It varies according to the structure of the plant and the soil, generally from the leaf;  70 to 100 g per 100 liters of water for vegetables  80 to 90 g per 100 liters of water for fruit trees  Using the drip irrigation system, 0.5 kg of fertilizer per decare is mixed with 100 liters of water and applied twice at 15-20 day intervals.  If magnesium deficiency persists, the application is repeated.