variabilidade espacial do sistema radicular do tomateiro e implicações no manejo da irrigação em cultivo sem solo com substratos spatial variability of tomato rooting system and implications on irrigation management in soiless cropping with substrates

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ID: 134718
2005
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Abstract
Avaliou-se a distribuição de raízes do tomateiro e a variabilidade horizontal do potencial matricial (psim) e da condutividade elétrica da solução em substratos, de fibra de coco verde, casca de arroz carbonizada, maravalha carbonizada e comercial, acondicionados em sacos de plástico do tipo bisnaga. Cada planta foi irrigada por um único gotejador, posicionado a 7 cm da mesma. Maior concentração de raízes e menores valores de psim, sob condições de déficit hídrico temporário, ocorreram junto às plantas, nos substratos de fibra de coco e casca de arroz, e junto aos gotejadores, nos de maravalha e comercial. A baixa concentração de raízes entre um gotejador e a planta subseqüente, irrigada por outro emissor, ocorreu, provavelmente, pela alta condutividade elétrica da solução do substrato nessa região (até 8,3 dS m-1). As correlações entre concentração de raízes versus psim e concentração de raízes versus condutividade foram significativas para todos os substratos. A avaliação da variabilidade do psim nos substratos, em plantas submetidas a déficit hídrico, permitiu avaliar qualitativamente a distribuição do sistema radicular do tomateiro, de forma mais prática que pelo método direto. Para fins de manejo da água, recomenda-se instalar os sensores de umidade entre a planta e seu respectivo gotejador.
The distribution of tomato rooting system and horizontal variability of matric potential (psim) and electrical conductivity of the solution were evaluated on green coconut fiber, carbonized rice husk, carbonized coarse sawdust and commercial substrates packed in plastic bags. Each plant was irrigated by a single dripper, set up 7 cm apart. Higher root concentrations and lower psim, under temporary water deficit conditions, occurred close to the plant for coconut fibers and rice husk, and close to the dripper for coarse sawdust and commercial substrates. The lower root concentration between a dripper and the following plant, irrigated by another emitter, occurred probably due to the high electrical conductivity of the nutrient solution in that zone (up to 8.3 dS m-1). Correlations between root concentration versus Ym and root concentration versus electrical conductivity were significant for all substrates. Evaluation of psim variability on substrates for plants exposed to water deficit allowed a qualitative estimation of the root system distribution of tomato crop, easier than the direct method. For irrigation scheduling purpose, moisture sensors should be placed between the plant and its respective dripper.
Reference Key
marouelli2005horticulturavariabilidade Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Waldir A. Marouelli;Osmar A. Carrijo;Sérgio Zolnier
Journal research on biomedical engineering
Year 2005
DOI
10.1590/S0102-05362005000100012
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362005000100012
Keywords
Electrical conductivity tensiometerplant culture

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