High NRG-N Topdress Timing in Winter Wheat

Experiment Info

Planted: 10/11
Variety: Red Devil
Population: 2 million
Row Spacing: 7.5″
Previous Crop: Soybeans
Plot Size: 15′ x 532′
Replications: 2
Liquid BC: 4/3/13
Topdress: 7/15/13

 

Soil Test Values (ppm)

pH: 6.9
CEC: 9.1
% OM: 2.2
Bicarb P: 27
K: 63
S: 9
% K: 1.8
% Mg: 17.2
% Ca: 80.6
% H: 0
% Na: 0.4
Zn: 1.2
Mn: 8
B: 0.6
Yield Goal: 100 bu
Target
Fertilizer Rate:
120-0-74

Objective:

To evaluate the timing of High NRG-N topdress applications on soft red winter wheat yields.

A commonly asked question is will High NRG-N perform better if it is applied earlier than normal in a winter wheat topdress method of application? This question arises because of the unique N-release characteristics of High NRG-N. By using the normal application date of the first of April, there are still 90 days until the end of June to make use of all available nitrogen. This test was conducted to see if that timing of early April would meet the nitrogen needs of the winter wheat and also to acquire information if the early topdress timing would enhance yield. The yield results appear in the chart below.

High NRG-N Topdress Timing in Winter WheatConclusions:

  • The best time to topdress winter wheat is at dormancy break around early April in Michigan. This timing proved a significant yield advantage over an early or late application.
  • A delay in topdress application significantly lowered the yield below the early and normal application timing.
  • An early High NRG-N application did not prove to benefit wheat yield.

 

Topdress Nitrogen Source Comparison in Winter Wheat

Experiment Info

Planted: 9/26/2013
Harvest: 7/23/2014
Yield Goal: 100 bu/A
Target Fert: 120-43-84
Variety: Red Devil
Population: 2 million
Row Width: 7.5″
Prev. Crop: Navy Beans
Plot Size: 15×180/210/13
Replications: 5
Liquid BC: 9/26/2014
Topdress: 4/9/2014

 

Soil Test Values (ppm)

pH: 7.3
CEC: 6.9
%OM: 1.7
Bray P1: 29
Bicarb P: 11
K: 72
S: 9
%K: 2.7
%Mg: 17.6
%Ca: 78.8
%H: 0
Zn: 1.2
Mn: 4
B: 0.6

Objective:

To determine the best nitrogen source for topdressing winter wheat.

This experiment evaluated five nitrogen sources applied in the spring as a topdress application on winter wheat. Applications were applied at dormancy break in early April. Heavy rainfall occurred throughout April and into May, within one week of application. Additionally, a total of 6.4 inches of rain had fallen by the end of May. This, in combination of the light textured soils (CEC 6.9) increased the risk of nitrogen loss. Furthermore, the cool temperatures reduced wheat growth, leading to lower than expected yields. Yield results appear on the chart below.

Topdress NitrogenConclusions:

  • Excess rainfall in the spring following topdress may have increased the risk of nitrogen leaching leading to the lower yields. Except for urea, there was an apparent linear response between nitrogen rate and wheat yield.
  • The addition of micronutrients manganese and iron to an application of High NRG-N added over 2 bu/A to yield.
  • 28% with eNhance yielded similar to 28% while applying 8 less gallons per acre.

 

 

 

Nitrogen Source and Timing Comparison in Winter Wheat

Experiment Info

Planted: 9/26/2013
Harvest: 7/23/2014
Yield Goal: 120 bu/A
Target Fert: 144-121-63
Variety: Red Devil
Population: 2 million
Row Width: 7.5″
Prev. Crop: Navy Beans
Plot Size: 15 x 265
Replications: 4
Liquid BC: 9/26/2014
Topdress: 4/9/2014

 

Soil Test Values (ppm)

pH: 6.7
CEC: 17.2
%OM: 3
Bray P1: 16
Bicarb P:
K: 119
S: 12
%K: 1.8
%Mg: 20.2
%Ca: 77.6
%H: 0
Zn: 1.3
Mn: 3
B: 0.6

Objective:

To evaluate different nitrogen sources and their application timing on dryland winter wheat yields.

This experiment was designed to see if a small amount nitrogen fertilizer broadcast in the fall would help promote early fall growth and tillering to increase wheat yield. The target rate of nitrogen was 120 lbs/A. High NRG-N and 28% + eNhance were applied as topdress only applications for comparisons. The rate chosen for fall application was 4 gal/A broadcast sprayed after planting. The 4 gallons or equivalent pounds of nitrogen was subtracted from the total amount of recommended nitrogen and the remainder rate was applied in the spring as a topdress. Broadcast applications were made over the entire soil surface and topdress applications were made using stream nozzles to evenly place the nitrogen in bands 5″ apart across the soil surface. Topdress applications were applied on April 9th. Yield comparisons appear in the chart below.

Nitrogen Source and TimingConclusions:

  • High NRG-N did have a slight yield advantage when applied as a split application with 4 gal/A applied in the fall.
  • 28% + eNhance applied only as a topdress in the spring produced the highest yield in this comparison.
  • Further testing will continue to determine if different environmental conditions will change the outcomes.

 

 

 

Phosphorus Sources for Fall Winter Wheat Applications

Experiment Info

Planted: 9/26/2013
Harvest: 7/23/2014
Yield Goal: 120 bu/A
Target Fert: 144-121-63
Variety: Red Devil
Population: 2 million
Row Width: 7.5″
Prev. Crop: Navy Beans
Plot Size: 15 x 265
Replications: 4
Liquid BC: 9/26/2014
Topdress: 4/9/2014

 

Soil Test Values (ppm)

pH: 6.7
CEC: 17.2
%OM: 3
Bray P1: 16
Bicarb P:
K: 119
S: 12
%K: 1.8
%Mg: 20.2
%Ca: 77.6
%H: 0
Zn: 1.3
Mn: 3
B: 0.6

Objective:

A comparison of Pro-Germinator and 10-34-0 as a broadcast phosphorus application following wheat planting.

Getting a winter wheat crop off to a good start in the fall is necessary to help with over wintering and produce good tillering in the spring. Two applications were compared in this experiment: 5 gal/A of Pro-Germinator with Micro 500 and 15 gal/A of 10-34-0. Each treatment would provide 60 pounds of phosphate per acre. Although the soil test recommendation calls for much higher rates, past research has shown that the most economical rate is between 4 and 5 gal/A of Pro-Germinator. Fertilizers were applied following wheat planting before emergence. All treatments including the check were topdressed with 32 gal/A of 28% + eNhance in the spring. Yield results appear on the chart below.

Nitrogen SourceConclusions:

  • Both phosphorus sources, Pro-Germinator and 10-34-0, significantly increased wheat yield above the no phosphorus check.
  • There was no statistical difference between the Pro-Germinator and 10-34-0 applications. However a much lower rate was applied with Pro-Germinator, which would save fill-up time at planting.

Winter Wheat Fertilizer Methods of Application Options

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
Target
Fertilizer Rate:
120-113-15

Objective:

Comparison of phosphorus fertilizer method of application for effect on winter wheat yield.

How and where you place phosphorus fertilizer for wheat in not as critical as a corn crop. The combination of the seed and row spacing along with the root structure, allows greater flexibility in wheat and other small grains. In the Northern growing conditions of the NCRS there is not a lot of growth that takes place in the fall before the crop goes dormant. This experiment compares a preplant broadcast application, drill-applied, fall foliar application on 2” growth and a spring topdress treatment. The same fertilizer was applied at each timing and included 4.25 gal/A Pro-Germinator, 2 qt/A Micro 500 and 2 gal/A access. All treatments also received a spring topdress application of 28 gal/A High NGR-N. Yield results based on method of application appear on the chart below.

Winter Wheat Fertilizer Methods of Application OptionsConclusions:

  • As seen in past testing at the NCRS, there is no statically significant difference between the four methods of application.
  • With similar results seen amongst all treatments, growers have options on when they can apply their phosphorus in these northern climates. Areas with known low soil phosphorus levels where risk of deficiencies occur, apply nutrients in the fall in order to prevent stress to the crop.

Winter Wheat Fertilizer Methods of Application Options (3 Year Average)

Experiment Info 2011:

Planted: 10/13
Variety: Pioneer 25W43
Population: 2 million
Row Spacing: 7.5″
Previous Crop: Soybeans
Plot Size: 15′ x 290′
Replications: 4
Topdress: 4/13
Harvested: 7/15

 

Experiment Info 2012:

Planted: 10/11
Variety: Red Devil
Population: 2 million
Row Spacing: 7.5″
Previous Crop: Navy Beans
Plot Size: 15′ x 265′
Replications: 4
Topdress: 3/29
Harvested: 7/12

 

Experiment Info 2013:

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
Topdress: 4/5
Harvested: 7/16

Objective:

Long-term comparison of the methods of application on wheat yield.

Three years of testing at the NCRS has shown consistent results when it comes to method of application options for winter wheat. For comparison: preplant broadcast, drill applied, fall foliar on 2” growth and spring topdress were evaluated. Soils at the NCRS are in the mid to high levels for phosphorus, so limited inputs are required. This combined with the shortened fall growing season before dormancy provides more options for timing. Fertilizer programs and three year averages appear on the chart below.

Winter Wheat Fertilizer Methods of Application Options 3 Year AverageConclusions:

  • For three years in a row, the NCRS has shown there is little difference between placement options on winter wheat.
  • Areas with more fall growing time and requirements of more phosphorus, it may be necessary to have nutrients on sooner to provide best yield results.

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
Target
Fertilizer Rate:
120-113-15

Objective:

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.

Winter Wheat Topdress Nitrogen Comparison

Experiment Info

Planted: 10/11/11
Variety: Red Devil
Population: 2 million
Row Spacing: drill
Previous Crop: navy beans
Plot Size: 15′ x 265′
Replications: 4
PRE: 10/11
Topdress: 3/29
Harvested: 7/2

 

Soil Test Values (ppm)

pH: 6.9
CEC: 9.5
% OM: 2.1
Bray P1: 10
K: 112
S: 7
% K: 3.0
% Mg: 19.5
% Ca: 77.2
% H: 0
% Na: 0.3
Zn: 1.5
Mn: 10
B: 0.5
Yield Goal: 100 bu
Target
Fertilizer Rate:
120-133-27

Objective:

To evaluate three different nitrogen topdress options in winter wheat.

This dryland winter wheat experiment compared three different nitrogen sources applied topdress in early spring. High NRG-N and an experimental product N-10 were applied at 28 gal/A providing an equivalence of 120 pounds of nitrogen per acre. The third source, 28% UAN with eNhance was applied at 32 gal/A providing the same equivalence per acre. All treatments received 4 gal/A Pro-Germinator and 2 qt/A Micro 500 at planting. Topdress was done in late March on wheat in Feekes 5 growth stage. Yield results appear on the chart below.

Winter Wheat Nitrogen Program ComparisonConclusions:

  • All three nitrogen sources produced similar yields.
  • The experimental product, N-10 produced a yield that was slightly higher than that of High NRG-N and shows promise for the future.
  • As shown in past research 28% + eNhance was the highest yielding treatment for wheat topdress applications.

Research Field Days 2015