Deviation from Optimum Percentage (DOP) Reference Levels for Apple cv. Starking Delicious
2015; Society for Advancement of Science and Rural Development; Volume: 8; Issue: 11 Linguagem: Inglês
ISSN
0974-8431
Autores Tópico(s)Plant Physiology and Cultivation Studies
ResumoDeviation from optimum percentage (DOP) is a diagnosis methodology for leaf analyses which expresses the deviation for each element with respect to its optimal concentration. This deviation is an individual index for each nutrient and allows the sorting of all the analyzed nutrients according to their limitations. A nutritional survey was undertaken for two years in the major apple growing belts viz. Jubbal-Kotkhai, Karsog, Kalpa, Kotgarh and Naggar areas of Himachal Pradesh (India) to establish DOP reference concentrations for the nutritional diagnosis and to compare them with average of published sufficiency ranges (SR). The concentrations of nitrogen, phosphorus, potassium, calcium, magnesium, iron, manganese, copper and zinc were determined in leaf samplesand nutrient concentration in high yielding subpopulation (>150 kg/tree) were selected as DOP norms. Results suggest that DOP and SR approaches were in close agreement in diagnosing N, P, K, Ca, Mg, Cu and Zn deficiencies and excesses and DOP reference values, developed in the present study, can be used as diagnostic tool to predict if insufficiencies or imbalances are occurring in apple production areas in the Western Himalayas and indeed elsewhere with similar c1imatic and soil conditions.
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