Luz suplementar na produção de mudas de alface e couve-flor

Abstract

Agriculture is of paramount importance to the economy. Many factors are involved in the success of crop, among them nutrition, sanity, genetics and climatic order factors such as temperature, humidity and luminosity. In order to improve and accelerate the development conditions of lettuce and cauliflower crops, a study was carried out on the effect of the use of supplemental artificial light on the production of lettuce and cauliflower seedlings. Sowing was performed in sofoe trays under floating irrigation system. Part of the experiment containing the two species received the treatment with LED light (led emitting diode) for four hours/day, in addition to solar radiation and the others plants received only solar radiation, that is, the natural photoperiod. After 37 days, biometric parameters were analyzed (leaf areas, root length, air dry mass and root dry mass) and biochemical (phenolic compounds, flavonoids, chlorophyll a/b and total chlorophyll). The data obtained revealed that complementary light was responsive in all biometric parameters evaluated in the experiment for both lettuce and cauliflower. Biochemical parameters in lettuce were also higher in plants with light supplementation. For cauliflower, the supplementary light did not present advantages for biochemical parameters and in the case of total phenolics showed reduction. It is concluded that supplemental light can be used to optimize the seedling development process reducing production time. [resumo fornecido pelo autor]