Avaliação de cultivares de alface crespa produzidas em hidroponia tipo NFT em dois ambientes protegidos em Ribeirão Preto (SP)
Carregando...
Data
2007-01-25
Autores
Sanchez, Sergio Veraguas [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Devido a mudanças no hábito alimentar o consumo de alface vem aumentando, sendo seu fornecimento diário, o ano todo. Sendo assim, o cultivo hidropônico tem sido adotado por muitos produtores. Apesar disso, muitas cultivares ainda não são adaptadas a essa tecnologia. O objetivo deste trabalho foi avaliar o desempenho de cinco cultivares de alface em dois ambientes de cultivo no sistema hidropônico, tipo NFT, no período de 06/02 a 07/04 de 2006 em Ribeirão Preto, estado de São Paulo, Brasil. Para isso as cultivares Pira Roxa, Pira Vermelha, Locarno, Crespona gigante e Verônica foram avaliadas em casa de vegetação convencional e climatizada em sistema NFT (Técnica do fluxo laminar de nutrientes). O delineamento experimental foi em blocos casualizados, sendo cinco cultivares em três blocos. A colheita foi realizada aos 61 dias da semeadura sendo avaliadas a massa fresca e seca da parte aérea, caule e raízes; número de folhas maiores que 10 cm e número total de folhas. A cultivar Crespona gigante não diferiu da cv. Verônica em massas fresca e seca da parte aérea, mas foi superior às cultivares Pira Vermelha, Pira Roxa e Locarno. As cultivares Pira Roxa e Pira Vermelha sugeriram melhor adaptação, indicando maior resistência ao pendoamento. Não houve efeito significativo para a interação, cultivares e ambientes, mostrando que as cultivares comportaram-se de forma semelhante nos dois ambientes. Houve um maior consumo de água pelas plantas de alface na casa de vegetação convencional em relação à climatizada, provavelmente devido às maiores temperaturas e à menor umidade relativa do ar. A extração de nutrientes pelas folhas de alface (média de cinco cultivares) obedeceu a seguinte ordem decrescente: K>N>Ca>Mg>P>S>Fe>Mn>Zn>Cu.
Due to changes in feeding habits, lettuce consumption has been increasing and must be supplied daily throughout the year. As a result, many producers have adopted hydroponics cultivation. In spite of this, many cultivars are not yet adapted to this technology. The objective of this study was to evaluate the performance of five lettuce cultivars grown in two environmentals in NFT (Nutrient Film Technique) hydroponic system in the period from Feb/06 to Apr/07 2006 in Ribeirão Preto, state of São Paulo, Brazil. To accomplish this, cultivars Pira Roxa, Pira Vermelha, Locarno, Crespona gigante, and Verônica were evaluated in conventional and climatizated greenhouse in the NFT system. A randomized-block experimental design was used, consisting of five cultivars in three blocks. Harvest was performed 61 days after seeding. Evaluations were made for fresh and dry mass of the aerial part, stem, and roots; number of leaves larger than 10 cm; and total number of leaves. Cultivar Crespona gigante in fresh weight and dry matter of the aerial part did not differ from cultivar Verônica, but it was superior to them cultivars Pira Roxa, Pira Vermelha and Locarno.The cultivars Pira Roxa and Pira Vermelha suggested a better adaptation, showing better resistance to bolting. There was no significant effect of the cultivars OE environments interaction, demonstrating that the cultivars had similar behaviors in both environments. There was a larger consumption of water by the lettuce plants under the conventional greenhouse conditions in comparison to the acclimated one, probably due to their higher temperatures and lower air relative humidities. The extraction of nutrients by leaves lettuce plants (average five to cultivate) obeyed to the followed the decreasing order: K>N>Ca>Mg>P>S>Fe>Mn>Zn>Cu.
Due to changes in feeding habits, lettuce consumption has been increasing and must be supplied daily throughout the year. As a result, many producers have adopted hydroponics cultivation. In spite of this, many cultivars are not yet adapted to this technology. The objective of this study was to evaluate the performance of five lettuce cultivars grown in two environmentals in NFT (Nutrient Film Technique) hydroponic system in the period from Feb/06 to Apr/07 2006 in Ribeirão Preto, state of São Paulo, Brazil. To accomplish this, cultivars Pira Roxa, Pira Vermelha, Locarno, Crespona gigante, and Verônica were evaluated in conventional and climatizated greenhouse in the NFT system. A randomized-block experimental design was used, consisting of five cultivars in three blocks. Harvest was performed 61 days after seeding. Evaluations were made for fresh and dry mass of the aerial part, stem, and roots; number of leaves larger than 10 cm; and total number of leaves. Cultivar Crespona gigante in fresh weight and dry matter of the aerial part did not differ from cultivar Verônica, but it was superior to them cultivars Pira Roxa, Pira Vermelha and Locarno.The cultivars Pira Roxa and Pira Vermelha suggested a better adaptation, showing better resistance to bolting. There was no significant effect of the cultivars OE environments interaction, demonstrating that the cultivars had similar behaviors in both environments. There was a larger consumption of water by the lettuce plants under the conventional greenhouse conditions in comparison to the acclimated one, probably due to their higher temperatures and lower air relative humidities. The extraction of nutrients by leaves lettuce plants (average five to cultivate) obeyed to the followed the decreasing order: K>N>Ca>Mg>P>S>Fe>Mn>Zn>Cu.
Descrição
Palavras-chave
Alface - Cultivo, Hidroponia, Alface crespa, Soilles cultivation, NFT - hydroponic system
Como citar
SANCHEZ, Sergio Veraguas. Avaliação de cultivares de alface crespa produzidas em hidroponia tipo NFT em dois ambientes protegidos em Ribeirão Preto (SP). 2007. xiii, 63 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2007.