There is room between rows for alternating cash crops plus ample room for drainage between every row of HU. The drainage system has allowed the HU plants (which are cacti) to thrive despite the heavy rains.
10-K "JHST cultivates 187 acres of Hylocereus Undatus in Guangdong Province."
There is no such thing as Chinese acres in the reports. They either mention mu or (US) acres.
What I can tell from the picture, is that it is roughly 400m wide and 1,000m in length. Or roughly 100 US acres. Probably more than that. Definitely more than 38.