COMPARISON OF THE MINERAL-COMPOSITION OF 12 STANDARD NUTRIENT SOLUTIONS

In the past, a large number of standard nutrient solutions has been de vised. To investigate if there is an essential difference between thes e standard solutions, the mineral composition of 12 standard nutrient solutions formulated between 1865 and 1994 are compared with each othe r. Half of these standard solutions contain ammonium (NH4+) in a milli molar range. The effect of elemental speciation of the micronutrients in the 12 standard solutions on bioavailability is compared. The macro nutrient composition is represented in trilinear coordinates, making a clear comparison of the proportions of both the cations and the anion s possible. Also the pH and the total amount of ions present are compa red.