Avaliação da desordem nutricional de plantas de amendoim cultivadas em solução nutritiva suprimidas de macronutrientes

Abstract

The experiment was carried out under greenhouse conditions to evaluate the effects of macronutrient omission, nutritional status, and development on peanut (Arachis hypogaea L.), as well to describe nutritional deficiency symptoms. The experiment was arranged in a completely randomized design with three replications and seven treatments, corresponding to a complete nutritive solution and individual omission of N, P, K, Ca, Mg, and S. The peanut plants cultivar Runner IAC 886 were grown in a Hoagland & Arnon nutrient solution in 5dm ³ pots. Plant height, stem diameter, leaves number, SPAD index, dry mass of aerial part, root, and hole plant, as well the nutritional disorder description were evaluated. The omission of K, Ca, N, P and Mg showed the higher growth limiter to the peanut growth, reducing considerably the plant height, stem diameter, number of leaves and also reducing the peanut dry mass production. Nutritional deficiency symptoms of each nutrient were observed. Macronutrient levels observed in peanut plants were, respectively to the control and to the treatment with nutrient omission were: N = 19.0 - 12.2, P = 4.07 - 1.1, K = 27.9 - 4.7, Ca = 10.4 - 1.6, Mg = 6.2 - 0.96, S = 1.2 - 0.7 g kg^-1.