; and (2) includes some plant biostimulants. (rr) Vitamin hormone product The term vitamin hormone product means a product consisting of a mixture of plant hormones, plant nutrients, inoculants, or soil amendments. . (c) Regulations Not later than 120 days after the date of the enactment of this Act, the Administrator of Environmental Protection Agency shall revise the regulations under subchapter E of chapter I of title 40, Code of Federal Regulations (as in effect on the date of the enactment of this Act) to carry out the amendments made by subsections (a) and (b). 3. Soil health study (a) Study The Secretary of Agriculture shall conduct a study to assess the types of, and practices using, plant biostimulants (as defined in section 2 of the Federal Insecticide, Fungicide, and Rodenticide Act ( 7 U.S.C. 136 )) that best achieve the following: (1) Increasing organic matter content. (2) Reducing atmospheric volatilization. (3) Promotion of nutrient management practices. (4) Limiting or eliminating runoff or leaching of soil or nutrients such as phosphorus and nitrogen into groundwater or other water sources. (5) Restoring beneficial bioactivity or healthy nutrients to the soil. (6) Aiding in carbon sequestration, nutrient use efficiency, and other climate-related benefits. (7) Supporting innovative approaches to improving agricultural sustainability, including the adoption of performance-based outcome standards and criteria. (b) Report Not later than 1 year after the date on which funds are first made available for the study under subsection (a), the Secretary shall make publicly available and submit to the Committee on Agriculture of the House of Representatives and the Committee on Agriculture, Nutrition, and Forestry of the Senate a report that describes the results of the study.