Growth and nutrition of young coffee plants treated with reduced rates of glyphosate

Autor: Barbosa, Edimilson Alves
Přispěvatelé: Ferreira, Evander Alves, Ronchi, Cl?udio Pagotto, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Fran?a, Andr? Cabral
Jazyk: portugalština
Rok vydání: 2013
Předmět:
Zdroj: Repositório Institucional da UFVJM
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
instacron:UFVJM
Popis: Conte?do parcial Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:13:18Z No. of bitstreams: 2 edimilson_alves_barbosa.pdf: 170936 bytes, checksum: 06292818e7702f0384d1eba33a864347 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:14:28Z (GMT) No. of bitstreams: 2 edimilson_alves_barbosa.pdf: 170936 bytes, checksum: 06292818e7702f0384d1eba33a864347 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:14:54Z (GMT) No. of bitstreams: 2 edimilson_alves_barbosa.pdf: 170936 bytes, checksum: 06292818e7702f0384d1eba33a864347 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Made available in DSpace on 2014-12-22T13:14:54Z (GMT). No. of bitstreams: 2 edimilson_alves_barbosa.pdf: 170936 bytes, checksum: 06292818e7702f0384d1eba33a864347 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2013 Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) Objetivou-se com esse trabalho avaliar o os efeitos das vias de absor??o de subdoses de glyphosate no crescimento e na nutri??o de plantas jovens de caf?. Para isso,plantas de caf? foram cultivadas em solu??o hidrop?nica durante 50 dias ap?s a aplica??o (DAA) do herbicida. O trabalho foi conduzido no delineamento em blocos casualizados (DBC), com esquema fatorial 2x4 sendo o primeiro fator referente ? via de absor??o foliar e radicular e o segundo ? avalia??odo efeito das doses de glyphosate utilizadas: 0; 115,2; 230,4; e 460,8 g ha-1 correspondentes a 0; 8; 16 e 32 % da dose de 1440 g ha-1 da formula??o sal de isopropilamina, com 7 repeti??es. Os sintomas de intoxica??o foram caracterizados por clorose e estreitamento do limbo foliar e atingiram 50e 70% para a absor??o radicular e foliar, respectivamente. Com o aumento das doses do herbicida at? 460,8 g ha-1 ocorreram redu??es do comprimento do caule, do n?mero de folhas, da ?rea foliar, da raz?o de massa foliar, da rela??o parte a?rea raiz, do comprimento das ra?zes e das massas seca das folhas, do caule, das ra?zes e total. O n?mero de folhas; ?rea foliar; massa seca da raiz, caule, folha e total e a raz?o de massa foliar foram menores quando o herbicida foi absorvido pelas folhas. As vias de absor??o e as subdoses de glyphosate n?o alteraram o comportamento do K na planta, mas prejudicaram o desempenho do N, P, Ca e Mg, sendo todos os efeitos mais acentuados quando o herbicida foi absorvido pela parte a?rea em rela??o ? absor??o radicular.Conclui-se que as vias de absor??o e as subdoses de glyphosate n?o interferem no desempenho do K em plantas jovens de caf? em condi??es hidrop?nicas, mas comprometem o comportamento do N, P, Ca e Mg, reduzindo o crescimento dessas plantas. A absor??o e ou transloca??o do glyphosate ? mais eficiente quando absorvido via foliar. Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013. ABSTRACT The objective of this work was to evaluate the effects of absorption pathways of reduced rates of glyphosate on growth and nutrition of young coffee plants. For this, coffee plants were grown in hydroponic solution for 50 days after application (DAA) of the herbicide. The study was conducted in a randomized block design (RBD) with a 2x4 factorial design with the first factor related to the route of foliar and root absorption and the second to Assessmentmethodology effect of glyphosate doses used: 0, 115.2, 230.4; and 460.8 g ha-1 corresponding to 0, 8, 16 and 32% of the dose of 1440 g ha-1 isopropylamine salt formulation with 7 replicates. Symptoms of poisoning were characterized by chlorosis and narrowing of the leaf blade 50 and reached 70% for foliar and root uptake, respectively. With increasing rates of the herbicide to 460.8 g ha-1 occurred reductions in stem length, leaf number, leaf area, the leaf mass ratio, the root shoot ratio, the length of roots and masses dried leaves, stem, roots and all. The number of leaves, leaf area, dry weight of root, stem, leaf, every and leaf weight ratio were lower when the herbicide was absorbed by the leaves. Absorption pathways and reduced rates of glyphosate did not alter the behavior of K in the plant, but impaired performance of N, P, Ca and Mg, with all the effects more pronounced when the herbicide was absorbed by the air in relation to root uptake. Conclude that the process of absorption and reduced rates of glyphosate not interfere with the performance of the K young coffee in hydroponic conditions, but compromise the behavior of N, P, Ca, Mg, reducing the growth of these plants. The uptake or translocation of glyphosate and is most effective when absorbed through the leaves.
Databáze: OpenAIRE
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