Agricultural testing services for soil, plant tissue, water, fertilizer, feed, seed, and manure. AGVISE Laboratories provides a complete line of agricultural testing services and technical support to the United States and Canada. With laboratories in Northwood, North Dakota and Benson, Minnesota, we are a leader in soil testing and plant analysis. Our testing services include GLP and non-GLP certified analysis. For commercial soil and plant analysis, our customers include crop consultants, ag retailers, and agricultural producers. For GLP soil and water testing, we serve engineering firms and research companies involved in pesticide registration.