NDLI: Disponibilidade de macronutrientes em cultivares de cana-de-açúcar submetidas à competição com Brachiaria brizantha

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Disponibilidade de macronutrientes em cultivares de cana-de-açúcar submetidas à competição com Brachiaria brizantha

Content Provider	Semantic Scholar
Author	Galon, Leandro Tironi, Siumar Pedro Silva, Aline Fernanda Furtado Beutler, Amauri Nelson Rocha, Paulo Roberto Ribeiro Ferreira, Evander Alves Silva, Antônio Alberto Da
Copyright Year	2012
Abstract	Objetivou-se com o trabalho verificar os teores foliares dos macronutrientes e o desenvolvimento das cultivares de cana-acucar 'RB72454', 'RB867515' e 'SP801816' em competicao com populacoes de Brachiaria brizantha. Os tratamentos utilizados foram: 1) cultivar de cana-de-acucar 'RB72454' e populacao de B. brizantha de 0, 1, 3, 7, 15, 32, 40, 32, 64, 92, 88 e 112; 2) 'RB867515' e 0, 1, 4, 14, 10, 18, 28, 30, 36, 54, 52 e 72; 3) 'SP801816' e 0, 1, 3, 6, 14, 20, 24, 26, 26, 32, 46 e 56 plantas m-2. Aos 120 dias apos a emergencia da cultura, foi quantificada a massa seca (MS) da parte aerea da cana-de-acucar e da B. brizantha. Aos 290 dias apos a emergencia (DAE), foram coletadas amostras das folhas +3 (terceira folha a partir do apice das plantas), nas quais foram avaliadas as concentracoes de nitrogenio total, fosforo, potassio, magnesio e calcio. Com o aumento da populacao de B. brizantha, observou-se reducao da MS somente na cultivar 'RB72454'. O aumento na populacao de B. brizantha reduziu a concentracao de fosforo em todas as cultivares, nitrogenio em 'RB72454' e 'SP801816', potassio e magnesio para 'RB72454'. Nas populacoes mais elevadas de B. brizantha, houve maior competicao pelos nutrientes disponiveis no meio, sendo o fosforo o mais limitante. A cultivar 'RB72454' foi a menos competitiva pelos nutrientes no solo. As cultivares apresentaram reducao media de 76% na produtividade de colmos na densidade maxima de B. brizantha.
Starting Page	1372
Ending Page	1379
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1590/S0103-84782012000800007
Volume Number	42
Alternate Webpage(s)	http://www.scielo.br/pdf/cr/v42n8/a23012cr5773.pdf
Alternate Webpage(s)	https://doi.org/10.1590/S0103-84782012000800007
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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