Use of multi-dimensional scaling for analysis of teak plants (Tectona grandis) under omission of macronutrients

摘要

The aim of this study was to diagnose the deficiency symptoms and evaluate the production of dry matter, contents and accumulation of macronutrients in teak plants (Tectona grandis) grown on substrates with omission of nutrients using the multidimensional scaling analysis. The experimental design was completely randomized blocks with seven treatments with four replications as follows: treatment complete (C), and the individual omissions such as: zero levels of -N (omission of nitrogen), -P (omission of phosphorus), - K (omission of potassium), -Ca (omission of calcium), -Mg (omission of magnesium), -S (omission of sulfur). The statistical analysis model was Multivariate Multidimensional Scaling (MDS) using the statistical Software SPSS 17.0, which summarizes information and points the mechanisms of extreme use fullness. The results showed that omissions of macronutrients cause nutritional deficiency and visual symptoms known to other species as usual. The deficiencies restricted the dry matter production according to the following order: K > N > Mg > Ca > P > S. The leaf content of macronutrients in teak plants subjected to omission of nutrients compared to treatment resulted in complete change in the values as: N = 14.5-20.7 g kg-1, P = 1.0-2.1 g kg-1, K = 3.0-7.1 g kg-1, Ca = 3.9-10.5 g kg-1, Mg = 0.8-4.9 g kg-1, and S = 1.5-2.1 g kg-1. The multi-dimensional scaling analysis demonstrated that calcium, phosphorus and magnesium were limiting factors in the production of dry matter and in macronutrient contents, while nitrogen was accumulated mainly in leaves. Phosphorus and magnesium were accumulated in smaller amounts.