To convert 120 pounds per acre to ppm just multiply 120 pounds per acre by 05 which is to equal 60 ppm. This means that 1 part per million is equal to 1 milligram per liter. PPM or parts-per-million is a way of expressing very dilute concentrations of substances.
PPM is short for parts per million which is exactly as it sounds.
How much is mgkg to ppm. X ppm 10000 x. Assuming you are converting the mass of a substance the conversion of mgkg to ppm is 11. In other words mgkg is not mg of water to kg of water it is mg of x in kg of y.