Great customer service by GG, I asked them few questions about their mineralized phosphate (0:9:0) in terms of how it differs from their rock phosphate (0:3:0) via direct message on FB and they provided answers to all of them.
"Our Mineralized Phosphate is definitely more popular than our Rock Phosphate as it is quite hard to get! Our mineralized phosphate is actually fossilized bat guano from thousands of years ago. This is why the P value is much higher on this product than our rock phosphate. Many Gardeners who enjoy our All-Purpose and Powerbloom pair it with Mineralized Phosphate due to this reason!"
When I asked if one is faster release than the other: "All of our products are slow release however, with the higher NPK value you will get more of it but we cannot guarantee it will be quicker."
"The maximum annual rates given on our labels are industry regulated and not necessarily what your soil or crop requires. For Rock phosphate, a reasonable application rate for most gardens and plants would be 11.5 lbs per 1000 ft2. For Mineralized phosphate, with a higher percentage of available phosphate, a comparable application rate would be 3.8 lbs per 1000 ft2." [These are different rates of application than stated on their label and website, and make more sense because these recommend a lower rate for the MP than the RP wheres the label/website recommend a lower rate for the RP than the MP.]
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