In 2007, a field study was conducted by Purdue University in Indiana

to evaluate the performance of Wolf Trax Mn DDP in soybeans. Standard

grower practices were also included for comparison purposes. The results

of this study demonstrate that Mn DDP applied with starter fertilizer or as an in-season

foliar application increased soybean yield as compared to the control treatment plots

and plots that received starter fertilizer only.

BACKGROUNDManganese (Mn) deficiency is prevalent in soybeans grown

in several areas in North America. Often soil-applied Mn

alone is ineffective at correcting Mn deficiency because

chemical and biological reactions in the soil render Mn

unavailable. Foliar applications of Mn can be effective at

correcting Mn, but glyphosate has been shown to reduce

Mn availability when tank-mixed or sprayed within 7 days

of Mn application. Therefore, combinations of enhanced

soil-applied and foliar applications of Mn DDP may offer

a solution to Mn deficiency in soybeans.

ISSUE 7: 2016

Wolf Trax Mn DDP® Increases Soybean Yield

Wolf Trax DDP Nutrientsfeature three proprietarytechnologies that ensureeffective delivery of nutrition:

EvenCoatTM

Technology

Fertilizer coating technologyallows for blanket-likedistribution and more points ofinterception for young roots.

PlantActivTM

Formulation

Physically and chemicallydesigned – the Wolf Trax DDPparticle size is optimum forplant uptake.

FlexUseTM

Application

In fields with severe deficienciesor crops with high demand, DDP Nutrients can be appliedmultiple times in a season.

Wolf Trax Innovative Nutrients are unique, research-tested and field-proven micronutrient and secondary nutrientfertilizers. By making nutrients more accessible to plants when they are needed most, Wolf Trax products simplifynutrient management, boost crop performance and enhance the return on farmers’ fertilizer investment.

wolftrax.com

Starter only; July 5, 2007

Starter +Mn DDP +Foliar Mn DDP; July 5, 2007

Control - - - - - -

Starter 10-34-0 10 gal/ac - - - -

Starter + Mn DDP 10-34-0 10 gal/ac Mn DDP 8 oz/ac - -

Starter + Mn DDP 10-34-0 10 gal/ac Mn DDP 8 oz/ac Mn DDP 3 oz/acw/ foliar Mn DDP w/ glyphosate 1 qt. + 3.4 lbs AS/ac

Foliar Mn post Mn DDP 10 d 3 oz/acglyphosate post glyphosate 1 qt. + 3.4 lbs AS/ac

METHODSA field site was chosen that was known to result in Mn deficient soybeans at the Pinney Purdue Agricultural Center in

Porter County, Indiana. The soil series was a Sebewa clay loam with high soil P (30 ppm Bray-P), low soil Mn (12 ppm),

5.1% organic matter, pH of 6.5 and CEC of 22.3 meq/100 g. ‘Becks 31NRR’ soybeans were planted in 30” rows on May

10th at a plant density of 145,000 seeds/acre. Plots were 4 rows wide and 91 feet long. Each fertilizer treatment (Table 1)

was replicated six times in a randomized complete block design (Table 1). Grain yield was harvested from the center two

rows and yield was corrected to 13% moisture content. All data was analyzed by analysis of variance and treatment

comparisons were made with single-degree-of-freedom contrasts.

Control Starter Starter+Mn DDP

Starter+Mn DDP

+Foliar Mnw/ glyphosate

Foliar Mn10 d post

glyphosate

Gra

in Y

ield

(bu/

ac)

Thou

sand

Ker

nel W

eigh

t (g)

0

10

20

30

40

50

60

70

52.2

206 208 217 226 219

52.758.0

61.556.4

0

50

100

150

200

250

Thousand Kernel WeightP = 0.007

YieldP = 0.003

b ba

aa

Figure 1. Grain yield (bu/ac) and thousand kernel weight (g) of soybeans treated with Mn DDP.

The results of this study demonstrate that a soil application of Mn DDP with starter fertilizer is a beneficial

addition to current grower practices in soybeans that are prone to manganese deficiencies. While no further

benefit was observed when Mn DDP was also applied as a foliar application, under the conditions of this

study, both soil and foliar applications of Mn DDP were effective agronomic tools for satisfying the crops

requirement for manganese. Mn DDP offers growers flexible application options for the growing season.

SUMMARY

compassminerals.com | 9900 W. 109th St., Suite 100, Overland Park, KS 66210

Copyright © 2016, All Rights Reserved - Compass Minerals Manitoba Inc. Wolf Trax and Design, DDP, EvenCoat, PlantActiv and FlexUse are trademarks of Compass Minerals Manitoba Inc. Compass Minerals is the proud supplier of Wolf Trax Innovative Nutrients. Not all products are registered in all areas.Contact wolftrax@compassminerals.com for more information.

RESULTSGrain yield and seed weight were highly

correlated (r=0.97) and both parameters

were significantly increased by Mn DDP

soil-applied with a starter fertilizer; as a

foliar application; or as both application

methods combined (Figure 1). Starter

fertilizer without Mn DDP had no

significant effect on soybean yield or seed

weight (Figure 1). The combined

application of Mn DDP did not provide any

additional benefit over either treatment

alone (Figure 1).

Starter fertilizer with Mn DDP was applied at seeding, 2” below and 2” to the side of the seed row, and glyphosate was applied at the 4th true leaf stage in soybeans.

Table 1. Starter Fertilizer with Mn DDP

Treatment Starter Application Starter Mn DDP Application Foliar Application Name Fertilizer Rate Mn Rate Mn DDP Rate

b ba a a