Wisconsin Governor Tony Evers signed Senate Bill 78 into law, modifying distribution and labeling requirements for manure-based compost soil and plant additives. With limited exceptions, state law prohibits packaged fertilizer distribution without a label showing guaranteed analysis. Bulk fertilizer is subject to similar regulation.

The new law reduces testing and labeling requirements for fertilizer produced from converting manure into compost. It removes the need for guaranteed analysis and permits distribution even if the nitrogen, phosphorus, and potassium total less than 24% of the product’s weight.

This article appeared in the May 2026 issue of Journal of Nutrient Management on page 5.

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