The FMC-75-HYD is polypropylene with a flow rate suited for 2x2, starter and in-furrow treatments. The FMC-150FSHYD and FMC-200SS-HYD are constructed of 316 stainless steel with higher flow capabilities for larger equipment. Variable-rate application is easily accomplished with a centrifugal pump and electronic controller to assure efficient use of costly inputs.