Abstract
A compilation of simple spectrophotometric techniques for the determination of components in a nutrient solution is presented. These techniques are suitable for the determination of nitrate, phosphate, sulfate, chloride, ammonium, and silicon concentrations. Protocols for these determinations are detailed together with examples of standard calibration curves for these nutrient elements obtained in our laboratory. These protocols enable the routine and sensitive measurements of nutrient solution composition requiring only a spectrophotometer and minimal use of other basic laboratory equipment.