Early development of seedlings of copaiba under different shade levels and substrates

Submitted by repositorio ufvjm (repositorio@ufvjm.edu.br) on 2017-01-25T11:28:15Z No. of bitstreams: 2 S1806-66902012000200015.pdf: 235779 bytes, checksum: e5a22ffae8843169d208742f3f9d8198 (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5)Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2017-03-08T18:47:08Z (GMT) No. of bitstreams: 2 license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) S1806-66902012000200015.pdf: 235779 bytes, checksum: e5a22ffae8843169d208742f3f9d8198 (MD5)Made available in DSpace on 2017-03-08T18:47:08Z (GMT). No. of bitstreams: 2 license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) S1806-66902012000200015.pdf: 235779 bytes, checksum: e5a22ffae8843169d208742f3f9d8198 (MD5) Previous issue date: 2012-06-01Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)Empresa de Pesquisa Agropecu?ria de Minas Gerais (EPAMIG)Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)O presente estudo objetivou avaliar a influ?ncia de diferentes n?veis de sombreamento e tipos de substratos no desenvolvimento inicial de mudas de copa?ba. O experimento foi conduzido no delineamento em blocos casualizados no esquema fatorial 5 x 4. Os tratamentos foram compostos pela combina??o de cinco substratos, Bioplant?; 70% vermiculita + 30% casca de arroz carbonizada (70V+30CA); 40% vermiculita + 30% casca de arroz carbonizada + 30% fibra de coco (40V+30CA+30FC); 50% vermiculita + 30% casca de arroz carbonizada + 20% areia (50V+30CA+20A); 70% vermiculita + 15% casca de arroz carbonizada + 15% vermicomposto de res?duo de ind?stria t?xtil (70V+15CA+15VC) e quatro n?veis de sombreamento, (pleno sol (0%), 30; 50 e 70%) e tr?s repeti??es. Foram avaliadas as seguintes vari?veis: taxa de crescimento absoluto em altura e di?metro; sobreviv?ncia; massa seca de folhas, caule e raiz; massa seca total; raz?o entre massa seca da parte a?rea e massa seca de raiz; e a raz?o de massa foliar. Os resultados demonstram que as mudas de copa?ba necessitam de sombra em sua fase inicial de desenvolvimento, sendo o n?vel de 50% de sombreamento uma alternativa vi?vel para produ??o de suas mudas. As mudas de copa?ba crescidas no substrato 70V+30CA apresentaram maior produ??o de massa seca total, enquanto no Bioplant? observou-se caracter?sticas inferiores para a massa seca de folha, massa seca total e raz?o de massa foliar.This study aimed to evaluate the influence of different shade levels and types of substrates in the initial development of seedlings of Copaiba. The trial was conducted in a randomized block design in a factorial 5 x 4 with five substrates, Bioplant?; 70% vermiculite + 30% rice hulls (70V+30CA), 40% vermiculite + 30% rice hulls + 30% coconut fiber (40V+30CA+30FC), 50% vermiculite + 30% rice hulls + 20% sand (50V+30CA+20A), 70% vermiculite + 15% bark carbonized rice + 15% vermicompost residue of textile industry (70V+15CA+15VC); four levels of shading (full sunlight (0%), 30, 50 and 70%) and three replications. We evaluated the following variables: absolute growth rate in height and diameter, survival, dry mass of leaves, stem and root, total dry mass, dry mass ratio of shoot and root dry weight, and leaf weight. The results show that the seedlings need shade Copaiba in its early stage of development, and the level of 50% shading a viable alternative for production of its seedlings. The seedlings grown in Copaiba 70V+30CA produced more total dry mass, while in Bioplant? inferior characteristics observed for dry weight of leaves, total dry weight and leaf weight