Detailed Guide on How to Mix MasterBlend Nutrient 8 15 36 for Lettuce Why are my tomato leaves turning yellow even though fertilizer has already been applied. Many gardeners overlook soil pH. If the soil becomes too acidic or too alkaline, nutrients become chemically locked LESCO 24 0 11 Fertilizer You're putting the same fertilizer on every plant in your garden. The lettuce that needs nitrogen for leaves is getting the same feed as the tomato that needs phosphorus for fruit. Different