Ref1
https://books.google.com.my/books?id=M73NHx06Io4C&pg=PA117&lpg=PA117&dq=chinese+boxthorn+yield&source=bl&ots=zqmauBEvOz&sig=ACfU3U2zh7wne6jT4t_k4HUs4rAsfCnexA&hl=en&sa=X&ved=2ahUKEwjF7bzWwfngAhX573MBHdIXA0wQ6AEwDHoECAkQAQ#v=onepage&q=chinese%20boxthorn%20yield&f=false