I am not aware of a sulfur need. How do I determine if K-Mag Fertilizer should be utilized to provide sulfur?
All plants need sulfur. Typically, the wide range of crops actually use 15 to 50 pounds per acre of sulfur (S) depending on the type of crop and yield. Experience is the best indicator for sulfur fertilizer need. Sandy soils, low in organic matter in high rainfall areas, will invariably be low in sulfur. Because sulfur availability is impacted so greatly by environmental conditions, many universities and research organizations make a blanket recommendation for sulfur of 10 to 20 pounds per acre. The degree of soil deficiency and crop need help to define the amount of K-Mag to apply to meet the sulfur requirement. Soil testing for sulfur is not as reliable for predicting sulfur availability throughout the growing season as for other nutrients. Plant tissue analysis can be helpful in building an experience base.
