produção de biomassa e rizomas e incidência de "metsubure" em taro submetido a doses de potássio com e sem adição de cálcio biomass accumulation, yield and "metsubure" incidence in taro corms submitted to potassium rates, with and without calcium application

Clicks: 308
ID: 166531
2006
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Abstract
Avaliou-se o efeito de doses crescentes de potássio (K), em solo com e sem aplicação de cálcio (Ca), na produção de biomassa, produção de rizomas, teores de K e Ca e incidência de "Metsubure" em rizomas de taro. O experimento foi conduzido em vasos contendo 10 L de solo, em casa de vegetação, de 19/10/2002 a 20/07/2003, com o taro 'Chinês' (BGH 5928). Foram avaliadas cinco doses de K (0; 150; 300; 600 e 1.200 mg K2O kg-1 de solo), sem e com adição de Ca (0 e 232 mg Ca kg-1 de solo), dispostas no delineamento inteiramente casualizado, em esquema fatorial 5 x 2, com quatro repetições. Produções de biomassa e de rizomas apresentaram comportamento semelhante em resposta às doses de K, em presença e ausência da adição do Ca. Valores máximos de biomassa seca e produção de rizomas foram verificados com a adição de Ca nas doses de 794 e 760 mg K2O kg-1 de solo, respectivamente. Sob baixa dose de K, as massas secas de rizomas e totais, a produção de massa fresca e o número de rizomas-filho por planta foram maiores na ausência do que presença de Ca, sendo esse comportamento invertido a partir das doses de K2O de 85; 46; 202 e 578 mg kg-1 de solo, respectivamente. Na ausência da adição de Ca incrementos na dose de K promoveram redução da concentração de Ca nos rizomas-filho; a concentração de K nesses rizomas aumentou com o incremento na dose de K, independentemente da adição de Ca. Na ausência de adição de Ca e nas doses de 600 e 1.200 mg K2O kg-1 de solo constatou-se a incidência do sintoma de "Metsubure" em 6,56 e 9,84% dos rizomas-filho, respectivamente.
The biomass accumulation (cormels and total plant dry weight), yield (fresh weight and number of cormels) and "Metsubure" incidence in taro cormels was evaluated on plants submitted to distinct potassium (K) fertilizer rates, with and without calcium (Ca) application. The experiment was conduced in a glasshouse from 10/19/2002 to 07/20/2003, with the taro 'Chinês' (BGH 5928). Five K levels (0; 150; 300; 600 and 1,200 mg K2O kg-1 of soil), and absence or presence of Ca (0 and 232 mg Ca dm-3 of soil), were evaluated in a 5 x 2 factorial scheme, disposed in completely randomized design, with four replicates. The biomass accumulation and taro yield presented the same behavior in response to K rates, with and without Ca application. Biomass accumulation and yield maximum values were obtained at K2O rates of 794 and 760 mg kg-1 with Ca addition, respectively. Under low K supply, corms dry weight, total plant dry weight, cormels fresh weight and cormels number were higher in the absence of Ca application; this trend was inverted when K2O rate reached 85; 46; 202, and 578 mg kg-1 of soil, respectively. Without Ca application, increased K rates led to increasing in cormels Ca contents; on the other hand, independently of Ca application, cormels K contents increased with the increasing in the K rates. Only without Ca application and K2O rates of 600 and 1,200 mg kg-1 of soil were observed 6.56 and 9.84% of "Metsubure" incidence in taro cormels, respectively.
Reference Key
pereira2006horticulturaproduo Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Francisco HF Pereira;Mário Puiatti;Paulo CR Fontes;Leonardo A Aquino
Journal research on biomedical engineering
Year 2006
DOI
10.1590/S0102-05362006000100004
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362006000100004
Keywords
colocasia esculenta mineral nutrition

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