Efeito do desbaste e da fertilização na porcentagem de casca e conicidade de toras de eucalyptus grandis

Abstract

Genus Eucalyptus species used as sawn wood is already reality, although it is still necessary more research on silvicultural techniques that may influence sawn wood usage. This research aim to analyze influence of thinning and fertilization on percentage of bark and log taper of a planted population of Eucalyptus grandis W. Hill ex Maiden, 21 years-old, in Lençóis Paulista, SP. It focused three thinning intensities (37, 50 and 75%), presence or absence of fertilizers and two DBH classes (class 1 for values between 25 and 30 and class 2 for values between 30 and 35 cm). Samples of 3 m. long logs had been collected from two vertical positions at the height of tree commercial stem (log 1 from 1.7 to 4.7 and log 2 from 6.4 to 9.4 m), and treated independently. Bark percentage was influenced by thinning intensity and fertilization, but only in log 1. The percentage of bark was influenced by thinning intensity and fertilization but only in log 1. Diameter class did not bring any effect on such tree characteristic. Log tapering varied only accordingly to the diameter class, and it was larger for 2nd class logs.