Alocação de biomassa e nutrientes em Myriophyllum aquaticum sob diferentes níveis de macronutrientes
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Data
2005-06-01
Autores
Domingos, V.D. [UNESP]
Paschoa, P.L. [UNESP]
Martins, D.
Costa, N.V. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira da Ciência das Plantas Daninhas
Resumo
O objetivo deste trabalho foi verificar o efeito de diferentes concentrações de macronutrientes no crescimento e na alocação de biomassa seca em folha, caule e raiz de Myriophyllulm aquaticum. As plantas foram cultivadas em vasos plásticos preenchidos com areia lavada e emersas em solução nutritiva. O experimento foi conduzido em um delineamento inteiramente ao acaso, com quatro níveis (0, 25, 50 e 75%) da concentração original de N, P, K Ca, Mg e S da solução nutritiva, além de uma testemunha (100% da solução nutritiva), com quatro repetições e por um período de 38 dias. A maior produção de biomassa total foi obtida na testemunha. A ausência de K afetou a alocação de biomassa em raízes. Quanto ao comprimento total dos ramos, a maior resposta ocorreu entre os níveis de Ca a 60 mg L-1. A solução a 100% dos macronutrientes propiciou o maior comprimento das plantas. O número de ramos entre os níveis de N e P seguiu uma tendência linear e crescente com as concentrações desses nutrientes, porém em maior proporção para o fósforo. As condições mais favoráveis ao desenvolvimento das plantas ocorreram a 100% dos macronutrientes da solução base. Entre os níveis de nitrogênio verificaram-se maiores teores de N nas folhas do que nos caules. Já para os demais nutrientes a alocação desses recursos foi destinada em maior proporção para o caule. A maior alocação de biomassa nesta espécie destinou-se ao caule.
The objective of this work was to verify the effect of different macronutrient concentrations on plant growth and dry biomass allocation in leaves, stems and roots of Myriophyllum aquaticum. The plants were cultivated in plastic pots filled with washed sand and immersed in nutritive solution. The study was carried out in a randomized complete design with four levels of nutrition solution at 0, 25, 50, 75% from the original concentration solution of N, P, K Ca, Mg and S, besides a control (100% of the nutritive solution) with 4 replications for 38 days. The largest production of total biomass was obtained in the control plot. The absence of K affected biomass allocation in the roots. The highest total branch length was found among the levels of Ca at 60 mg L-1. The solution at 100% of the macronutrients provided the largest plant length. The number of branches among the N and P levels followed a linear and growing tendency with the concentrations of these nutrients, but in a larger proportion for phosphorus. The most favorable conditions to plant development were at 100% of the macronutrients in the solution base. The highest N levels were verified in the leaves rather than in the stem while for the other nutrients, the greatest allocation was in the stem. Maximum biomass allocation in this species was observed in stems.
The objective of this work was to verify the effect of different macronutrient concentrations on plant growth and dry biomass allocation in leaves, stems and roots of Myriophyllum aquaticum. The plants were cultivated in plastic pots filled with washed sand and immersed in nutritive solution. The study was carried out in a randomized complete design with four levels of nutrition solution at 0, 25, 50, 75% from the original concentration solution of N, P, K Ca, Mg and S, besides a control (100% of the nutritive solution) with 4 replications for 38 days. The largest production of total biomass was obtained in the control plot. The absence of K affected biomass allocation in the roots. The highest total branch length was found among the levels of Ca at 60 mg L-1. The solution at 100% of the macronutrients provided the largest plant length. The number of branches among the N and P levels followed a linear and growing tendency with the concentrations of these nutrients, but in a larger proportion for phosphorus. The most favorable conditions to plant development were at 100% of the macronutrients in the solution base. The highest N levels were verified in the leaves rather than in the stem while for the other nutrients, the greatest allocation was in the stem. Maximum biomass allocation in this species was observed in stems.
Descrição
Palavras-chave
planta daninha, planta aquática, crescimento, weed, aquatic plant, growth
Como citar
Planta Daninha. Sociedade Brasileira da Ciência das Plantas Daninhas , v. 23, n. 2, p. 193-201, 2005.