Fish emulsion: 1 Tablespoon/gallon of water
You can use that pretty much anytime at that
concentration. It is organic, bacteria need to
break it down to make the nutrients available
to plants, it won't burn seedlings. Beware of
fish emulsion that has anything "extra" added
(kelp/seaweed are ok, but not refined chemicals;
chemical burn is the big risk with fertilizing seedlings).
Some people believe that fish emulsion increases the
risk of damping off young seedlings, so one may want
to hold back if the early spring weather is especially
wet or humid until they get some sets of leaves.
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