GOMES, F. A. L.; http://lattes.cnpq.br/9243233492333523; GOMES, Fernando Antonio Lima.
Resumo:
The use of microalgae has been gaining prominence in the agricultural scenario, since it is an alternative product in a very productive way, containing essential elements for plants and is defined as a biostimulant. The objective of this work was to evaluate the morphophysiology of seedlings of Punica granatum L. treated with Spirulina platensis and Scenedesmus sp. Nanoparticles protected environment. The research was carried out in the Center of Sciences and Technology Agrifood of the Federal University of Campina Grande, Pombal-PB, using the completely randomized design (DIC), with five repetitions, in 40 experimental plots. The factorial scheme (2 x 4), types of microalgae x doses of applications (Sp. Platensis, Scenesdesmus sp. X 0, 0.05, 0.10, 0.15%) were adopted. A total of 130 seedlings were used, in which there was a glue of 40 vigorous seedlings used in the treatments of the use of microalgae nanoparticles. The pomegranate seedlings were sprayed with microalgae nanoparticles, after 120 days of planting (DAP). With 135 (DAP), the evaluations of shoot length and number of leaves were carried out in an increase of 0.10% in the seedlings and in the number of new branches with doses of 0.15%. The gas exchange variables were the stomatal conductance and the internal concentration of CO2that increased in Sp. Platensis. The fluorescence variables were the electron transport rate, stationary fluorescence in light; maximum fluorescence after adaptation to saturating light was higher in the seedlings sprayed with 0.10% of Spirulina Platensis and the quantum efficiency of FSII with Scenedesmus sp. The pomegranate saplings were sprayed at doses of 0.05 and 0.10% of S Plantesis. Thus, the doses of the applied microalgae species promoted a greater absorption of light by the photosynthetic pigments. The non-occurrence of significant effects on physiological aspects of the plant may be associated with environmental factors.
