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UNL Grazing Corn Residue Research

Many stalks in Nebraska are left ungrazed for various reasons.  One reason I’ve heard is the potential impact of increased compaction and reduced yield of the next crop.  Nebraska Extension has long-term research addressing this concern…in fact, 16 years of research conducted at the Ag Research and Development Center near Mead.  There’s various components to this study and you can view the full report at: http://go.unl.edu/8mp6.

In this study, cattle were allowed to graze corn residue in the spring (February to mid-April) or the fall (November through January) and these treatments were compared to an area not grazed.  Corn and soybeans were planted the spring after grazing the residue for 16 years to determine the effect of grazing on the subsequent crop yield.

In the fall grazing treatments, the corn and soybeans were planted no-till.  For corn or soybeans planted into the spring grazing treatments, three tillage treatments were also implemented for nine years:  no-till, ridge-till, and spring conventional till, after which all treatments were converted to no-till.  This result of the tillage by spring grazing treatments for either corn or soybean yield over nine years showed no interaction and suggested the same effect on yield regardless of tillage treatment used after spring grazing.

Table1-Beef

Effect of Corn Residue Removal on Subsequent Crop Yields“, 2015 Nebraska Beef Cattle Report. Mary E. Drewnoski, L. Aaron Stalker, Jim C. MacDonald, Galen E. Erickson, Kathy J. Hanford, Terry J. Klopfenstein

Spring grazing across all tillage treatments did increase soybean yields statistically (58.5 bu/ac for spring grazed vs. 57.0 bu/ac for ungrazed) and had no effect on corn yields.  The results were similar looking at 16 years of grazing vs. not grazing under no-till for both corn and soybeans in the spring; there was no yield effect found for corn and the soybeans showed a slight yield increase with grazing.

Table2-Beef

Effect of Corn Residue Removal on Subsequent Crop Yields“, 2015 Nebraska Beef Cattle Report. Mary E. Drewnoski, L. Aaron Stalker, Jim C. MacDonald, Galen E. Erickson, Kathy J. Hanford, Terry J. Klopfenstein

Looking at a 10 year period of no-till management for both spring and fall grazed corn residue and subsequent corn and soybean crops, fall grazing statistically improved soybean yields over both spring grazing and no grazing (65.5 bu/ac vs. 63.5 bu/ac and 62.1 bu/ac respectively).  No grazing effects were observed on corn yields in either season.  All statistics were at the 95% confidence level meaning the researchers were 95% confident any yield differences were due to the treatments themselves vs. random chance.

Regarding compaction, in the fall, the field was typically frozen and the researchers felt any mud and compaction associated with grazing cattle was minimized; highest subsequent soybean yields were achieved with fall grazing.  The spring treatment was designed to look more at potential compaction and muddy conditions after spring thaw till right before planting-thus the implementation of different tillage treatments as well.  They used a stocking rate consistent with UNL grazing recommendations resulting in removal of half the husks and leaves produced (8 lbs of leaf and husk per bushel of corn grain produced).  Results of this study indicate that even with muddy conditions in the spring, grazing increased subsequent soybean yields compared to not grazing regardless of tillage system used and that corn yields were not different between grazing vs. not grazing and regardless of tillage system used in the spring.  This study was conducted in Eastern Nebraska in a rainfed environment with yields ranging from 186-253 bu/ac with a 16 year median yield of 203 bu/ac.

Additional Grazing Study

A five year fall grazing study (December through January) was conducted in an irrigated continuous no-till corn field at Brule, NE to determine the effect of corn residue removal via baling corn residue or fall grazing on subsequent corn yields.  That environment receives limited rainfall and residue is deemed important for reducing evaporation of soil moisture in addition for catching/keeping snow on fields.  Farmers were questioning the effects of any residue removal on subsequent corn yields and the study was implemented.

Treatments were 1) fall grazing at 1 animal unit month/acre (AUM), 2) fall grazing 2 AUM/ac, 3) baled, or 4) ungrazed.  The researchers found that residue removal did not affect corn grain yields from 2009-2013 in the continuous corn rotation.  There were no statistical yield differences with 5 year average yields of:  152 bu/ac, 155 bu/ac, 147 bu/ac and 148 bu/ac respectively for the above-mentioned treatments.

Table3-Beef

Effect of Corn Residue Removal on Subsequent Crop Yields“, 2015 Nebraska Beef Cattle Report. Mary E. Drewnoski, L. Aaron Stalker, Jim C. MacDonald, Galen E. Erickson, Kathy J. Hanford, Terry J. Klopfenstein

Celebrating 100 years – Cooperative Extension

Cooperative Extension is celebrating 100 years in 2014! We will be celebrating throughout Nebraska in 2014, but in the meantime, check out our YouTube video!

Youth Discover Crop Science

An excellent opportunity for youth to become detectives and have fun while learning about crops and science! Consider having a youth you know attend this Big Red Camp and learn more about agriculture careers!  There are also scholarships available to attend!

Views from VanDeWalle

Are you interested in science, agriculture, plants, crops, insects, or diseases? If so, join our team of detectives to solve crop-related problems in the Crop Science Investigation (CSI) Big Red Camp! Become a detective while participating in hands-on sessions to learn about and increase your knowledge of crops, science, and agricultural careers. Youth detectives will interact with agronomic professionals across Nebraska to solve experiments in: nutrient management; managing disease, insect and weed problems; water management; crop production, and much more! Do you have what it takes to become a CSI detective?

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There are a variety of careers related to plant sciences such as:Agricultural Communicator; Agronomist; Crop Consultant; Crop Insurance Adjuster; Educator; Co-op Manager; Farmer or Rancher; Farm Credit Banker; Field or Lab Researcher; Plant Breeder; Soil or Water Conservationist; Seed, Fertilizer, or Chemical Sales; or Technical Representative.

Scholarships are available in the amount of $300 to participants who…

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Wordless Wednesday: On-Farm Research

Crop Science Investigation Camp

This is the first year we are doing a Crop Science Investigation (CSI) Big Red Camp for youth! We’d encourage any youth who enjoy plants, science, and agriculture who are 15-18 years old and who are interested in having fun learning about these topics to check this out! Big Red Camps are open to youth in any State. Please help spread the word!

Views from VanDeWalle

Are you interested in science, agriculture, plants, crops, insects, or diseases? If so, join our team of detectives to solve crop-related problems in the Crop Science Investigation (CSI) Big Red Camp! Become a detective while participating in hands-on sessions to learn about and increase your knowledge of crops, science, and agricultural careers. Youth detectives will interact with agronomic professionals across Nebraska to solve experiments in: nutrient management; managing disease, insect and weed problems; water management; crop production, and much more! Do you have what it takes to become a CSI detective?

There are a variety of careers related to plant sciences such as: Agricultural Communicator; Agronomist; Crop Consultant; Crop Insurance Adjuster; Educator; Co-op Manager; Farmer or Rancher; Farm Credit Banker; Field or Lab Researcher; Plant Breeder; Soil or Water Conservationist; Seed, Fertilizer, or Chemical Sales; or Technical Representative.

Scholarships are available in the amount of $300 to participants…

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