%0 Journal Article
%T Crescimento e qualidade de mudas de cedro (Cedrela fissilis Vellozo) em viveiro, mediante diferentes t¨¦cnicas de produ  o. Cedro seedlings (Cedrela fissilis Vell.) growth rate and quality, at nursery, under different production systems.
%A Edgar Fernando de LUCA
%A Rodrigo Jos¨¦ REBECCHI
%A Lauri Amandio SCHORN
%J Revista do Instituto Florestal
%D 2010
%I Instituto Florestal
%X O sucesso da silvicultura de esp¨¦cies nativas depende da qualidade das mudas, mas poucos estudos existem sobre t¨¦cnicas adequadas para produ  o de mudas de cada esp¨¦cie. Compararam-se sete t¨¦cnicas de produ  o de mudas de Cedrela fissilis (cedro), compreendendo semeadura direta e repicagem, tr¨ºs tipos de recipientes (saco pl¨¢stico com 1.710 cm3, e tubetes com 32 cm3 e 170 cm3) com a repicagem aos 40, 65 e 90 dias ap¨®s a semeadura. Ao final do ciclo produtivo (180 dias) a repicagem para saco pl¨¢stico n o favoreceu o crescimento em altura a¨¦rea ou diametro do colo, mas proporcionou maior desenvolvimento em fitomassa, principalmente se feita aos 40 dias. Mudas repicadas para tubete sofreram dr¨¢stica redu  o em altura e, em menores propor  es, houve tamb¨¦m redu  o do diametro. Em compara  o ¨¤s mudas repicadas para saco pl¨¢stico, a fitomassa das mudas repicadas para tubete foi menor. Por outro lado, a repicagem para tubete resultou em maior n¨²mero de ra¨ªzes secund¨¢rias e maior robustez, indicando melhor qualidade das mudas de cedro.To succeed, the forestry of native species relies on the seedlings quality. However, there are only few studies dealing with seedlings production systems to every species. This paper describes the study and evaluation of seven Cedro seedlings production systems: direct sowing, nursery lifting (made at 40, 65 and 90 days after sowing) and the use of three types of seedlings containers (1,710 cm3 polyethylene bags, and 32 cm3 and 170 cm3 polypropylene tubes). At the end of the productive cycle (180 days after sowing), the nursery lifting to the polyethylene bags did not improve the seedlings development considering height or root collar diameter growth. However, it improved the phytomass development, highlighting the 40 days after sowing production system. Seedlings transplanted to the polypropylene tubes had drastic reduction considering height rates. They also presented a reduction considering the diameter. Nursery lifting to polypropylene tubes had lower phytomass development in comparison to the seedlings transplanted to polythylene bags. It¡¯s important to realize that the seedlings produced under the nursery lifting system to polypropylene tubes had a larger amount of secondary roots and a higher Strength Index, which can indicate better quality of Cedro seedlings.
%K repicagem
%K sobreviv¨ºncia
%K ¨ªndice de Dickson
%K ¨ªndice de robustez
%K sistema radicial
%K nursery lifting
%K seedlings survival
%K Dickson¡¯s Index
%K Strength Index
%K root system.
%U http://www.iflorestal.sp.gov.br/publicacoes/revista_if/RIF22-2PDF/p_189_199.pdf