7 Pa. Code § 73.6 - Slowly available plant nutrients
(a) No
fertilizer label may bear a statement that implies the presence of a slowly
available plant nutrient unless the nutrient is identified on the
label.
(b) If a fertilizer label
implies that nitrogen is slowly available, for example, organic nitrogen, the
guaranteed analysis shall indicate the percentage of water-insoluble nitrogen
in the material.
(c) If the label
states the amount of organic nitrogen present in a phrase such as "25% of the
nitrogen from ureaformaldehyde (Ureaform)," the water-insoluble nitrogen
guarantee may be not less than 60% of the nitrogen so designated.
(d) If the water-insoluble nitrogen is less
than 15% of the total nitrogen, the label may not bear designations such as
"organic," "ureaform" or similar terms.
(e) The phrases "coated-slow release
fertilizer" and "coated-slow releast" are acceptable descriptive terms for
products for which a testing program has substantiated the claim.
Water-insoluble nitrogen shall be guaranteed at 15% of the total nitrogen level
for slow release materials.
(f) The
Association of Official Analytical Chemists Test Method as prescribed in
Methods of Analysis shall be used to substantiate the presence
of slow release materials. It is permissible to eliminate grinding during
sample preparation.
Notes
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