Sintomas de deficiências nutricionais e matéria seca em plantas de Nim, cultivadas em solução nutritiva

Abstract

The planting of forest species is an activity that, besides introducing new exotic types of plants, can lessen the environmental impacts resulting from extractivism. Nevertheless, such success depends, upon other factors, on the knowledge of the nutritional needs of the species to be used. This study intended to check the typical symptoms of nutritional defi ciency of macronutrients in the culture of Neem, through the visual observation of the plants. The experiment was carried out in a greenhouse at the College of Agronomy and Veterinary Medicine (FAMEV) of the Federal University of Mato Grosso (UFMT) in Cuiabá/MT, and it was set up in randomized blocks, with seven treatments and three repetitions. Each experimental unit was represented by a plastic vase, two liters capacity. The treatments used were: complete nutritive solution and solution with the omission of the following nutrients: -N, -P, -K, -Ca, -Mg and -S. It was ascertained that the visual symptoms of nutrient defi ciency were, as a general rule, of easy characterization except for the treatment with omission of sulphur. Therefore, the omission of macronutrients decreases the production of total dry matter of the Neem plants, except for the omission of the S nutrient.