James Duke’s Phytochemical and Ethnobotanical Databases to develop a spreadsheet of dynamic accumulators showing the amount of nutrients they accumulate. in One Thing Leads to Another had a look at dynamic accumulators and used Dr. ![]() Maybe comfrey accumulates other important nutrients? If the above link does not work try this one: What About Other Nutrients? Using this criteria comfrey is not a dynamic accumulator for NPK. It seems reasonable to consider them to be average plants.When you compare comfrey at 3-1-5, it is not much better than the average list – it is certainly not ten times better. References 2 and 3 provide values for organic fertilizers which give us some values for NPK.Īre these average plants? None of the above plants are dynamic accumulators (ref 4), so they are not considered to have high NPK values. If you know of one, please post the link in the comments. I thought it would be easy to find such a list, but I couldn’t find a good one. These two values are fairly similar so for the purpose of this discussion I’ll round things off to 3-1-5. The book, Comfrey, Past Present and Future, (as per ref 1) reports an NPK of 3-1-4.8 (converted to dry weight). ![]() Stephen Legaree (see video below) had some comfrey analyzed and came up with the following dry weight value for total NPK, 3.5-1.2-8.4. How does the nutrient content of comfrey compare to an average plant? A common claim is that comfrey contains high levels of nitrogen, phosphorus and potassium. In my previous post I refined the definition to the following:Ī dynamic accumulator is a plant that will absorb and retain, in the leaf, at least one nutrient at levels that are at least 10 times higher than the average plant. I discussed the definition of dynamic accumulator in a previous post Dynamic Accumulators – Do They Exist? If we use the common definition for dynamic accumulator all plants would qualify.
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