We only do custom app so most of our customers go with 100 lbs up front in many combinations then we will come in and top up to what they want. Most have  kept the same amount so in effect they have increased to the crop since they had no loss in the last 6 weeks. Once they try it they do more or all the next year. We use a MIller NTB with the Greenseeker.On our sandy soils it makes a huge difference.