Comparative DRIS [Diagnostic Recommendation and Integrated System] and critical concentration interpretation of papaya tissue analysis data
1992
Bowen, J.E. (University of Hawaii. Huo (Hawaii). Beaumont Agricultural Research Centre, Plant Molecular Physiology Department)
The Diagnostic Recommendation and Integrated System (DRIS) and a critical concentration approach were used to identify mineral nutrient deficiencies in papaya (Carica papaya L.) trees grown with defined nutrient solutions in sand cultures in the glasshouse and under commercial field conditions. DRIS indices for sand-cultured trees that manifested no mineral nutrient deficiency symptoms were all positive, indicating that no nutrients were limiting plant growth and development. There are several limitations to using DRIS to identify the cause of an apparent nutrient imbalance. It is difficult to determine if the limitations are a cause or an effect of the syndrome requiring follow-up studies under controlled conditions to determine the actual position. DRIS does not identify specific fertilizers nor the quanities that must be applied to correct nutrient deficiencies. DRIS does not prescribe corrective measures for alleviating toxicities.
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