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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Indirect methods for determining the area index of forage cactus cladodes.
Autores:  PINHEIRO, K. M.
SILVA, T. G. F. da
DINIZ, W. J. da S.
CARVALHO, H. F. de S.
MOURA, M. S. B. de
Data:  2015-05-07
Ano:  2015
Palavras-chave:  Indice de área cladódio
Nopalea
Opuntia
Analisador de dossel
Método destrutivo
Palma forrageira
Canopy analyzer
Destructive method
Resumo:  Methods for determining leaf area index have been applied to various agricultural crops. However, their uses are limited to broadleaf plants, with no record for forage cactus, whose radiation interception is performed by the cladode. This study aimed to evaluate the use of different indirect methods to estimate the area index of forage cactus cladode. Cladodes from clones of Nopalea cochenillifera Salm Dyck, Nopalea cochenillifera Salm Dyck and Opuntia stricta (Haw) Haw were used, being sampled sixty plants per clone, distributed in five sub-areas with 12 plants. Light interception methods with different measurement techniques were evaluated, as well as the planimetric, leaf discs and odeling methods. The estimate of area index of the forage cactus cladode by the modeling method was considered the most accurate one, for presenting precision coefficient values and accuracy above 0.90, as well as a performance varying from very good to excellent. However, its applicability depends on the use of estimated parameters or adjusted value equations. The methods of light interception and its derivations, leaf discs of medium cladodes and planimetry of medium cladodes are not recommended, due to their low precision and accuracy.

2015
Tipo:  Artigo em periódico indexado (ALICE)
Idioma:  Inglês
Identificador:  54630

http://www.alice.cnptia.embrapa.br/handle/doc/1014966

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/123372/1/Magna-2015.pdf

10.1590/1983-40632015v4530617
Editor:  Pesquisa Agropecuária Tropical, Goiânia, v. 45, n. 2, p. 163-171, abr./jun. 2015.
Relação:  Embrapa Semiárido - Artigo em periódico indexado (ALICE)
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