343.T1

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Fertilizer Labels and Calculations

Fertilizer Label Information

• Most fertilizer labels contain the following information:

– Net weight.

– Guaranteed analysis.

– Name and address of manufacturer.

343.T2

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Fertilizer Labels and Calculations

Additional Label Information

• Additional information which may be found on fertilizer labels is:– Percentage of water insoluble nitrogen (WIN).– Potential acidity.– Salt index.– Source or carrier.– Percentage of minor elements.

343.T3

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Fertilizer Labels and Calculations

Calculating the Best Buy

• Formula used to compare different fertilizers:

Bag weight x %N = Amount of N per bag

Cost per bag = Cost per lb. of N

Amount of N