Efeito de doses e épocas de aplicação de extrato de Algas de Água Doce em caracteres morfológicos para duas cultivares de Arroz no Cerrado brasileiro.

Abstract

Rice is the main food for Brazilians and research that allows for an increase in productivity is essential for us to produce more and at lower costs. The following work objective was to evaluate the biomass and leaf area of rice plants using five doses of freshwater algae extract (0ml/L; 10ml/L; 20ml/L; 30ml/L and 40ml/L) applied in vegetative stages four and nine under cultivars IRGA 424 and IRGA 426. The experiment was conducted in a greenhouse on the UFT campus in Gurupi during the years 2020 and 2021 using a 2x2x5 factorial scheme in a completely randomized design with three replications. Leaf area and leaf mass, plant height, root system mass, total dry mass, productivity and weight of one hundred seeds were evaluated. The dose of 40ml of syrup extract/L resulted in the increment of all variables analyzed, both for growth and development, both for productivity. The second application season provided higher grain yield and weight of one hundred seeds, while the first application provided a greater increase for the leaf mass and area. Key-words: Chlorella. Spirulina. Cytokinins. Auxins. Biofertilization.