Listen in as John Kempf takes questions from the audience. February 2021. Topics include Sap analysis, biochar, cobalt, nutrient density, photosynthesis, soil structure, foliar sprays and more.
![Picture of John Kempf](https://cdn.kindharvest.ag/wp-content/uploads/avatars/24/5f7b58f5b6fdb-bpfull.jpg)
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