Winter Wheat Fertilizer Program Comparisons

Experiment Info

Planted: 9/24
Variety: Red Devil
Population: 1.85 million
Row Spacing: 7.5″
Previous Crop: Navy Beans
Plot Size: 15′ x 265′
Replications: 4
Liquid BC: 4/5
Topdress: 7/16

Soil Test Values (ppm)

pH: 6.7
CEC: 12.4
% OM: 2.8
Bray P1: 15
K: 132
S: 6
% K: 2.7
% Mg: 21.2
% Ca: 75.9
% H: 0
% Na: 0.2
Zn: 1.2
Mn: 5
B: 0.5
Yield Goal: 100 bu
Fertilizer Rate:


To compare fertilizer program rates and sources for winter wheat.

Fall applied fertilizer programs have been researched for a number of years at the NCRS. Comparisons of a soil test program to a basic program of Pro-Germinator and Micro 500 have been tested the last 5 years to determine the importance of following a soil test. In this year’s experiment , a soil test program of 8.5 gal/A Pro-Germinator, 1 gal/A Sure-K, 2 qt/A Micro 500 and 2 gal/A access was compared to 4.25 gal/A Pro-Germinator with 2 qt/A Micro 500. These programs were also compared to a conventional fertilizer program of 10-34-0, ATS, Manganese and Zinc. Yield results appear on the chart below.

Winter Wheat Fertilizer Program ComparisonsConclusions:

  • All fertilizer treatments increased wheat yield over the nitrogen only treatment.
  • Although the soil test program did have a higher yield than the other fertilizer programs, it was not statistically significant. Similar treatments have been evaluated in the past at the NCRS with a 2 bu average yield advantage to the soil test program. In all cases, the additional fertilizer costs were not covered by the yield increase.
  • The addition of access to the fertilizer program did not influence yield.
  • The conventional program yielded similar to the other fertilizer programs.