It wasn't until the third century b.c. that techniques of rice cultivation (and wheel-made pottery) arrived from Korea, along with irrigation methods that are still in use today.
It was not until the third century that techniques of cultivation arrived.
However, this conclusion does not end the inquiry, because the question before the Commision is not whether an alien must be physically present in the United States, but when the alien must be present to be entitled for LSC representation.