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Plant Biostimulant

A substance or microorganism applied to plants or soil that supports a plant's natural processes (like nutrient use or stress tolerance) and improves growth or quality, without acting primarily as a fertilizer.

Plant Regulator

A substance that changes how plants grow or mature, either speeding it up or slowing it down. This bill specifically excludes plant biostimulants from this category.

Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA)

A federal law that governs the registration, distribution, sale, and use of pesticides in the United States.

Rhizosphere

The narrow region of soil directly surrounding plant roots, where many of the roots' activities and interactions with soil organisms occur.

Abiotic Stress

Harmful environmental factors that are non-living, such as drought, extreme temperatures, salinity (saltiness), or nutrient deficiencies, which can negatively affect plant growth.

Nutrient Use Efficiency

How well a plant is able to take up and utilize available nutrients from the soil to grow and produce yield.