Abstract: The invention relates to a fertilizing compound for application to plants and crops, especially fruits, intended for increasing the amount of calcium and subsequently improving the state of health of the plants and the preservation thereof after harvesting. The compound consists of a combination of components such as calcium nitrate, calcium lignosulfonate, organic acids, menadione sodium bisulphite, amino acids and water. The compound is in the form of a liquid preparation, packed in containers of between 20 and 1000 liters, is water-soluble and is applied by fertigation, spraying or in a localized form by border irrigation.