FYI
From SRAC
https://srac.tamu.edu/fact-sheets/serve/300 Organic fertilizers have been recommended as pond
fertilizers—either alone or in combination with inorganic
fertilizers. However, organic fertilizers have many
disadvantages. Unlike inorganic fertilizers, organic fertilizers
have low nutrient content (Table 1 and 2), which
causes them to be more labor intensive to apply compared
to inorganic fertilizers. On an equal nitrogen basis,
it would require adding 290 pounds/acre (325 kg/ha)
cottonseed meal to equal the nitrogen added with only
58 pounds/acre (65 kg/ha) ammonium nitrate. The nutrients
contained in organic fertilizers are not readily available
and require the material to decompose before releasing
nutrients. When adding large amounts of organic
fertilizers, an additional oxygen demand is enforced in
the pond. Significant reductions in dissolved oxygen in
ponds receiving organic fertilizers are common. Organic
fertilizers are also often in a fine powder form easily
blown by the wind causing applicator discomfort.
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