Produção de mudas de Peltophorum dubium (Spreng.) Taub. (Canafístula) e Senna macranthera (DC. ex Collad.) H. S. Irwin&Barnaby (Fedegoso) em resposta a macronutrientes

• Autor(a) principal: Cruz, Cezar Augusto Fonseca e
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3223
• topic: Nutrição florestal; Propagação de plantas; Espécies florestais nativas; Peltophorum dubium; Senna macranthera; Forest nutrition; Plant propagation; Native forest species; Peltophorum dubium; Senna macranthera; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::SILVICULTURA

Peltophorum dubium (Canafístula) is a Fabaceae-Caesalpinioideae, with fast growth and rusticity. Just as Senna macranthera (Fedegoso), which have large natural occurrence, both species has great potential for use in the recovery of degraded areas. Due to the great need of information about the nutrition of the forest species, the effect of doses of N, P, K, Ca, Mg and S on the growth, biomass production, and on the indexes of quality of seedlings H/D, H/MSPA, MSPA/MSR and IQD of this two species was evaluated. In the work made in a vegetation house, was used samples of a dystrophic red-yellow latosol; an allic red-yellow latosol and a red-yellow paleudalfsoil, retreats of the layer below 20 cm, air dry, drizzled and chemically characterized. The work was delimited through a baconiana matrix, being evaluated three doses of the six macronutrientes and two additional treatments, one with reference doses and other without addition of nutrients. Completely randomized design was adopted with 4 repetitions, in a total of 240 sample units to each one of the studied species. The plants were picked and was verified through analysis of the ortogonais contrasts a significant answer of all the variables studied to the application of the macronutrientes, except for the relationship H/D in the red-yellow latossolo álico and for the treatments P, Ca and S in the red-yellow argissolo. It was not possible to determine for all the different analyzed variables, the critical dose (DC) of the nutrients, being still verified the need of larger differentiation among the doses tested to obtain larger efficiency in the determination of DC. Being used a witness by tested nutrient can still be had a better vision of what happens with the Peltophorum dubium and Senna macranthera plants in response to the addition of the same ones. Interestingly even in the case of Senna macranthera, increasing the experimental trial, due to slower growth recorded in the species, compared to the others already studied.