Information technology is present in virtually all areas of science as a productivity tool, assisting professionals in these areas in their daily work. In this sense, the objective of the research was the development of a free software for use over the Internet, with a friendly interface and intuitive navigation, for calculation of nutrient solution for fruit vegetables and leaves in hydroponic NFT system. To develop the software, we used the technologies PHP5 (Programming Language), MYSQL (Database), CSS5 (Style Language), HTML5 (Markup Language) and CodeIgniter (Framework). The software has among its functions the user registration, calculation of the nutrient solution and the issuance of reports in PDF format. Calculation of the nutrient solution is available for various crops. The calculation proposes the quantity of different fertilizers needed to prepare the nutrient solution for the chosen hydroponic crops. Two software known as Hidrosolun and Hidrosical (registration number BR 51201400613–1 and BR 51201400614–0) were created and registered at the National Institute of Industrial Property (INPI), a federal agency responsible for the registration of intellectual property rights for the industry. The software developed is easy to use, without the need to install hardware with high configurations.
Part of the book: Potassium