Dry power vs Liquid fertilizer

They all work, you just need to find the right type for your system. Sadly your fighting a ton of marketing instigated confusion and polarisation. Granular fertilisers are generally mineral based and require soil biology to release much of the content. Organic fertilisers are carbon based inputs derived directly from natural sources, and also require soil biology to release much of the content. Synthetic fertilisers are indistinguishable to the plant, but come in a salt-bound form that is highly available to the plant without biology dependant release. Compound fertilisers are little balls of synthetic fertiliser that dissolves in the flow of water at a given rate. Fertilisers can be organic or synthetic, or a blend. Read the label. Exclusively organic liquid fertilisers are suspensions or enzymatically hydrolyzed organic components. Exclusively synthetic liquid fertilisers are simply a liquid suspension of the dry equivalent that can be applied completely at a consistent concentration. In most cases, due to the antagonistic relationship between Calcium and Phosphorus, the Calcium is included as another part or not at all. But is still required, and something you'll need to account for either way. Organic has it's place, but the majority of what I hear and read is hype and emotion. In any case; getting the right nutrient element ratio and applying an optimal concentration is an essential consideration of them all.