Snake oil sales: or what are farm supplies doing selling foliar applied fertilizer

I was leaning on a counter at my local farm supply when another customer began praising our trusted manager on his recomendation to spray his entire 2000 acres of cereals with foliar applied fertilizer. The product was a market gardening blend dissolved into water and applied with his herbicides. The result would be minute amount of fertilizer on the crop and $5 dollars an acre changing hands.

Our manager holds a degree in agriculture and is actively promoting this product to his customers (neigbour and friend and relatives)