I'm making my own inorganic liquid fertilizers from scratch but I keep having pH drift issues. These fertilizers are made of traditional ag inputs (calcium nitrate, potassium phospahte, etc) and follow the tradtional 3-part Grow/Bloom/Calcium-input formulation. The fertilizers have a pH of 3.5, 3.5, and 5.5. I've looking to buffering inputs in that range a little bit and its seems citrate or an acetate buffer could be the best route to go. Are these good options or should I look at other buffers?