“…Guajuvira is indicated for civil construction, due to its characteristics of the wood, as well as for the recovery of degraded areas, since it presents good adaptability to shallow soils and low fertility. In the last decades the production of seedlings has been carried out in a protected environment, this physical environment many changes in the meteorological elements (Trautenmüller et al, 2016) and solar radiation is one of the most modified elements (Behling et al, 2015;Dalmolin et al, 2015;Schwerz et al, 2017), being considered a primordial element so that the seedlings develop of robust form. Plant growth is a ratio of biomass balance accumulated by photosynthesis, crop yield depends on the rates of photosynthesis in any growing environment (ORT & LONG, 2003;PTASINSKI, 2016;TAIZ et al, 2017).…”