Foliar application isn't the only way to apply seaweed emulsion, but it is the quickest and most efficient way to get its nutrients straight into the plant. You can see results (yellowish leaves greening up, improved pest resistance) within a day or two. When you spray or pour it on the soil, some of it gets absorbed into soil particles and taken up by soil organisms in competition with that getting absorbed by the root hairs and mychorrhizae, so it is slower to get into the plant and you have to apply more of it to have the same effect on the plant.
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