Nitrogen Source Sidedress Comparison in Corn (13-1003)

Experiment Info13-1003

Planted: 5/9
Variety: DKC48-12
Population: 28,70
Row Spacing: 30”
Previous Crop: Corn
Plot Size: 15’ x 165’
Replications: 4
Sidedress: 6/15

Soil Test Values (ppm)

pH: 6.8
CEC: 11.2
% OM: 2.3
Bray P1: 25
K: 99
S: 14
% K: 2.3
% Mg: 21.9
% Ca: 75.1
%H: 0
% Na: 0.7
Zn: 0.9
Mn: 4
B: 0.6

Objective:

To compare different sources of nitrogen and additional additives on sidedressed corn yields. In a corn following soybean rotation, applying nitrogen as a sidedress application within 30 days after planting is an excellent method to supply this nutrient. Sidedress can also be a great time to apply additional nutrients that may be needed. Agro-Culture Liquid Fertilizer’s eNhance can amend UAN solutions allowing lower rates to be applied while still achieving equal yields to full rates. eNhance allows for more efficient use of the nitrogen being applied. S-Calate also works with UAN solutions to improve the stability. Both products along with a pre-plant application of ammonium sulfate (AMS) were added to different rates of 28% UAN to observe their effects on yield. The lower rates of 28% + the additional products were compared to a full rate of 28%. Results appear below.

Conclusions:

• Due to extremely dry growing conditions, yields were considerably lower than planned.

• The additional calcium from S-Calate provided nearly a 10 bu/A yield increase over the 28% UAN only treatment.

• Using a lower rate of 51 gal/A of 28% and adding eNhance resulted in a sizeable increase in yield over the high rate of 28%.

• The commonly used AMS did not result in a yield increase over the straight UAN application. This may again be due to the dry conditions.

• Additional nutrients, that contain sulfur or calcium, to urea-ammonium nitrate (UAN) forms of nitrogen can increase yields while reducing the amount of nitrogen being applied.

Corn Planter Applied Sulfur Fertilizer Options for Corn (13-716)

Experiment Info13-716

Planted: 5/3
Variety: DKC53-78
Population: 4
Row Spacing: 30”
Previous Crop: Soybeans
Plot Size: 15’ x 210’
Replications: 4
PRE: 5/4
Sidedress: 6/15
Harvested: 10/3

Soil Test Values (ppm)

pH: 7.6
CEC: 14.8
% OM: 3.7
Bicarb P: 5
K: 73
S: 7
% K: 1.3
% Mg: 21.7
% Ca: 76.8
%H: 0
% Na: 0.2
Zn: 0.8
Mn: 2
B: 0.5

Objective

To evaluated planter applied sulfur options in corn. Environmental air cleanup has greatly decreased the amount of free sulfur a corn crop receives each year. Because of this, growers should apply sulfur in order to research optimum yield. Agro-Culture Liquid Fertilizers has 3 sulfur options that can be used for planter applications. The first option is eNhance, which is 8.7% sulfur and also contains Manganese and Zinc. This product is safe for
in-furrow applications on corn up to 3 qt/A. The other two options are accesS (17% sulfur) and S-Calate (14% sulfur). Neither of these products are recommended for in-furrow applications, but are safe for a 2×2 application. The difference between the two has to do with the soil requirements for calcium. In soils that have lower calcium levels, use S-Calate, as it contains 1% calcium. This experiment compares an in-furrow fertilizer program with and without the addition of 2 qt/A eNhance and a 2×2 fertilizer program with and without the addition of 2 qt/A access. Yield results appear on the chart below.

Conclusions

• Both sulfur sources, eNhance and accesS, increased yield over the comparable no-sulfur treatment. However, the yield increase with eNhance was statistically significant.

• There was no yield difference observed between the same fertilizer program applied in-furrow or 2×2.

• Highest yield was reached with an in-furrow application of 2 qt/A eNhance, with a 10 bu/A yield increase over the no sulfur treatment.

• It should be noted that current recommendations of accesS is closer to 2 gal/A. However, this experiment applied equal rates of both products for evaluation.

Fertilizer Program Components in Corn (3 Year Average)

Experiment Info 20133 Year Average

Planted: 5/7
Variety: DKC53-78
Population: 4
Row Spacing: 30”
Previous Crop: Soybeans
Plot Size: 15’ x 210’
Replications: 4
Potash: Fall 2012
PPI: 5/2, 5/6
Sidedress: 63/8
Harvested: 10/15

Soil Test Values(ppm):

pH: 7
CEC: 12.4
% OM: 3.4
Bicarb P: 17
K: 111
S: 5
% K: 2.3
% Mg: 21.4
% Ca: 75.9
%H: 0
% Na: 0.4
Zn: 1.5
Mn: 4
B: 0.7

Objective

Evaluate the long-term yield effects of the different AgroLiquid program components. In the spring of 2011 a long-term study was developed to compare the influence of fertilizer components on overall fertilizer programs. A yield goal of 175 bu/A corn was established (However, actual corn yields have far exceeded the original goal.) Following a soil test, a recommendation of 180-30-60-2 Zn was developed. Three fertilizer treatments were developed
and compared to a nitrogen only treatment.

  1. 3 gal/A Pro-Germ. + 5 gal/A Sure-K + 2 qt/A Micro 500
  2. 5 gal/A Sure-K + 2 qt/A Micro 500
  3. 3 gal/A Pro-Germ. + 2 qt/A Micro 500

These treatments were applied in-furrow at planting and were all sidedressed with 47 gal/A 28% + eNhance. These treatments are part of the long-term “permanent” plot study, therefore all treatments remain in the same location from year to year. A summary of the first three years of yield results appear on the table below.

Conclusions

• All treatments including the nitrogen only, exceeded the 175 bu/A yield goal. The location of this experiment is a highly productive soil, knowing the yield potential, recommendations may have changed. However, this being a long term study, rates will remain the same to compare changes in yield and soil test based on fertilizer programs.

• Of the planter fertilizer treatments, lowest yield average is the program containing just Sure-K and Micro 500, yielding almost 7 bu/A less than the Pro-Germinator only treatment.

• The treatment with Pro-Germinator and Micro 500 has a three year average yield increase of over 15 bu/A. Even in these higher phosphorus soils, there is great benefit to Pro-Germinator and Micro 500 applied in-furrow.

• Highest yield was achieved with the complete fertilizer program with a three year yield average of 215 bu/A, this is over a 20 bu/A yield increase over the nitrogen only treatment. This demonstrates the importance of a complete fertilizer program and its effects on corn yield.

Long-Term Fertilizer Program Comparisons in Corn (13-715)

Experiment Info

13-715Planted: 5/7
Variety: DKC53-78
Population: 4
Row Spacing: 30”
Previous Crop: Soybeans
Plot Size: 15’ x 210’
Replications: 4
Potash: Fall 2012
PPI: 5/2, 5/6
Sidedress: 6/8
Harvested: 10/15
Yield Goal: 175 bu
Target Fertilizer Rate: 175-30-60

Soil Test Values (ppm)

pH: 7
CEC: 12.4
% OM: 3.4
Bicarb P: 17
K: 111
S: 5
% K: 2.3
% Mg: 21.4
% Ca: 75.9
%H: 0
% Na: 0.4
Zn: 1.5
Mn: 4
B: 0.7

Objective

Compare effects of an AgroLiquid corn fertilizer program that applies less than half the amount of nutrients per acre to two conventional fertilizer programs.AgroLiquid fertilizers are touted as having nutrient formulations that are more efficient and longer lasting in the soil than are comparable conventional fertilizers. Such enhancements enable application of nutrients at reduced rates since said nutrients are not lost or made unavailable to the crop. Three different corn fertilizer programs were developed based on soil test and applied to plots in an experiment that keeps the same fertilizer programs in the same plots in a corn-soybean rotation. The conventional treatments applied a program of 180-30-120 compared to 147-8.5-3.8 for AgroLiquid. (Note: the conventional treatments had 200 lb/A of potash applied in the previous fall after soybean harvest. This is a common practice in the area and is to provide K to the corn and following soybean crops.) This is the third year of this experiment, and the yields from 2013 are in the chart.

Conclusions

• All of the treatments increased yield over that of the nitrogen only treatment. This was the reduced rate of nitrogen used in the AgroLiquid treatment, applying 141 lb of N per acre.

• The AgroLiquid treatment produced the highest average yield compared the two conventional treatments that applied over twice the amount of nutrients per acre.

• In addition to higher yield, the in-furrow AgroLiquid treatment is easier to apply.

In-Furrow Planter Fertilizer Source Comparisons in Dryland Corn (13-711)

Experiment Info

13-711Planted: 5/3
Variety: DKC53-78
Population: 34,000
Row Spacing: 30”
Previous Crop: Soybeans
Plot Size: 15’ x 255’
Replications: 4
Sidedress: 6/15
Harvested: 10/22
Yield Goal: 175 bu
Target Fertilizer Rate: 192-50-91

Soil Test Values (ppm)

pH: 7.3
CEC: 18.9
% OM: 4.3
Bicarb P: 16
K: 110
S: 13
% K: 1.5
% Mg: 19.4
% Ca: 78.7
%H: 0
% Na: 0.4
Zn: 1.2
Mn: 3
B: 0.7

Objective

To compare planter applied fertilizer source effects on corn yield.Each year more in-furrow fertilizer options are available, many of these are balanced products containing N, P, K and in some cases micronutrients. Carefully planned recommendations need to be conducted when comparing AgroLiquid products to these products. In order to make fair comparisons, use of the full AgroLiquid line should be utilized. This experiment compared four products: Trupointe, Season Pass (6-18-6), Nachurs G24 (6-24-6) and 3-20-15 to a combination of Pro-Germinator and Sure-K. All products were applied at 5 gal/A with in-furrow tubes. Due to the low soil test potassium levels, 7 gal/A Sure-K was applied sidedress with 45 gal/A High NRG-N to all treatments. Yield results appear on the chart below.

Conclusions

• Better yield was obtained with the Pro-Germinator and Sure-K treatment, similar yield was achieved with all other in-furrow fertilizer products.

• One of AgroLiquid’s biggest advantages is the provision of a program to meet soil test needs and address almost every nutrient to help attain highest yield. Using a combination of Pro-Germinator and Sure-K can help, AgroLiquid Nutrition compare to these other inflexible products.

• Highest yield at 192 bu/A was reached with 2.5 gal/A Pro-Germinator and 2.5 gal/A Sure-K.

Broadcast Nitrogen Source Comparisons in Corn (13-710)

Experiment Info

13-710Planted: 5/3
Variety: DKC53-78
Population: 37,000
Row Spacing: 30”
Previous Crop: Soybeans
Plot Size: 15’ x 255’
Replications: 4
PRE: 5/4
Urea: 5/7
Harvested: 10/23
Yield Goal: 175 bu
Target Fertilizer Rate: 192-70-70

Soil Test Values (ppm)

pH: 6.5
CEC: 14.2
% OM: 2.5
Bray P1: 14
K: 109
S: 11
% K: 2.0
% Mg: 18.5
% Ca: 71.4
%H: 7.6
% Na: 0.5
Zn: 1.0
Mn: 4
B: 0.4

Objective

To evaluate the effectiveness of different nitrogen sources applied broadcast on corn. This experiment compared pre emergence broadcast applications of different nitrogen solutions in a corn crop. Applications were made the day following planting. All sources were applied at the recommended rate to provide 192 lbs of equivalent nitrogen per acre for a yield goal on 175 bu/A. AgroLiquid products were High NRG-N, 28% + eNhance, 28% + accesS, a combination of High NRG-N and 28% + eNhance and an experimental product NF-13. These products were compared to conventional products 28% and ESN urea. Yields appear on the chart above.

Conclusions

• All nitrogen solutions nearly reached the yield goal and greatly increased yield over the no nitrogen treatment.

• Highest yield was achieved with the full rate of 28% with the addition of eNhance, yielding 193 bu/A which was significantly higher than the same rate of 28% UAN without eNhance.

• The addition of 6 gal of access to 28% added 5 bu /A to the overall yield.

• Nitrogen sources that applied less actual nitrogen per acre, reached yield goal, but were not able to provide additional yield than the higher nitrogen rates.

Potassium Fertilizer Timing in Corn (13-705)

Experiment Info

13-705Planted: 5/7
Variety: DKC53-78
Population: 31,500
Row Spacing: 30”
Previous Crop: Corn
Plot Size: 15’ x 265’
Replications: 4
Potash: 11/9/12
PRE: 5/8
Sidedress: 6/8
Harvested: 10/15
Yield Goal: 175 bu
Target Fertilizer Rate: 192-90-48

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

Objective

To determine the optimum time for fertilizing a corn crop with potassium. Agro-Culture Liquid Fertilizer’s Sure-K is seed safe to allow application of the required nutrients in-furrow when planting. Sometimes the question of when to apply potassium, if not with the planter, comes up. In determining to answer that question, a broadcast rate of Sure-K was applied in the fall. A comparison of fall broadcasted Potash was also applied. Both treatments were incorporated into the soil by chisel plowing the previous corn crop residue. The spring broadcast treatment of Sure-K was made and incorporated with a soil finisher before planting. Yield results appear in the table above.

Conclusions

• The 4 gal/A rate of Sure-K gave nearly identical yields as the higher rate of Sure-K broadcasted or the dry Potash applications. The in-furrow placement puts nutrients where they are needed.

• Planter applied, fall or spring broadcast of potassium had no significant yield advantage to each other. The difference comes in the amount of nutrients applied to realize similar yields.

• In spite of these results, broadcast applications are not recommended at this time until more research is conducted.

• The no planter fertilizer treatment lacked the necessary nutrients needed to accomplish its yield potential.

• If Sure-K is going to be broadcast applied, a 20% increase in rate is needed to achieve comparable yields to planter applied rates.