I did my last soil test 3 years ago, so it was time for a check. I still don't have the recommendations yet. But I generally know what to do and it helps that my friend is a soil scientist and can can steer me in the right direction
Yr Location pH P K Ca Mg soil type
2013 Wahiawa 7.6 212 472 7577 529 Heavy
2016 Wahiawa 7.7 153 292 8668 635 Heavy
Recommended: sulfate of ammonia (1.91 lbs/ 100 sq ft split into 3 application and organic compost. I added Peat moss (1.5 bales or about 4 inches over a 15x15 sq ft area. and 1/4 cup sulfur with 1/3 of the sulfate of ammonia to lower the pH.
Calcium and Mg are higher and in the high range. P and K have dropped. K is now in sufficient range. P and K were in very high ranges before. P has dropped from very high to high and calcium and magnesium have increased into the high range.
pH remains alkaline.
2013 Mililani 6.4 2154 452 3137 352 Heavy
2016 Mililani 6.0 1620 283 4399 816 Heavy
Recommended 1.53 lb/100 sq ft split into 6 applications of Urea.
The pH of 6.0 is actually the expected value on my soil test. The phosphorus is still in the very high range but it is no longer off the map. It has moved in that direction since I have been fertilizing primarily with sulfate of ammonia and the only source of other nutrients would have been the compost and residual citrus food from the potted plants. The acid fertilizers do bring the pH down.
The addition of compost in both gardens seem to be raising the calcium and magnesium levels in both gardens while decreasing the phosphorus and potassium. I had also reduced the amount of total sulfate of ammonia I had been using which would also affect the calcium and magnesium levels
The higher magnesium levels may be why my soil is harder to work even though it is deep and drains well.
I am going to add more of the alkaline compost that is made by the local composting facility is very alkaline with a pH 8.16. It should improve soil tilth and cec and keep the pH from dropping more. I have to see if I can find Urea in smaller bags than 50 lbs.
https://menehunemagichawaii.com.s64416.g ... eet(2).pdf