Liquid nutritional product to prevent or correct malnutrition Zn or/and Mn. Thanks to its gluconate chelating agent, immediate absorption, good penetration and immediate yield of the elements in the plant are ensured. It is suitable for foliar application especially in cases where the plants have difficulty absorbing these elements from the soil (eg alkaline or sandy soils). Lack of them causes disturbances in the physiology of plants reducing the efficiency of photosynthesis and can affect the yield of each crop, even before the appearance of external symptoms of deficiency. Therefore, it is necessary to provide them proactively, without expecting a shortage, especially in kiwis, citrus fruits and vegetables.