Effect of the iron supply on the nutrition of different citrus variety/rootstock combinations using dris 1

The Diagnosis and Recommendation Integrated System (DRIS) has been found reliable in diagnosing nutrient requirements, despite changes in the tissue sampling or the time sampling. Relatively few researchers use the results obtained by hydroponic culture to make a DRIS data bank. In this work, results obtained in this way have been utilized as DRIS reference values to evaluate the iron (Fe) supply influence on the nutrition of different citrus combinations under normal and deficient Fe conditions. The DRIS indices have been compared with standard methods to evaluate the effectiveness of this system of interpretation. The Citrus macrophylla rootstock for lemons is more resistant to Fe chlorosis than Sour orange. Based on the diagnosis of visual symptoms, the Citrus volkameriana is more resistant to this nutritional deficiency for oranges than the Cleopatra mandarin.