Process for obtaining a liquid foliar fertilizer for spraying onto the leaves of plants wherein said process comprises the following steps: (a) in a first container dilute a strong base in water until reaching a mass concentration of about 5% to about 25% at a temperature between about 30 °C and about 50 °C and stir until complete dissolution; (b) add castor oil in the ratio of about 70% to about 90% of the mass of item (a) above and an alcohol in the ratio of about 3% to about 12% of the mass of item (a) above, stirring strongly, leaving to rest and then stirring again (c) in a second container dilute sulfuric acid in water up to about 40% to about 65% by weight at a temperature of 0 °C; (d) without stirring, add to the mixture of the second container the mixture of the first container, followed by stirring; (e) stop the stirring and leave to rest; when phase separation occurs drain the lower phase and discard it; (f) to the product obtained in step (e) add water in an amount of about 30% to about 55% of the mass of item (a) above, stir, and leave to rest; after phase separation drain the lower phase (waste) and discard it; (g) to the product obtained in the previous step add water in an amount of about 30% to about 55% of the mass of item (a) above, stir, and leave to rest; after phase separation, discard the lower phase; (h) add triethanolamine in a container, then water and later the product obtained in the previous step (g), in the following ratio by mass: - 2 parts ricinoleic acid saponified with sulfuric acid; - 1 part triethanolamine (C 6 H 13 NO 3 ), - 2 to 10 parts water. (a) in a first container dilute a strong base in water until reaching a mass concentration of about 5% to about 25% at a temperature between about 30 °C and about 50 °C and stir until complete dissolution; (b) add castor oil in the ratio of about 70% to about 90% of the mass of item (a) above and an alcohol in the ratio of about 3% to about 12% of the mass of item (a) above, stirring strongly, leaving to rest and then stirring again (c) in a second container dilute sulfuric acid in water up to about 40% to about 65% by weight at a temperature of 0 °C; (d) without stirring, add to the mixture of the second container the mixture of the first container, followed by stirring; (e) stop the stirring and leave to rest; when phase separation occurs drain the lower phase and discard it; (f) to the product obtained in step (e) add water in an amount of about 30% to about 55% of the mass of item (a) above, stir, and leave to rest; after phase separation drain the lower phase (waste) and discard it; (g) to the product obtained in the previous step add water in an amount of about 30% to about 55% of the mass of item (a) above, stir, and leave to rest; after phase separation, discard the lower phase; (h) add triethanolamine in a container, then water and later the product obtained in the previous step (g), in the following ratio by mass: - 2 parts ricinoleic acid saponified with sulfuric acid; - 1 part triethanolamine (C 6 H 13 NO 3 ), - 2 to 10 parts water. - 2 parts ricinoleic acid saponified with sulfuric acid; - 1 part triethanolamine (C 6 H 13 NO 3 ), - 2 to 10 parts water. <EOS>