Concentrações da solução nutritiva em melanciera cultivada em ambiente protegido e a céu aberto.

Abstract

The cultivation in greenhouses has presented a number of advantages, such as increased productivityl improved product qualityl decrease in seasonality of supplyl providing greater competitiveness for the possibility of offering quality products all year round, even in the off seasonl better use of factors of production, especially fertilizers, pesticides and waterl total or partiam control of climatic factorsl keep workers in the field, reducing the rural exodus and creating jobst improvements in the conditions of the workplacel and option to increase profitability of agricultural enterprise (MARTINS, 2003). In addition to requiring a particular environmental conditioning plants, require a good nutrient supply se that they have.a good production and development during their life cycle. This work aimed to evaluate the effect of the different nutrient concentrations in the nutrient solution applied in different types of environments in the growing of watermelon. The experiment was carried at the Centro de Ciências e Tecnologia Agroalimentar (CCTA), Campus - Pombal/PB, belonging to the Universidade Federal de Campina Grande, from 04/2012 to 07/2012 in greenhouse and natural environment, using the watermelon hybrid 'Quetsali' (Crimson Sweet type). The treatments consisted of ave leveis of nutrients concentration in the nutrient solution in watermelon (12.5%; 25%; 50%l 75%. and 100%) and three types of environments (Greenhouse with plastic, greenhouse with shading and plastic, and natural environment). .The experimental design was completely randomized with four repetitions. The nutritive solution used as a base it was Hoagland and Arnon in concentration of 100%. Using this solution, it was obtained by dilution the other concentrations. The open-air environment along with the nutrient solution concentrations influenced the increase in growth characteristics of watermelon. Increases were assigned the values of the physiological characteristics of watermelon in the environments of open-air and greenhouse with plastic cover and shading the sedes when used nutrient concentrations in the nutrient solution.