Hans Quistorff wrote:These are the figures I found for Yacon. 10 pounds per plant in our growing conditions according to supplier, Calorie calculators listed 54 calories for 100 grams and 90 calories for 1 ounce fresh root. It can be dried, juiced and reduced to syrup. I plan to eat it fresh over the winter liftin one plant each month so I went with the last figure for calculation. So that gives me 954 calories per pound times 40 pounds = 3616 per year for 4 plants. The 2 1 pound tubers that I ate over the last 2 weeks averaged about 2 ounces per serving eaten like a sliced apple. use period would be about 4 months so divided by 3 for the year. I hope that helps.
planting considerations: Can be started by planting corm in one gallon container and transplanted after last frost to full sun to 3 to 4 square foot area of deeply turned well drained soil. Needs a lot of water during heat of summer so possibly a plant for a grey water situation,
Well, good to know the yield is 10 pounds there. The suggested yield is a whopping 20-30 pounds per plant here... which is why I always opt for the lowest yields I can find so as not to lead people astray. I'd much rather expect 10 pounds and get 20-30 instead than expect 20-30 and only get 10.
I'm suspicious of the calorie numbers, though. 54 calories per 100g works out to 245.16 calories per pound (there are 454 grams in 1 pound, rounded up.) 90 calories per 1 ounce works out to 1440 calories per pound (there are 16 ounces in 1 pound.) That's quite a range, and much higher than the scientific literature has suggested (and is part of the reason I don't use calorie calculators as my sources... they often don't agree, especially on specialty crops.) I suspect that these figures might be coming from yacon syrup but were mislabeled as values for fresh root by accident.
I'd have to look up the study that Bill cites in his growing guide on Cultivariable, but assuming that he quoted the studies accurately, they give a value of 66 calories per pound for freshly harvested roots, and 100 calories per pound after a month of storage (because the undigestible FOS is converted to digestible sugars in storage.) He gives a few other suggestions for how one might increase the caloric value, such as storing them in the sun. I also suspect that the FOS might convert to digestible sugars with cooking, as is the case with inulin in sunchokes... in the latter, cooking times need to be long or cooking needs to include acid in order to get a high conversion to digestible starch.
Still, even at these lower figures, 1,000 calories per plant isn't shabby. If those 20-30 pound yields are possible, then 2,000-3,000 calories per plant is absolutely stellar.
If you have any studies that corroborate those larger values, I'd love to see them. There's still a lot that we don't know about this plant, and I'd love to see when and how they're harvesting, processing, and storing the roots to get those values. I know that the rhizome itself, and not just the storage roots, are technically edible... though it seems they tend to be on the more fibrous side. Perhaps the rhizome has more digestible carbohydrates than the storage roots and that's what the discrepancy is coming from. I don't know. But while I'd love for those higher values to be accurate, I don't want to accidentally make people think that they're growing way more calories than they actually are. That could lead to a world of hurt if someone decided to get a large percentage of their diet from yacon and those larger caloric values didn't pan out.
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