Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Registro completo
Provedor de dados:  Phyton
País:  Argentina
Título:  Chlorination: phytotoxicity and effects on the production and quality of Lactuca sativa var. Mantecosa grown in a closed, soil-less system
Autores:  Premuzic,Z
Palmucci,HE
Tamborenea,J
Nakama,M
Data:  2007-12-01
Ano:  2007
Palavras-chave:  Chlorination
Lactuca sativa
Nitrates
Phytotoxicity
Vitamin C
Resumo:  The addition of chlorine constitutes an economical disinfection method for closed, soil-less systems. Three quantities of sodium hypochlorite (0.55, 5.5 and 11 ppm) were applied to closed, soil-less greenhouse- grown lettuce (Lactuca sativa), to study the effect on its production (fresh weight and dry matter) and some commercial and nutritional quality factors (phytotoxicity, Vitamin C, nitrates). Sodium hypochlorite was weekly added within the nutrient solution, and the chemical properties (pH, EC and chlorides) of the recycled solution were measured. Damage to leaves was evaluated 15 days before harvest. Chlorination produced different effects regarding both production and quality. All treatments presented plants with excellent commercial weight, although quantities of 0.55 and 5.5 ppm presented a 17% greater weight. However, this improvement was statistically not significant. Three different groups were observed for the phytotoxicity effects: the 11 ppm dose showed 42% of damage to leaves, while leaf damage was 22% for the 0.55 and 5.5 ppm quantities, and 15% for the control. The addition of sodium hypochlorite did not affect (significantly) Vitamin C and dry matter production. All treatments presented nitrate contents exceeding the allowed values; this fact was related with the nitrate composition of the nutrient solution. The chemical properties of the nutrient solution were adequate for the species. This study suggests the 0.55 and 5.5 ppm quantities as a positive option regarding plant weight. Further research should be developed to adjust fertilization, and to diminish the phytotoxicity symptoms.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100010
Editor:  Fundación Rómulo Raggio
Formato:  text/html
Fonte:  Phyton (Buenos Aires) v.76 2007
Direitos:  info:eu-repo/semantics/openAccess
Fechar
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional