Content of micronutrients in maize grown for green fodder fertilized with suspension fertilizers based on waste phosphorus salts from the production of polyols

The need to import phosphorus raw materials for fertilization in Europe and the increasing amount of waste have driven the search for alternative phosphorus sources. One such waste material is sodium-potassium phosphate waste generated during polyol production. In addition, ensuring an adequate food supply remains a critical challenge, with fertilizers playing a key role. Due to the increase in meat consumption, the attractiveness of growing feed corn is increasing, given its high yield potential and rich composition. The article examines the effect of suspension fertilizers derived from polyol production waste on the micronutrient content of corn intended for green fodder. In a 3-year field study, the impact of the waste-derived phosphorus source was compared with a commercial granular phosphorus fertilizer, Fosdar 40. Additionally, the composition of suspension fertilizers was assessed, including those containing only basic nutrients (NPK) and those enriched with secondary nutrients (S, Mg) and micronutrients (Zn, Mn, B). The results confirmed the effectiveness of the tested suspension fertilizers. The micronutrient content in the dry matter of maize was comparable to that of the control treatment fertilized with Fosdar 40.two-step method.