Abstract

Arid and semiarid regions cover approximately 30 % of the Earth's surface, yet have great importance in biological diversity. An example of this is the native and endemic flora found in northern Chile, where we find a large number of species present serious conservation problems. In this context, the low existing knowledge in these species is transformed into a difficulty in deciding conservation, largely because of lack of knowledge in the propagation process. Therefore, we studied the effect of nitrogen nutrition on growth B. brevifolium, O. gigantea and B. peduncularis plant. We used seeds collected from different altitudinal levels (m), seedlings were subjected to different levels of nitrogen (0, 100, 300 and 500 mg L -1). With the aim of determining the effect of nitrogen fertilization in plant growth. To meet the objective set, recorded the height, diameter and root biomass and every 30 ± 1 days. As the nitrogen concentration increases in the growth medium, increase the plant growth B.peduncularis and O. gigantea (P < 0.001), with no effect of nitrogen on locust bean plants (P > 0.05).