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Research by Taiwan's Ministry of Agriculture's TLRI indicates that interplanting Napier grass with sunn hemp increases carbon storage in forage fields and prevents soil acidification, unlike nitrogen fertilizers. Napier grass, introduced to Taiwan in 1961, has been studied under carbon-negative farming from 2023 to 2024.

While nitrogen fertilizers produced higher yields and crude protein, the combination of Napier grass and sunn hemp, along with reduced nitrogen usage, boosted soil organic carbon by 3.6% to 5.5% over three years, compared to 2.4% from nitrogen alone. Additionally, using cow dung showed similar benefits without altering soil pH.

The TLRI emphasizes that organic practices protect against soil acidification and enhance carbon sinks. Meanwhile, a carbon footprint assessment of bok choy from an organic farm in Taoyuan found 0.35kg CO2 equivalent emissions per 250g package, with production as the main contributor.