What is the fine-grained topic of the following text: LUDHIANA: “Although a prized fruit, apple with its unique taste and nutritional value is typically a temperate fruit requiring winter chilling below 7 degrees Celsius, which is why the commercial cultivation of apple in the country is being done in high ranges of Jammu and Kashmir and Himachal Pradesh,” said PAU director of research, Dr Navtej Singh Bains. Only return the topic.
Commercial cultivation of apples in India