Plant analysis interpretation based on a new index: Deviation from optimum percentage (DOP)
- 1 July 1993
- journal article
- research article
- Published by Informa UK Limited in Journal of Plant Nutrition
- Vol. 16 (7), 1289-1308
- https://doi.org/10.1080/01904169309364613
Abstract
The objective of the present work is to introduce a new index (DOP: Deviation from Optimum Percentage), as an alternative methodology for plant mineral analysis interpretation. The DOP index is calculated for each of the analyzed elements by applying the following general formula: DOP = [(C x 100yCref] ‐ 100, where C is the nutrient concentration in the sample to assess and Cref is the optimal nutrient concentration used as a reference value. The calculations used to obtain the DOP index can be easily implemented in a microcomputer. An optimum nutritional situation for any element is defined by a DOP index equal to zero. The DOP index permits to know the nutrient limitation order in a given sample, giving information similar to that obtained with the DRIS method. Furthermore, the DOP indexes indicate wether a element is in defect (negative indexes) or excess (positive indexes). For comparison, the DOP index has been applied, together with other traditional methods including the DRIS approach, to a new nutrient database from a peach tree study and to other available databases from the scientific literature. Other examples are shown indicating the different behavior of DRIS and DOP method when nutrient contents change.Keywords
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