Commercial Liquid Fertilizers

Fish emulsions, Seaweed extracts and Animeals Nitrisolas are easy and convenient to use. They are convenient for boosting crops with organic NPK should it become necessary during certain stages of growth.

However, liquids do little to assist in soil structure. You should not expect to succeed with continuous use of liquid fertilizers. Even though they provide plant nutrients quite well, they don't provide humus to the soil.

Home-made Liquid Fertilizers

Regardless of the excellent commercial liquid organic fertilizers available, every home gardener should have their own supplement of liquid manures that are so easily made with minimal equipment.
Any type of manure (from herbivores) is suitable as an infusion. Place the manure in a porous bag (a poly-net onion or orange bag is ideal). Hang it in a large plastic garbage bin filled with water.

The bag should be packed full and gently dunked up and down a few times during the brewing period. After about three weeks you have a very useful and gentle liquid fertilizer.
When it's ready you can even use it on young seedlings, but it should be diluted by about nine parts water to one part liquid manure. It is best used frequently as a weak solution, rather than as a stronger solution less often.

Urine is an excellent liquid fertilizer if diluted about one part to twenty parts water. If used at full strength it will kill many plants. However, undiluted urine added to the compost heap is an excellent accelerator, especially in heaps that contain a lot of woody material.

The golden rule in using any liquid manures is to use them diluted and frequently. Strong organic manures can be just as disastrous as chemical fertilizers if used without care.