What could be the best way to prepare reference soil particularly for soil nutrients. How can we make sure this soil can used for organic matter and nitrogen analysis
There are groups that do this routinely. For example, look up WEPAL in the Netherlands and Global Proficiency in New Zealand
Check https://www.ecofarmingdaily.com/build-soil/soil-fertility/amp/
https://www.fao.org/3/a-at736e.pdf
You can use the analogy of reference crop evapotranspiration by FAO. This is soil with enough nutrients.
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