That is a valid concern. I am no expert in sericulture, so i relied on third party info to make that estimate, specifically this site for info on mulberry production and this site for silkworm production. Here are the relevant quotes from these sites:
So, based on that, some simple math:
- 14 acres x 4,000 trees/acre = 56,000 trees.
- 56,000 trees x 2 kg/tree = 112,000 kg of mulberry per harvest
- 112,000 kg mulberry / 1,500 kg needed per 8 kg silk = 74.67 kg x 8 kg of silk = 597.33 kg of silk per harvest.
- 3-5 harvests a year, so 3 x 597.33 kg = 1792 kg and 5 x 597.33 kg = 2986.67 kg
Since Kim is using irrigation, i expect that will ensure that he will have a higher yield and more harvests per year, so i rounded it to a simple ballpark 2-3 metric tons of silk annually.
I don't know how the 10x the current facility factors in, but I assume it to mean that it cannot attain metric tons at least in its current state, but could possibly be expanded to meet that production rate.