Measure off a driveway section 200" long and mark the ends with stakes or flags. A longer section will give more accurate results. Remove the plows and shanks from the front tool bars. Put your hopper on with no distributor ribbon. Get a clean bucket and tie under the discharge end of the distributor. Line up the tractor with the front wheel even with the first stop point. Set the distributor setting to 10. Lower the front lift enough to engage the distributor and drive to the second stop (exactly the same relative to the front wheel). Stop weigh the contents of the bucket and record the weight and the distributor setting on a tally sheet. Do the same for each setting on increments of 10 ie 20, 30, 40 etc. Drive the speed you plan to use to apply the Nitrogen in the field. For a 40" row spacing a 200" row is .01538 acres. Ammonium Nitrate is 33% actual N so you need to make that adjustment to get to the N to be applied. On the tally sheet make the following calculations: dial setting wt lbs/.0153 = lbs/ac x .33 = N/acre 10 3* 196 64 20 5* 326 108 30 etc *this was an example only, you will have to do your own weights. The more accurate your measurements the more accurate you calibrations.
Once you have an application rate both higher and lower than you plan to use you can use straight line interpolation to estimate the exact setting you need. Run the course on the planned setting and verify that you have it correct since the rate may not change on a straight line between settings. Understand that the SA-140 type distribution units were used extensively in Tobacco production and the Fertilizers used tended to be low analysis like 3-9-9 or 4-12-12 and large application rates were needed on the order of 800 pounds per acre or more. To get 100 pounds of N to the acre you will be applying 300 pounds of Ammonium-Nitrate a relatively low application rate. Your drive units may be too fast to make such a small application rate. If you double the size of the drive chain cog on the distributor you half the application rate and you may have use a larger cog on the distributor to apply Ammonium-Nitrate. Your other fertilizers will not flow exactly the same as pelleted N so this procedure may be necessary for each type. The final verification comes when you work a know acreage with a specific distributor setting. This same basic procedure can be used for seed count per acre or pesticide application rate.
My email is open so if you get the distributor settings and weight tallied send them to me and I can help you with the calculations. larry
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