Midwestern BioAg, Inc., founded in Wisconsin, is a biological agriculture company dedicated to soil improvement and sustainable farming practices. The company's core mission is to enhance soil health and productivity through innovative solutions and consulting services. Their product lineup includes Bio-Cal®, a proprietary blend of calcium sources, and TerraNu fertilizers, which are designed to reduce nitrogen needs and improve crop yields. Midwestern BioAg also offers soil testing, fertilizer application, livestock ration balancing, seeds, feed ingredients, and forage and plant tissue analysis services, primarily serving the agricultural market in Wisconsin.

Notable figures associated with Midwestern BioAg include its founder Gary Zimmer, a prominent advocate for biological farming. The company has attracted investments from various agricultural and sustainability-focused investors. Key achievements include the development of their proprietary Bio-Cal® and TerraNu products, which have significantly improved soil productivity and reduced input costs for farmers. Midwestern BioAg's impact is evident in its contribution to more sustainable farming practices and enhanced agricultural productivity in the regions it serves.