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In this study, the fertility of cultivated soils was studied in 17 locations of farmers in Corfu for three cultivated species: kumquat, grapevine, and olive trees. Specifically, there were selected 5 farms of kumquat, 6 farms of vineyards and 7 farms of olive trees. The soil samples are composite and from 0-30 cm depth, except for the olive tree crops in which composite samples were taken from two depths of 0-30 cm and 0-60 cm. In total, 25 representative soil samples were taken from these cultivable areas to determine the basic properties of the soil and their nutritional status. The first chapter begins by presenting information about the island, its geography, and its climate, references to the agricultural history of crops on the island and the role of agriculture in the economy of the island, including statistical data. Furthermore, the ecological peculiarities of the island and the impact of agriculture on the environment are presented. Subsequently, the crops and varieties that are cultivated are analyzed, as well as their morphological and botanical characteristics and their requirements for soil, climate, altitude, and cultivation. Finally, fertilization is analyzed, specifically its significance, nutrient uptake, and recommended fertilization. The second chapter concerns the methods and procedures used to conduct the study. The soil analyses include the determination of the mechanical composition, organic matter concentrations, calcium carbonate content, pH, and electrical conductivity (EC), as well as the concentrations of nitrate nitrogen (N-NO3), available phosphorus (P), exchangeable potassium (K+), calcium (Ca2), and magnesium (Mg2+). Initially, the methodology used for data collection is described, including field observations and visits to farms and vineyards. In addition, the data analysis methods used to process the collected information are analyzed. The third chapter of the study presents the results and conclusions that emerged from the study of selected cultivated soils.