A good rule of thumb to go by is minimize your variables. By that I mean use the same person/firm to sample the soil and keep with the same lab as their extraction techniques vary. No field will ever sample exactly the same year to year so you are looking to build a picture and keep an eye on...
If anyone is genuinely interested in whats in Soil Fertility's Bettergrass products or the Humic SCG .... give them a phone call 01366 384899 or an email, [email protected], they will be able to send you the data sheets on the products...... "Best to be informed than an uneducated guess."
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