Avaliação silvicultural e produtiva da Jatropha curcas (Linnaeus) no município de Cássia, MG

• Autor(a) principal: Pires, Thiago Pinto
• Data de Publicação: 2010
• Outros Autores: Silva, Magali Ribeiro da [UNESP], Netto, Sylvio Péllico
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www2.pucpr.br/reol/pb/index.php/academica?dd1=4283&dd99=view&dd98=pb; http://hdl.handle.net/11449/140391
• topic: Pinhão-manso; Biodiesel; Germination; Substrate; Pinhão-manso; Biodiesel; Germinação; Substrato

The species Jatropha curcas (Linnaeus) belongs to the family Euphorbiaceae, popularly known as pinhão-manso, with many attributes, multiple uses and considerable potential for biodiesel production. This work was conducted with the pinhão-manso, in the Reata Farm, MG, in four experiments to evaluate the time of collecting seeds, its germination, the growth of seedlings in nursery, and tree structure in adulthood. Statistical analysis was conducted with experimental implementation of ANOVA and Tukey test to detect differences between means. It was concluded that the seeds attacked by bedbug Pachycoris torridus, taken in March and April, germination percentages were much lower than those that had not been attacked by this insect, harvested in January. The treatment that had reached the best result (PG = 60% and VfG = 2.64 s/day) was the T1S3, whose seeds were collected in January and with substrate land + 20% + NPK dung; and the treatment that hit the lower germination percentage was T3S2 (PG = 21.25%), whose seeds were collected in April and substrate land + 25% M.O. Seeds harvested in March, regardless of substrate used, were those that reached the lowest rate of fi nal germination speed. The tests showed the need for a pest control for conducting sprocket nut plantations with purposes of seed production in areas where there is the presence of P. torridus. The best substrate for development from was the 3 (composed of ground beef manure + 20% + NPK - 0.3 kg m- ³ super simple, 0.05% potassium chloride). The experiment showed that the seeds collected in March and April after the attack of the bedbug P. torridus, besides their germination percentages were much lower than those which had not undergone the attack, also gave rise to individuals with lower growth rates. The plant of pinhão-manso in its broadleaf period did not have signifi cant differences in latex exudation throughout the day as there was no correlation between height and the number of branches; this means that the amount of branches that an individual has is one factor that can be genetically selected, in order to increase future production of seed per individual.