Due to rising fertilizer prices in the past 5 years would you buy a new fertilizer spreader that is precise on its application rate and spread? I know a lot of people on this site use permagreen and Z my issue with them is that how do you know your exact rate of application? I know you calibrate it the best you can. However, if apply $25000 or 2000 worth of fertilizer and you are off by 2 or 5 or 10% in calibration isnt that a lot of money to me it is. I have looked at the dry fertilizer spreaders that the Ag industry uses, a 2-ton to 6-ton models. (such as a tyler or willimar spreader) It has a chain bottom floor (technically called a flat wire belt) connected to a drive that runs off of the spreaders floatation wheels. This is used because it controls the speed of the chain, so if you speed up in ground speed the chain increases also. The only constant is the speed of the impeller/spreader wheel. The tractors pto must be operating at 540rpms or a constant so spread distribution is the same. The other adjustment is fertilizer door. If the door is opened 1 only so much fert can get by a 1 opening thus this regulates the pound per acre. You can also open the door wider to apply more. I am trying to condense this down into a 125-pound version that uses 2 DC motors that are regulated by a radar/ground speed sensor. Obviously I would have it all calibrated so all an operator has to do is look at the flow chart and open the gate/door for the fertilizer. The rest would be turn on the spreader and go. If you go 2mph or 10 mph the corect apount would be applied for the speed of the machine. Baring corrosion issues with wiring, the rest would be stainless would you buy it and what would you pay for accuracy? Or what other issues should this spreader address that other spreaders have shortfalls with? I am close to completion and calibration programming will begin and I would like other input.