Corn Fertilizer Use Efficiency Results and Discussion We knew right away that we had spent more on the efficiency products than we would be saving in fertilizer reduction, however the goal of the trial was efficiency. Our goal was to produce high yields with less fertilizer and be able to make up for some of the added expense. We were able to maintain similar yields to the check and there are several lessons that we will try to show you from this data. First, we were able to produce similar yields within 4.4 bpa of the GSP check with reductions of 10 and 15 percent of the strip-till fertilizer. In Figure 16, we compare the different treatments to the GSP. Of course it will be difficult to show a positive return when we are comparing the GSP to the GSP plus the additives. When we are adding an additional expense of $37.50 and $39.06 for the efficiency products nor was this the intention. However, when we added Extract and cut fertility by ten percent we saw a yield increase of 1.9 bpa with a net return of -$1.72/ac this gives us hope that this philosophy may be able to work with a positive ROI. We feel that more testing is needed in order to find the correct combination to reducing fertilizer inputs. It is our opinion that with the amount of phosphate cut from the system and all the reduced fertilizer treatments are within 4.4 bpa of the GSP check that we are heading down the correct path.
Fertilizer Use Efficiency Trials
GSP + 1 qt/ac Terramar + 2 qt/ac Blackmax22 + 2 gal/ac Altura
10% Reduction of GSP plus Terramar Blackmax22 + Altura
15% Reduction of GSP plus Terramar Blackmax22 + Altura
GSP + 2 Qt/ac Extract + 2qt/ac Blackmax22 + 2 gal/acAltura
10% reduction of GSP plus Extract Blackmax22 + Altura
15% reduction of GSP plus Extract Blackmax22 + Altura
Moisture Yield 15.0 Grain Price GSP Cost $/ac
Savings at % Reduction Product Cost $/ac Difference from Check
Figure 16. Fertilizer use efficiency trial data.
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