I’m using MicroEssentialsS15 (S15) or MicroEssentialsSZ (MESZ) with my cereals, what are my seed safe rates?
S15 (13-33-0-15S) and MESZ (12-40-0-10S-1Zn) are specialty fertilizer products designed by Mosaic Company. The seed safety with S15 and MESZ is higher than that of MAP, due to its lower salt index. With a 10 per cent SBU and clay loam, adding 100lbs/ac of either product in the seed row with cereals would be no issue. However, those in drier sandier soils may want to limit to 75lbs or less. In a side band, you can easily apply up to 150lbs/ac of MESZ or S15 in good soil moisture conditions. Again, under drier and sandier conditions, you will want to reduce that number as well as work with an agronomist to ensure seed safety. For those producers looking to increase their phosphorus application, this may be a good option.