Author: Natalie Hoidal, UMN Extension Educator, Local Foods and Vegetable Production With so many types of available soil tests available, how do you know which analyses to select, and how often should you do each one? As of the publishing of this article, the University of Minnesota Soils Lab is still processing samples. Due to COVID-19 precautions, they cannot accept in-person drop-offs, and all samples must be submitted through the mail. Due to reduced staffing, your sample may be delayed. Soil test forms have many options, it can be difficult to know which tests you need. There are a few nutrients and soil properties that can be measured reliably with a soil test, and should be done every 2-3 years. Organic Matter Organic matter is a good basic measure of soil health and is a reservoir of nutrients essential for plant growth. This test should be done every few years when organic matter levels are optimal. If your organic matter is low, consider a soil tes...
