In which year did Nandalal Bose join Kala Bhavana?

1921-22

Answer: 1921–1922
Nandalal Bose joined Kala Bhavana in 1921–1922.

Nandalal Bose in 1921–1922 joined the Kala Bhavana. His training under Abanindranath Tagore made him familiar with nationalism in art but it did not hinder him from allowing his students and other teachers to explore new avenues of artistic expression.