NutriFlo Nitro-Sul contains 16% nitrogen and 34.6% sulphur w/v. The high level of sulphur within Nitro-Sul makes it ideal for use on plants with a sulphur deficiency. As sulphur is not very mobile in the plant, the main symptom of sulphur deficiency is yellowing of fresh growth rather than on older growth. NutriFlo Nitro-Sul also contains the macronutrient nitrogen, which helps the sulphur be used efficiently.
In years gone by, sulphur was readily available in the atmosphere as a waste product from industry. Due to the Clean Air Act, there are no longer any natural sources of sulphur available in the UK. Sulphur is vital for making the most efficient use of nitrogen in plants. Regular applications of sulphur have also demonstrated an ability to prevent some diseases and pest infestations.