When mixing multiple products in with your starter fertilizer be sure to make sure all the products you are adding are compatible. Products that are labeled for mixing with starter fertilizer usually have no problems, but adding multiple products in one mix can lead to problems. It is a good idea to test the compatibility of any combination of micronutrient, growth regulator, fungicide or insecticide with your starter fertilizer before filling an entire tank and losing a day of planting dealing with an issue. If unsure, check with your agronomist to confirm compatibility and to get the proper mixing order.