Evaluation of the hydroponic lettuce using water from fish production system mixed with different percentage of nutritive solutions / Avaliação da alface hidropônica usando água de piscicultura misturada com diferentes porcentagens de soluções nutritivas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The present work was carried out in plastic greenhouse, at Escola Agrotécnica Federal de Concórdia, State of Santa Catarina, Brazil, with the purpose of evaluating the agronomic performance of the lettuce crop, cultivar Vera, under hydroponic system using water from fish production mixed with different percents of macro and micronutrients in the nutritive solution; and of evaluating the increment of dry mass, analyzing the leaf nitrate (NO3 -) content of the lettuce at harvest. The following treatments were used: (T1) water with 100% of the nutritive solution described by Castellane and Araújo (1995) (control); (T2) water from fish production mixed with 50% of the nutritive solution of the treatment T1; (T3) water from fish production mixed with 100% of the micronutrients of the nutritive solution of the treatments T1 and T2; and (T4) water from fish production, only. The results show that: (a) the residual water from fish production system (Tilapia) in dams, in the semi-intensive system, is unable to provide the nutrients necessary for growth and development of lettuce plants for commercial proposes; (b) the lettuce production using the semi-intensive system with water from the fish production system is technically feasible in dams, if conducted an additional fertilizer to attend the nutritional needs of plants; (c) the treatment T1 (control) presented the better results, where the plants reached a green and dry mass of 378.70g and 19.97g, respectively; (d) the treatment T2 did not present significant difference to treatment T1 (control), with 293.59g and 19.28g, respectively, which shows an effectiveness of semi-intensive system, and it is perfectly feasible from nutritional adjustments; (e) the treatment T1 (control) presented the highest nitrate content at 28 days after transplant, with 793.3mg.kg-1 of NO3 -, however, within acceptable limits for human consumption of leaf lettuce.

ASSUNTO(S)

alface nutrição vegetal piscicultura hydroponic system. nutritive solution hidroponia lactuca sativa soluções

ACESSO AO ARTIGO

Documentos Relacionados