Amostragem foliar da bananeira 'Prata-Anã
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Data
2010-03-01
Autores
Rodrigues, Maria Geralda Vilela
Pacheco, Dilermando Dourado
Natale, William [UNESP]
Silva, José Tadeu Alves da
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Fruticultura
Resumo
Para diagnose nutricional da bananeira, é necessário padronizar a amostragem do tecido a ser utilizado, já que a composição mineral varia com a idade da planta, com a folha amostrada, entre as diversas partes da folha, ao que se somam as condições ecológicas, diferenças varietais e flutuações sazonais dos elementos. Portanto, a possibilidade de equívoco na interpretação é considerável. O Método de Amostragem Internacional de Referência (MEIR) para bananeira recomenda coletar a terceira folha de plantas com cachos que apresentem todas as pencas visíveis e não mais que três mãos de flores masculinas abertas, retirando-se a metade interna de uma faixa central do limbo, desprovida da nervura central. Há uma dificuldade em seguir tal recomendação para bananeira 'Prata-Anã' cultivada no norte de Minas Gerais, pois ela possui porte alto e roseta foliar muito densa, que confunde a localização da folha amostrada. Além disso, normalmente, as amostras são retiradas com largura diferente dos 10 cm recomendados. Dadas as dificuldades de amostragem da bananeira 'Prata-Anã' e o fato de besta cultivar sob irrigação ser pouco estudada, comparada àquelas do subgrupo Cavendish, o presente trabalho objetivou determinar o efeito da folha amostrada e da largura da amostra sobre os teores minerais de bananeira 'Prata-Anã' cultivada sob irrigação no norte de Minas Gerais. Apesar das variações estatísticas, os teores foliares mantiveram-se dentro da faixa de suficiência, independentemente da posição da folha amostra da- 2ª, 3ª ou 4ª folha - ou do tamanho da amostra - 10; 20 ou 30 cm de largura. Isto sugere que a coleta de folha na posição acima (segunda) ou abaixo (quarta) da folha recomendada terceira, numa largura foliar de 10 a 30 cm, pouco altera os teores foliares em relação à indicação pelo método MEIR, tolerando-se assim uma possível variação da amostra quanto à posição e à largura foliar testadas.
For nutritional diagnosis of the banana it is necessary to standardize the tissue sampling to be used, since the mineral composition changes with the plant age, sampled leaf, among the several parts of the leaf, besides ecological conditions, variety differences and seasonal fluctuations of the elements. Therefore, the possibility of mistake in the interpretation is considerable. The Method of International Sampling of Reference (MEIR) for banana recommends to collect the third leaf of plants with bunches that present all of the visible hands and no more than three hands of open masculine flowers, leaving the internal half of a central grade of the limbus, without the central rib. There is some difficulty in following such recommendation for banana tree 'Prata-Anã' cultivated in the North of Minas Gerais, because it possesses high load and very dense foliar rosette that confuses the location of the sampled leaf. Moreover, usually the samples are removed with width different from the recommended 10 cm. Due to the sampling difficulties of the 'Prata-Anã' banana and the fact that this cultivar, under irrigation, to be little studied when compared to those of the subgroup Cavendish, the present work aimed to determine the effect of the sampled leaf and the sample width on the mineral contents of the 'Prata-Anã' banana tree cultivated under irrigation in the North of Minas Gerais. In spite of the statistical variations, the foliar contents maintained themselves inside of the sufficiency grade, regardless of the sampled leaf position - 2nd, 3rd or 4th leaf - or of the sample size - 10, 20 or 30 cm of width. This suggests that the leaf collection in the position above (second) or below (fourth) of the third recommended leaf, in a foliar width from 10 to 30 cm, does not alter a lot the foliar contents in relation to the indication by the MEIR, thus being tolerated as a possible sample variation for the tested position and foliar width.
For nutritional diagnosis of the banana it is necessary to standardize the tissue sampling to be used, since the mineral composition changes with the plant age, sampled leaf, among the several parts of the leaf, besides ecological conditions, variety differences and seasonal fluctuations of the elements. Therefore, the possibility of mistake in the interpretation is considerable. The Method of International Sampling of Reference (MEIR) for banana recommends to collect the third leaf of plants with bunches that present all of the visible hands and no more than three hands of open masculine flowers, leaving the internal half of a central grade of the limbus, without the central rib. There is some difficulty in following such recommendation for banana tree 'Prata-Anã' cultivated in the North of Minas Gerais, because it possesses high load and very dense foliar rosette that confuses the location of the sampled leaf. Moreover, usually the samples are removed with width different from the recommended 10 cm. Due to the sampling difficulties of the 'Prata-Anã' banana and the fact that this cultivar, under irrigation, to be little studied when compared to those of the subgroup Cavendish, the present work aimed to determine the effect of the sampled leaf and the sample width on the mineral contents of the 'Prata-Anã' banana tree cultivated under irrigation in the North of Minas Gerais. In spite of the statistical variations, the foliar contents maintained themselves inside of the sufficiency grade, regardless of the sampled leaf position - 2nd, 3rd or 4th leaf - or of the sample size - 10, 20 or 30 cm of width. This suggests that the leaf collection in the position above (second) or below (fourth) of the third recommended leaf, in a foliar width from 10 to 30 cm, does not alter a lot the foliar contents in relation to the indication by the MEIR, thus being tolerated as a possible sample variation for the tested position and foliar width.
Descrição
Palavras-chave
Nutritional diagnosis, Foliar analysis, diagnostic-leaf, Diagnose nutricional, Analise foliar, folha-diagnóstico
Como citar
Revista Brasileira de Fruticultura. Sociedade Brasileira de Fruticultura, v. 32, n. 1, p. 321-325, 2010.