Fertilizer pH - select a nitrogen ratio for pH management
Enter the plant species. We currently have research data on petunia (a crop that raises pH); impatiens (an intermediate crop – use this as a default); and geranium (a crop that drops pH)
Enter the applied concentration of nitrogen (N) in parts per million (ppm). 100 ppm N = 100 mg/L N = 7.1 mmol/L N
Enter water alkalinity (which can be thought of as dissolved lime and is different from pH) in ppm.
1 meq/L = 1 milliequivalent/L = 50 ppm CaCO3 = 61 ppm HCO3-
Enter the concentration of ammonium-nitrogen (N) in either % or parts per million (ppm). Ammonium is strongly acidic
Enter the concentration of nitrate-nitrogen (N) in either % or parts per million (ppm). Nitrate is weakly basic.
Enter the concentration of urea-nitrogen (N) in either % or parts per million (ppm). Urea is somewhat acidic.