"good, general feeding regimen should supply between 75 and 125 ppm N per week. Don’t let that scare you – it’s easy to translate that to easy to use measurements:
◙Divide 8 by the %N in the formula. The result is teaspoons/gallon to mix for the middle of that range, giving you room to round up or down for measuring convenience. Here are a few examples:
•K-Lite Orchid/Epiphyte Fertilizer contains 12.9% nitrogen. 8/12.9=0.62. Anywhere between 1/2- and 3/4 teaspoons per gallon keeps you in the recommended range.
•MSU Fertilizer for Well Water contains 19% nitrogen. 8/19=0.42, so use 1/3 to 1/2 teaspoon per gallon.
•Miracle-Gro Orchid Food is a 30% N formula. 8/30=0.267, so 1/4 teaspoon/gallon is appropriate."
Barbara Iverson
Barbara K Iverson 