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pulaka
(詳細はCyrtosperma merkusii, or swamp taro, is a crop grown in Tuvalu and an important source of carbohydrates for the area's inhabitants. It is a "swamp crop" similar to taro, but "with bigger leaves and larger, coarser roots."
The same plant is known as babai in Kiribati, ''puraka'' in Cook Islands, ''pula’a'' in Samoa, ''via kan'' in Fiji, Pulaka in Tokelau, ''simiden'' in Chuuk, ''swam taro'' in PNG, and ''navia'' in Vanuatu.〔(【引用サイトリンク】url=http://www.fao.org/docrep/013/am014e/am014e04.pdf )〕
Pulaka roots need to be cooked for hours to reduce toxicity in the corms, but are rich in nutrients, especially calcium.〔 Pulaka is an important part of Tuvalu cultural and culinary tradition, now under threat from rising sea level and displacement from the growing use of imported food products.
==Cultivation==
The crop is grown in pits dug into the limestone atoll〔 and is fertilized by adding leaves from different plants. The plants derive water from the freshwater lens found a few meters below the atoll. As such, the cultivation of pulaka is threatened by rising sea levels caused by global warming: the plant does not thrive in the salt water which seeps into the pits:〔 it rots the roots, turns the leaves yellow, and stunts the plant's growth. These saltwater intrusions occur more so now that the high tides have become higher, and more frequently flood the islands.〔 To alleviate the problem of saltwater pollution, some islanders have begun to line the pits, side and bottom, with cement.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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