COMPARISON BETWEEN THE H2SO4-H2O2-LI2SO4-SE OXIDATION METHOD AND ALTERNATIVE DIGESTION PROCEDURES FOR PLANT NUTRIENT ANALYSIS

Ca, Mg, Na, K and P contents of 3 plant tissues obtained by H2S04-H202-Li2S04-Se peroxidation digestion were compared with those determined by mixed acid (HN03-H2S04-HC104) and dry ashing procedures. Differences between methods were not consistent between elements or tissue types but the mixed acid digestion generally yielded higher Ca, Mg and P values than did dry ashing and peroxidation. Tissue K contents estimated by both wet digestion techniques were not significantly (P ≤0.05) different. Differences in Na values between digestion methods were highly inconsistent between tissue types and the precision of the Na data was Copyright. © 1979, Taylor & Francis Group, LLC. All rights reserved.