Composição nutricional da jitirana (Merremia aegyptia), flor-de-seda (Calotropis procera) e mata-pasto (Senna uniflora) em diferentes tipos de solos.

Abstract

The jitirana, fleur-de-silk and obtusifolia spontaneous species are present in different edaphic environments in the savanna biome, which leverages the same to be used by farmers who toil in the study area. Therefore, we aimed to evaluate the nutritional composition of jitirana (aegyptia Merremia), silk-flower (Calotropis procera) and obtusifolia (Senna uniflora) in different soil types. Soil and plant samples were collected at four sites of the city of Natal, Rio Grande do Norte, in the months from May to June 2014.'s . Design was a completely randomized factorial 4 x 3 with four replications. Treatments consisted of the evaluation of four types of soils (Alfissol Eutrophic latossolic; Vertisol; Rhodic Dystrophic Yellow texture sandy Cambisol) three spontaneous species (jitirana;-flowered silk and obtusifolia). The characteristics evaluated for soil types were: N; MO; pH; P; K *; Na *; Ca” and Mg”. Already, spontaneous species evaluated: N; P; K *; Ca”'; Mg?” and carbon / nitrogen (C / N) grating. Interaction of soil types and spontaneous species for phosphorus, calcium and magnesium was observed. The levels of nitrogen and potassium of spontaneous species were statistically different, with the jitirana that showed the highest mean values: N (23.8 g kg") and K + (17.2 g kg; -flowered silk with mean values: N (20.9 g kg) and K? (15.2 g kg!) and obtusifolia with mean values: N (21.3 g kg!) + and K (10.4 g kg. Soil types influenced the nutrient concentration of the species.