Knowledge of the nutritional status of vegetal species can anticipate the time at which seedlings are formed, which increases survival rate in the field after planting. The objective of this study was to evaluate the growth and nutrient content of mahogany seedlings according to increasing doses of Ca in the nutrient solution at a pressure ranging from 0.5 to 1.5 atm and a pH of 6. Seedlings of mahogany plants at 45 days of age and with four well-defined leaves were selected for the experiment. The experimental design was completely randomized, with five treatments (0, 80, 160, 240 and 320 mg L −1 of Ca) and five replications. At 71 days after treatment application, some variables were assessed: plant height, stalk diameter, root length, shoot dry matter (SHDM), root dry matter (RDM), SHDM/RDM ratio and Ca content in shoots and roots. The dose of maximum economic efficiency was 119 mg L −1 , which corresponded to production of 27.79 g of total dry matter (TDM). The critical level of Ca for SHDM was 17.10 g kg −1. For the dose of 320 mg L −1 of Ca, a reduction in stalk diameter, root length, SHDM and RDM was observed when compared to the 240 mg L −1 dose. The greatest relative increment in mahogany plant growth was observed at the dose of 240 mg L −1 of Ca.
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