An experiment was conducted by EPAMIG to assess the efficiency of Super Greensand on coffee yields. The control group received zero potassium, whereas the treatment group received potassium from Super Greensand. Super Greensand increased the concentration of macronutrients P, K, Ca and S and of micronutrients Zn, Cu, Fe, Mn and B.

Increased concentration of macronutrients (%)

P Total 83.33
P Avail. 12.37
K 57.48
S 9.28
Ca 2.99

Increased concentration of micronutrients (%)

Zn 26.27
Cu 24.27
Mn 20.25
B 20.25
Fe 8.83