Some aspects of relation between nitrogen metabolism inPisum sativum and mineral nutrition

Summary Plants ofPisum sativum grown in water culture were subjected to deficiencies in the macronutrients N, P, K, S, Ca, Mg, substitution of ammonium for nitrate and change in pH to pH 3 or 9. Free amino acids, soluble nitrogen, protein and glutamate dehydrogenase activity of shoots were measured for all nutrient types. Changes in amino acid concentrations correlated well with changes in glutamate dehydrogenase. It is considered whether this enzyme is indicative of the nutritional state of plants.