Absorção, translocação e utilização de macronutrientes, cloro e sódio, em mudas de pupunheira submetidas à salinidade.

Abstract

Soil salinity causes crop growth reduction due to nutritional disorders that affect uptake, transport and distribution of the nutrients by plants. With the objective to determine the influence of different salinity levels upon mineral nutrition of peach palm seedlings, an experiment was established in nutritive solution, under greenhouse conditions at the Soil Science Department — Federal University of Lavras, Minas Gerais studs. A randomized block experimental design with seven treatments and four replicates was used. The treatments were 0.5 mmol L-1 Cl; 1.0 Na and 0.5 mmol L-1 Cl (control); 5.0; 15.0; 30.0; 60.0 and 120.0 mmol L" of NaCl. Response to salinity was evaluated through accumulation, translocation and utilization efficiency of macronutrients, Na and Cl. Sodium and chlorine accumulation increased and the uptake of the macronutrients decreased as a function of salinity levels. The macronutrients, Na and C! translocation efficiency decreased and the utilization efficiency increased for the elements studied due to saline stress.