Desempenho fisiológico de Romãzeira tratadas com aplicações foliares de microalgas.

Abstract

The use of microalgae has aroused interest in several areas due to the chemical properties of their biomass. With applications in the areas of bioenergy, agriculture, food and pharmaceuticals, among other applications such as biodiesel production and plant production, especially as it acts as a biostimulant. In this sense, this research aims to analyze the physiological performance of pomegranate in the early stages of development in the field under the effect of microalgae biomass applied via foliar. The experiment was carried out at the Experimental Farm of the Federal University of Campina Grande (UFCG) using a randomized block design (DBC) in a 2 x 4 x 5 factorial scheme, consisting of: two microalgae (Spirulina platensis and Scenedesmus sp.) and four different concentrations of 0; 0.5; 0.10 and 0.15% distributed in five blocks in a total of 40 plants. The seedlings were produced in pots in a greenhouse, selected and standardized by size to be transplanted to the field at a spacing of 3.5 x 4.5 m with a depth of the pits of 40 x 40 x 40 cm. At 54 days after transplanting (DAT) the seedlings in the field, the analyzes were performed. The physiological performance of pomegranate in its early stages of development showed a significant decrease in the number of mature leaves as well as growth of its branches when it received application of the microalgae Scendesmos. The performance of the pomegranate after the use of microalgae showed a significant improvement, observing that the application of Scendesmos stimulated the growth of branches and the chlorophyll contents of the pomegranate 30 days after transplanting and the biofertilizer Spirulina can be applied to increase the sprouting of the pomegranate. pomegranate as well as its phytomass accumulation. The use of microalgae in the initial phase of development of “Mollar” pomegranate plants in the field provided gains in phytomass. Spirulina platensis provided an increase in the number of shoots and in the fresh mass of the plants, while Scenedesmus sp., provided greater growth of the branch, however, it did not influence the number of shoots and fresh mass.