Acúmulo e partição de nutrientes de cultivares de milho em competição com plantas daninhas

Autor: Enilson de Barros Silva, Felipe Paolinelli de Carvalho, D Valadão Silva, J.P. Cury, José Barbosa dos Santos, E.C.M. Byrro, R.R. Braga
Přispěvatelé: Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Universidade Federal de Vi?osa (UFV) DFT Programa de P?s-Gradua??o em Fitotecnia
Rok vydání: 2012
Předmět:
Zdroj: SciELO
Repositório Institucional da UFVJM
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
instacron:UFVJM
ISSN: 0100-8358
DOI: 10.1590/s0100-83582012000200007
Popis: Submitted by repositorio ufvjm (repositorio@ufvjm.edu.br) on 2017-01-06T15:09:26Z No. of bitstreams: 2 S0100-83582012000200007.pdf: 255400 bytes, checksum: 4377254bf36aa9d9ae28461b158eb5ec (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2017-01-06T16:52:12Z (GMT) No. of bitstreams: 1 S0100-83582012000200007.pdf: 255400 bytes, checksum: 4377254bf36aa9d9ae28461b158eb5ec (MD5) Made available in DSpace on 2017-01-06T16:52:12Z (GMT). No. of bitstreams: 1 S0100-83582012000200007.pdf: 255400 bytes, checksum: 4377254bf36aa9d9ae28461b158eb5ec (MD5) Previous issue date: 2012-06-01 Funda??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) A competi??o por nutrientes varia com as esp?cies envolvidas e pode determinar o sucesso de plantas cultivadas em detrimento das esp?cies daninhas. Objetivou-se com este trabalho avaliar os efeitos da competi??o entre tr?s cultivares de milho (h?brido DKB 390 YG, variedade AL 25 e h?brido SHS 4080) e seis esp?cies de plantas daninhas (Bidenspilosa, Cenchrus echinatus, Brachiaria brizantha, Commelina benghalensis, Brachiaria plantaginea e Euphorbia heterophylla) no ac?mulo e na aloca??o de nutrientes pelas plantas, determinando-se tamb?m o potencial dessas esp?cies em ciclar nutrientes. O experimento foi realizado em condi??es controladas de temperatura e umidade, em delineamento de blocos casualizados, com quatro repeti??es. O per?odo de conviv?ncia entre os cultivares de milho e as plantas daninhas foi de 60 dias ap?s emerg?ncia do milho. Os cultivares de milho apresentaram reduzida capacidade de acumular nutrientes quando em competi??o. O conte?do relativo das esp?cies infestantes foi severamente reduzido em fun??o dessa conviv?ncia. A capacidade de acumular nutrientes aparentemente n?o representa vantagem competitiva para as esp?cies infestantes. O cultivar AL 25 foi o que menos tolerou a competi??o, e B. brizantha e C. benghalensis foram as esp?cies com maior capacidade competitiva. B. brizantha e C. echinatus, livre da conviv?ncia com o milho, apresentaram elevado potencial em ciclar nutrientes. Competition for nutrients varies with the species involved and can determine the success of plants grown at the expense of weeds. The objective of this study was to evaluate the effects of competition among three cultivars of maize (hybrid DKB 390 YG, variety AL 25, and hybrid SHS 4080) and six weed species (Bidens pilosa, Cenchrus echinatus, Brachiaria brizantha, Commelina benghalensis, Brachiaria plantaginea and Euphorbia heterophylla) on the accumulation and allocation of nutrients by plants, also determining the potential of these species in nutrient cycling. The experiment was conducted under controlled temperature and humidity, in a randomized block design with four replications. The period of coexistence between corn and weeds was 60 days after corn emergence. The maize cultivars showed reduced ability to accumulate nutrients when in competition. The relative content of weed species was severely reduced as a result ofthis coexistence. The ability to accumulate nutrients apparently does not represent a competitive advantage forthe infesting species. Cultivar AL 25 was the species that tolerated the competition the least and B. brizantha and C. benghalensis showed greater competitive ability. B. brizantha and C. echinatus, free from coexistence with the corn, had high potential for nutrient cycling.
Databáze: OpenAIRE
Externí odkaz: