From Primitive Technology.
Primitive Technology: Yam, cultivate and cook
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About This Video:
I planted a yam in a large basket like enclosure and then 6 months later harvested, cooked and ate it. My previous attempts at growing yams were stymied by wild pigs and scrub turkeys. On learning that yams are in the area, these animals will seek out any tubers planted and eat them. So my solution was to build a large basket like enclosure to protect the growing vine. 13 wooden stakes were hammered into the ground (an odd number being important in any weaving project) and lawyer cane harvested from the forest was woven between these uprights. The basket was about 1 m in diameter and about 75 cm high.
A large yam, partially eaten by wallabies from a location further down the creek, was dug up and carried to the site. A small pit was dug in the enclosure and the yam simply placed in it. The enclosure was then back filled with dead leaves for fertiliser. As time progressed the vine grew above the basket and a long pole attached to it so it could climb into the canopy making full use of the sun.
After 6 months and no maintenance, weeding or watering the yam had grown into two large tubers whereas the original yam had rotted away leaving a thin husk. The new tubers were dug up using a digging stick. As carful as I was, the yams sill broke off with more tuber still under ground. This portion will probably strike next season anyway. In the canopy, the vine also produced smaller tubbers called “bulbils”. These were collected in a pot to be used as seed yams for a larger garden I’m planning. You can eat bulbils as well but the larger yam is generally eaten instead due to its larger size.
To cook the yam a fire pit was dug about 30 cm in diameter and about 20 cm deep. Wood was piled above the pit and set alight. The hot coals then fell into the pit where rocks where added to retain heat. The coals were scraped aside and the large tuber was broken up and thrown on top. The coals were raked back over it and a fire started on top. This cooked for 30 minutes before being pulled out of the coals. The outer layer of the yam was charred black and burning but the inside was soft and well cooked. The yam was eaten while steaming hot and tasted similar to a potato but with a crunchier texture near the outside much like bread crust. Although bland, yams provide a good deal of carbohydrates and are eaten as a staple in certain cultures. The remaining large yam tuber was tied up in a tree where rats could not eat it (hopefully).
This form of farming is a good way to get around the conventional farming practice of clearing trees to make fields. Instead the yam vine uses the trees as scaffolding to climb on, allowing it to reach the light in the forest canopy. The basket enclosure worked well to keep forest creatures from eating the investment. It also formed a good in-situ compost heap to nourish the yam as it grew. In future, I’d add sand to the mix as yams tend to do well in sandy soil and I expect it would be easier to dig up. Yams do well in dry conditions but will yield more if well-watered so digging a water retaining pit might help. Despite the large size of the yams I grew relative to ordinary potatoes, much larger ones are possible and are indeed routinely grown. The largest one from my research was 275 kg, grown in India. Yams have 116 calories per 100 grams compared to potatoes at only 93. They store well in the dry season as they are adapted to having a dormant period during these conditions. They are versatile in that they can be cooked into chips, roasted, boiled, mashed and made into a type of dough called “fu fu” typically eaten with stews.
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