Yetter 2968 fertilizer applicators

We have run the Yetter 2968 dual fertilizer with the mini knife. We are 100% no-till. We have air bags for down pressure. When the ground gets hard it is at max down pressure and still in the red. We switched the notched disk for smooth disk and that helped. Run a total of 11 gallon 28% and 1 gallon of thisol. Best popcorn we have ever had in 30 plus years. Stands better and yields better.