Journal of Applied Horticulture. 2004: 6(2): 23-26

Derivation and evaluation of new nutrient norms for twelve nutrients (N, P, K, Ca, Mg, Na, S, B, Zn, Cu, Fe and Mn) in the petioles of Muscat grapes (Vitis vinifera L.) using the CVA, DRIS, MDRIS and CND approaches

Kumar, P S S; Geetha, S A; Savithri, P

Department of Soil Science and Agricultural Chemistry, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore - 641 003, India.

Diagnostic norms were developed from 53.2% top yielding vineyards in Tamil Nadu, India, among 940 observations on yield and petiole analyses of Muscat grapes using bivariate Diagnosis and Recommendation Integrated System (DRIS)/Modified Diagnosis and Recommendation Integrated System (MDRIS) and multivariate Compositional Nutritional Diagnosis (CND). About 66 optimum nutrient ratios and concentrations were computed from N, P, K, Ca, Mg, Na, S, B, Zn, Cu, Fe and Mn analytical results. When several nutrients are limiting yield simultaneously, the diagnosis of nutrient disorder by multivariate CND approach is required for higher diagnostic precision. Based on the classification of NIIs, approximately 17% were severely limited by mineral nutrition and 32% of the vineyards were identified as having possible imbalances. The norm values and identification of yield limiting nutrients were close to each other with DRIS and CND, while there was no consensus with Critical Value Approach norms and diagnosis.