Polish academic and researcher Izabela Michalak has specialized in the study of applications for algal biomass. As a professor in the department of advanced materials technologies at the Wroclaw University of Science and Technology, she has a diversity of activities essential for human life. One of them is of course agriculture, where algae can play a central role in the stimulation and protection of crops, which she explains in this presentation made at the Biostimulants Congress Latam 2021. Redagrícola (Puedes revisar este contenido en español haciendo clic aquí) The content of the presentation is divided into the following parts: 1. Types and sources of algae 2. The characteristics of algae that make them useful in agriculture 3. The importance of algae biostimulants for agriculture and methodology for their extraction and application 4. Conclusions. 1. Types and sources of algae: The Polish specialist in algal biomass applications research presents the main classifications of algae and the places from which they can be obtained to produce useful products for agriculture. 2. The characteristics of algae that make them useful in agriculture The Polish specialist explains the unique properties of algae, which make them highly resistant plants to environmental changes, thanks to some properties that are key to stimulating and protecting crops.   3. The importance of algae biostimulants for agriculture and methodology for their extraction and application With concrete examples, Izabela MIchalak explains the reasons why bioproducts, such as algae, grow in agriculture both for control, food, and stimulation. These help feed efficiency, tolerance to biotic / abiotic stress, and crop quality. She also explains the extraction and preparation methodology for use in agriculture.   4. Conclusions Izabela MIchalak summarizes the main aspects for the use of algal biomass in agriculture.