produção hidropônica de alface cv. verônica em diferentes substratos yield response of hydroponic lettuce grown on three different substrates

Clicks: 216
ID: 237844
1999
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Abstract
Em um experimento realizado na Fazenda Água Limpa da Universidade de Brasília, (DF), no período de setembro a novembro de 1997, foi avaliado o desempenho da alface, cultivar Verônica, em diferentes substratos, sob cultivo hidropônico. O delineamento utilizado foi inteiramente casualizado com três tratamentos: casca de arroz, brita e seixo, em 25 repetições. Após 62 dias de cultivo as plantas foram colhidas e avaliadas. Observou-se o peso da planta e da raiz, o número de folhas e o diâmetro da cabeça. As folhas mais novas foram coletadas para análise de macro e micronutrientes. As plantas que se desenvolveram em casca de arroz apresentaram peso, tanto de planta quanto de raiz, significativamente superior ao observado nos outros dois tratamentos. Não foi observada diferença estatística significativa para peso de planta e de raiz nos tratamentos brita e seixo. Quanto ao número de folhas e diâmetro da cabeça foram observadas diferenças estatísticas significativas entre todos os tratamentos, sendo que ambos foram maiores em plantas cultivadas em casca de arroz, seguida da brita e seixo. Não houve diferença estatística significativa na absorção de macronutrientes entre os tratamentos. As plantas cultivadas em casca de arroz absorveram significativamente menos zinco e cobre que as plantas cultivadas nos outros dois substratos.
In an experiment carried out between September and November 1997 at Fazenda Água Limpa, Universidade de Brasília, Brazil, growth and yield of lettuce cultivar Verônica were evaluated on three different substrates in a hydroponic system. The experimental design was a complete randomized block with three treatments: rice husk, gravel and pebble, with 25 replicates. After 62 days, plants were collected and plant and root weight, number of leaves and head diameter were evaluated. The younger leaves from plants from all treatments were also collected for macro and micronutrients analyses. Plants grown on rice husk showed significantly higher plant and root weight compared to those grown on gravel and pebble. No statistically significant difference was observed for plant and root weight in gravel and pebble treatments. Statistically significant differences between all treatments were observed on the basis of number of leaves and head diameter. Both parameters were higher in plants grown on rice husks, followed by gravel and pebble. No differences were observed in the absorption of macronutrients among treatments. However, plants grown on rice husk absorbed less zinc and copper than plants grown on gravel and pebble.
Reference Key
tavares1999horticulturaproduo Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Helton L. Tavares;Ana Maria R. Junqueira
Journal research on biomedical engineering
Year 1999
DOI
10.1590/S0102-05361999000300014
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05361999000300014
Keywords
gravel

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