This book was written as a result of two pieces of fieldwork I did during my degree in Agroecology Technology at the IFPB Sousa campus. The two pieces of work together took approximately two years of dedication, often having to put aside family life and leisure time to devote myself exclusively to field activities to collect data for the experiments. I used them respectively to write my final thesis and my monograph for the specialisation in soils that I did straight after finishing university. In order to carry them out, I had help from friends, teachers and administrative staff at the institution, including those mentioned here as co-authors of this work, who together with my family made it possible. I should mention that this is my first publication in book format, with me as the main author of the work, so I have high hopes for it, not only in terms of its sale, but also in terms of the information that will be available to people who obtain it as a copy.