her by the word "aradhana".
In other Puranas the descriptions of Sri Radha are given directy, especially in Sri Brahma-vaivarta Purana. The circumstances involving the recitation of these Puranas did not limit Sukadev Goswami to seven days, and thus the Rishis of Naimisharanya were able to accommodate Sri Sukadev Goswami's loosing external consciousness and entering samadhi.