A study was done to see how different fertilizers affect tomato and potato crops. Using a humic acid complex fertilizer called Grow Flow 45H led to higher yields for both crops compared to chemical fertilizers. The potato yield increased by 9.3% compared to chemical fertilizer and 88.2% compared to no fertilizer. For tomatoes, the yield increased by 7.7% with Grow Flow 45H compared to just chemical fertilizer. The quality of the crops also improved with this fertilizer, showing better leaf chlorophyll content, skin color, lycopene content, acidity, and other factors. Another humic acid complex fertilizer, HA-NPK, also had positive effects on crop quality. Overall, using these humic acid complex fertilizers can lead to better yields and quality for tomato and potato crops.