An evaluation of mineral analysis of ‘Verna’ lemons by DRIS

Abstract

The Diagnosis and Recommendation Integrated System (DRIS) norms of ‘Verna’ lemon Citrus limon (L) Burm f.] trees were obtained from field data. DRIS diagnoses agreed with sufficiency range in leaves sampled at a similar period as those of the norms. DRIS determinations were affected by rootstock and sampling date of the leaves. This approach failed to reveal under saline conditions if a nutrient deficiency is induced by an excess of salinity or by a deficient fertilization.