Abstract
ABSTRACT 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 modeling 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.
Highlights
Métodos indiretos para determinação do índice de área do cladódio da palma forrageira Métodos de determinação do índice de área foliar têm sido aplicados a várias culturas agrícolas
The indirect methods used to estimate the cladode area index of forage cactus clones were: 1) solar radiation interception with different measurement techniques; 2) planimetry of medium cladodes; 3) leaf discs of medium cladodes; 4) modeling based on the total morphogenesis of the plant, representative branching or medium cladode
These methods were applied to three forage cactus clones: IPA Sertânia (IPA; Nopalea cochenillifera Salm Dyck; spacing: 1.5 m x 0.3 m; age: 5 years and 1 month); Miúda (MIU; Nopalea cochenillifera Salm Dyck; spacing: 1.5 m x 0.5 m; age: 4 years and 8 months); and Orelha de Elefante
Summary
Métodos indiretos para determinação do índice de área do cladódio da palma forrageira Métodos de determinação do índice de área foliar têm sido aplicados a várias culturas agrícolas. A estimativa do índice de área do cladódio da palma forrageira pelo método da modelagem foi considerada a mais precisa, por apresentar valores de coeficiente de precisão e de acurácia acima de 0,90, bem como desempenho de muito bom a ótimo. Methods for determining leaf area index have been applied to various agricultural crops 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. 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. Its applicability depends on the use of estimated parameters or adjusted value equations
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