Compositional Nutrient Diagnosis (CND) Norms and Indices for Potato (Solanum tuberosum L.)
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Society for Promotion of Horticulture
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A survey was conducted in potato fields for collection of leaf samples to establish nutrientconcentration yield data bank. The data bank was used for developing multivariatecompositional nutrient diagnosis (CND) norms for assessing the nutritional status ofselected centres of potato growing fields. The mean N, P and K concentrations were2.09, 0.25 and 4.16 %, respectively. The mean Ca (1.11%) concentration was twice highercompared to Mg (0.63 %) concentration. The mean values of Zn, Cu, Fe, Mn and B were43.69, 31.24, 986.71, 192.76 and 59.98 ppm, respectively. The CND norms for VN, VP andVK were 3.04, 0. 94 and 3. 73, respectively. The norm for Ca (VCa=2. 45) and Mg(VMg=1.78) were much narrower compared to the absolute nutrient concentration. Thenorm for VZn, VCu, VFe, VMn and VB were -3.24, -3.60, -0.23, -1.98 and -2.89respectively.The multivariate CND norms developed for ten nutrients proved to be an important toolfor diagnosis of nutrient imbalance in potato. The nutrient indices developed indicatedthat Zn was the most common yield-limiting nutrient. The CND norms and the indicesdeveloped can be used for identifying the hidden hunger of various nutrients in potato forevolving nutrient management strategies.
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