The question asks about the specific field for which Dr. C Anandharamakrishnan received the Rashtriya Vigyan Puraskar 2024 in the Vigyan Shri category.
Dr. C Anandharamakrishnan was honored with the Rashtriya Vigyan Puraskar 2024.
Therefore, Dr. Anandharamakrishnan's recognition was for his significant work and contributions specifically within the domain of Agricultural Science.