by Claudio C. Pasian
Department of Horticulture and Crop Science
The Ohio State University
Micronutrient disorders are the fertility problems that I see most often while visiting growers as an Extension Specialist (Figure 1 and 2). Micronutrients (from the Greek Micro=small and nutrient=nutritive) are mineral elements needed by plants in small quantities. Small variations from the optimum level required for plant growth can be damaging. By the same token, levels slightly above those required for good growth can be toxic. It is very important for growers to have a clear understanding about micronutrient management. This article is a brief overview of the principles that control the availability of micronutrients in soilless mixes and how to correct imbalances.