Are there regulations on fertilizer products in California?
Yes, state law contains specific requirements for fertilizer products. By law, the guaranteed content of the fertilizer, expressed as a percentage of each plant nutrient supplied, must be stated on the bag or container. Under this labeling method, the first number shown is the percentage of nitrogen (N); the second is the percentage of phosphorus (P), expressed as P2O5 (phosphoric acid); and the third is the percentage of potassium (K), expressed as K2O (potash). A 100-pound (45.4-kg) bag of a 12-12-12 grade fertilizer contains 12 pounds (5.45 kg) each of N (nitrogen), P2O5 (phosphorous), and K2O (potassium). The other 64 pounds in the bag is filler, which facilitates even spreading of fertilizer. If any other plant nutrients have been added to the fertilizer, then they must be listed below the N-P-K content with their guaranteed percentage. Q: Is there any difference between a “fertilizer” and a “soil amendment”? A: Whether a material is considered a soil amendment or a fertilizer is
