Answer:
New types of rice and new growing techniques yielded bigger harvests.
Step-by-step explanation:
The Tang Dynasty, generally considered the golden age of Chinese culture, was founded by the Lǐ family, which took power during the Sui Dynasty's decline and collapse.
It was during the Tang Dynasty that the Silk Road was reopened, which allowed the increase in maritime trade in sails. The Tang managed to gain many new technologies, cultural practices, rare luxuries and foreign items. Cultural practices allowed rice cultivation to improve, agricultural waste and losses became smaller, new varieties of arable land were discovered, and increasingly technological agricultural practices allowed huge harvests. Which made rice increasingly popular in China.